CN104727563A - Sliding installation method for large span section steel beam - Google Patents
Sliding installation method for large span section steel beam Download PDFInfo
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- CN104727563A CN104727563A CN201510130148.1A CN201510130148A CN104727563A CN 104727563 A CN104727563 A CN 104727563A CN 201510130148 A CN201510130148 A CN 201510130148A CN 104727563 A CN104727563 A CN 104727563A
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Abstract
The invention provides a sliding installation method for a large span section steel beam. The sliding installation method comprises the steps that two sliding rails are installed on the two sides of the section steel beam to be installed and positioned respectively; rail ribs are arranged on the sliding rails; base plates arranged on the rail ribs and used for bearing the section steel beam are arranged in the sliding rails; the section steel beam arranged on the base plates is arranged on the two sliding rails in a span mode; turning supports and pulleys arranged on the turning seats are installed at the ends of one sides of the sliding rails; winches used for driving the section steel beam to slide are arranged, and steel wire ropes of the winches penetrate through the pulleys and then are tensioned to the base plates along the sliding rails; according to the installing and positioning points of the section steel beam, the section steel beam is slide in place through the winches. By means of the design of the turning supports and the pulleys, the steel wire ropes of the winches can be turned, the transverse and longitudinal space is fully used, and the difficulty that construction cannot be carried out due to the insufficient longitudinal sliding length of a roof is overcome.
Description
Technical field
The present invention relates to technical field of building construction, refer in particular to a kind of slide installation method of large span section steel beam.
Background technology
The buildings such as the theater of current China, cultural center and stadiums all adopt large span spatial structure, different modeling, bear enough weight to reach floor structure, its horizontal girder needed need adopt heavy in section section steel beam to improve span ability and the load level of its entirety.Traditional gliding method many employings cluster jack is applied to the two ends of beam body, incremental launching construction by multipoint jacking slippage, there is the defects such as difficulty is large, the synchronism control amount of devoting oneself to work is large, single step slippage stroke is short, inefficiency, and need just can construct in larger place, have higher requirement to the width in place.
Summary of the invention
Because the problems referred to above, the object of the present invention is to provide a kind of slide installation method that can carry out a kind of large span section steel beam of constructing in the inadequate place of the straight skidding length of roofing.
In order to achieve the above object, the invention provides a kind of slide installation method of large span section steel beam, comprising:
The both sides of the section steel beam in location to be installed install a sliding rail respectively;
Described sliding rail arranges track muscle;
In described sliding rail, cloth to be arranged on described track muscle, for the backing plate of section steel beam described in support;
Across the described section steel beam be arranged on described backing plate on two described sliding rails;
At the pulley that the end of described sliding rail side is installed turning support and is located on described turning support;
Hoist engine for driving described section steel beam slippage is set, by after pulley described in the steel wire penetrating of described hoist engine again along described sliding rail stretch-draw in described backing plate;
According to the installation anchor point of described section steel beam, by described hoist engine, described section steel beam slippage is put in place.
The slide installation method of a kind of large span section steel beam of the present invention, by the design of turning support and pulley, the wire rope of hoist engine can be made to turn to, take full advantage of laterally with longitudinal space, solve the difficulty that the straight skidding length due to roofing cannot be constructed not.And, the sliding system adopting track muscle and hoist engine jointly to form carries out slippage to large span section steel beam and installs to locate and construct, track muscle coordinates with hoist engine, there is labour-saving feature, reduce the difficulty of construction, at short notice smooth for section steel beam slippage can be put in place and fall beam again to permanent position, there is speed of application fast, the advantages such as slippage stroke is long, and construction operation is continuous.
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, at the pulley that the end of described sliding rail side is installed turning support and is located on described turning support, comprising:
Formation concrete foundation is built in the position of described turning support to be installed;
Described concrete foundation installs steel plate support;
At the sidepiece of described steel plate support, the otic placode offering earhole is set;
Described pulley is arranged on described earhole by suspension hook.
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, arranges the otic placode offering earhole, comprising at the sidepiece of described steel plate support:
Calculate the distance of center circle of thickness needed for described otic placode and described earhole from the hole back gauge needed for described otic placode edge;
Thickness needed for the described otic placode calculated and the distance of center circle of described earhole, from the hole back gauge needed for described otic placode edge, make described otic placode;
Described otic placode is welded on described steel plate support.
