CN103321297B - Construction method of cantilever steel structure - Google Patents
Construction method of cantilever steel structure Download PDFInfo
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- CN103321297B CN103321297B CN201310271175.1A CN201310271175A CN103321297B CN 103321297 B CN103321297 B CN 103321297B CN 201310271175 A CN201310271175 A CN 201310271175A CN 103321297 B CN103321297 B CN 103321297B
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Abstract
The invention discloses a cantilever steel structure and a construction method thereof. The construction method of the cantilever steel structure includes bearing weight of a whole cantilever structure by the aid of a steel structure 2-storey in height and three bearing surface layers; arranging a transfer truss 2-storey in height between 5-7 layers, namely bearing vertical loads of 5-11 layers above cantilever truss transition layers by the cantilever truss transition layers; dividing the transfer truss into three spans, wherein an end span supports loads of storeys above the same by arranging diagonal columns on the end portion of a truss, an intermediate span supports the loads of the storeys above the same by arranging two rows of stand columns (eight) on the truss, namely a span stand column A and a span stand column B support loads above the span stand column A and the span stand column B . By the adoption of the transfer truss, the problem of ventilation and lighting can be well solved. A trussed transfer structure has definite force transfer and force transferring paths, so that more convenience can be brought to punching and pipeline arrangement in construction.
Description
Technical field
The present invention relates to building to encorbelment construction, i.e. overhanging steel structure and overhanging steel structure construction method thereof.
Background technology
Highrise building is from structure stress and the requirement for anti-seismic performance, and the bearing capacity and stiffness of high building structure should reduce from bottom to top gradually, and bearing capacity is wanted evenly, consecutive variations, and do not have sudden change.But putting into practice in engineering often due to the needs on the using function of building, there will be some vertical irregular buildings.These buildings because lateral resisting structure is vertically arranged improper or adopted suspension, cantilevered structure etc., and then make the anti-seismic performance of structure greatly reduce.
In order to increase the resistance to overturning of cantilevered structure, promoting overall anti-seismic performance, from design angle, being optimized the force-bearing situation of cantilevered structure, the present invention needs to arrange one more reasonably force way.
Summary of the invention
The overhanging steel structure that the object of the present invention is to provide a kind of multi-line stressed and overhanging steel structure construction method thereof.
Implementation of the present invention is as follows: overhanging steel structure, comprise the steel structure vertically entering ground and build main post, also comprise upper strata plane rack, middle level plane rack, lower floor's plane rack stacks gradually the cantilever frame conversion layer of formation, upper strata plane rack, middle level plane rack, lower floor's plane rack all connects steel structure and builds main post, also comprise successively through upper strata plane rack, middle level plane rack, the root on lower floor's plane rack access ground is across column, cantilever frame conversion layer is divided into 2 intervals across column by root, root across column and steel build build between main post for root across, root across column away from steel build build main post side for encorbelment outward across, also comprise successively through upper strata plane rack, middle level plane rack, then end face and lower floor's plane rack access across column A with across column B, across column B across column A and root across column between, across column A and root across being middle span between column, across column A away from root across the side of column be end across, across column A and across between column B for transition across, across column B and root across between column for reinforce across
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In order to set up stressed circuit, the present invention using root across as main load-bearing district, its root is integrated across with steel structure building body, root is across the part that can be considered steel structure building body, namely, extend district of encorbelmenting in the present invention to be connected across with steel structure building body by root, and by root across stressed, the pressure in the district that disperses to encorbelment is on steel structure building body.Upper strata plane rack, middle level plane rack, lower floor's plane rack be corresponding aspect, the aspect of the 6th layer, the aspect of the 5th layer of the 7th layer of building when constructing respectively, namely the present invention arrange in the region of the 5th layer to the 7th layer high outer of 2 floors encorbelment across with cantilever frame conversion layer, utilize cantilever frame conversion layer power to be disperseed.In the horizontal direction, there is upper strata plane rack, middle level plane rack, lower floor's plane rack as stressed circuit, exist across column A at vertical direction and build across column B and steel and build main post and root across the stressed circuit of column as vertical direction.2 stressed circuits can be set up like this.The stressed of trans-regional vertical direction of encorbelmenting outward guides by across column A with across column B.
