CN112249899A

CN112249899A - Special construction process for installing gantry of stacker-reclaimer

Info

Publication number: CN112249899A
Application number: CN202011079577.8A
Authority: CN
Inventors: 尚明峰; 聂宝桂; 张平; 高义龙; 吴金宝
Original assignee: Shanxi Industrial Equipment Installation Group Co Ltd
Current assignee: Shanxi Industrial Equipment Installation Group Co Ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-01-22

Abstract

The invention discloses a special construction process for installing a gantry of a stacker-reclaimer, which comprises the following steps: firstly, setting a crane station, adopting four truck cranes for hoisting, wherein two 350t truck cranes are main cranes, hoisting points of the two truck cranes are arranged at the centers of two arms at the top of a portal one above the other, the hoisting point of one 130t truck crane is arranged at the position close to a central column of the portal, the hoisting point of the other 80t truck crane is arranged at the side of a portal travelling mechanism, and secondly, the travelling mechanism is hoisted, and thirdly, the portal hoisting test is carried out, firstly, the two cranes of the portal are slowly hoisted under the command of a crane, the hoisting is carried out for 0.5m, the head of the portal is lifted, the 130t truck crane of a point B is lifted, the 80t truck crane of the point C is slightly lifted away from the ground, waiting for 10 min, the stress condition of each stress point is checked, the steps IV and portal are turned, and the portal is lifted and positioned, the structural design of the invention is reasonable, and the effective installation of the portal is realized under the, time is saved, and positioning adjustment is facilitated.

Description

Special construction process for installing gantry of stacker-reclaimer

Technical Field

The invention relates to the technical field of mounting of a gantry of a stacker-reclaimer, in particular to a special construction process for mounting the gantry of the stacker-reclaimer.

Background

The portal is L-shaped irregular equipment, the span is 50 meters, the portal is divided into two 2800mm 1000mm box-shaped structures, the horizontal projection length of the portal is 50.82 meters, the portal is formed by welding and assembling steel plates and section steel, the equipment is supplied separately from a factory, is assembled and installed on site, is assembled at present and is qualified after being accepted, and the hoisting and hoisting conditions are met.

The first scheme is as follows: in the prior engineering example, the weight and the size are consistent with those of the engineering, because the steel ball net rack is not installed when the steel ball net rack is used, the operating space of a crane is large, a main hoisting point is selected to be at the highest point of a portal, two cranes of 260 tons are used, a truck crane of 130 tons is arranged at the position close to a central column, a crane of 100 tons is selected at the position close to a coal yard track, and turning, hoisting and installation are realized under the coordination of hoisting personnel;

scheme II: in another engineering example, the steel ball net rack is not installed, the construction condition is better, two main hoisting points are selected, and four 220-ton cranes are respectively adopted at two positions of the portal frame to realize turning, hoisting and installation;

the hoisting portal frame has the characteristics of large span and large hoisting weight, and both the scheme I and the scheme II have examples, but according to the previous construction experience, the scheme I has larger deformation, long hoisting time and difficult positioning adjustment, and the scheme II has better stress condition but unbalanced and outstanding hoisting.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a special construction process for installing a portal of a stacker-reclaimer, which can realize effective installation of the portal when a steel ball net rack is installed.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

a special construction process for installing a gantry of a stacker-reclaimer comprises the following steps:

step one, setting a crane station

Four truck cranes are adopted for hoisting, wherein two 350t truck cranes are main cranes, the hoisting points of the two truck cranes are arranged above and below the centers of two arms at the top of the gantry (point A, namely the center of the section D at the top of the gantry), and are firmly bound by steel wire ropes respectively, the hoisting point of one 130t truck crane is arranged at the position, close to the center post, of the gantry (point B, namely the center of the support of the section A), the hoisting point of the other 80t truck crane is arranged at the side of a gantry traveling mechanism (point C, namely the center of the support of the section E of the gantry), and each hoisting point is fixed by steel wire ropes;

step two, hoisting of the travelling mechanism

Firstly, a 350t truck crane is used for hoisting a travelling mechanism on a track on the top of a coal yard retaining wall, and the travelling mechanism is padded by using a rail;

