CN115749346A - Garage roof load dispersion construction method - Google Patents
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- CN115749346A CN115749346A CN202211377830.7A CN202211377830A CN115749346A CN 115749346 A CN115749346 A CN 115749346A CN 202211377830 A CN202211377830 A CN 202211377830A CN 115749346 A CN115749346 A CN 115749346A
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- 238000010276 construction Methods 0.000 title claims abstract description 57
- 239000006185 dispersion Substances 0.000 title claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 238000009792 diffusion process Methods 0.000 claims abstract description 17
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- 238000004364 calculation method Methods 0.000 claims description 9
- 230000001419 dependent effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005034 decoration Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The application relates to the technical field of garage roof construction, and discloses a garage roof load dispersing construction method. Determining the weight of the cross beam and the specification of the truck crane according to the site construction condition, determining the model of the truck crane and the dead weight and the balance weight of the truck crane according to the specification of the truck crane, and calculating the maximum stress of a supporting leg of the truck crane; selecting the type of earthing and the size of the steel plate under the supporting leg, obtaining a diffusion angle and a volume weight according to the type of the earthing, determining the side length of the steel plate under the supporting leg according to the size of the steel plate under the supporting leg, and determining the load of a crane; obtaining the soil covering load according to the soil covering thickness and the volume weight; determining the load of the structural slab according to the earthing load and the load of the crane, obtaining a relation graph of the load of the structural slab and the earthing thickness, comparing the load of the structural slab with the load of the structural slab, judging whether the load of the structural slab is greater than the load of the structural slab, and obtaining the earthing type, the size of the steel plate under the supporting leg and the earthing thickness. This application has the effect of dispersion garage roof load.
Description
Technical Field
The application relates to the technical field of garage roof construction, in particular to a garage roof load dispersing construction method.
Background
The underground garage penetrating through the field area is usually arranged in the high-rise building group, after the underground garage is built, when the high-rise building is built upwards, the top plate of the garage needs to be used as a temporary road for construction in the construction process of a plurality of steel structure projects, construction is carried out on the top plate of the underground garage, but the bearing capacity of the top plate of the garage is weak, and the lifting construction weight of a truck crane in the high-rise building can not be borne.
The existing common scheme is to reinforce the garage structure, such as a permanent reinforcement original structure method, a support full scaffold and a support steel column method, structural plates, beams or columns are required to be directly reinforced, the reinforcing method is complicated, the pipeline installation or decoration construction of the underground garage is influenced, and the difficulty degree of subsequent construction of projects is increased.
Disclosure of Invention
In order to solve the problem, the application provides a garage roof load dispersing construction method.
The application provides a garage roof load dispersion construction method adopts following technical scheme:
the garage roof load dispersing construction method comprises the following steps:
determining the stress of the supporting leg:
determining the weight of the cross beam and determining the specification of the truck crane according to the site construction condition, wherein the specification of the truck crane comprises the maximum hoisting weight of the truck crane and the arm length of the truck crane;
determining the type of the truck crane and the self weight and the balance weight of the truck crane according to the specification of the truck crane, and calculating the maximum stress pressure of the support leg of the truck crane according to the self weight, the balance weight and the weight of the cross beam of the truck crane;
determining the load of the structural plate:
selecting the type of earthing and the size of the steel plate under the landing leg, obtaining a diffusion angle and a volume weight according to the type of the earthing, determining the side length of the steel plate under the landing leg according to the size of the steel plate under the landing leg, and determining the load of the crane according to the diffusion angle, the side length of the steel plate under the landing leg, the thickness of the earthing and the maximum pressure in the stress condition of the landing leg;
obtaining the soil covering load according to the soil covering thickness and the volume weight;
determining the load of the structural slab according to the earthing load and the load of the crane, and obtaining a relation graph of the load of the structural slab and the earthing thickness, wherein the earthing thickness is an independent variable, and the load of the structural slab is a dependent variable;
a judging step:
comparing the load of the structural plate with the load of the structural plate, judging whether the load of the structural plate is greater than the load of the structural plate, and if so, obtaining the type of earthing, the size of a steel plate under a supporting leg and the thickness of the earthing;
if not, judging whether the size of the steel plate under the common earth covering and the support legs is taken or not, and if not, re-determining the load of the structural plate; if the load bearing of the structural panel is not sufficient to be greater than the load bearing of the structural panel, beam or column needs to be locally reinforced.
