CN109371853A - Box beam tunnel face narrow and small place has bad luck relay construction system and method - Google Patents
Box beam tunnel face narrow and small place has bad luck relay construction system and method Download PDFInfo
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- CN109371853A CN109371853A CN201811456651.6A CN201811456651A CN109371853A CN 109371853 A CN109371853 A CN 109371853A CN 201811456651 A CN201811456651 A CN 201811456651A CN 109371853 A CN109371853 A CN 109371853A
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- pin shaft
- guide post
- box beam
- directional control
- carrying
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- 238000010276 construction Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000010354 integration Effects 0.000 claims abstract description 22
- 239000002828 fuel tank Substances 0.000 claims description 23
- 230000007423 decrease Effects 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 210000001015 abdomen Anatomy 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 2
- 230000000452 restraining effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 56
- 238000010586 diagram Methods 0.000 description 8
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000013011 mating Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/30—Constructional features with positive brakes or locks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/46—Combinations of several jacks with means for interrelating lifting or lowering movements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a kind of box beam tunnel face narrow and small places to have bad luck relay construction system and method, the big vehicle frame of beam machine, beam car, integration of transporting and building machine, box beam, roadbed, transporting device, hydraulic system are removed including tire, the roadbed is made of original roadbed and widening road bed, widening road bed is located at original roadbed side, the rear portion of widening road bed is equipped with oblique type roadbed, and the transporting device includes four groups and switches crossbeam and four groups of support changeover apparatus.The problems such as it is limited that the present invention solves tunnel face place, and tradition props up the vertical lifting beam machine mode of having bad luck and realizes difficulty, costly, reduces engineering cost, few by live restraining factors, and practicability is stronger.
Description
Technical field
The present invention relates to a kind of construction systems, more particularly to a kind of 900 tons of box beam tunnel face narrow and small places to have bad luck relay and apply
Work system and method.
Background technique
With the fast development of high-speed railway, 900 tons of prefabricated box -beam erection constructions are due to, construct matter fast with speed of application
It measures high feature to be widely adopted, but with the construction of high-speed railway, distance of growing up fortune beam operating condition and crosses tunnel operating condition of setting a roof beam in place and get over
Come more, greatly constrains the duration of setting a roof beam in place, traditional approach generally by the way that an area Ge Daoliang is arranged in tunnel face, adds two bale handles
Machine and beam pedestal is deposited, to solve the problems, such as, but this mode, it needs to build very big one piece of place, to meet the construction of falling beam, cost
Height, it is big that sign tears range open.Tight in order to solve the railway duration, tunnel face place is limited, and the vertical lifting beam machine mode of having bad luck of tradition branch is realized tired
Difficulty, and it is costly the problems such as, reduce engineering cost, China Railway No. 3 Engineering Group Bridge Engineering Co., Ltd. technical staff carries out special thus
Item research.
Summary of the invention
The purpose of the present invention is to solve the railway duration is tight, tunnel face place is limited, and tradition props up the vertical lifting beam machine side of having bad luck
The problems such as formula realization is difficult, costly, relay construction can be had bad luck in tunnel face narrow and small place progress box beam, reduce by providing one kind
Engineering cost improves working efficiency, practicability stronger construction system few by live restraining factors and method.
The purpose of the present invention is achieved through the following technical solutions:
Box beam tunnel face narrow and small place has bad luck relay construction system, including tire removes the big vehicle frame of beam machine, beam car, integration of transporting and building
Machine, box beam further include roadbed, transporting device, hydraulic system；
The roadbed is made of original roadbed and widening road bed, and widening road bed is located at original roadbed side, the rear portion of widening road bed
Equipped with oblique type roadbed；
The transporting device includes that at least two groups switch crossbeam and four groups of support changeover apparatus, and the support changeover apparatus includes upper
Crossbeam, left guide post, right guide post, fixed bracket, carrying oil cylinder, left carrying pin shaft, right carrying pin shaft, the carrying oil cylinder are perpendicular
It is directly mounted on fixed bracket, the piston end of the carrying oil cylinder is vertically fixed on upper beam, and the left guide post and the right side are led
Be vertically set on upper beam to column, the fixed bracket be equipped with the left pilot hole that cooperates with left guide post and with right guiding
The right pilot hole of column cooperation, uniformly distributed pin shaft hole, Zuo Cheng are provided in vertical direction in the left guide post and right guide post
It carries pin shaft to be placed in the pin shaft hole of left guide post, right carrying pin shaft is placed in the pin shaft hole of right guide post, left carrying pin shaft
Form the first position limiting structure with the pin shaft hole of the pin shaft hole of left guide post, right carrying pin shaft and right guide post, left carrying pin shaft with
The both ends of right carrying pin shaft each extend over out pin shaft hole, and the both ends for extending pin shaft hole are respectively bearing end, wherein into box beam
One end that the heart extends is the first bearing end, and one end far from box beam center is the second bearing end, is respectively arranged on fixed bracket
Loading plate corresponding with left carrying pin shaft and right carrying pin shaft, is respectively arranged on loading plate and the first bearing end, the second carrying
Corresponding second position limiting structure is held, second position limiting structure is by carrying pin shaft or the right carrying for carrying pin shaft and matching with left
Portion and the limiting section for limiting freedom degree in left carrying pin shaft or right carrying pin shaft horizontal direction form, the carrying on the first bearing end
Portion is additionally provided with the storage trough extended toward box beam center, and the length of the storage trough is not less than left carrying pin shaft or right bearing pins
The length of axis, support changeover apparatus are fixed on the mouth of falling beam tunnel place by concrete foundation, and support changeover apparatus position connects
Linear rectangular, the length for switching crossbeam is not less than the width of the rectangle；
The hydraulic system includes preceding hydraulic system and rear hydraulic system, one width direction of rectangle described in preceding HYDRAULIC CONTROL SYSTEM
On two groups of support changeover apparatus synchronization liftings, two groups of supports in another width direction of rectangle described in rear HYDRAULIC CONTROL SYSTEM
Changeover apparatus synchronization lifting.