step three, portal hoisting test

Firstly, slowly hoisting two cranes of a portal frame under the command of a crane, lifting for 0.5m, lifting the head of the portal frame, slightly lifting the truck crane at the point B for 130t, slightly lifting the truck crane at the point C away from the ground, waiting for 10 minutes, checking the stress condition of each stress point, checking whether the hoisting weight of each crane meets the requirement of designed hoisting weight, checking the stress condition of each binding rope, checking whether the instant stress load exists, checking whether the steel wire rope is distorted, and checking the protection condition of the steel wire rope and a contact of the portal frame, and then carrying out next step of work after the checking is correct;

step four, gantry swivel

After the portal hoisting experiment is successful, under the command of a crane, four cranes slowly lift the hook until the portal is hoisted to about 2 meters away from the ground, then two 350t automobile cranes slowly lift the hook, two auxiliary cranes slowly drop the hook until the portal is upright, meanwhile, the cranes on two sides constantly pay attention to the hoisting weight to prevent overweight until the portal is stably rotated, and at the moment, 80t automobile cranes at the point C can be withdrawn;

fifthly, lifting the gantry in place

The four cranes are matched, under the condition that 350t of the truck crane at the point A is hoisted, the gantry at one side of the point C is lifted first, meanwhile, 130t of the truck crane at the point B is matched, but is not lifted first temporarily, after the gantry end at the point C exceeds a coal yard retaining wall, the lifting is stopped, the gantry is delivered to the outer side of a coal yard until the gantry at the side of the central column at the point B can be sleeved into the central column, the 350t of the truck crane at the point A and the crane at the point B are stably pivoted arms and sleeved into the gantry, the gantry is fixedly connected with the central column, the elevation gantry and the central line are adjusted by the 130t of the truck crane at the point B, the hinged rotating shaft at the side of the central column of the gantry is in place, a welder welds and fixes the truck. And then the truck crane at the point A of 350t is lifted, so that the gantry at the point C is lifted to exceed the top surface of the travelling mechanism, the gantry slowly rotates around the gantry center column, the gantry is located on the upper plane of the travelling mechanism, the fixing bolt is immediately fixed, and at the moment, the hoisting and installation of the gantry are finished.

Preferably, in the above special construction process for installing the gantry of the stacker-reclaimer, in the first step, the hoisting point a, the hoisting point B and the hoisting point C of the gantry all adopt steel wire ropes of 6 × 37+1- Φ 64mm, the hoisting point a of the gantry winds a single arm of the gantry for two circles by using two steel wire ropes of 6 × 37+1- Φ 64mm, and a suitable steel wire rope is selected to reduce the possibility of breakage during hoisting.

Preferably, the construction process special for installing the gantry of the stacker-reclaimer is characterized in that in the third step, the position of the steel wire rope bound on the gantry is provided with an anti-slip stop block, the anti-slip stop block comprises a quarter thick-skin steel pipe, the quarter thick-skin steel pipe is welded at the edge of the gantry, angle steel fixing blocks are welded at the left end and the right end of the quarter thick-skin steel pipe, and the steel wire rope is prevented from slipping through the anti-slip stop block.

Preferably, in the special construction process for installing the gantry of the stacker-reclaimer, in the fifth step, after the gantry is in place, the hinge structure is positioned and fixed in time by the positioning bolt according to the hinge position on the side of the central column of the assembly drawing and is welded and fixed in time, the weld joint reaches 100% of the thickness of the steel plate, the gantry is firmly connected with the traveling mechanism by the permanent bolt according to the assembly drawing, and before the installation work is finished, the crane cannot be unhooked, so that the hoisting safety is improved.