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, calculates the thickness needed for described otic placode, comprising:
Utilize formula
calculate the counter-force F that described pulley causes described otic placode, wherein, T ' is power during described wire rope actual slip;
By the diameter D of described suspension hook
gwith the diameter D of described earhole self
rbe set to D
r<D
g;
Utilize formula σ
s=F/tD
g, obtain the local compressive stress σ of described otic placode
swith the mathematic(al) representation of the thickness t needed for described otic placode;
According to the local compressive stress σ of described otic placode
sbe not more than the compressive strength f of described otic placode self
s, utilize formula σ
s≤ f
s, calculate the thickness needed for described otic placode
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, the distance of center circle calculating described earhole, from the hole back gauge needed for described otic placode edge, comprising:
Utilize formula V=0.5F, calculate the shear V of described suspension hook in the thickness range of described otic placode;
Utilize formula A
n=bt, obtains the projected area A of described suspension hook in the thickness range of described otic placode
nwith the distance of center circle of the described earhole mathematic(al) representation from the hole back gauge b needed for described otic placode edge;
Utilize formula τ=1.5V/A
n, obtain the mathematic(al) representation of the distance of center circle running through shearing stress τ and described earhole from the hole back gauge b needed for described otic placode edge of described otic placode;
The shear strength f that shearing stress τ is not more than described otic placode self is run through according to described otic placode
v, utilize formula τ≤f
v, calculate the distance of center circle of described earhole from the hole back gauge needed for described otic placode edge
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, described sliding rail arranges track muscle, comprise: calculate the diameter needed for track muscle for described section steel beam slippage, corresponding track muscle is set on described sliding rail according to result of calculation.
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, calculates the diameter needed for track muscle for described section steel beam slippage, comprising:
By needing the quantity of the track muscle be arranged on a described sliding rail to be designated as N, the weight of described section steel beam being designated as G, the weight of described backing plate is designated as g;
Utilize formula Q=(0.5G+g)/N, calculate the pressure Q that a track muscle is subject to;
Utilize formula A=dL, obtain the mathematic(al) representation of the diameter d of the projected area A of a track muscle in the length range of described backing plate and described track muscle, wherein, L is the length of described backing plate;
Utilize formula σ=Q/A, obtain the mathematic(al) representation of the action intensity σ that is subject in the projected area of a track muscle in the length range of described backing plate and the diameter d needed for track muscle;
Be not more than the compressive strength f of track muscle self according to the action intensity σ be subject in the projected area of a track muscle in the length range of described backing plate, utilize formula σ≤f, calculate diameter d >=(the 0.5G+g)/NfL needed for track muscle.
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, by after pulley described in the steel wire penetrating of described hoist engine again along described sliding rail stretch-draw in described backing plate, comprise: the diameter needed for wire rope calculating described hoist engine, according to result of calculation by after pulley described in the steel wire penetrating of the correspondence of described hoist engine again along described sliding rail stretch-draw in described backing plate.
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, calculates the diameter needed for wire rope of described hoist engine, comprising:
The weight of described section steel beam is designated as G, the weight of described backing plate is designated as g;
Utilize formula Q '=(0.5G+g), the gross pressure Q ' that the whole described track muscle calculating a described sliding rail is subject to;
Utilize formula T=μ Q ', calculate the minimum elevator power T of described hoist engine, wherein, μ is the coefficient of sliding friction under described section steel beam and described track muscle contact conditions;
Utilize formula σ
e=T/ (π D
e 2/ 4) the stress σ that the wire rope, obtaining described hoist engine is subject to
ewith the diameter D needed for described wire rope
emathematic(al) representation;
According to the stress σ that the wire rope of described hoist engine is subject to
ebe not more than the tensile strength f of described wire rope self
t, utilize formula σ
e≤ f
t, calculate the diameter D needed for described wire rope
e>=[4 μ (0.5G+g)]/π f
t.
The further improvement of the slide installation method of a kind of large span of the present invention section steel beam is, when arranging described track muscle, at described track muscle surface coating butter, forms sliding layer.
Accompanying drawing explanation
Fig. 1 is the flow chart of the slide installation method of a kind of large span section steel beam of the present invention.