Preferably, the central axis upright of the pin shaft hole is led in the central axis of left guide post or right guide post and with a left side
Intersect to column or the central axis of right guide post, is welded with guide pipe in pin shaft hole.
Preferably, the piston end of the carrying oil cylinder is fixed on the center of upper beam, the left guide post and right guiding
Column is respectively provided at the carrying piston rod two sides of oil cylinder and symmetrical about piston rod, carries piston rod and left guide post or the right side of oil cylinder
Guide post moves synchronously, and the stroke for carrying cylinder piston rod is less than the stroke of the left guide post or right guide post.
Preferably, rubber pad is equipped with above the upper beam, casting concrete basis, fixed below the fixed bracket
Leveling steel plate is additionally provided with below bracket.
Preferably, the crossbeam of switching is four groups of ox horn formula camber beams.
Preferably, the preceding hydraulic system and rear hydraulic system include fuel tank, hydraulic pump, check valve, No.1 three
Four-way reversing valve, flow divider, No. two three position four-way directional control valves, No. three three position four-way directional control valves, No.1 hydraulic cylinder, No. two it is hydraulic
Cylinder, throttle valve, No.1 overflow valve, No. two overflow valves, No. three overflow valves, No. four overflow valves, No. five overflow valves, the hydraulic pump
Oil inlet connects fuel tank, the oil inlet of the oil outlet connection check valve of hydraulic pump, and the oil outlet of check valve connects No.1 three four
The oil inlet P of logical reversal valve, the actuator port B connection fuel tank of No.1 three position four-way directional control valve, No.1 three position four-way directional control valve
The oil inlet of actuator port A connection flow divider, two oil outlets of flow divider be separately connected No. two three position four-way directional control valves into
The oil inlet P of hydraulic fluid port P and No. three three position four-way directional control valves, No. two three position four-way directional control valve actuator port A, actuator port B difference
Connect the oil inlet of No.1 overflow valve, No. two overflow valves, actuator port A, actuator port the B difference of No. three three position four-way directional control valves
Connect the oil inlet of No. three overflow valves, No. four overflow valves, the oil outlet of No.1 overflow valve and No. two overflow valves is separately connected No.1
The oil outlet of the upper hydraulic fluid port of hydraulic cylinder and lower hydraulic fluid port, No. three overflow valves and No. four overflow valves is separately connected oiling for No. two hydraulic cylinders
Mouthful and lower hydraulic fluid port, the oil return inlet T of No. two three position four-way directional control valves and No. three three position four-way directional control valves connect jointly throttle valve into
Hydraulic fluid port, the oil outlet of throttle valve connect the oil inlet of No. five overflow valves, and the oil outlet of No. five overflow valves separates two, a connection
The oil return inlet T of No.1 three position four-way directional control valve, another connection fuel tank.
Preferably, filter is connected between the hydraulic pump and fuel tank, described No. five between overflow valve and fuel tank
It is connected with filter, is equipped with liquidometer in the fuel tank.
Box beam tunnel face narrow and small place has bad luck the construction method of relay construction system, comprising the following steps:
S1: will switch crossbeam and be placed on beam car, and position state enters tire and removes in the big vehicle frame abdomen of beam machine in beam car, and tire is removed
The big vehicle frame of beam machine switching on crossbeam mounted in beam car by box beam；
S2: beam car is advanced on original roadbed, is diverted through oblique type roadbed, is advanced to widening road bed；
S3: beam car is advanced on widening road bed, reaches the position of four groups of support changeover apparatus, is fallen so that switching crossbeam with support
Changing device docking；
S4: preceding hydraulic system and rear hydraulic system control four groups of support changeover apparatus simultaneously and rise to hydraulic cylinder travel highest point,
And make the working face of four groups of support changeover apparatus contour, then lock hydraulic cylinder；
S5: beam car suspension reduces position, makes that changeover apparatus support is supported to switch crossbeam, beam car is separated with crossbeam is switched, then
Beam car is driven out to the lower section of box beam；
S6: preceding hydraulic system and rear hydraulic system controls two groups of front support changeover apparatus respectively and dress is switched in two groups of supports below
Set and alternately decline, before two groups of support changeover apparatus be preceding action group, behind two groups of support changeover apparatus be rear action group, it is described
Preceding action group and it is described after in action group wherein one group using another set as positioning datum, contour longitudinally adjacent two pin shafts of decline
The distance between hole, positioning datum remain stationary, and another set is again on the basis of one group of front, longitudinally adjacent two of contour decline
Left carrying pin shaft and right carrying pin shaft are inserted on a upper pin shaft hole by the distance between pin shaft hole before decline, so alternately, directly
To the position being integrally reduced to box beam with the cooperation of integration of transporting and building machine；
S7: integration of transporting and building machine is kept straight on original roadbed, drives to the side of box beam；
S8: integration of transporting and building machine is laterally moved to the surface of box beam, and box beam is lifted, and separates box beam with crossbeam is switched；
S9: integration of transporting and building machine mentions that box beam is traversing to be returned on original roadbed, and fortune beam sails out of.