Compared with the prior art, the invention has the following beneficial effects:

the invention has reasonable structural design, and comprises the following steps: compared with the first scheme and the second scheme, when the steel ball net rack is installed on the blocking wall of the coal yard, the project is optimized on the basis of the first scheme, two 350-t truck cranes are used as main cranes, and the two ends of the truck crane are hoisted by using 130-t truck cranes and 80-t truck cranes in a matched mode, so that the effective installation of the portal frame is realized, the time is saved, and the positioning and the adjustment are facilitated;

secondly, the method comprises the following steps: the anti-skidding stop blocks are welded at the binding positions of the steel wire ropes on the portal frame, so that the steel wire ropes are prevented from slipping during hoisting;

thirdly, the method comprises the following steps: the foundation at the supporting legs of the truck crane is subjected to soil replacement, gravel addition and compaction, the thickness of the foundation is changed and filled to be 0.5m, a layer of road wood is added, and then a steel base plate special for the crane is used, so that the bearing capacity of the foundation at the supporting legs is improved.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view showing a connection state of a tennis ball and a retaining wall of a coal yard according to the present invention;

FIG. 2 is a construction floor plan of the present invention;

FIG. 3 is a schematic view of the position of the door frame of FIG. 2 before being hoisted according to the present invention;

FIG. 4 is a schematic view of the position of the door frame of FIG. 2 after completion of the hoisting process;

FIG. 5 is a first schematic view of the anti-slip stopper of the present invention;

FIG. 6 is a second schematic structural view of the anti-slip stopper of the present invention;

FIG. 7 is a schematic view of the connection between the gantry and the center post according to the present invention;

FIG. 8 is a schematic view of the connection between the track and the traveling mechanism according to the present invention;

FIG. 9 is an exploded multi-sectional structural view of the door frame of the present invention;

FIG. 10 is a graph of the calculation of distance from the center of gravity of multiple sections of the portal of the present invention to the Y-axis;

FIG. 11 is a schematic view of a mechanical analysis of a portal of the present invention;

FIG. 12 is a first schematic diagram of a 350t truck crane of the present invention;

FIG. 13 is a schematic diagram of the hoisting of a 350t truck crane according to the present invention;

FIG. 14 is a schematic view of the most disadvantageous point of the crane of the present invention;

FIG. 15 is a schematic view of the moment of the crane of the present invention at its most disadvantageous point in hoisting;

FIG. 16 is a schematic view of the crane at the landing leg of the present invention;

FIG. 17 is a 350t truck crane performance parameter chart of the present invention;

FIG. 18 is a 130t truck crane performance parameter chart of the present invention;

FIG. 19 is a chart of 80t truck crane performance parameters of the present invention;

FIG. 20 is a graph of the mechanical properties of the steel cord of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1-coal yard retaining wall, 2-central column, 3-350t truck crane, 4-portal, 5-80t truck crane, 6-130t truck crane, 7-steel ball net rack, 8-traveling mechanism and 9-track.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

step one, setting a crane station

Hoisting is carried out by adopting four truck cranes, wherein two 350t truck cranes are main cranes, hoisting points of the two truck cranes are arranged at the centers of two arms at the top of the portal (point A, namely the center of the section D at the top of the portal) one above the other and are firmly bound by steel wire ropes respectively, one 130t truck crane is arranged at the position (point B, namely the center of the section A support) close to the center post of the portal, the other 80t truck crane is arranged at the side (point C, namely the center of the section E support) of the portal, each hoisting point is fixed by the steel wire ropes, the hoisting points A, B and C of the portal are respectively made of the steel wire ropes of 6 x 37+1 phi 64mm, the hoisting point A of the portal is respectively made of two steel wire ropes of 6 x 37+1 phi 64mm around the portal single arm for two circles, and a proper steel wire rope is selected to reduce the possibility of breakage during hoisting;

step two, hoisting of the travelling mechanism

step three, portal hoisting test

Firstly, slowly hoisting two cranes of a portal frame under the command of a hoisting crane for 0.5m, lifting the head of the portal frame, slightly lifting the truck crane at the point B by 130t and the truck crane at the point C by 80t to leave the ground, waiting for 10 minutes, checking the stress condition of each stress point, checking whether the hoisting weight of each crane meets the designed hoisting weight requirement or not, checking the stress condition of each binding rope, whether instantaneous stress load exists or not, whether the steel wire rope has distortion or not, and the protection condition of the steel wire rope and a door frame contact, the position of the binding steel wire rope on the door frame is provided with an anti-skid block which comprises a quarter thick-skin steel pipe, the quarter thick-skin steel pipe is welded at the edge of the portal frame, the left end and the right end of the quarter thick-skin steel pipe are both welded with angle steel fixing blocks, the wire rope is prevented from sliding and moving by the anti-skidding stop block (refer to fig. 5 and 6 in the attached drawing of the specification), and the next step of work is carried out after the error is detected;