Fig. 2 is the construction plan of the slide installation method of a kind of large span section steel beam of the present invention.
Fig. 3 is the sectional drawing in A-A face in Fig. 2.
Fig. 4 is the structural representation of the turning support of the slide installation method of a kind of large span section steel beam of the present invention.
Fig. 5 is the front schematic view of the otic placode of the slide installation method of a kind of large span section steel beam of the present invention.
Fig. 6 is the side schematic view of the otic placode of the slide installation method of a kind of large span section steel beam of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1 ~ Fig. 4, Fig. 1 is the flow chart of the slide installation method of a kind of large span section steel beam of the present invention, Fig. 2 is the construction plan of the slide installation method of a kind of large span section steel beam of the present invention, Fig. 3 is the sectional drawing in A-A face in Fig. 2, and Fig. 4 is the structural representation of the turning support of the slide installation method of a kind of large span section steel beam of the present invention.Coordinate referring to shown in Fig. 1 ~ Fig. 4, the slide installation method of a kind of large span section steel beam of the present invention, comprising:
step S101:in the both sides of the section steel beam 10 of location to be installed, one sliding rail 20 is installed respectively.
step S102:sliding rail 20 arranges track muscle 30.Preferably, track muscle 30 is chosen round steel and at its surface coating butter, is formed sliding layer.
step S103:in sliding rail 20, cloth to be arranged on track muscle 30, for the backing plate 40 of supporting type girder steel 10.Preferably, sliding rail 20 both sides are along its length respectively equipped with limiting section 210, limiting section 210 sandwiched being positioned at sliding rail 20 both sides forms rail groove, and backing plate 40 is slidedly arranged on track muscle 30 in this rail groove, and limiting section 210 can prevent backing plate 40 from departing from sliding rail 20.
step S104:across the section steel beam 10 be arranged on backing plate 40 on two sliding rails 20.
step S105:at the pulley 70 that the end of sliding rail 20 side is installed turning support 60 and is located on turning support 60.
step S106:arrange and be used for the hoist engine 50 of driving girder steel 10 slippage, by after the steel wire penetrating pulley 70 of hoist engine 50 again along sliding rail 20 stretch-draw in backing plate 40.
step S107:according to the installation anchor point of section steel beam 10, by hoist engine 50, section steel beam 10 slippage is put in place.
Wherein, shown in composition graphs 4, turning support 60 comprises concrete foundation 610, is embedded in the pre-embedded steel slab 620 in concrete foundation 610, the steel plate support 630 be welded on pre-embedded steel slab 620 in advance, steel plate support 630 comprises vertical plate 631 and the tilt prop 632 be welded on vertical plate 631, the sidepiece of vertical plate 631 is welded with otic placode 640, otic placode 640 offers earhole 641, pulley 70 is arranged on the earhole 641 of otic placode 640 by suspension hook 710.Preferably, steel plate support 630 adopts i iron bearing.Especially, in the embodiment as shown in fig .4, bending 90 degree after the steel wire penetrating pulley 70 of hoist engine 50, then along sliding rail 20 stretch-draw on backing plate 40.The bending angle of wire rope also can be determined according to actual conditions.
Particularly, turning support 60 and the mounting method of pulley 70, comprising:
Step S1: build in the position of turning support 60 to be installed and form concrete foundation 610, when building, pre-embedded steel slab 620 is embedded in concrete foundation 610;
Step S2: vertical plate 631 and the tilt prop 632 of steel plate support 630 are welded on pre-embedded steel slab 620 respectively;
Step S3: at the sidepiece welding otic placode 640 of the vertical plate 631 of steel plate support 630;
Step S4: pulley 70 is arranged on the earhole 641 of otic placode 640 by suspension hook 710.