By adopting the technical scheme, the load of the structural slab is reduced by covering soil on the top slab of the garage, so that the structural slab can bear the pressure brought in the construction process, the structural slab, the beam or the column in the underground garage does not need to be reinforced, the construction steps are simplified, the pipeline installation or decoration construction of the underground garage is not influenced, and the difficulty degree of the subsequent construction of the project is effectively reduced.
Preferably, in the step of determining the stress of the support legs, the maximum hoisting weight of the truck crane is determined according to the weight requirement of the cross beam, the arm length of the truck crane is determined according to the farthest hoisting distance and the hoisting height, and the truck crane model which can meet the arm length and the maximum hoisting weight is determined by comparing the rated hoisting weight tables of the truck cranes of various models.
Preferably, in the step of determining the stress of the support leg, the method for calculating the maximum stress of the support leg of the truck crane includes:
determining the stress condition of a support leg of the truck crane, and calculating the maximum stress of the support leg on the basis of the stress condition;
maximum pressure of force applied to support leg of truck crane under condition that truck crane does not hoist cross beam
After the truck crane lifts the cross beam and under the condition that any two support legs of the truck crane bear force, the maximum pressure of the stress of the support legs of the truck crane
After the truck crane lifts the cross beam and under the condition that any supporting leg of the truck crane bears the force, the maximum pressure F of the stress of the supporting leg of the truck crane z ＝(m q +n h ) X 10N/KG; wherein m is q Is the dead weight and the balance weight of the truck crane m h The beam weight.
Preferably, the method further comprises the step of determining the covering position:
the stress condition of the support legs of the truck crane and the turning direction of the needed cross beam in the hoisting process are determined, the support legs of the truck crane needing bearing force are placed on the structural beam of the garage roof according to the site structure, the rest support legs are correspondingly placed, covering soil is correspondingly placed under each support leg, and the covering soil placement position is determined according to the support leg position.
Preferably, in the step of determining the load of the structural slab, the type of the covering soil is selected according to the site construction condition, and the length of the side length of the lower steel plate of the selected support leg needs to be larger than the length of the side length of the bottom surface of the support leg.
Preferably, in the step of determining the load of the structural panel, the crane load calculation method includes:
obtaining the side length b of the diffused earthing layer according to the earthing thickness s, the side length b of the steel plate under the supporting leg and the diffusion angle theta cx ＝b+2s×tanθ；
Obtaining the diffused earthing area according to the side length of the diffused earthing
Maximum pressure F according to the force applied to the support leg of a truck crane z And covering soil area after diffusion to obtain crane load
Preferably, in the step of determining the load of the structural slab, the method for calculating the earthing load includes:
earthing load F t = rs × s, where rs is volume weight.
Preferably, the volume weight is 15-20 KN/m 3 。
Preferably, in the step of determining the load of the structural panel, the structural panel load calculation method includes:
structural panel load F j ＝F d +F t 。
Preferably, the device also comprises a horizontal ladder arranged in the middle of the covering soil, the covering soil is arranged below the four support legs of the truck crane, the horizontal ladder is arranged in the middle of the covering soil, one end of the horizontal ladder is arranged to be inclined, and the length of the horizontal ladder is greater than that of the body of the truck crane.
By adopting the technical scheme, the covering soil has a certain height, so the horizontal ladder is arranged and placed in the middle of the covering soil, one end of the horizontal ladder is arranged to be inclined, a car can be driven to near the covering soil along the horizontal ladder, and then the supporting legs of the truck crane are placed down, so that the difficulty of placing the supporting legs of the truck crane on the covering soil is effectively reduced.
In summary, the present application has the following beneficial technical effects:
1. the load of the structural plate is reduced by earthing the top plate of the garage, so that the structural plate can bear the pressure brought in the construction process, the structural plate, the beam or the column in the underground garage does not need to be reinforced, the construction steps are simplified, the pipeline installation or decoration construction of the underground garage is not influenced, and the difficulty degree of the subsequent construction of the project is effectively reduced.