step four, gantry swivel

fifthly, lifting the gantry in place

The four cranes are matched, under the condition that 350t of the truck crane at the point A is hoisted, the gantry at one side of the point C is lifted first, meanwhile, 130t of the truck crane at the point B is matched, but is not lifted first temporarily, after the gantry end at the point C exceeds a coal yard retaining wall, the lifting is stopped, the gantry is delivered to the outer side of a coal yard until the gantry at the side of the central column at the point B can be sleeved into the central column, the 350t of the truck crane at the point A and the crane at the point B are stably pivoted arms and sleeved into the gantry, the gantry is fixedly connected with the central column, the elevation gantry and the central line are adjusted by the 130t of the truck crane at the point B, the hinged rotating shaft at the side of the central column of the gantry is in place, a welder welds and fixes the truck. And then the truck crane at the point A of 350t is lifted, so that the portal frame at the point C is lifted to exceed the top surface of the travelling mechanism, the truck crane slowly rotates around the portal frame center column, the portal frame is located on the upper plane of the travelling mechanism and is immediately fixed by the fixing bolt, after the portal frame is in place, the positioning bolt is used for timely positioning and fixing the hinged structure according to the hinged position on the side of the center column in the assembly drawing and is timely welded and fixed, the welded joint reaches 100% of the thickness of the steel plate, the portal frame and the travelling mechanism are firmly connected by the permanent bolt according to the assembly drawing, and before the installation work is finished, the crane cannot unhook, so that the hoisting safety is improved (refer to a figure 7 and a figure 8 in the.

The special-shaped part in engineering is usually formed by combining several simple basic graphs, and when the centroid of the special-shaped part is calculated, the special-shaped part can be firstly divided into several basic graphs, and the centroid position can be calculated by utilizing a barycentric coordinate formula.

The centroid coordinate formula for the planar graph is as follows:

where Xc is the distance between the overall centroid coordinates and the Y-axis, Σ Gi × Xi is the product of the weight of the structure of each shape and the distance from the Y-axis, and G is the overall weight of the gantry.

For the present project, since the structure is a special-shaped structure, it can be decomposed into several simple geometric figures, segment A, B, C, D, E, as shown in fig. 9, and the calculation table of Xc is shown in fig. 10.

Load calculation and crane checking calculation

1. As shown in fig. 11: according to the relation between the moment arm and the moment, taking the point B as a fulcrum, the hoisting F1 is stressed:

29.6*F1＝21.47*Q1

F1＝21.47*128.1/29.6＝92.92t

q1 is the weight of the gantry, 128.1 tons.

The span of the whole gantry is 50 m, and according to the relation between the moment arm and the moment, the lifting force F2 is stressed by taking the point C as a fulcrum:

16.5*F1+46.1*F2＝(46.1-21.47)*Q1

F2＝(24.87Q1-17F1)/50＝35.18t

2. when the portal turns, two 350T truck cranes turn, one is close to the inner edge of the bending point of the portal frame, the turning radius is 8m, one is close to the outer edge of the bending point of the portal frame, the turning radius is 8m, and during hoisting, because the 130T truck crane and the 80T truck crane play an auxiliary role, almost no stress is applied, so the weight of the two 350T truck cranes is the weight of the whole portal frame, so the weight g1 of the portal frame hung by a single 350T crane is 128.1 ÷ 2 ÷ 64.05T, so the hoisting load of the single 350T truck crane is:

G₃₅₀＝(g1+g2)*k1*k2＝(64.05+2)*1.1*1.25＝87.186T

g1........... the weight of a suspended gantry

g2.

K1.

K2.