Further, refer to Fig. 5 and Fig. 6, Fig. 5 is the front schematic view of the otic placode of the slide installation method of a kind of large span section steel beam of the present invention, and Fig. 6 is the side schematic view of the otic placode of the slide installation method of a kind of large span section steel beam of the present invention.Composition graphs 5, with shown in Fig. 6, at the sidepiece welding otic placode 640 of the vertical plate 631 of steel plate support 630, comprising:
(1) thickness of otic placode 640 and the distance of center circle of the earhole 641 hole back gauge from otic placode 640 edge is calculated;
1.1 calculate the thickness needed for otic placode 640, comprising:
Utilize formula
calculate the counter-force F that pulley 70 pairs of otic placodes 640 cause, wherein, the power during wire rope actual slip that T ' is hoist engine 50;
By the diameter D of suspension hook 710
gwith the diameter D of earhole 641 self
rbe set to D
r<D
g;
Utilize formula σ
s=F/tD
g, calculate the local compressive stress σ of otic placode 640
s, wherein, the thickness of t needed for otic placode 640 to be calculated;
According to the local compressive stress σ of otic placode 640
sbe not more than the compressive strength f of otic placode 640 self
s, utilize formula σ
s≤ f
s, calculate the thickness needed for otic placode 640
1.2 calculate the distance of center circle of earhole 641 from the hole back gauge needed for otic placode 640 edge, comprising:
Utilize formula V=0.5F, calculate the shear V of suspension hook 710 in the thickness range of otic placode 640;
Utilize formula A
n=bt, calculates the projected area A of suspension hook 710 in the thickness range of otic placode 640
n, wherein, the distance of center circle that b is earhole 641 to be calculated is from the hole back gauge needed for otic placode 640 edge;
Utilize formula τ=1.5V/A
n, what calculate otic placode 640 runs through shearing stress τ;
The shear strength f that shearing stress τ is not more than otic placode 640 self is run through according to otic placode 640
v, utilize formula τ≤f
v, calculate the distance of center circle of earhole 641 from the hole back gauge needed for otic placode 640 edge
(2) thickness needed for the otic placode 640 calculated and the distance of center circle of earhole 641, from the hole back gauge needed for otic placode 640 edge, make otic placode 640;
(3) otic placode 640 is welded on the vertical plate 631 of steel plate support 630.
Further, the slide installation method of a kind of large span section steel beam of the present invention, sliding rail 20 arranges track muscle 30, comprising: calculate the diameter needed for track muscle 30 for section steel beam 10 slippage, corresponding track muscle 30 is set on sliding rail 20 according to result of calculation.
Particularly, calculate the diameter needed for track muscle 30 for section steel beam 10 slippage, comprising:
(1) by needing the quantity of the track muscle 30 be arranged on a sliding rail 20 to be designated as N, the weight of section steel beam 10 being designated as G, the weight of backing plate 40 is designated as g;
(2) utilize formula Q=(0.5G+g)/N, calculate the pressure Q that a track muscle 30 is subject to;
(3) utilize formula A=dL, calculate the projected area A of track muscle 30 in the length range of backing plate 40, wherein, d is the diameter of track muscle 30 to be calculated, and L is the length of backing plate 40;
(4) utilize formula σ=Q/A, calculate the action intensity σ be subject in the projected area of a track muscle 30 in the length range of backing plate 40;
(5) the compressive strength f of track muscle 30 self is not more than according to the action intensity σ be subject in the projected area of a track muscle 30 in the length range of backing plate 40, utilize formula σ≤f, the type selecting specification calculating the diameter d needed for track muscle 30 is: d >=(0.5G+g)/NfL.
Further, the slide installation method of a kind of large span section steel beam of the present invention, by after the steel wire penetrating pulley 70 of hoist engine 50 again along sliding rail 20 stretch-draw in backing plate 40, comprise: calculate the diameter needed for wire rope of hoist engine 50, according to result of calculation by after the steel wire penetrating pulley 70 of the correspondence of hoist engine 50 again along sliding rail 20 stretch-draw in backing plate 40.
Particularly, calculate the diameter needed for wire rope of hoist engine 50, comprising:
(1) weight of section steel beam 10 is designated as G, the weight of backing plate 40 is designated as g;
(2) formula Q '=(0.5G+g) is utilized, the gross pressure Q ' that the whole track muscle 30 calculating a sliding rail 20 are subject to;
(3) the minimum elevator power of hoist engine 50 should equal to allow section steel beam 10 produce the force of sliding friction of linear uniform motion, so utilize formula T=μ Q ', calculate the minimum elevator power T of hoist engine 50, wherein, μ is section steel beam 10 and the coefficient of sliding friction under track muscle 30 contact conditions, obtains by the friction factor table looked in mechanical engineering manual;
(4) formula σ is utilized
e=T/ (π D
e 2/ 4) the stress σ that the wire rope, calculating hoist engine 50 is subject to
e, wherein, D
efor the diameter needed for described wire rope to be calculated;
(5) according to the stress σ that the wire rope of hoist engine 50 is subject to
ebe not more than the tensile strength f of described wire rope self
t, utilize formula σ
e≤ f
t, calculate the diameter D needed for described wire rope
e>=[4 μ (0.5G+g)]/π f
t.
