CN117549027A - Installation system and installation method for installing rear pull rod of crane - Google Patents

Abstract

The invention provides a mounting system and a mounting method for a rear pull rod of a crane, wherein the crane comprises a rear girder, a land side upper beam connected above the rear girder and a ladder frame, rear girder node plates are arranged at the joint of the rear girder and the land side upper beam and close to two adjacent sides of the ladder frame, the land side of the ladder frame is provided with the ladder frame node plates, and the mounting system comprises an auxiliary platform and a positioning tool. The auxiliary platform comprises: the first auxiliary platform is arranged on the land side of the trapezoid frame surrounding the trapezoid frame node plate and is used for assisting the connection between the top of the rear pull rod and the trapezoid frame; the second auxiliary platform is arranged on one side of the rear girder, which is close to the rear girder node plate, and is used for assisting the connection between the bottom of the rear pull rod and the rear girder. According to the installation system and the installation method provided by the embodiment of the invention, the safety and the construction efficiency can be ensured, and the benefit is considered.

Description

Installation system and installation method for installing rear pull rod of crane

Technical Field

The invention relates to the technical field of installation of large port machinery, in particular to an installation system and an installation method for installing a rear pull rod of a crane.

Background

The rear pull rod of the trapezoid frame of the large port crane is a main component part of a port crane door frame structure, and forms a triangular stable structure together with the sea-land side upper cross beam, the rear girder and the trapezoid frame, so that the rated load capacity of the crane trolley is transferred to the door frame structure together while the stability of the upper structure is maintained.

In order to meet the requirements of stress intensity and rigidity of the rear pull rod of the crane ladder frame and simultaneously lighten dead weight, the cross section shape of the rear pull rod is generally a round cross section, the self-made spiral pipe is spliced and formed, the diameter range is 1000-1100mm, the length range is about 30-45 m, the slenderness ratio is more than 30, the lifting height is 30-55 m, and the lifting weight range is as follows: 10-20 t/root, installation angle range: the included angle between the water and the horizontal plane is 30-45 degrees. The connection mode of the rear pull rod, the ladder frame and the rear girder is usually a welding mode, and the high-altitude site positioning and welding requirements are high.

In the installation process, the rear pull rod with the slenderness ratio more than 30 is usually lifted by only one lifting point, the rear pull rod is easy to bend after being lifted, and the mode of simultaneously inserting the rear girder node plate and the trapezoid frame node plate is adopted, so that the installation time is long and the precision is not high. The whole installation, welding, inspection and verification processes also need to be matched with the climbing vehicle for installation, so that time and labor are wasted, the efficiency is low, and the operator has higher safety risk in construction on the climbing vehicle.

Disclosure of Invention

In view of the above, the invention provides a mounting system for mounting a rear pull rod of a crane, which can ensure safety and construction efficiency and has benefits.

The invention also provides an installation method with the installation system.

In order to solve the technical problems, the invention adopts the following technical scheme:

according to an embodiment of the first aspect of the present invention, a mounting system for mounting a rear tie rod of a crane, the crane including a rear girder, a land side upper beam connected above the rear girder, and a ladder frame, wherein a rear girder node plate is provided at a junction of the rear girder and the land side upper beam near adjacent two sides of the ladder frame, the land side of the ladder frame is provided with a ladder frame node plate, the mounting system includes an auxiliary platform, the auxiliary platform includes:

the first auxiliary platform is arranged on the land side of the trapezoid frame surrounding the trapezoid frame node plate and is used for assisting connection between the top of the rear pull rod and the trapezoid frame;

the second auxiliary platform is arranged on one side, close to the rear girder node plate, of the rear girder and is used for assisting connection between the bottom of the rear pull rod and the rear girder.

Further, the first auxiliary platform is formed into a 'concave' frame structure with plates covered on the bottom and the outer side and surrounding reinforcing ribs, and the 'concave' frame structure is arranged to surround the trapezoid frame node plates;

the inner side of the concave frame structure is provided with a guardrail so that an operator can measure the installation data of the upper end of the rear pull rod.