Iff according to said structure, cantilevered structure is set, then its power of bearing is also less, if the overhang layer above cantilever frame conversion layer is less, then need not increase other stressed circuit, if the overhang layer above cantilever frame conversion layer is more, then also need the stressed circuit increasing other.General conventional method is by arranging that at root of encorbelmenting beam upper prop and diagonal brace can reduce encorbelment span and transmit vertical load, will arranging a lot of beam upper prop and diagonal brace like this, and then increase difficulty of construction and construction costs.Therefore, in order to improve cantilevered structure efficiency of construction, reduce arrange diagonal brace quantity and on building using function impact and set up many load path.The present invention also comprises the diagonal brace connector be arranged on upper strata plane rack, middle level plane rack, lower floor's plane rack, respectively from be positioned at reinforce across with root across middle level plane rack on diagonal brace connector respectively towards upper left, upper right, lower-left, lower right arrange diagonal brace and form X-shaped diagonal brace, X-shaped diagonal brace possesses 4 end points.
Further, also comprise the diagonal brace connector be arranged on upper strata plane rack, middle level plane rack, lower floor's plane rack, from be positioned at end across with transition across middle level plane rack on diagonal brace connector arrange diagonal brace form monocline support; End across monocline support be connected with the diagonal brace connector of lower floor plane rack away from across one end of column A, end across monocline be supported by and be closely connected with the diagonal brace connector of upper strata plane rack across one end of column A; Transition across monocline support be connected with the diagonal brace connector of lower floor plane rack away from across one end of column A, transition across monocline be supported by and be closely connected with the diagonal brace connector of upper strata plane rack across one end of column A.
The present invention increases X-shaped diagonal brace and monocline support, according to encorbelmenting trans-regional distance and determining outward, in order to reduce outer trans-regional weight of encorbelmenting own, the region that distance steel structure building body is far away, employing steel work that should be as far as possible few, namely transition across with end across when setting up the stressed circuit of oblique pull, employing monocline supports, such steel using amount can reduce as far as possible, and the weight in this region also reduces accordingly simultaneously, avoids like this at the trans-regional steel diagonal brace that increases of root to support unnecessary weight more.For this reason, the present invention just adopts transition to draw stressed circuit across with end across setting up monocline, and reinforce across with root across as main stress area, its pressure born is maximum, therefore, reinforce and set up 2 stressed circuits of diagonal brace, to strengthen its structural strength across with root across employing X-shaped diagonal brace.According to above-mentioned design, steel using amount can be reduced, the engineering time shortens, and it has good structural strength simultaneously.
Further, due to end across the stressed of end points place can not effectively be disperseed, in order to ensure the stability of structure, the present invention also comprises end across cross-brace, end is positioned at end across away from the one end across column A across cross-brace, end is connected with the end of upper strata plane rack, the end of middle level plane rack, the end of lower floor's plane rack successively across cross-brace, and end is across the axis of cross-brace and be acute angle across the angle between column A axis.The present invention utilizes end, across cross-brace, end bridging is connected into an entirety, increases a stressed circuit.The overhang layer of top is made to utilize end, across cross-brace, its weight is distributed to cantilever frame conversion layer.
Also be provided with the overhang layer that multiple layer plane rack-layer folds formation above the plane rack of upper strata, side and the steel of overhang layer build to be built main post and is connected, and overhang layer builds the one end of building main post away from steel and is connected across cross-brace with end.The height of overhang layer is generally 7 layers to 11 layers.
In order to ensure structural strength, preferably, below lower floor's plane rack and root trans-regional in be provided with dispersion bottom, dispersion bottom be provided with X-shaped diagonal brace.