The slide installation method of a kind of large span section steel beam of the present invention, by the design of turning support and pulley, the wire rope of hoist engine can be made to turn to, take full advantage of laterally with longitudinal space, solve the difficulty that the straight skidding length due to roofing cannot be constructed not.And, the sliding system adopting track muscle and hoist engine jointly to form carries out slippage to large span section steel beam and installs to locate and construct, track muscle coordinates with hoist engine, there is labour-saving feature, reduce the difficulty of construction, at short notice smooth for section steel beam slippage can be put in place and fall beam again to permanent position, there is speed of application fast, the advantages such as slippage stroke is long, and construction operation is continuous.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, not departing from the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a slide installation method for large span section steel beam, is characterized in that, comprising:
The both sides of the section steel beam in location to be installed install a sliding rail respectively;
Described sliding rail arranges track muscle;
In described sliding rail, cloth to be arranged on described track muscle, for the backing plate of section steel beam described in support;
Across the described section steel beam be arranged on described backing plate on two described sliding rails;
At the pulley that the end of described sliding rail side is installed turning support and is located on described turning support;
Hoist engine for driving described section steel beam slippage is set, by after pulley described in the steel wire penetrating of described hoist engine again along described sliding rail stretch-draw in described backing plate;
According to the installation anchor point of described section steel beam, by described hoist engine, described section steel beam slippage is put in place.
2. the slide installation method of a kind of large span section steel beam as claimed in claim 1, is characterized in that, at the pulley that the end of described sliding rail side is installed turning support and is located on described turning support, comprising:
Formation concrete foundation is built in the position of described turning support to be installed;
Described concrete foundation installs steel plate support;
At the sidepiece of described steel plate support, the otic placode offering earhole is set;
Described pulley is arranged on described earhole by suspension hook.
3. the slide installation method of a kind of large span section steel beam as claimed in claim 2, is characterized in that, arranges the otic placode offering earhole, comprising at the sidepiece of described steel plate support:
Calculate the distance of center circle of thickness needed for described otic placode and described earhole from the hole back gauge needed for described otic placode edge;
Thickness needed for the described otic placode calculated and the distance of center circle of described earhole, from the hole back gauge needed for described otic placode edge, make described otic placode;
Described otic placode is welded on described steel plate support.
4. the slide installation method of a kind of large span section steel beam as claimed in claim 3, is characterized in that, calculate the thickness needed for described otic placode, comprising:
Utilize formula
calculate the counter-force F that described pulley causes described otic placode, wherein, power when T' is described wire rope actual slip;
By the diameter D of described suspension hook
gwith the diameter D of described earhole self
rbe set to D
r<D
g;
Utilize formula σ
s=F/tD
g, obtain the local compressive stress σ of described otic placode
swith the mathematic(al) representation of the thickness t needed for described otic placode;
According to the local compressive stress σ of described otic placode
sbe not more than the compressive strength f of described otic placode self
s, utilize formula σ
s≤ f
s, calculate the thickness needed for described otic placode
5. the slide installation method of a kind of large span section steel beam as claimed in claim 4, is characterized in that, the distance of center circle calculating described earhole, from the hole back gauge needed for described otic placode edge, comprising:
Utilize formula V=0.5F, calculate the shear V of described suspension hook in the thickness range of described otic placode;
Utilize formula A
n=bt, obtains the projected area A of described suspension hook in the thickness range of described otic placode
nwith the distance of center circle of the described earhole mathematic(al) representation from the hole back gauge b needed for described otic placode edge;
Utilize formula τ=1.5V/A
n, obtain the mathematic(al) representation of the distance of center circle running through shearing stress τ and described earhole from the hole back gauge b needed for described otic placode edge of described otic placode;
The shear strength f that shearing stress τ is not more than described otic placode self is run through according to described otic placode
v, utilize formula τ≤f
v, calculate the distance of center circle of described earhole from the hole back gauge needed for described otic placode edge
6. the slide installation method of a kind of large span section steel beam as claimed in claim 1, it is characterized in that, described sliding rail arranges track muscle, comprising: calculate the diameter needed for track muscle for described section steel beam slippage, corresponding track muscle is set on described sliding rail according to result of calculation.