Further, the second auxiliary platform is formed in a rectangular frame structure having an opening at the top and a plate covered at the bottom so that an operator can measure the installation data of the lower end of the rear drawbar.

Further, the first auxiliary platforms comprise a pair of first auxiliary platforms which are respectively arranged at two ends of the land side of the trapezoid frame surrounding the trapezoid frame node plate;

the rear girder comprises a pair, the second auxiliary platforms also comprise a pair, and the pair of the second auxiliary platforms are correspondingly arranged on two opposite sides of the pair of the rear girders, which are close to the rear girder node plates;

one or more wing plates which are formed into a hook shape are respectively arranged on one side of the land side of the ladder frame and one side of the land side upper cross beam, which is close to the rear girder node plate, one end of the first auxiliary platform, which is connected with the land side of the ladder frame, and one end of the second auxiliary platform, which is connected with one side of the land side upper cross beam, which is close to the rear girder node plate, are provided with one or more connecting pieces, one or more connecting pieces are provided with connecting holes, and the wing plates penetrate through the connecting holes to fix the first auxiliary platform and the second auxiliary platform;

and one side of the rear girder is also provided with a supporting rod for supporting the second auxiliary platform.

Further, the mounting system further comprises a positioning fixture arranged on the rear girder node plate and the trapezoid frame node plate to limit the up-down/left-right position of the rear pull rod.

Further, the positioning fixture comprises a plurality of positioning fixtures, the plurality of positioning fixtures are formed into blocks and are made of magnetic materials so as to adjust the installation positions of the plurality of positioning fixtures according to the drawing, and then the installation positions of the rear pull rods are adjusted.

An installation method for installing a rear pull rod of a crane according to an embodiment of a second aspect of the present invention includes an installation system for installing a rear pull rod of a crane according to the embodiment of the first aspect described above, the installation method including:

step S1, correspondingly mounting an auxiliary platform to a ladder frame and a rear girder;

s2, hoisting a ladder-shaped frame provided with the auxiliary platform;

and S3, installing the rear pull rod to the rear girder node plate and the trapezoid frame node plate.

Further, the installation system further includes a positioning tool, and the S1 includes:

step S11, respectively installing a pair of first auxiliary platforms to two land-side ends of the ladder frame surrounding the ladder frame node plate;

step S12, respectively installing a pair of second auxiliary platforms to two sides of the rear girder, which are close to the rear girder node plate;

and S13, respectively installing a plurality of positioning tools on the rear girder node plate and the trapezoid frame node plate.

Further, the step S3 includes:

s31, installing a wind vibration resistant cable pulling lug plate and determining left and right installation positions of the rear pull rod according to the wind vibration resistant cable pulling lug plate;

s32, determining the upper and lower mounting positions of the rear pull rod according to the sizes of the two ends of the rear pull rod;

step S33, configuring a hoisting steel wire rope with a short length and a long length;

step S34, using a flowing machine to cooperate with the hoisting steel wire rope to slowly lift the rear pull rod until the installation angle of the rear pull rod is larger than the design angle;

step S35, lifting the rear pull rod to an installation position, slowly descending a lifting hook, determining the installation position of the rear pull rod according to a positioning tool on the rear girder node plate, and inserting the rear girder node plate;

and S36, slowly descending the lifting hook, determining the mounting position of the rear pull rod according to the positioning tool on the trapezoid frame node plate, and inserting the rear pull rod into the trapezoid frame node plate.