Preferably, the step S4 includes following sub-step:
S41: while controlling preceding hydraulic system and rear hydraulic system, and No.1 three position four-way directional control valve turns left position, No. two 3-position 4-ways
Reversal valve and No. three three position four-way directional control valves equally turn left position；
S42: hydraulic pump is opened, so that four groups of hydraulic cylinder synchronous rise to hydraulic cylinder travel extreme higher position；
S43: No.1 three position four-way directional control valve turns middle position, closes throttle valve.
Preferably, the step S6 includes following sub-step:
S61: the left carrying pin shaft of two groups of front support changeover apparatus and right carrying pin shaft are inserted on minimum pin shaft hole；
S62: hydraulic system before controlling turns right No. two three position four-way directional control valves and No. three three position four-way directional control valves position, No.1 three
Position and four-way reversing valve turns left position, opens hydraulic pump, opens simultaneously throttle valve, after declining the distance between two pin shaft holes, closes
Throttle valve is closed, No.1 three position four-way directional control valve turns middle position；
S63: the left carrying pin shaft of two groups of support changeover apparatus below and right carrying pin shaft are inserted on minimum pin shaft hole；
S64: hydraulic system after control turns right No. two three position four-way directional control valves and No. three three position four-way directional control valves position, No.1 three
Position and four-way reversing valve turns left position, opens hydraulic pump, opens simultaneously throttle valve, after declining the distance between two pin shaft holes, closes
Throttle valve is closed, No.1 three position four-way directional control valve turns middle position；
S65: the left carrying pin shaft of two groups of front support changeover apparatus and right carrying pin shaft are extracted, and are inserted into a upper pin shaft hole；
S66: hydraulic system before controlling turns right No. two three position four-way directional control valves and No. three three position four-way directional control valves position, No.1 three
Position and four-way reversing valve turns left position, opens hydraulic pump, opens simultaneously throttle valve, after declining the distance between two pin shaft holes, closes
Throttle valve is closed, No.1 three position four-way directional control valve turns middle position；；
S67: the left carrying pin shaft of two groups of support changeover apparatus below and right carrying pin shaft are extracted, and are inserted into a upper pin shaft hole；
S68: hydraulic system after control turns right No. two three position four-way directional control valves and No. three three position four-way directional control valves position, No.1 three
Position and four-way reversing valve turns left position, opens hydraulic pump, opens simultaneously throttle valve, after declining the distance between two pin shaft holes, closes
Throttle valve is closed, No.1 three position four-way directional control valve turns middle position；
S69: repeating step S65 ~ S68, until entire box beam drops to the position with the cooperation of integration of transporting and building machine.
The beneficial effects of the present invention are:
(1) entire construction method solves that tunnel face place is limited, and tradition props up the vertical lifting beam machine mode of having bad luck and realizes difficulty, costly
The problems such as, engineering cost is reduced, it is few by live restraining factors, and practicability is stronger.
(2) crossbeam is switched using four groups and four groups of support changeover apparatus cooperate, considerably increase the peace for having bad luck box beam
Full property and stability, improve work efficiency, and two groups are switched crossbeam as spare, are used alternatingly, beam car is avoided to wait.
(3) the first position limiting structure is arranged in support changeover apparatus, falls box beam by the way of alternately declining, effectively prevent oil
When the abnormal unloading of cylinder, box beam falls suddenly；Second position limiting structure is set, limits left carrying pin shaft or right carrying pin shaft is horizontal
Freedom degree on direction reduces the shaking of piston rod axial direction；First position limiting structure cooperates the second position limiting structure, greatly improves
The stability of box beam in lifting process guarantees that box beam is not shaken, reduces fine error, provide safety guarantee.
Supporting part on (4) first bearing ends is additionally provided with the storage trough extended toward box beam center, left carrying pin shaft or the right side
Carrying pin shaft is placed in storage trough after directly extracting, and saving manpower and not easy to lose is welded with guide pipe, is convenient in pin shaft hole
Left carrying pin shaft or the insertion of right carrying pin shaft, save manpower and swift to operate.
Detailed description of the invention
Fig. 1 is that tire removes the rack-mounted beam schematic diagram of beam machine cart；
Fig. 2 is that dress beam beam car turns to schematic diagram；
Fig. 3 is that beam car is driven out to schematic diagram after putting down beam；
Fig. 4 is integration of transporting and building machine admission schematic diagram；
Fig. 5 is the traversing bale handle schematic diagram of integration of transporting and building machine；
Fig. 6 is that integration of transporting and building machine is driven out to schematic diagram；
Fig. 7 is that transporting device fills beam main view；
Fig. 8 is support changeover apparatus structure chart；
Fig. 9 is left carrying pin shaft or right carrying pin shaft and pin shaft hole mating part main view；
Figure 10 is left carrying pin shaft or right carrying pin shaft and pin shaft hole mating part side view；
Figure 11 is the second position limiting structure schematic diagram；
Figure 12 is another second position limiting structure schematic diagram；
Figure 13 is hydraulic system structure figure；
Figure 14 is direction valve position figure when hydraulic cylinder jacks；
Figure 15 is direction valve position figure when hydraulic cylinder declines；
In figure, 1- upper beam, the left guide post of 2-, the fixed bracket of 3-, 4- carrying oil cylinder, 5- loading plate, 6- storage trough, 7- pin shaft
Hole, the right guide post of 8-, 9- rubber pad, 10- level steel plate, 11- concrete foundation, 12- limiting section, 13- supporting part, 14- first
Bearing end, the second bearing end 15-, 16- support changeover apparatus, and 17- switches crossbeam, 18- box beam, and 19- tire removes the big vehicle frame of beam machine,
20- beam car, 21- integration of transporting and building machine, the original roadbed of 22-, 23- widening road bed, the oblique type roadbed of 24-, 25- No.1 hydraulic cylinder, 26-
No. two hydraulic cylinders, 27- No.1 overflow valve, No. bis- overflow valves of 28-, No. tri- overflow valves of 29-, No. tetra- overflow valves of 30-, 31- No. bis- three
Position and four-way reversing valve, No. tri- three position four-way directional control valves of 32-, 33- flow divider, 34- No.1 three position four-way directional control valve, 35- throttle valve,
No. five overflow valves of 36-, 37- check valve, 38- hydraulic pump, 39- filter, 40- liquidometer, 41- fuel tank.