Overhanging steel structure construction method: comprise following construction sequence:
Step 1: set up root across, build at steel and build main post, away from the side of steel structure building body, the root of ground connection is set across column, root across column and steel to build the region of building between main post be root across;
Step 2: set up root across cantilever frame conversion layer, root trans-regional interior utilize truss conversion layer layer steel column and be located at adjacent truss change crossbeam post layer by layer between steel column and form three plane racks layer by layer, three layer by layer plane rack be respectively: upper strata plane rack, middle level plane rack, lower floor's plane rack, upper strata plane rack is cantilever frame conversion layer to lower floor's plane rack, and being positioned at the trans-regional cantilever frame conversion layer of root is that root is across cantilever frame conversion layer;
Step 3: set up grounded bracket, to build away from steel across column at root on the ground, side of building main post and set up grounded bracket, grounded bracket is set up to the lower floor plane rack bottom surface trans-regional with root flushes;
Step 4: set up outer encorbelment across, rely on the supporting role of grounded bracket, grounded bracket is laid truss conversion layer layer steel column and is located at adjacent truss and change crossbeam post layer by layer between steel column and X-shaped layer connector, be positioned at the truss conversion layer layer steel column on grounded bracket, crossbeam post and X-shaped layer connector form outer encorbelment across lower floor's plane rack, encorbelment outward across lower floor's plane rack and root across lower floor's plane rack flush and dock, encorbelment outside across lower floor's plane rack on arrange across column A with across column B, across column B across column A and root across column between, be middle span across column A and root across the region between column, across column A away from the region across column B side be end across, end across with middle span form outer encorbelment across,
Step 5: set up outer encorbelment across cantilever frame conversion layer, rely on across column A, across column B and encorbelment outward across the support of lower floor's plane rack, encorbelment outside across lower floor's plane rack above lay upper strata plane rack and middle level plane rack, upper strata plane rack and middle level plane rack are all primarily of truss conversion layer layer steel column and be located at adjacent truss and change crossbeam post layer by layer between steel column and form, and outer encorbelment across upper strata plane rack and root across upper strata plane rack flush and dock, and encorbelment outward across middle level plane rack and root across middle level plane rack flush and dock;
Step 6: set up the stressed circuit of diagonal brace, across column A and across between column B for transition across, across column B and root across between column for reinforce across; Respectively from be positioned at reinforce across with root across middle level plane rack on diagonal brace connector respectively towards upper left, upper right, lower-left, lower right arrange diagonal brace and form X-shaped diagonal brace, X-shaped diagonal brace possesses 4 end points; From be positioned at end across with transition across middle level plane rack on diagonal brace connector arrange diagonal brace form monocline support; End across monocline support be connected with the diagonal brace connector of lower floor plane rack away from across one end of column A, end across monocline be supported by and be closely connected with the diagonal brace connector of upper strata plane rack across one end of column A; Transition across monocline support be connected with the diagonal brace connector of lower floor plane rack away from across one end of column A, transition across monocline be supported by and be closely connected with the diagonal brace connector of upper strata plane rack across one end of column A;
Step 7: set up end across cross-brace, across away from the one end across column A, end is set across cross-brace in end, end is connected with the end of the end of upper strata plane rack, the end lower floor plane rack of middle level plane rack successively across cross-brace, and end is across the axis of cross-brace and be acute angle across the angle between column A axis;
Overhanging steel structure construction method, in step 2, during the setting up of lower floor's plane rack in root is trans-regional, adjacent truss change layer by layer between steel column also erection have X-shaped layer connector.
Overhanging steel structure construction method, also comprise and set up overhang layer step, the overhang layer that multiple layer plane rack-layer folds formation is also provided with above the plane rack of upper strata, overhang layer is primarily of truss conversion layer layer steel column and be located at adjacent truss and change crossbeam post layer by layer between steel column and form, and overhang layer one end and steel build to be built main post and be connected.
Overhang layer builds the one end of building main post away from steel and is connected across cross-brace with end.
Highrise building is from structure stress and the requirement for anti-seismic performance, and the bearing capacity and stiffness of high building structure should reduce from bottom to top gradually, and bearing capacity is wanted evenly, consecutive variations, and do not have sudden change.But putting into practice in engineering often due to the needs on the using function of building, there will be some vertical irregular buildings.These buildings because lateral resisting structure is vertically arranged improper or adopted suspension, cantilevered structure etc., and then make the anti-seismic performance of structure greatly reduce.
In order to increase the resistance to overturning of cantilevered structure, promoting overall anti-seismic performance, from design angle, the force-bearing situation of cantilevered structure being optimized, one more reasonably force way is set.
But just relate to the problem that structure encorbelments in the architectural design of invention, if having more than 5 layers 26.7m encorbelment span structure on adopt successively overhanging tupe of encorbelmenting, a lot of beam upper prop and diagonal brace will be set, and then increase difficulty of construction and construction costs.Therefore, in order to improve cantilevered structure efficiency, reduce arrange diagonal brace quantity and on building using function impact and set up many load path, on the basis of this theory, have employed in design and arrange the high transfer truss of 2 floors between 5 ~ 7 layers, namely cantilever frame conversion layer bears the vertical load of on it 5 ~ 11 layers.Adopt transfer truss divide into 3 across, wherein, end is across the load supporting floor on it by arranging end at truss end across cross-brace, and middle span by arranging 2 rows (8) column, namely across column A and the load supporting floor on it across column B on truss.And, in order to ensure that the internal force of component can effectively be transmitted, also transfer truss is extended in steel structure building body in design one across, namely root across, and root across diagonal brace continue to arrange to its lower floor.
In addition, in order to the distance of encorbelmenting to reduce cantilever truss, conveniently set up Article 2, Article 3 load path is target, encorbelment between 4 ~ 5 layers root span on be also provided with the steel pipe diagonal brace of 4 Φ 650, also the steel pipe diagonal brace of one group of Φ 600 is provided with, i.e. above-mentioned X-shaped diagonal brace and monocline support 5 ~ 7 layers of same position.