2. The earthing has the take the altitude, so set up the horizontal ladder and place in the middle of the earthing, horizontal ladder one end sets to the slope form, can make the car open near the earthing along the horizontal ladder, puts down the truck crane landing leg again, the effectual degree of difficulty that has reduced the truck crane landing leg and place the earthing.
Drawings
Fig. 1 is a flow chart of the garage roof load dispersion construction method of the application.
FIG. 2 is a graph showing the relationship between the load of the structural slab and the thickness of the covering soil in the embodiment of the garage roof load dispersion construction method.
Fig. 3 is an overall view of the garage roof load dispersion construction method.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a garage roof load dispersing construction method. Referring to fig. 1, the construction method includes a step of determining a stress of a support leg, a step of determining a position of a covering soil, a step of determining a load of a structural slab, and a step of judging.
The step of determining the stress of the supporting leg comprises the following steps:
according to the site construction conditions, the beam weight is determined, and the specification of the truck crane is determined, wherein the specification of the truck crane comprises the maximum hoisting weight of the truck crane and the arm length of the truck crane. Determining the maximum hoisting weight of the truck crane according to the weight requirement of the cross beam, determining the arm length of the truck crane according to the farthest hoisting distance and the hoisting height, and determining the truck crane model which can meet the arm length and the maximum hoisting weight by comparing the rated hoisting weight tables of the truck cranes of various models.
Specifically, the type of the truck crane, the self weight and the balance weight of the truck crane are determined according to the specification of the truck crane, and the maximum stress of the supporting leg of the truck crane is calculated according to the self weight, the balance weight and the weight of the cross beam of the truck crane.
The method for calculating the maximum stress of the support leg of the truck crane specifically comprises the following steps:
determining the stress condition of a support leg of the truck crane, and calculating the maximum stress of the support leg stress based on the stress condition;
maximum pressure of force applied to support leg of truck crane under condition that truck crane does not hoist cross beam
After the truck crane lifts the cross beam and under the condition that any two support legs of the truck crane bear force, the maximum pressure of the stress of the support legs of the truck crane
After the truck crane lifts the cross beam and under the condition that any supporting leg of the truck crane bears the force, the maximum pressure F of the stress of the supporting leg of the truck crane z ＝(m q +m h ) X 10N/KG; wherein m is q For truck crane dead weight + counterweight, m h The beam weight.
For example, assuming that the maximum weight of the beam to be lifted is 18.65 tons, the farthest lifting distance to be lifted is 18.4 meters, and the lifting height is 21 meters according to the construction conditions, the arm length of the truck crane can be obtained by the pythagorean theorem, and the arm length cannot be less than 28 meters. That is to say, when the working amplitude is more than 18.4 meters and the arm length is more than 28 meters, the truck crane with the hoisting weight not less than 18.65 tons can meet the requirement, and finally the 130-ton truck crane is selected by comparing the rated hoisting weight tables of various types of truck cranes.
After the model of the truck crane is determined, the self weight and the counterweight of the truck crane can be determined, the self weight of the 130-ton truck crane is 54 tons, and the counterweight is 34 tons, so that the maximum stress of the supporting leg of the truck crane can be calculated.
When the cross beam is not hoisted, four support legs are simultaneously stressed, and then
When the cross beam is transferred between the two support legs in the hoisting process and the two support legs bear force, the cross beam is lifted
When the cross beam is transferred to the upper part of one supporting leg in the hoisting process and bears the force by one supporting leg, F is z ＝(54+34+18.65)×1θ＝1066.5KN。
The step of determining the position of the covering soil comprises the following steps:
the stress condition of the support legs of the truck crane and the turning direction in the required beam hoisting process are determined, the beam hoisting is a process, after the beam is hoisted, the hoisting arm of the truck crane drives the beam to rotate around the truck crane, the hoisting arm stays at the middle part of the two support legs of the truck crane, and the two support legs of the truck crane which are closest bear the same force at the same time; in the process of turnover, the lifting arm of the truck crane rotates to the position above any truck crane supporting leg, so that the truck crane supporting leg bears the whole pressure of the cross beam, and only the truck crane supporting leg bears the force.