Specific embodiment
Below in conjunction with embodiment, technical solution of the present invention is clearly and completely described, it is clear that described
Embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field
Technical staff's every other embodiment obtained under the premise of not making the creative labor belongs to what the present invention protected
Range.
Refering to fig. 1-15, the present invention provides a kind of technical solution:
Box beam tunnel face narrow and small place has bad luck relay construction system, including tire removes the big vehicle frame 19 of beam machine, beam car 20(model
Kirow900t), integration of transporting and building machine 21, box beam 18 further include roadbed, transporting device, hydraulic system.
The roadbed is made of original roadbed 22 and widening road bed 23, and widening road bed 23 is located at original 22 side of roadbed, is added
The rear portion of broad way base 23 is equipped with oblique type roadbed 24, and the widening road bed 23 is 10500mm long, wide 9800mm, the oblique type roadbed 24
It is 16000mm, the right angled triangle that bevel edge angle is 30 degree for right angle edge lengths；
The transporting device includes four groups and switches crossbeam 17 and four groups of support changeover apparatus 16, wherein two groups are switched the cooperation of crossbeam 17
In addition four groups of support changeover apparatus 16 switch crossbeam 17 as spare for two groups, are used alternatingly, beam car is avoided to wait, switch cross
Beam 17 is placed on beam car in advance, it is fixed with beam car, and when transporting beam, box beam 18, which is placed on, switches on crossbeam 17,
It is mobile with beam car to switch crossbeam 17.Preferably, the crossbeam 17 of switching is ox horn formula camber beam, when to avoid beam car from filling beam
The big vehicle frame of beam machine is removed with tire to interfere.
The support changeover apparatus 16 includes upper beam 1, left guide post 2, right guide post 8, fixed bracket 3, carrying oil cylinder
4, carry 4 cylinder diameter φ 450mm of oil cylinder, bar diameter φ 300mm, stroke 1200mm, support changeover apparatus further include left carrying pin shaft with
Right carrying pin shaft.
The carrying oil cylinder 4 is vertically installed on fixed bracket 3, and the piston end of the carrying oil cylinder 4 is vertical by bolt
It is fixed on upper beam 1, the left guide post 2 and right guide post 8 are vertically set on upper beam 1, are set on the fixed bracket 3
The right pilot hole for having the left pilot hole cooperated with left guide post 2 and cooperating with right guide post 8, left guide post 2 and left pilot hole,
Right guide post 8 is gap-matched with right pilot hole, is provided in the left guide post 2 and right guide post 8 in vertical direction
Seven uniformly distributed pin shaft holes 7, the distance between each pin shaft hole 7 are 200mm, and left carrying pin shaft is placed on the pin of left guide post 2
In axis hole 7, right carrying pin shaft is placed in the pin shaft hole 7 of right guide post 8, the pin shaft hole 7 of left carrying pin shaft and left guide post 2,
Right carrying pin shaft and the pin shaft hole 7 of right guide post 8 form the first position limiting structure.
The both ends of left carrying pin shaft and right carrying pin shaft each extend over out pin shaft hole 7, extend the both ends difference of pin shaft hole 7
For bearing end, wherein the one end extended toward box beam center is the first bearing end 14, and one end far from box beam center is the second carrying
End 15 is fixed on bracket 3 and is respectively arranged with loading plate 5 corresponding with left carrying pin shaft and right carrying pin shaft, on loading plate 5 respectively
Be provided with second position limiting structure corresponding with the first bearing end 14, the second bearing end 15, second position limiting structure by with a left side
The supporting part 13 and limit in left carrying pin shaft or right carrying pin shaft horizontal direction certainly that carrying pin shaft or right carrying pin shaft match
It is made of (the second position limiting structure is as shown in figure 11, can also be the appearance of Figure 12) the limiting section 12 spent, on the first bearing end 14
Supporting part 13 is additionally provided with the storage trough 6 extended toward box beam center, the length of the storage trough 6 not less than left carrying pin shaft or
The length of right carrying pin shaft, left carrying pin shaft or right carrying pin shaft are placed in storage trough 6 after directly extracting, and are not removed manually
It moves, saves manpower.Pre-buried anchor bolt or reserved steel bar, then casting concrete basis 11 are needed below the fixation bracket 3, are mixed
Solidifying 11 bearing capacity of earth foundation need to meet 150t/ ㎡, and to support the fixation of changeover apparatus 16, support changeover apparatus 16 passes through coagulation
Earth foundation 11 is fixed on the mouth of falling beam tunnel place, and concrete foundation 11 is 5550mm long, wide 2500mm, tall and big in 1000mm, concrete
Basis 11 is located on four angles of rectangle, a length of 27600mm of rectangle, and being wider than for rectangle is equal to the length for switching crossbeam 17
Degree.