The invention has the advantages that: resistance to overturning, overall anti-seismic performance is all better, and the construction period is short, and steel using amount is few, and cost is low.
Accompanying drawing explanation
Fig. 1 is the lateral view of overhanging steel structure of the present invention.
Fig. 2 be overhanging steel structure set up outer encorbelment across time lateral view.
Stereogram when Fig. 3 is setting up of overhanging steel structure lower floor plane rack.
Load across column A and the stereogram across column B when Fig. 4 is setting up of lower floor's plane rack.
Reference numeral in figure is: 1, root across, 2, middle span, 3, end across, 4, overhang layer, 5, cantilever frame conversion layer, 6, dispersion bottom, 7, grounded bracket, 8, truss conversion layer layer steel column, 31, end across cross-brace, 11, root is across column, 12, steel builds and builds main post, and 13, X-shaped diagonal brace, 10, monocline support, 21, across column A, 22, across column B, 71, play cushion device, 81, diagonal brace connector, 82, crossbeam post, 83, X-shaped layer connector.51, upper strata plane rack, 52, middle level plane rack, 53, lower floor's plane rack.
Detailed description of the invention
Embodiment 1
As Figure 1-Figure 4.
Overhanging steel structure, comprise the steel structure vertically entering ground and build main post 12, also comprise upper strata plane rack 51, middle level plane rack 52, lower floor's plane rack 53 stacks gradually the cantilever frame conversion layer 5 of formation, upper strata plane rack 51, middle level plane rack 52, lower floor's plane rack 53 all connects steel structure and builds main post 12, also comprise successively through upper strata plane rack 51, middle level plane rack 52, lower floor's plane rack 53 accesses the root on ground across column 11, cantilever frame conversion layer 5 is divided into 2 intervals across column 11 by root, root builds across column 11 and steel and builds between main post 12 as root is across 1, root across column 11 away from steel build build main post 12 side for encorbelment outward across, also comprise successively through upper strata plane rack 51, middle level plane rack 52, then end face and lower floor's plane rack 53 access across column A21 with across column B22, across column B22 across column A21 and root across column 11 between, across column A21 and root across being middle span 2, be that end across 3 away from root across the side of column 11 across column A21 between column 11, across column A21 and across between column B22 for transition across, across column B22 and root across between column 11 for reinforce across
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In order to set up stressed circuit, the present invention using root across 1 as main load-bearing district, its root is integrated with steel structure building body across 1, root can be considered a part for steel structure building body across 1, namely, extend district of encorbelmenting in the present invention to be connected with steel structure building body across 1 by root, and by root across 1 stressed, the pressure in the district that disperses to encorbelment is on steel structure building body.Upper strata plane rack 51, middle level plane rack 52, lower floor's plane rack 53 be corresponding aspect, the aspect of the 6th layer, the aspect of the 5th layer of the 7th layer of building when constructing respectively, namely the present invention arrange in the region of the 5th layer to the 7th layer high outer of 2 floors encorbelment across with cantilever frame conversion layer, utilize cantilever frame conversion layer power to be disperseed.In the horizontal direction, there is upper strata plane rack 51, middle level plane rack 52, lower floor's plane rack 53 as stressed circuit, exist across column A21 at vertical direction and build across column B22 and steel and build main post 12 and root across the stressed circuit of column 11 as vertical direction.2 stressed circuits can be set up like this.The stressed of trans-regional vertical direction of encorbelmenting outward guides by across column A21 with across column B22.
Iff according to said structure, cantilevered structure is set, then its power of bearing is also less, if the overhang layer above cantilever frame conversion layer 5 is less, then need not increase other stressed circuit, if the overhang layer above cantilever frame conversion layer 5 is more, then also need the stressed circuit increasing other.General conventional method is by arranging that at root of encorbelmenting beam upper prop and diagonal brace can reduce encorbelment span and transmit vertical load, will arranging a lot of beam upper prop and diagonal brace like this, and then increase difficulty of construction and construction costs.Therefore, in order to improve cantilevered structure efficiency of construction, reduce arrange diagonal brace quantity and on building using function impact and set up many load path.The present invention also comprises the diagonal brace connector 81 be arranged on upper strata plane rack 51, middle level plane rack 52, lower floor's plane rack 53, respectively from be positioned at reinforce across with root across middle level plane rack 52 on diagonal brace connector 81s respectively towards upper left, upper right, lower-left, lower right arrange diagonal brace and form X-shaped diagonal brace 13, X-shaped diagonal brace 13 possesses 4 end points.