Further, the step S3 further includes: s37, checking the mounting position and the stress hole position of the rear pull rod, and welding after confirming that the mounting position and the stress hole position are correct; the step S37 includes:

step S371, measuring the distance between two opposite sides of the section where the rear tie rod is located and two opposite ends of the rear girder node plate, which are respectively close to the two opposite sides, of the rear girder node plate, and respectively marking as e1 and e2;

step S372, measuring the distance between two opposite sides of the section where the trapezoid frame node plate is located and two opposite ends, close to the two opposite sides, of the trapezoid frame node plate respectively, of the rear pull rod, wherein the distances are respectively marked as f1 and f2;

step S373, controlling the distances e1, e2, f1 and f2 according to the drawing, and adjusting the left and right positions of the rear pull rod;

step S374, measuring a diameter difference between a central axis of the rear girder node plate inserted into a bottom stress hole of the rear pull rod and the stress hole, and marking g1, measuring a diameter difference between a central axis of the trapezoid frame node plate inserted into a top stress hole of the rear pull rod and the stress hole, marking g2, and controlling the distances g1 and g2 according to a drawing so as to adjust the layout of the positions in the stress holes;

and step S375, respectively performing welding installation of the rear pull rod and the rear girder node plate and welding installation of the rear pull rod and the trapezoid frame node plate based on the left and right position adjustment and the position adjustment in the stress hole.

The technical scheme of the invention has at least one of the following beneficial effects:

the rear pull rod mounting system for mounting the crane comprises an auxiliary platform, wherein the auxiliary platform comprises a first auxiliary platform and a second auxiliary platform. The first auxiliary platform is arranged on the land side of the ladder frame surrounding the ladder frame node plate and used for assisting connection between the top of the rear pull rod and the ladder frame, and the second auxiliary platform is arranged on one side of the rear girder close to the rear girder node plate and used for assisting connection between the bottom of the rear pull rod and the rear girder. Therefore, the difficulty of installation and welding is effectively reduced, the auxiliary platform can be reused, the production and manufacturing cost is saved, the safety and the construction efficiency can be ensured when the rear pull rod of the crane is installed, and meanwhile, the benefit is considered.

Furthermore, the mounting system for mounting the rear pull rod of the crane further comprises a positioning tool used for guiding and positioning the rear pull rod on the girder node plate and the land side node plate of the ladder frame, and can effectively guarantee mounting accuracy.

In addition, the embodiment of the invention also provides a mounting method comprising the mounting system, and the mounting precision and the mounting efficiency of the rear pull rod are further improved.

Drawings

FIG. 1 (a) is a schematic view of the installation arrangement of a first auxiliary platform in the installation system for installing a rear drawbar of a crane according to an embodiment of the invention, FIG. 1 (b) is an A-direction view denoted in FIG. 1 (a), and FIG. 1 (C) is a C-direction cross-sectional view denoted in FIG. 1 (a);

fig. 2 (a) is a schematic diagram of an installation arrangement of a second auxiliary platform in the installation system according to the embodiment of the present invention, fig. 2 (B) is an a-direction view denoted in fig. 2 (a), fig. 2 (C) is a B-direction view denoted in fig. 2 (a), and fig. 2 (d) is a C-direction view denoted in fig. 2 (a);

FIG. 3 (a) is a schematic view of a first auxiliary platform in a mounting system according to an embodiment of the present invention, wherein FIG. 3 (b) is an A-direction view labeled in FIG. 3 (a);

fig. 4 (a) is a schematic view of lifting a second auxiliary platform in the installation system according to the embodiment of the present invention, and fig. 4 (b) is an enlarged schematic view of the position i marked in fig. 4 (a);

fig. 5 (a) is a schematic diagram of an overall installation of the installation system according to the embodiment of the present invention, wherein the installation system is a front view, fig. 5 (b) is an enlarged schematic diagram at i marked in fig. 5 (a), and fig. 5 (c) is an enlarged schematic diagram at ii marked in fig. 5 (a);

FIG. 6 (a) is a schematic diagram showing the left and right mounting positions of the rear tie rod according to the wind vibration resistant tab plate in the mounting method according to the embodiment of the present invention, and FIG. 6 (b) is an E-direction view marked in FIG. 6 (a);

fig. 7 (a) is a schematic diagram of starting hoisting of the hoisting post-pull rod in the installation method according to the embodiment of the invention, and fig. 7 (b) is a schematic diagram of ending hoisting of the hoisting post-pull rod in the installation method according to the embodiment of the invention;