Further, the central axis upright of the pin shaft hole 7 in the central axis of left guide post 2 or right guide post 8 and
Intersect with the central axis of left guide post 2 or right guide post 8, i.e., the depth of pin shaft hole 7 is equal to left guide post 2 or right guide post 8
Diameter.
Preferably, it is welded with guide pipe in the pin shaft hole 7, left carrying pin shaft or right carrying pin shaft is facilitated to be inserted into.
Further, the piston end of the carrying oil cylinder 4 is fixed on the center of upper beam 1, the left guide post 2 and the right side
Guide post 8 is respectively provided at the carrying piston rod two sides of oil cylinder 4 and symmetrical about piston rod, and the piston rod of carrying oil cylinder 4 is led with a left side
It is moved synchronously to column 2 or right guide post 8, left guide post 2 and right guide post 8 guarantee carrying 4 piston rod of oil cylinder only in vertical direction
It is flexible, increase the impetus of upper beam 1,1 stress of upper beam is balanced, so that box beam is not easy to shake in lifting process.
The stroke of carrying 4 piston rod of oil cylinder is less than the stroke of the left guide post 2 or right guide post 8, guarantees to hold
When load 4 piston rod of oil cylinder reaches maximal tensility, left guide post 2 is led without departing from left pilot hole, right guide post 8 without departing from the right side
Xiang Kong.
The lower section of the left carrying pin shaft or right carrying pin shaft is contacted with supporting part 13, and supporting part 13 assumes responsibility for vertical side
To load, it is left carrying pin shaft or it is right carrying pin shaft two sides with limiting section 12 contact, limiting section 12 assumes responsibility for horizontal direction
Load.
It is equipped with rubber pad 9 above the upper beam 1, switches crossbeam for placement above upper beam 1 and anti-skidding guarantee is provided.Gu
Pre-buried anchor bolt or reserved steel bar, then casting concrete basis 11 are needed below fixed rack 3,11 bearing capacity of concrete foundation need to expire
Sufficient 150t/ ㎡, to support the fixation of changeover apparatus.Leveling steel plate 10 is additionally provided with below fixed bracket 3, for fixing bracket 3
Leveling.
The hydraulic system includes preceding hydraulic system and rear hydraulic system, one width of rectangle described in preceding HYDRAULIC CONTROL SYSTEM
Two groups of 16 synchronization liftings of support changeover apparatus on direction, two in another width direction of rectangle described in rear HYDRAULIC CONTROL SYSTEM
Group support 16 synchronization lifting of changeover apparatus.
Specifically, the preceding hydraulic system and rear hydraulic system include fuel tank 41, hydraulic pump 38, check valve 37, one
Number three position four-way directional control valve 34, the three position four-way directional control valve 32 of three position four-way directional control valve 31, three of flow divider 33, two, No.1 liquid
25, No. two hydraulic cylinders 26 of cylinder pressure, throttle valve 35,29, No. four overflows of overflow valve of overflow valve 28, three of No.1 overflow valve 27, two
30, No. five overflow valves 36 of valve.
The oil inlet of the hydraulic pump 38 connects fuel tank 41, and the oil outlet of hydraulic pump 38 connects the oil inlet of check valve 37,
Check valve 37 oil outlet connection No.1 three position four-way directional control valve 34 oil inlet P, check valve 37 guarantee hydraulic oil can only from into
Hydraulic fluid port into, go out from oil outlet, the actuator port B connection fuel tank 41 of No.1 three position four-way directional control valve 34, No.1 3-position 4-way commutation
The oil inlet of the actuator port A connection flow divider 33 of valve 34, two oil outlets of flow divider 33 are separately connected No. two 3-position 4-ways
The oil inlet P of the oil inlet P of reversal valve 31 and No. three three position four-way directional control valves 32, No. two 31 actuator ports of three position four-way directional control valve
A, actuator port B is separately connected the oil inlet of 27, No. two overflow valves 28 of No.1 overflow valve, the work of No. three three position four-way directional control valves 32
Make hydraulic fluid port A, actuator port B is separately connected the oil inlets of 29, No. four overflow valves 30 of No. three overflow valves, No.1 overflow valve 27 and No. two
The oil outlet of overflow valve 28 is separately connected the upper hydraulic fluid port and lower hydraulic fluid port, No. three overflow valves 29 and No. four overflow valves of No.1 hydraulic cylinder 25
30 oil outlet be separately connected No. two hydraulic cylinders 26 upper hydraulic fluid port and lower hydraulic fluid port, No. two three position four-way directional control valves 31 and No. three three
The oil return inlet T of four-way reversing valve 32 connects the oil inlet of throttle valve 35 jointly, and the oil outlet of throttle valve 35 connects No. five overflow valves
36 oil inlet, the oil outlet of No. five overflow valves 36 separate two, the oil return opening of a connection No.1 three position four-way directional control valve 34
T, another connection fuel tank 41.
Further, filter 39, No. five 36 Hes of overflow valve are connected between the hydraulic pump 38 and fuel tank 41
Also it is connected with filter 39 between fuel tank 41, filters in hydraulic system and various impurity occurs.Liquidometer is equipped in the fuel tank 41
40, monitor the oil mass in fuel tank 41.The No.1 hydraulic cylinder 25 and No. two hydraulic cylinders 26 are two-way cylinder, and piston rod rises
Decline is controllable.No. two three position four-way directional control valves 31 and No. three three position four-way directional control valves 32 are Y type 3-position 4-way
Hand-operated direction valve, the No.1 three position four-way directional control valve 34 are M type 3-position 4-way hand-operated direction valve.