Further, also comprise the diagonal brace connector 81 be arranged on upper strata plane rack 51, middle level plane rack 52, lower floor's plane rack 53, from be positioned at end across 3 and transition across middle level plane rack 52 on diagonal brace connector 81s arrange diagonal brace form monocline support 10; End is connected with the diagonal brace connector 81 of lower floor plane rack 53 away from the one end across column A21 across the monocline support 10 of 3, and end to be closely connected with the diagonal brace connector 81 of upper strata plane rack 51 across one end of column A21 across the monocline support 10 of 3; Transition across monocline support 10 be connected with the diagonal brace connector 81 of lower floor plane rack 53 away from the one end across column A21, transition across monocline support 10 to be closely connected with the diagonal brace connector 81 of upper strata plane rack 51 across one end of column A21.
The present invention increases X-shaped diagonal brace 13 and monocline support, according to encorbelmenting trans-regional distance and determining outward, in order to reduce outer trans-regional weight of encorbelmenting own, the region that distance steel structure building body is far away, employing steel work that should be as far as possible few, namely transition is across when setting up the stressed circuit of oblique pull with end across 3, employing monocline supports, such steel using amount can reduce as far as possible, and the weight in this region also reduces accordingly simultaneously, avoids like this at the trans-regional steel diagonal brace that increases of root to support unnecessary weight more.For this reason, the present invention just adopts transition to draw stressed circuit across setting up monocline with end across 3, and reinforce across with root across as main stress area, its pressure born is maximum, therefore, reinforce and set up 2 stressed circuits of diagonal brace, to strengthen its structural strength across with root across employing X-shaped diagonal brace 13.According to above-mentioned design, can be less by steel using amount, the engineering time shortens, and it has good structural strength simultaneously.
Further, due to end across 3 the stressed of end points place can not effectively be disperseed, in order to ensure the stability of structure, the present invention also comprises end across cross-brace 31, end is positioned at end across 3 away from the one end across column A21 across cross-brace 31, end is connected with the end of the end of upper strata plane rack 51, the end lower floor plane rack 53 of middle level plane rack 52 successively across cross-brace 31, and end is across the axis of cross-brace 31 and be acute angle across the angle between column A21 axis.The present invention utilizes end, across cross-brace 31, end is connected into an entirety across 3, increases a stressed circuit.The overhang layer 4 of top is made to utilize end, across cross-brace 31, its weight is distributed to cantilever frame conversion layer 5.
Also be provided with the overhang layer 4 that multiple layer plane rack-layer folds formation above upper strata plane rack 51, side and the steel of overhang layer 4 build to be built main post 12 and is connected, and overhang layer 4 builds the one end of building main post 12 away from steel and is connected across cross-brace 31 with end.The height of overhang layer 4 is generally 7 layers to 11 layers.
In order to ensure structural strength, preferably, below lower floor's plane rack 53 and root is provided with dispersion bottom across in 1 region, dispersion bottom is provided with X-shaped diagonal brace 13.
Overhanging steel structure construction method: comprise following construction sequence:
Step 1: set up root across 1, build at steel and build main post 12 and arrange the root of ground connection across column 11 away from the side of steel structure building body, it is that root is across 1 that root builds the region of building between main post 12 across column 11 and steel;
Step 2: set up root across cantilever frame conversion layer, three plane racks are layer by layer formed across utilizing truss conversion layer layer steel column 8 in 1 region and being located at the adjacent truss crossbeam post 82 changed layer by layer between steel column 8 at root, three layer by layer plane rack be respectively: upper strata plane rack 51, middle level plane rack 52, lower floor's plane rack 53, upper strata plane rack 51 to lower floor plane rack 53 is cantilever frame conversion layer 5, is positioned at the trans-regional cantilever frame conversion layer of root 5 for root is across cantilever frame conversion layer;
Step 3: set up grounded bracket, to build away from steel across column 11 at root on the ground, side of building main post 12 and sets up grounded bracket 7, and grounded bracket 7 is set up to flushing across lower floor's plane rack 53 bottom surface in 1 region with root;
Step 4: set up outer encorbelment across, rely on the supporting role of grounded bracket 7, grounded bracket 7 is laid truss conversion layer layer steel column 8 and is located at adjacent truss and change crossbeam post 82 layer by layer between steel column 8 and X-shaped layer connector 83, be positioned at the truss conversion layer layer steel column 8 on grounded bracket 7, crossbeam post 82 and X-shaped layer connector 83 form outer encorbelment across lower floor's plane rack, encorbelment outward across lower floor's plane rack and root across lower floor's plane rack 53 flush and dock, encorbelment outside across lower floor's plane rack on arrange across column A21 with across column B22, across column B22 across column A21 and root across column between, be middle span 2 across column A21 and root across the region between column, be that end is across 3 across column A21 away from the region across column B22 side, end across 3 with middle span 2 form outer encorbelment across, truss conversion layer layer steel column 8, crossbeam post 82 and X-shaped layer connector 83 form lower floor's plane rack 53 and ensure its structural strength, the pressure that bears of lower floor's plane rack 53 is maximum in the present invention, therefore to ensure the intensity of its structure, compare other floors, also need to arrange X-shaped layer connector 83.