7. the slide installation method of a kind of large span section steel beam as claimed in claim 6, is characterized in that, calculates the diameter needed for track muscle for described section steel beam slippage, comprising:
By needing the quantity of the track muscle be arranged on a described sliding rail to be designated as N, the weight of described section steel beam being designated as G, the weight of described backing plate is designated as g;
Utilize formula Q=(0.5G+g)/N, calculate the pressure Q that a track muscle is subject to;
Utilize formula A=dL, obtain the mathematic(al) representation of the diameter d of the projected area A of a track muscle in the length range of described backing plate and described track muscle, wherein, L is the length of described backing plate;
Utilize formula σ=Q/A, obtain the mathematic(al) representation of the action intensity σ that is subject in the projected area of a track muscle in the length range of described backing plate and the diameter d needed for track muscle;
Be not more than the compressive strength f of track muscle self according to the action intensity σ be subject in the projected area of a track muscle in the length range of described backing plate, utilize formula σ≤f, calculate diameter d >=(the 0.5G+g)/NfL needed for track muscle.
8. the slide installation method of a kind of large span section steel beam as claimed in claim 1, it is characterized in that, by after pulley described in the steel wire penetrating of described hoist engine again along described sliding rail stretch-draw in described backing plate, comprise: the diameter needed for wire rope calculating described hoist engine, according to result of calculation by after pulley described in the steel wire penetrating of the correspondence of described hoist engine again along described sliding rail stretch-draw in described backing plate.
9. the slide installation method of a kind of large span section steel beam as claimed in claim 8, is characterized in that, calculates the diameter needed for wire rope of described hoist engine, comprising:
The weight of described section steel beam is designated as G, the weight of described backing plate is designated as g;
Utilize formula Q'=(0.5G+g), the gross pressure Q' that the whole described track muscle calculating a described sliding rail is subject to;
Utilize formula T=μ Q', calculate the minimum elevator power T of described hoist engine, wherein, μ is the coefficient of sliding friction under described section steel beam and described track muscle contact conditions;
Utilize formula σ
e=T/ (π D
e 2/ 4) the stress σ that the wire rope, obtaining described hoist engine is subject to
ewith the diameter D needed for described wire rope
emathematic(al) representation;
According to the stress σ that the wire rope of described hoist engine is subject to
ebe not more than the tensile strength f of described wire rope self
t, utilize formula σ
e≤ f
t, calculate the diameter D needed for described wire rope
e>=[4 μ (0.5G+g)]/π f
t.
10. the slide installation method of a kind of large span section steel beam according to any one of claim 1 ~ 9, is characterized in that, when arranging described track muscle, at described track muscle surface coating butter, forms sliding layer.
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| CN111576711A (en) * | 2020-05-21 | 2020-08-25 | 上海建工四建集团有限公司 | Multilayer multi-span double-T-shaped plate structure and construction method thereof |
| CN114214913A (en) * | 2022-02-08 | 2022-03-22 | 华神建设集团有限公司 | Large-span large-section steel beam and construction method |
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| CN111456460A (en) * | 2020-04-20 | 2020-07-28 | 中国电建集团四川工程有限公司 | Method for positioning steel beam on roof of garbage pool |
| CN111576711A (en) * | 2020-05-21 | 2020-08-25 | 上海建工四建集团有限公司 | Multilayer multi-span double-T-shaped plate structure and construction method thereof |
| CN111576711B (en) * | 2020-05-21 | 2021-06-01 | 上海建工四建集团有限公司 | Multilayer multi-span double-T-shaped plate structure and construction method thereof |
| CN114214913A (en) * | 2022-02-08 | 2022-03-22 | 华神建设集团有限公司 | Large-span large-section steel beam and construction method |
| CN114214913B (en) * | 2022-02-08 | 2024-02-20 | 华神建设集团有限公司 | Large-span large-section steel girder and construction method |
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