FIGS. 8 (a) to 8 (e) are views illustrating a process of installing a pull rod after being hoisted by using a flow machine according to an embodiment of the present invention;

fig. 9 (a) is a schematic diagram of inspection before welding of a rear tie rod in an installation method according to an embodiment of the present invention, fig. 9 (b) is an enlarged schematic diagram at i marked in fig. 9 (a), fig. 9 (c) is an enlarged schematic diagram at ii marked in fig. 9 (a), fig. 9 (d) is an a-direction view marked in fig. 9 (b), and fig. 9 (e) is an a-direction view marked in fig. 9 (c).

Reference numerals: 100. a rear girder; 110. a rear girder node plate; 120. a support rod;

200. a land side upper beam;

300. a ladder-shaped frame; 310. a trapezoid frame node plate;

400. a rear pull rod; 410. wind vibration resistant pull tab plate; 420. stress holes;

500. an auxiliary platform; 510. a first auxiliary platform; 511. guard bars; 520. a second auxiliary platform; 530. a wing plate; 540. a connecting piece;

600. positioning a tool;

700. a wire rope;

800. a flow machine;

900. and (5) an automobile crane.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.

The following describes a mounting system and a mounting method for mounting a rear stay of a crane according to an embodiment of the present invention in detail with reference to the accompanying drawings.

As shown in fig. 1 (a) to 5 (a), a mounting system for mounting a rear drawbar of a crane according to an embodiment of the present invention, the crane includes a rear girder 100, a land side upper beam 200 connected above the rear girder 100, and a ladder frame 300, wherein a rear girder node plate 110 is provided at a junction of the rear girder 100 and the land side upper beam 200 near adjacent sides of the ladder frame 300, a ladder frame node plate 310 is provided at a land side of the ladder frame 300, the mounting system includes an auxiliary platform 500, and the auxiliary platform 500 includes: a first auxiliary platform 510 and a second auxiliary platform 520. Wherein the first auxiliary platform 510 is provided at a land side of the ladder 300 surrounding the ladder node plate 310 for assisting the connection between the top of the rear tie rod 400 and the ladder 300. The second auxiliary platform 520 is provided at one side of the rear girder 100 near the rear girder node plate 110, and is used for assisting the connection between the bottom of the rear drawbar 400 and the rear girder 100.

Specifically, referring to fig. 1 (a) to 2 (d), when the rear tie rod 400 of the crane is installed, the first auxiliary platform 510 may be installed to the land side of the ladder frame 300 surrounding the ladder frame node plate 310, so that when the rear tie rod 400 is hoisted and connected with the ladder frame 300, i.e., the top of the rear tie rod 400 is inserted into the ladder frame node plate 310, an operator may stand on the first auxiliary platform 510 to determine the connection position of the ladder frame node plate 310 and the top of the rear tie rod 400 according to the drawing and timely measure and adjust the relevant positioning and installation welding data, which is beneficial to reducing the difficulty of high-altitude field positioning to further reduce the installation difficulty and improve the working efficiency. Likewise, the second auxiliary platform 520 can be mounted on one side of the rear girder 100, which is close to the rear girder node plate 110, so that when the rear drawbar 400 is hoisted and connected with the rear girder 100, namely, the bottom of the rear drawbar 400 is inserted into the rear girder node plate 110, an operator can stand on the second auxiliary platform 520 to determine the connection position of the rear girder node plate 110 and the bottom of the rear drawbar 400 according to drawings and timely measure and adjust relevant positioning and mounting and welding data, and the auxiliary platform 500 comprises the first auxiliary platform 510 and the second auxiliary platform 520 on the ladder frame 300 and the rear girder 100 of the crane, so that the difficulty of mounting and welding is effectively reduced, the production and manufacturing cost is saved, the climbing car is not required to be used for matching and mounting in the whole mounting, welding, checking and checking processes of the rear drawbar 400 of the crane, safety and construction efficiency are ensured, and benefits are considered.