Placing the support legs of the truck crane needing bearing force on the structural beam of the garage roof plate according to the site structure, correspondingly placing the rest support legs, correspondingly placing the earthing soil below each support leg, and determining the earthing soil placing position according to the support leg position.
In the above case, according to the field construction condition, the distance between the 130-ton truck crane support legs is 8 meters, and the distance between the underground garage structural beams is 8.1 meters, so that the four support legs cannot be completely placed on the structural beams, and therefore when the cross beam is hoisted, two support legs playing a bearing role are placed on the structural beams, and the rest two support legs are correspondingly placed according to the distance between the support legs. After the positions of the supporting legs are determined, the position of the soil covering can be obtained, and the soil covering is placed below each supporting leg.
And the step of determining the load of the structural slab comprises the steps of selecting the type of earthing and the size of the steel plate under the landing leg, obtaining a diffusion angle and a volume weight according to the type of the earthing, and determining the side length of the steel plate under the landing leg according to the size of the steel plate under the landing leg, wherein the type of the earthing needs to be selected according to the field construction condition, and the length of the side length of the steel plate under the landing leg needs to be larger than that of the bottom surface of the landing leg.
And determining the load of the crane according to the diffusion angle, the side length of the lower steel plate of the supporting leg, the thickness of the covering soil and the maximum pressure in the stress condition of the supporting leg.
It should be noted that the spread angle is related to the mechanical properties of the casing, is an uncertain and wide range of values, generally ranges from 20 degrees to 60 degrees, and needs to be determined by the operator according to the kind of casing and construction experience. The covering soil thickness is a numerical value which is manually specified according to construction experience and is continuously changed, different crane loads can be obtained by changing different covering soil thicknesses, and the optimal covering soil thickness is found according to the obtained crane loads.
The crane load calculation method comprises the following steps:
according to the earthing thickness s, the side length b of the lower steel plate of the supporting leg and the diffusion angle theta, obtaining the side length b of the earthing after diffusion cx ＝b+2s×tanθ；
Obtaining the diffused earthing area according to the side length of the diffused earthing
Maximum pressure F according to the stress of the support leg of the truck crane z And covering soil area after diffusion to obtain crane load
Obtaining the earth covering load according to the earth covering thickness and the volume weight;
the earthing load calculation method comprises the following steps: earthing load F t = rs x s, wherein rs is volume weight, and the value of the volume weight is 15-20 KN/m 3 。
Determining the load of the structural slab according to the earthing load and the load of the crane, wherein the structural slab load calculation method comprises the following steps: structural panel load F j ＝F d +F t . And obtaining a relation graph of the load of the structural plate and the soil covering thickness, wherein the soil covering thickness is an independent variable, and the load of the structural plate is a dependent variable.
When the soil covering is selected, since a large amount of soil covering may be required for construction, the unit price of soil covering per square meter of an unusual soil covering variety is more expensive than that of a common soil covering variety, and most of allThe construction cost is increased, so the most common earthing soil for the garage roof backfilling in the construction is generally selected, and the volume weight of the most common earthing soil for the garage roof is generally 15-20 KN/m 3 Therefore, 16KN/m is adopted in the scheme 3 Volume weight of (1), 16KN/m 3 The soil spread angle of the volume weight was 45 degrees. The size of the steel plate under the supporting leg is also a common size, the steel plate under the supporting leg is placed on the earthing soil, the length of the side length of the selected steel plate needs to be larger than that of the bottom surface of the supporting leg, and the supporting leg is effectively prevented from being sunk into the earthing soil due to the pressure of a truck crane, so that the size of the steel plate under the supporting leg is 0.5m multiplied by 0.5m, and the side length of the steel plate under the supporting leg is 0.5 m.
Therefore, the soil covering area after diffusion is
According to the step of determining the maximum stress of the supporting leg as F max ＝F y =1066.5KN, so the crane load is
The soil covering load is F t =16s, structural panel load of
Therefore, a calculation formula with the soil covering thickness as an independent variable and the structural plate load as a dependent variable is obtained, a relation graph of the structural plate load and the soil covering thickness can be obtained according to the formula, as shown in fig. 2, the size of the structural plate load is clearly expressed, and when the soil covering thickness is 1.6 m, the structural plate load is reduced by 78% compared with the structural plate load when the soil covering thickness is 0.5 m.