Box beam tunnel face narrow and small place has bad luck the construction method of relay construction system, comprising the following steps:
S1: will switch crossbeam 17 and be placed on beam car 20, and position state enters tire and removes big 19 abdomen of vehicle frame of beam machine in beam car 20
Interior, tire removes beam machine big vehicle frame 19 and switching box beam 18 on crossbeam 17 mounted in beam car 20；
S2: beam car 20 is advanced on original roadbed 22, is diverted through oblique type roadbed 24, is advanced to widening road bed 23；
S3: beam car 20 is advanced on widening road bed 23, the position of four groups of support changeover apparatus 16 is reached, so that switching crossbeam 17
It is docked with support changeover apparatus 16；
S4: preceding hydraulic system and rear hydraulic system control four groups of support changeover apparatus 16 simultaneously and rise to hydraulic cylinder travel highest
Place, and make the working face of four groups of support changeover apparatus 16 contour, then lock hydraulic cylinder；
S5: the suspension of beam car 20 reduces position, makes that the support of changeover apparatus 16 is supported to switch crossbeam 17, beam car 20 and switches crossbeam 17
Separation, then beam car 20 is driven out to the lower section of box beam 18；
S6: preceding hydraulic system and rear hydraulic system controls two groups of front support changeover apparatus 16 respectively and two groups of supports below are switched
Device 16 alternately declines, before two groups of support changeover apparatus 16 be preceding action group, behind two groups of support changeover apparatus 16 be after move
Make group, the preceding action group and it is described after in action group wherein one group using another set as positioning datum, contour decline longitudinal direction phase
The distance between adjacent two pin shaft holes 7, positioning datum remains stationary, and another set is again on the basis of one group of front, contour decline
Left carrying pin shaft and right carrying pin shaft are inserted into a upper pin shaft hole 7 before decline by the distance between longitudinally adjacent two pin shaft holes 7
On, so alternately, until 18 entirety of box beam is reduced to the position cooperated with integration of transporting and building machine 21 (reducing 1200mm)；
S7: integration of transporting and building machine 21 is kept straight on original roadbed 22, drives to the side of box beam 18；
S8: integration of transporting and building machine 21 is laterally moved to the surface of box beam 18, and box beam 18 is lifted, and divides box beam 18 with crossbeam 17 is switched
From；
S9: integration of transporting and building machine 21 mentions that box beam 18 is traversing to be returned on original roadbed 22, and fortune beam sails out of.
Further, the step S4 includes following sub-step:
S41: while controlling preceding hydraulic system and rear hydraulic system, and No.1 three position four-way directional control valve 34 turns left position, and No. two three four
Logical reversal valve 31 and No. three three position four-way directional control valves 32 turn left position；
S42: hydraulic pump 38 is opened, so that four groups of hydraulic cylinder synchronous rise to hydraulic cylinder travel extreme higher position.
S43: throttle valve 35 is closed in 34 turns of middle positions of No.1 three position four-way directional control valve；
Further, the step S4 can be any step before step S5, i.e., this step can step S1 ~ S3 it
Before, it can also be after step S1 ~ S3, it can also be between step S1 ~ S3.
Specifically, the step S6 includes following sub-step:
S61: the left carrying pin shaft of two groups of front support changeover apparatus 16 and right carrying pin shaft are inserted into minimum pin shaft hole 7
On；
S62: hydraulic system before controlling turns right No. two three position four-way directional control valves 31 and No. three three position four-way directional control valves 32 position, and one
Number three position four-way directional control valve 34 turns left position, opens hydraulic pump 38, throttle valve 35 is opened simultaneously, wait decline between two pin shaft holes 7
Distance (200mm) after, close throttle valve 35,34 turns of middle positions of No.1 three position four-way directional control valve；
S63: the left carrying pin shaft of two groups of support changeover apparatus 16 below and right carrying pin shaft are inserted into minimum pin shaft hole 7
On；
S64: hydraulic system after control turns right No. two three position four-way directional control valves 31 and No. three three position four-way directional control valves 32 position, and one
Number three position four-way directional control valve 34 turns left position, opens hydraulic pump 38, throttle valve 35 is opened simultaneously, wait decline between two pin shaft holes 7
Distance after, close throttle valve 35,34 turns of middle positions of No.1 three position four-way directional control valve；
S65: the left carrying pin shaft of two groups of front support changeover apparatus 16 and right carrying pin shaft are extracted, and are inserted into a upper pin shaft hole
7；
S66: hydraulic system before controlling turns right No. two three position four-way directional control valves 31 and No. three three position four-way directional control valves 32 position, and one
Number three position four-way directional control valve 34 turns left position, opens hydraulic pump 38, throttle valve 35 is opened simultaneously, wait decline between two pin shaft holes 7
Distance (200mm) after, close throttle valve 35,34 turns of middle positions of No.1 three position four-way directional control valve；
S67: the left carrying pin shaft of two groups of support changeover apparatus 16 below and right carrying pin shaft are extracted, and are inserted into a upper pin shaft hole
7；
S68: hydraulic system after control turns right No. two three position four-way directional control valves 31 and No. three three position four-way directional control valves 32 position, and one
Number three position four-way directional control valve 34 turns left position, opens hydraulic pump 38, throttle valve 35 is opened simultaneously, wait decline between two pin shaft holes 7
Distance after, close throttle valve 35,34 turns of middle positions of No.1 three position four-way directional control valve；
S69: repeating step S65 ~ S68, until entire box beam 18 drops to the position cooperated with integration of transporting and building machine 21 (decline
1200mm).
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this
In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention
It is interior.