As shown in fig. 12, the length of a 350t truck crane hook is considered to be 1.5 m according to the most adverse factor, a steel wire rope is wound around a gantry and extends out for 1 m, the top point of the gantry is 32.257 m away from the ground, and therefore the maximum lifting height H of the 350t truck crane is 1.5+1+ 32.257-34.757 m.

The arm length of the 350t truck crane can be calculated through the hoisting height and the turning radius as follows:

according to the table checking figure 17, when the slewing radius of the 350T truck crane is 8 meters and the arm length is 36.1 meters, the rated load lifting capacity is 100T >87.186T, and the single-machine load is 64.05 ÷ 100 × 100% ═ 64.05% < 75%, so that two 350T truck cranes selected during the turning over of the gantry and the lifting meet the requirements.

When the slewing radius of the 350t truck crane is 8 meters and the arm length is 36.1 meters, it can be known from fig. 13 and the triangle pythagorean theorem that:

then M is equal to 6.945 and,

according to the triangle theorem, M/(M +32.257-4) is equal to L/R, and L is equal to 1.578M,

the single arm width of the gantry is 0.5m, the thickness of the crane arm is 0.5m, and L-0.5/2-0.5/2 is 1.078>0.5/2, so that the gantry cannot resist the rod.

3. When the portal is hoisted, two 350t truck cranes are used for simultaneously hoisting a portal A point, the two truck cranes are uniformly stressed, two rulers (made of flexible rulers and provided with plumbs at the lower parts) are arranged on two arms of the portal before the portal is hoisted, and when the portal is hoisted slowly, the water level gauge monitors whether the scales of the two rulers are the same or not in the whole process, so that the two cranes are prevented from being stressed unevenly in the hoisting process.

4. Checking calculation of B point crane

The crane at the point B adopts a 130t truck crane, and according to the relationship between the moment arm and the moment, the point C is taken as a fulcrum:

F2＝35.18t

in a table checking chart 18, when the turning radius of the QAY130 is 9 meters and the arm of force of the crane is 21.8 meters, the maximum hoisting weight is 48 tons and more than 35.18 tons, the hoisting requirement is met, and the gantry is safely hoisted.

5. Checking calculation of crane at C point

The crane at the point C adopts an 80t truck crane, the stress is set as F3, and according to the relationship between the moment arm and the moment, the point B is taken as a fulcrum:

F3*46.1+F1*29.6＝Q1*21.47

F3＝128.1*21.47-92.92*29.6/46.1＝0.002t

the crane is almost free from stress, but only has an auxiliary effect, and can only lift 0.1-0.2 m, so that the safety of the crane is ensured.

6. Checking calculation of steel wire rope

The four hoisting points A, B, C adopt steel wire ropes of 6 × 37+ 1-phi 64mm, and the stress of the steel wire ropes at the point A is checked and calculated due to the fact that the stress of the point A is the largest in the hoisting process.

Because a steel wire rope is adopted when each 350t truck crane hoists the portal frame, two end points of the steel wire rope are respectively bound at one side of the portal frame, namely the middle of the top end of the portal frame.

According to the stress, the lifting weight G is 64.05 tons and is borne by two lifting points, and each lifting point bears half of the weight, namely F is G/2 is 32.025 tons.

According to the graph 20, according to F, 32.025 tons, a steel wire rope is selected by looking up a table, the breaking tension P of the steel wire rope 6, 37, 1-phi 64mm is 2860kN, the safety factor K of the steel wire rope 6, 37, 1-phi 64mm is (P/10)/F, 286000/32025 is 8.9, the steel wire rope is used as a binding rope, and the safety factor is 5-8, so that the hoisting requirement is met.

7. Checking calculation of foundation bearing capacity at crane supporting leg

According to the figures 14 and 15, the actual length distance is measured, when the crane jib is positioned above the support leg, the foundation at the support leg bears the maximum pressure, the bearing capacity of the foundation at the moment meets the requirement, and other positions can meet the requirement, so that the bearing capacity of the foundation at the moment can be calculated.