After grounded bracket 7 has set up, at grounded bracket 7 upper surface, cushion device 71 has been set, then can utilize cushion device by encorbelment outward across lower floor plane rack hold up, convenient adjustment is outer encorbelment across lower floor's plane rack and root across lower floor's plane rack 53 registration process, a general cushion device 71 is jack.
Step 5: set up outer encorbelment across cantilever frame conversion layer, rely on across column A21, across column B22 and encorbelment outward across the support of lower floor's plane rack, encorbelment outside across lower floor's plane rack above lay upper strata plane rack 51 and middle level plane rack 52, upper strata plane rack 51 and middle level plane rack 52 are all primarily of truss conversion layer layer steel column 8 and be located at the crossbeam post 82 that adjacent truss changes layer by layer between steel column 8 and form, and outer encorbelment across upper strata plane rack 51 and root across upper strata plane rack 51 flush and dock, and outer encorbelment across middle level plane rack 52 and root across middle level plane rack 52 flush and dock,
Step 6: set up the stressed circuit of diagonal brace, across column A21 and across between column B22 for transition across, across column B22 and root across between column 11 for reinforce across; Respectively from be positioned at reinforce across with root across middle level plane rack 52 on diagonal brace connector 81s respectively towards upper left, upper right, lower-left, lower right arrange diagonal brace and form X-shaped diagonal brace 13, X-shaped diagonal brace 13 possesses 4 end points; From be positioned at end across 3 and transition across middle level plane rack 52 on diagonal brace connector 81s arrange diagonal brace form monocline support 10; End is connected with the diagonal brace connector 81 of lower floor plane rack 53 away from the one end across column A21 across the monocline support 10 of 3, and end to be closely connected with the diagonal brace connector 81 of upper strata plane rack 51 across one end of column A21 across the monocline support 10 of 3; Transition across monocline support 10 be connected with the diagonal brace connector 81 of lower floor plane rack 53 away from the one end across column A21, transition across monocline support 10 to be closely connected with the diagonal brace connector 81 of upper strata plane rack 51 across one end of column A21;
Step 7: set up end across cross-brace 31, away from the one end across column A21, end is set across cross-brace 31 across 3 in end, end is connected with the end of the end of upper strata plane rack 51, the end lower floor plane rack 53 of middle level plane rack 52 successively across cross-brace 31, and end is across the axis of cross-brace 31 and be acute angle across the angle between column A21 axis;
Overhanging steel structure construction method, in step 2, when root is across the setting up of the lower floor's plane rack 53 in 1 region, adjacent truss change layer by layer between steel column 8 also erection have X-shaped layer connector 83.
Overhanging steel structure construction method, also comprise and set up overhang layer 4 step, the overhang layer 4 that multiple layer plane rack-layer folds formation is also provided with above upper strata plane rack 51, overhang layer 4 is primarily of truss conversion layer layer steel column 8 and be located at the crossbeam post 82 that adjacent truss changes layer by layer between steel column 8 and form, and overhang layer 4 one end and steel build to be built main post 12 and be connected.
Overhang layer 4 builds the one end of building main post 12 away from steel and is connected across cross-brace 31 with end.
Highrise building is from structure stress and the requirement for anti-seismic performance, and the bearing capacity and stiffness of high building structure should reduce from bottom to top gradually, and bearing capacity is wanted evenly, consecutive variations, and do not have sudden change.But putting into practice in engineering often due to the needs on the using function of building, there will be some vertical irregular buildings.These buildings because lateral resisting structure is vertically arranged improper or adopted suspension, cantilevered structure etc., and then make the anti-seismic performance of structure greatly reduce.
In order to increase the resistance to overturning of cantilevered structure, promoting overall anti-seismic performance, from design angle, the force-bearing situation of cantilevered structure being optimized, one more reasonably force way is set.