Claims (8)
1. box beam tunnel face narrow and small place has bad luck relay construction system, including tire remove the big vehicle frame of beam machine (19), beam car (20),
Integration of transporting and building machine (21), box beam (18), it is characterised in that: it further include roadbed, transporting device, hydraulic system,
The roadbed is made of original roadbed (22) and widening road bed (23), and widening road bed (23) is located at original roadbed (22) one
The rear portion of side, widening road bed (23) is equipped with oblique type roadbed (24)；
The transporting device includes that at least two groups switch crossbeam (17) and four groups of support changeover apparatus (16), and dress is switched in the support
Setting (16) includes upper beam (1), left guide post (2), right guide post (8), fixed bracket (3), carrying oil cylinder (4), left bearing pins
Axis, right carrying pin shaft, the carrying oil cylinder (4) are vertically installed on fixed bracket (3), the piston end of carrying oil cylinder (4)
It is vertically fixed on upper beam (1), the left guide post (2) and right guide post (8) are vertically set on upper beam (1), described
Fixed bracket (3) are equipped with the left pilot hole cooperated with left guide post (2) and the right pilot hole with right guide post (8) cooperation,
It is provided with uniformly distributed pin shaft hole (7) in the left guide post (2) and right guide post (8) in vertical direction, left carrying pin shaft is put
It sets in the pin shaft hole (7) of left guide post (2), right carrying pin shaft is placed in the pin shaft hole (7) of right guide post (8), left carrying
Pin shaft hole (7) composition the first limit knot of pin shaft and the pin shaft hole (7) of left guide post (2), right carrying pin shaft and right guide post (8)
The both ends of structure, left carrying pin shaft and right carrying pin shaft each extend over out pin shaft hole (7), extend the both ends difference of pin shaft hole (7)
For bearing end, wherein the one end extended toward box beam center is the first bearing end (14), and one end far from box beam center is held for second
It carries end (15), is respectively arranged with loading plate (5) corresponding with left carrying pin shaft and right carrying pin shaft on fixed bracket (3), carry
It is respectively arranged with the second position limiting structure corresponding with the first bearing end (14), the second bearing end (15) on plate (5), described second
Position limiting structure is by the supporting part (13) and the left carrying pin shaft of limitation that match with left carrying pin shaft or right carrying pin shaft or right carrying
Limiting section (12) composition of freedom degree, the supporting part (13) on the first bearing end (14) are additionally provided with toward case in pin shaft horizontal direction
The storage trough (6) that beam center extends, the length of the storage trough (6) is not less than left carrying pin shaft or the right length for carrying pin shaft
Degree, support changeover apparatus (16) is fixed on the mouth of falling beam tunnel place by concrete foundation (11), where support changeover apparatus (16)
Position line forms rectangle, and the length for switching crossbeam (17) is not less than the width of the rectangle；
The hydraulic system includes preceding hydraulic system and rear hydraulic system, one width direction of rectangle described in preceding HYDRAULIC CONTROL SYSTEM
On two groups of support changeover apparatus (16) synchronization liftings, two groups in another width direction of rectangle described in rear HYDRAULIC CONTROL SYSTEM
Support changeover apparatus (16) synchronization lifting.
2. box beam tunnel face according to claim 1 narrow and small place has bad luck relay construction system, it is characterised in that: the pin
The central axis upright of axis hole (7) in the central axis of left guide post (2) or right guide post (8) and with left guide post (2) or the right side
The central axis of guide post (8) intersects, and is welded with guide pipe in pin shaft hole (7).
3. box beam tunnel face according to claim 1 narrow and small place has bad luck relay construction system, it is characterised in that: described
The piston end of carrying oil cylinder (4) is fixed on the center of upper beam (1), and the left guide post (2) and right guide post (8) are respectively provided at
Carry the piston rod two sides of oil cylinder (4) and, the piston rod of carrying oil cylinder (4) and left guide post (2) or right symmetrical about piston rod
Guide post (8) moves synchronously, and the stroke of carrying oil cylinder (4) piston rod is less than the row of the left guide post (2) or right guide post (8)
Journey.
4. box beam tunnel face according to claim 1 narrow and small place has bad luck relay construction system, it is characterised in that: described
Rubber pad (9) are equipped with above upper beam (1), casting concrete is basic (11) below the fixed bracket (3), fixed bracket (3)
Lower section is additionally provided with leveling steel plate (10).
5. box beam tunnel face according to claim 1 narrow and small place has bad luck relay construction system, it is characterised in that: described
Switching crossbeam (17) is four groups of ox horn formula camber beams.