And (3) according to the relation of moment of force arm, the stress F of the foundation at the supporting leg is as follows:

107*3+F*9＝69.71*9

F＝35.6t

the steel plate foot pad is adopted here, and the area is 2.5 x 2.4m²The compressive stress is 35.6t/2.5 x 2.4-5.93 t/m2, the compressive stress of the broken stone foundation is 25-40 tons/m 2 according to relevant documents such as 'permitted pressure-resistant gauge of foundation suitable for coal industrial building', and the foundation meets the requirement!

The bearing capacity of the foundation at the supporting legs is larger than the pressure at the supporting legs, the foundation can be changed by soil, gravels are added, the foundation is compacted, the foundation is changed and filled to the thickness of 0.5m, a layer of road timber is added, and then a special steel backing plate for a crane is used, as shown in figure 16.

Example 2 example of application

Coal conveying island project for 100 million tons of ethylene glycol produced annually by inner Mongolia Jiutai New Material Co., Ltd

Overview of the engineering: a circular coal yard of a coal conveying island of a 100-kiloton ethylene glycol project produced by inner Mongolia Jiutai new material company Limited adopts a circular stockyard stacker-reclaimer produced by Hua-Electricity heavy industry Co. The project constructs 3 round coal yards with the diameter of phi 100m in total, and the height of the coal retaining wall is 16.5 m. The coal storage amount of a single circular coal yard is about 10 multiplied by 104t, the total coal storage amount of 3 circular coal yards is about 30 multiplied by 104t, the coal can be used for about 20 days by a project boiler and a gasification furnace in the current period, the number of coal types is 5 according to the requirements of owners, separate connection, unloading and storage are required to be considered, blending is not allowed, each circular coal yard is considered to be piled up by 2 coal types, and the actual coal storage amount of each circular coal yard is less than 10 multiplied by 104 t. The circular coal yard adopts an operation mode that a stacker and a scraper reclaimer which are separated are stacked and taken to be matched with an underground coal hopper. 1 circular coal yard stacker-reclaimer is arranged in each circular coal yard, the stacker adopts a horizontal cantilever type (without pitching), the reclaimer adopts a portal scraper type, the rated stacker output is 1750t/h, and the rated reclaimer output is 1500 t/h. 1 activation coal feeder is arranged under the central column coal hopper of each round coal yard to serve as coal feeding equipment, a fault place hopper is further arranged in each coal yard, and 1 activation coal feeder is arranged under each coal hopper to serve as a coal feeding standby facility.

Construction conditions are as follows: the engineering construction starts in 5 and 10 months in 2020, two 350t truck cranes are used as main cranes, and the hoisting at the two ends is completed by matching 130t truck cranes and 80t truck cranes, and the construction is completed in 16 days in 5 and 16 months in 2020. The field application and the effect are relatively ideal.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a stacker-reclaimer portal installation special construction process which characterized in that: the method comprises the following steps:

step one, setting a crane station

step two, hoisting of the travelling mechanism

step three, portal hoisting test

step four, gantry swivel

fifthly, lifting the gantry in place

2. The special construction process for installing the gantry of the stacker-reclaimer as recited in claim 1, wherein: in the first step, the hoisting point A, the hoisting point B and the hoisting point C of the portal frame all adopt steel wire ropes of 6X 37+ 1-phi 64mm, and the hoisting point A of the portal frame respectively winds the portal frame by two single-arm circles with the two steel wire ropes of 6X 37+ 1-phi 64 mm.

3. The special construction process for installing the gantry of the stacker-reclaimer as recited in claim 1, wherein: in the third step, an anti-slip stop block is arranged at the position of the binding steel wire rope on the portal frame and comprises a quarter thick-skin steel pipe, the quarter thick-skin steel pipe is welded at the edge of the portal frame, and angle steel fixing blocks are welded at the left end and the right end of the quarter thick-skin steel pipe.

4. The special construction process for installing the gantry of the stacker-reclaimer as recited in claim 1, wherein: and fifthly, after the door frame is in place, positioning bolts are used for timely positioning and fixing the hinged structure according to the hinged position on the side of the central column of the assembly drawing and are timely welded and fixed, the welded joint reaches 100% of the thickness of the steel plate, the door frame and the walking mechanism are firmly connected through permanent bolts according to the assembly drawing, and the crane cannot be unhooked before installation is finished.