The judging step comprises:
comparing the load of the structural plate with the load of the structural plate, judging whether the load of the structural plate is greater than the load of the structural plate, and if so, obtaining the type of earthing, the size of a steel plate under a supporting leg and the thickness of the earthing;
if not, judging whether the size of the steel plate under the common earth covering and the support legs is taken or not, and if not, re-determining the load of the structural plate; if the load bearing of the structural panel is not sufficient to be greater than the load bearing of the structural panel, beam or column needs to be locally reinforced.
It should be noted that the structural slab load bearing is determined after the underground garage is constructed, and the structural slab load bearing is related to the material and spacing of the structural slabs, beams or columns in the garage, and needs to be confirmed with the garage construction side. Because the construction time of the common garage is close to that of a high-rise building, and the time interval is not long, the bearing data of the structural plates can be kept at the garage construction side.
And when the load bearing of the structural plate can not be larger than the load of the structural plate, the existing reinforcing mode is adopted when the structural plate, the beam or the column is locally reinforced.
Referring to fig. 3, because the earthing has the take-up and has the take-up leg and be difficult for placing on the earthing, so set up the horizontal ladder and place in the middle of the earthing, horizontal ladder one end sets up the slope form, and horizontal ladder length needs be greater than truck crane automobile body length, can make the car open near the earthing along the horizontal ladder, puts down the truck crane landing leg again, the effectual degree of difficulty that has reduced the truck crane landing leg and place on the earthing.
The implementation principle of the garage roof load dispersion construction method in the embodiment of the application is as follows: determining the weight of the cross beam according to the site construction condition, and determining the specification of the truck crane, wherein the specification of the truck crane comprises the maximum hoisting weight of the truck crane and the arm length of the truck crane; and determining the type of the truck crane and the self weight and the balance weight of the truck crane according to the specification of the truck crane, and calculating the maximum stress of the supporting leg of the truck crane according to the self weight, the balance weight and the weight of the cross beam of the truck crane.
Selecting the type of earthing and the size of the steel plate under the supporting leg, obtaining a diffusion angle and a volume weight according to the type of earthing, determining the side length of the steel plate under the supporting leg according to the size of the steel plate under the supporting leg, and determining a crane load according to the diffusion angle, the side length of the steel plate under the supporting leg, the thickness of the earthing and the maximum pressure in the stress condition of the supporting leg; and obtaining the soil covering load according to the soil covering thickness and the volume weight.
Determining the load of the structural slab according to the earthing load and the load of the crane, and obtaining a relation graph of the load of the structural slab and the earthing thickness, wherein the earthing thickness is an independent variable, and the load of the structural slab is a dependent variable.
Comparing the load of the structural plate with the load of the structural plate, judging whether the load of the structural plate is greater than the load of the structural plate, and if so, obtaining the type of earthing, the size of a steel plate under a supporting leg and the thickness of the earthing; if not, judging whether the size of the steel plate under the common earth covering and the support legs is taken or not, and if not, re-determining the load of the structural plate; if the load bearing of the structural panel is not sufficient to be greater than the load bearing of the structural panel, beam or column needs to be locally reinforced.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A garage roof load dispersing construction method is characterized by comprising the following steps:
determining the stress of the supporting leg:
determining the weight of the cross beam according to the site construction condition, and determining the specification of the truck crane, wherein the specification of the truck crane comprises the maximum hoisting weight of the truck crane and the arm length of the truck crane;
determining the type of the truck crane and the self weight and the balance weight of the truck crane according to the specification of the truck crane, and calculating the maximum stress pressure of the support leg of the truck crane according to the self weight, the balance weight and the weight of the cross beam of the truck crane;
determining the load of the structural plate:
selecting the type of earthing and the size of the steel plate under the landing leg, obtaining a diffusion angle and a volume weight according to the type of the earthing, determining the side length of the steel plate under the landing leg according to the size of the steel plate under the landing leg, and determining the load of the crane according to the diffusion angle, the side length of the steel plate under the landing leg, the thickness of the earthing and the maximum pressure in the stress condition of the landing leg;
obtaining the soil covering load according to the soil covering thickness and the volume weight;
determining the load of the structural slab according to the earthing load and the load of the crane, and obtaining a relation graph of the load of the structural slab and the earthing thickness, wherein the earthing thickness is an independent variable, and the load of the structural slab is a dependent variable;
a judging step:
comparing the load of the structural plate with the load of the structural plate, judging whether the load of the structural plate is greater than the load of the structural plate, and if so, obtaining the type of earthing, the size of a steel plate under a supporting leg and the thickness of the earthing;
if not, judging whether the size of the steel plate under the common earth covering and the support legs is taken or not, and if not, re-determining the load of the structural plate; if the load bearing of the structural panel is not sufficient to be greater than the load bearing of the structural panel, beam or column needs to be locally reinforced.