6. box beam tunnel face according to claim 1 narrow and small place has bad luck relay construction system, it is characterised in that: described
Preceding hydraulic system and rear hydraulic system include fuel tank (41), hydraulic pump (38), check valve (37), No.1 three position four-way directional control valve
(34), flow divider (33), No. two three position four-way directional control valves (31), No. three three position four-way directional control valves (32), No.1 hydraulic cylinder (25),
No. two hydraulic cylinders (26), throttle valve (35), No.1 overflow valve (27), No. two overflow valves (28), No. three overflow valves (29), No. four overflow
Valve (30), No. five overflow valves (36) are flowed, the oil inlet of the hydraulic pump (38) connects fuel tank (41), the oil outlet of hydraulic pump (38)
The oil inlet of check valve (37) is connected, the oil outlet of check valve (37) connects the oil inlet P of No.1 three position four-way directional control valve (34),
The actuator port B connection fuel tank (41) of No.1 three position four-way directional control valve (34), the working oil of No.1 three position four-way directional control valve (34)
The oil inlet of mouth A connection flow divider (33), two oil outlets of flow divider (33) are separately connected No. two three position four-way directional control valves
(31) oil inlet P of oil inlet P and No. three three position four-way directional control valves (32), No. two three position four-way directional control valve (31) actuator ports
A, actuator port B is separately connected the oil inlet of No.1 overflow valve (27), No. two overflow valves (28), No. three three position four-way directional control valves
(32) actuator port A, actuator port B is separately connected the oil inlet of No. three overflow valves (29), No. four overflow valves (30), and No.1 is overflow
Stream valve (27) and the oil outlet of No. two overflow valves (28) be separately connected No.1 hydraulic cylinder (25) upper hydraulic fluid port and lower hydraulic fluid port, No. three are excessive
Stream valve (29) and No. four overflow valves (30) oil outlet be separately connected No. two hydraulic cylinders (26) upper hydraulic fluid port and lower hydraulic fluid port, No. two three
The oil return inlet T of position and four-way reversing valve (31) and No. three three position four-way directional control valves (32) connects the oil inlet of throttle valve (35) jointly,
The oil outlet of throttle valve (35) connects the oil inlet of No. five overflow valves (36), and the oil outlet of No. five overflow valves (36) separates two,
The oil return inlet T of one connection No.1 three position four-way directional control valve (34), another connection fuel tank (41).
7. box beam tunnel face according to claim 6 narrow and small place has bad luck relay construction system, it is characterised in that: described
It is connected between hydraulic pump (38) and fuel tank (41) filter (39), also connects between No. five overflow valves (36) and fuel tank (41)
Have filter (39), is equipped with liquidometer (40) in the fuel tank (41).
8. box beam tunnel face narrow and small place described in any one of -7 has bad luck the construction party of relay construction system according to claim 1
Method, which comprises the following steps:
S1: will switch crossbeam (17) and be placed on beam car (20), and position state enters tire and removes beam machine cart in beam car (20)
In frame (19) abdomen, tire removes the big vehicle frame of beam machine (19) and switching box beam (18) on crossbeam (17) mounted in beam car (20)；
S2: beam car (20) is advanced on original roadbed (22), is diverted through oblique type roadbed (24), is advanced to widening road bed
(23)；
S3: beam car (20) is advanced on widening road bed (23), the position of four groups of support changeover apparatus (16) is reached, so that switching
Crossbeam (17) is docked with support changeover apparatus (16)；
S4: preceding hydraulic system and rear hydraulic system control four groups of support changeover apparatus (16) simultaneously and rise to hydraulic cylinder travel highest
Place, and make the working face of four groups of support changeover apparatus (16) contour, then lock hydraulic cylinder；
S5: beam car (20) suspension reduce position, make support changeover apparatus (16) support switch crossbeam (17), beam car (20) with fall
Crossbeam (17) separation is changed, then beam car (20) is driven out to the lower section of box beam (18)；
S6: preceding hydraulic system and rear hydraulic system controls two groups of front support changeover apparatus (16) respectively and two groups of supports below are fallen
Changing device (16) alternately declines, before two groups of support changeover apparatus (16) be preceding action group, behind two groups of support changeover apparatus
(16) be rear action group, the preceding action group and it is described after in action group wherein one group using another set as positioning datum, it is contour
Decline the distance between longitudinally adjacent two pin shaft holes (7), positioning datum remains stationary, and another set is again using one group of front as base
Left carrying pin shaft and right carrying pin shaft, are inserted by standard, the distance between contour longitudinally adjacent two pin shaft holes (7) of decline before decline
On a upper pin shaft hole (7), so alternately, until box beam (18) to be integrally reduced to the position with integration of transporting and building machine (21) cooperation
It sets；
S7: integration of transporting and building machine (21) is kept straight on original roadbed (22), drives to the side of box beam (18)；
S8: integration of transporting and building machine (21) is laterally moved to the surface of box beam (18), and box beam (18) is lifted, and makes box beam (18) and switches cross
Beam (17) separation；
S9: integration of transporting and building machine (21) mentions that box beam (18) is traversing to be returned on original roadbed (22), and fortune beam sails out of.
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| CN201811456651.6A CN109371853B (en) | 2018-11-30 | 2018-11-30 | Box girder tunnel portal narrow field transportation relay construction system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456651.6A CN109371853B (en) | 2018-11-30 | 2018-11-30 | Box girder tunnel portal narrow field transportation relay construction system and method |
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| CN109371853B CN109371853B (en) | 2023-11-28 |
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Cited By (3)
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| CN110904810A (en) * | 2019-06-27 | 2020-03-24 | 李新亚 | Rapid erecting system for high-speed railway box girder |
| CN111576218A (en) * | 2020-04-28 | 2020-08-25 | 中交二航局第四工程有限公司 | Method for rapidly transferring segment box girder on land |
| CN114411572A (en) * | 2021-12-31 | 2022-04-29 | 中铁十四局集团青岛工程有限公司 | Novel precast box girder beam mounting operation method |
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| CN111576218A (en) * | 2020-04-28 | 2020-08-25 | 中交二航局第四工程有限公司 | Method for rapidly transferring segment box girder on land |
| CN111576218B (en) * | 2020-04-28 | 2021-10-15 | 中交二航局第四工程有限公司 | Method for rapidly transferring segment box girder on land |
| CN114411572A (en) * | 2021-12-31 | 2022-04-29 | 中铁十四局集团青岛工程有限公司 | Novel precast box girder beam mounting operation method |
| CN114411572B (en) * | 2021-12-31 | 2024-03-01 | 中铁十四局集团青岛工程有限公司 | Beam loading operation method for prefabricated box beam |
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| CN109371853B (en) | 2023-11-28 |
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