But just relate to the problem that structure encorbelments in the architectural design of invention, if having more than 5 layers 26.7m encorbelment span structure on adopt successively overhanging tupe of encorbelmenting, a lot of beam upper prop and diagonal brace will be set, and then increase difficulty of construction and construction costs.Therefore, in order to improve cantilevered structure efficiency, reduce arrange diagonal brace quantity and on building using function impact and set up many load path, on the basis of this theory, have employed in design and arrange the high transfer truss of 2 floors between 5 ~ 7 layers, namely cantilever frame conversion layer 5 bears the vertical load of on it 5 ~ 11 layers.Adopt transfer truss divide into 3 across, wherein, end is across the load supporting floor on it by arranging end at truss end across cross-brace, and middle span by arranging 2 rows (8) column, namely across column A and the load supporting floor on it across column B on truss.And, in order to ensure that the internal force of component can effectively be transmitted, also transfer truss is extended in steel structure building body in design one across, namely root across, and root across diagonal brace continue to arrange to its lower floor.
In addition, in order to the distance of encorbelmenting to reduce cantilever truss, conveniently set up Article 2, Article 3 load path is target, encorbelment between 4 ~ 5 layers root span on be also provided with the steel pipe diagonal brace of 4 Φ 650, also the steel pipe diagonal brace of one group of Φ 600 is provided with, i.e. above-mentioned X-shaped diagonal brace and monocline support 5 ~ 7 layers of same position.
The present invention is equivalent to arrange suspension building at the external wall of main building structure, utilizes the high steel work of 2 floors and three layers of stress surface to bear the weight of whole cantilevered structure.Compare traditional cantilevered structure, the present invention is carrying out dispersion treatment after power being concentrated, and traditional cantilevered structure adopts is dispersion treatment successively, and the overall weight of whole cantilevered structure is inevitable heavier, the difficulty of therefore constructing and all higher with steel cost.Compare the present invention, the present invention only needs the structural strength of the cantilever frame conversion layer that consideration 2 floor is high, and during construction, the construction being only cantilever frame conversion layer is comparatively complicated, when the load of cantilever frame conversion layer reaches the requirement of design, all the other floors all can traditionally set up without the floor of cantilevered structure, and therefore construct very simple, cost is also lower.In addition, the present invention only needs the stressed circuit considering cantilever frame conversion layer, and concentrated arranges multiple stressed circuit at cantilever frame conversion layer, can reach the structural strength of expection, compare the complexity of the stressed circuit of traditional cantilevered structure, the present invention has very high superiority.
Adopt this truss-like conversion layer to form cantilever frame conversion layer in the present invention, the needs on building functions can be met on the one hand, in addition, adopt transfer truss can solve the problem of ventilation and lighting preferably.And the power transmission of truss-like transformational structure, Path of Force Transfer are clear and definite, this structure make in construction punch and install pipeline more convenient, and the gap of truss conversion layer can adopt light building material to fill, and is conducive to the deadweight alleviating steel work, anti-seismic performance is also better.
As above then the present invention can be realized preferably.
Claims (4)
1. overhanging steel structure construction method: it is characterized in that: comprise following construction sequence:
Step 1: set up root across (1), build at steel and build main post (12) and arrange the root of ground connection across column (11) away from the side of steel structure building body, it is that root is across (1) that root builds the region of building between main post (12) across column (11) and steel;
Step 2: set up root across cantilever frame conversion layer, change crossbeam post (82) layer by layer between steel column (8) at root form three plane racks layer by layer across utilizing truss conversion layer layer steel column (8) in (1) region and being located at adjacent truss, three layer by layer plane rack be respectively: upper strata plane rack (51), middle level plane rack (52), lower floor's plane rack (53), upper strata plane rack (51) is cantilever frame conversion layer (5) to lower floor's plane rack (53), is positioned at the trans-regional cantilever frame conversion layer (5) of root for root is across cantilever frame conversion layer;
Step 3: set up grounded bracket, to build away from steel across column (11) at root on the ground, side of building main post (12) and set up grounded bracket (7), grounded bracket (7) is set up to flushing across lower floor's plane rack (53) bottom surface in (1) region with root;