2. The garage roof load dispersion construction method according to claim 1, characterized in that: in the step of determining the stress of the support legs, the maximum hoisting weight of the truck crane is determined according to the weight requirement of the cross beam, the arm length of the truck crane is determined according to the farthest hoisting distance and the hoisting height, and the truck crane model which can meet the arm length and the maximum hoisting weight is determined by comparing the rated hoisting weight tables of the truck cranes of various models.
3. The garage roof load dispersion construction method according to claim 1, characterized in that: in the step of determining the stress of the support leg, the method for calculating the maximum stress of the support leg of the truck crane specifically comprises the following steps:
determining the stress condition of a support leg of the truck crane, and calculating the maximum stress of the support leg stress based on the stress condition;
maximum pressure of force applied to support leg of truck crane under condition that truck crane does not hoist cross beam
Hoisting at truck craneThe maximum pressure of the stress of the support legs of the truck crane is realized after the cross beam and under the condition that any two support legs of the truck crane bear the force
After the truck crane lifts the cross beam and under the condition that any supporting leg of the truck crane bears the force, the maximum pressure F of the stress of the supporting leg of the truck crane z ＝(m q +m h ) X 10N/KG; wherein m is q For truck crane dead weight + counterweight, m h The beam weight.
4. The garage roof load dispersion construction method according to claim 1, characterized in that: further comprising the step of determining the position of the covering soil:
the stress condition of the support legs of the truck crane and the turning direction of the needed cross beam in the hoisting process are determined, the support legs of the truck crane needing bearing force are placed on the structural beam of the garage roof according to the site structure, the rest support legs are correspondingly placed, covering soil is correspondingly placed under each support leg, and the covering soil placement position is determined according to the support leg position.
5. The garage roof load dispersion construction method according to claim 1, characterized in that: in the step of determining the load of the structural slab, the type of the earthing soil is selected according to the site construction condition, and the length of the side length of the lower steel plate of the selected support leg needs to be larger than that of the bottom surface of the support leg.
6. The garage roof load dispersion construction method according to claim 3, characterized in that: in the step of determining the load of the structural slab, the crane load calculation method comprises the following steps:
obtaining the side length b of the diffused earthing layer according to the earthing thickness s, the side length b of the steel plate under the supporting leg and the diffusion angle theta cx ＝b+2s×tanθ；
Obtaining the diffused earthing area according to the side length of the diffused earthing
Maximum pressure F according to the force applied to the support leg of a truck crane z And covering soil area after diffusion to obtain crane load
7. The garage roof load dispersion construction method according to claim 6, characterized in that: in the step of determining the load of the structural slab, the earthing load calculation method comprises the following steps:
earthing load F t = rs × s, where rs is volume weight.
8. The garage roof load dispersion construction method according to claim 7, characterized in that: the volume weight is 15-20 KN/m 3 。
9. The garage roof load dispersion construction method according to claim 7, characterized in that: in the step of determining the load of the structural slab, the structural slab load calculation method includes:
structural panel load F j ＝F d +F t 。
10. The garage roof load dispersion construction method according to claim 1, characterized in that: the automobile crane is characterized by further comprising a horizontal ladder arranged in the middle of the covering soil, the covering soil is arranged below the four supporting legs of the automobile crane, the horizontal ladder is arranged in the middle of the covering soil, one end of the horizontal ladder is arranged to be inclined, and the length of the horizontal ladder is larger than that of the body of the automobile crane.
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