Step 4: set up outer encorbelment across, rely on the supporting role of grounded bracket (7), grounded bracket (7) upper lay truss conversion layer layer steel column (8) and be located at adjacent truss change crossbeam post (82) layer by layer between steel column (8) and X-shaped layer connector (83), be positioned at the truss conversion layer layer steel column (8) on grounded bracket (7), crossbeam post (82) and X-shaped layer connector (83) form outer encorbelment across lower floor's plane rack, encorbelment outward across lower floor's plane rack and root across lower floor's plane rack (53) flush and dock, encorbelment outside across lower floor's plane rack on arrange across column A(21) and across column B(22), across column B(22) be positioned at across column A(21) and root across between column, across column A(21) and root be middle span (2) across the region between column, across column A(21) away from across column B(22) region of side is that end is across (3), end across (3) and middle span (2) forms encorbelment outward across,
Step 5: set up outer encorbelment across cantilever frame conversion layer, rely on across column A(21), across column B(22) and encorbelment outward across the support of lower floor's plane rack, encorbelment outside across lower floor's plane rack above lay upper strata plane rack (51) and middle level plane rack (52), upper strata plane rack (51) and middle level plane rack (52) are all primarily of truss conversion layer layer steel column (8) and be located at adjacent truss and change crossbeam post (82) layer by layer between steel column (8) and form, and outer encorbelment across upper strata plane rack (51) and root across upper strata plane rack (51) flush and dock, and outer encorbelment across middle level plane rack (52) and root across middle level plane rack (52) flush and dock,
Step 6: set up the stressed circuit of diagonal brace, across column A(21) and across column B(22) between for transition across, across column B(22) with root across between column (11) be reinforce across; Respectively from be positioned at reinforce across with root across middle level plane rack (52) on diagonal brace connector (81)s respectively towards upper left, upper right, lower-left, lower right arrange diagonal brace and form X-shaped diagonal brace (13), X-shaped diagonal brace (13) possesses 4 end points; From be positioned at end across (3) and transition across middle level plane rack (52) on diagonal brace connector (81)s arranged diagonal brace and form monocline support (10); (10) are supportted away from across column A(21 across the monocline of (3) in end) one end be connected with the diagonal brace connector (81) of lower floor's plane rack (53), (10) are supportted near across column A(21 across the monocline of (3) in end) one end be connected with the diagonal brace connector (81) of upper strata plane rack (51); Transition across monocline support (10) away from across column A(21) one end is connected with the diagonal brace connector (81) of lower floor's plane rack (53), transition across monocline support (10) close across column A(21) one end be connected with the diagonal brace connector (81) of upper strata plane rack (51);
Step 7: set up end across cross-brace (31), in end across (3) away from across column A(21) one end end is set across cross-brace (31), end is connected with the end of the end of upper strata plane rack (51), end lower floor plane rack (53) of middle level plane rack (52) successively across cross-brace (31), and end is across the axis of cross-brace (31) and across column A(21) angle between axis is acute angle.
2. overhanging steel structure construction method according to claim 1: it is characterized in that: in step 2, when root is across the setting up of the lower floor's plane rack (53) in (1) region, adjacent truss change layer by layer between steel column (8) also erection have X-shaped layer connector (83).
3. overhanging steel structure construction method according to claim 1 and 2: it is characterized in that: also comprise and set up overhang layer (4) step, the overhang layer (4) that multiple layer plane rack-layer folds formation is also provided with in upper strata plane rack (51) top, overhang layer (4) is primarily of truss conversion layer layer steel column (8) and be located at adjacent truss and change crossbeam post (82) layer by layer between steel column (8) and form, and overhang layer (4) one end and steel build to be built main post (12) and be connected.
4. overhanging steel structure construction method according to claim 3: it is characterized in that: overhang layer (4) builds the one end of building main post (12) away from steel and is connected across cross-brace (31) with end.
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| CN103790229B (en) * | 2014-01-29 | 2016-06-22 | 中国航空规划设计研究总院有限公司 | A kind of multilayer cantilever steel construction and constructive method thereof |
| CN109372097B (en) * | 2018-08-20 | 2023-10-20 | 筑友智造智能科技有限公司 | Assembled concrete truss building structure |
| CN109281390B (en) * | 2018-08-20 | 2023-10-20 | 筑友智造智能科技有限公司 | Assembled concrete truss shear wall building structure |
| CN110863672A (en) * | 2019-11-28 | 2020-03-06 | 湖南麓上住宅工业科技有限公司 | Overhanging high-rise wood structure building |
| CN115559414A (en) * | 2022-09-27 | 2023-01-03 | 中铁广州工程局集团有限公司 | Construction method of cantilever steel truss on top layer of building |
| CN115627957B (en) * | 2022-12-01 | 2023-03-21 | 北京市第三建筑工程有限公司 | Connecting piece of original outer frame column and new outer frame column during building adduction and transformation and A-shaped column thereof |
| CN115559556B (en) * | 2022-12-01 | 2023-03-21 | 北京市第三建筑工程有限公司 | Butt joint construction method of A-shaped column and newly-added inclined outer frame column during super high-rise building transformation |
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