In some embodiments of the present invention, referring to fig. 1 (a) to 1 (c), the first auxiliary platform 510 is formed as a "concave" type frame structure covered with a plate material at the bottom and the outside and surrounding with reinforcing ribs, and the "concave" type frame structure is disposed around the ladder node plate 310. The inner side of the "concave" type frame structure is provided with a guard rail 511 so that an operator measures the installation data of the upper end of the rear drawbar 400.

Specifically, in the process of actually installing the rear pull rod 400 of the crane, the trapezoid frame node plate 310 is usually located at the middle position of the concave frame structure, and the concave opening is consistent with the trapezoid frame node plate 310, so that an operator can conveniently measure, adjust, timely observe and feed back the installation connection condition, and reduce the difficulty of high-altitude installation welding.

In addition, the frame construction can provide reliable support connection, and the strengthening rib and the bottom of surrounding and outside panel that cover have further strengthened the structural strength of first auxiliary platform 510, ensure its stability in the installation, and inside still is provided with guardrail 511 and reduces the danger of aerial work when not influencing operating personnel action.

In some embodiments of the present invention, referring to fig. 2 (a) to 2 (d), the second auxiliary platform 520 is formed as a rectangular frame structure with an open top and a plate covered at the bottom so that an operator measures the installation data of the lower end of the rear link 400. That is, as shown in fig. 2 (a), the second auxiliary platform 520 provided at one side of the rear girder 100 near the rear girder node plate 110 actually only needs to measure and observe the installation data of the outer side of the rear girder 100, but the installation data of the inner side of the rear girder 100 may be directly observed at the rear girder 100 by the operator who works at high altitude, if necessary. Therefore, the cost is further saved, the difficulty of installation can be effectively reduced, and the installation efficiency is improved.

In some embodiments of the present invention, referring to fig. 1 (a) and 2 (a), the first auxiliary platforms 510 include a pair, and the pair of first auxiliary platforms 510 are respectively provided at both land-side ends of the ladder 300 surrounding the ladder node plate 310. The rear girder 100 includes a pair, the second auxiliary platform 520 includes a pair, and the pair of second auxiliary platforms 520 are correspondingly disposed on opposite sides of the pair of rear girders 100 near the rear girder-node plate 110. Referring to fig. 1 (b) and 2 (b), one or more wing plates 530 formed in a hook shape are respectively provided at the land side of the ladder frame 300 and the side of the land side upper beam 200 near the rear girder node plate 110, one or more connection members 540 are provided at one end of the first auxiliary platform 510 connected to the land side of the ladder frame 300 and one end of the second auxiliary platform 520 connected to the side of the land side upper beam 200 near the rear girder node plate 110, connection holes are formed in the one or more connection members 540, and the wing plates 530 pass through the connection holes to fix the first auxiliary platform 510 and the second auxiliary platform 520. Referring to fig. 2 (c), a support bar 120 is further provided at one side of the rear girder 100 to provide support for the second auxiliary platform 520.

Here, the pair of second auxiliary platforms 520 are provided on both sides of the rear girder 100 near the rear girder-node plates 110, that is, may be provided on the outside or the inside, and are actually determined according to the positions where the rear girder-node plates 110 are distributed. For example, referring to fig. 2 (a), in the embodiment of the present application, the rear girder node plate 110 is disposed on the outer side of the rear girder 100, and then the second auxiliary platforms 520 are also disposed on the outer side of the rear girder 100, and on the side of the rear girder 100 facing inwards, the second auxiliary platforms 520 are installed on both sides according to the actual situation of the rear girder 100, that is, there are four second auxiliary platforms 520 corresponding to a pair of rear girders 100, or there may be only two second auxiliary platforms 520 corresponding to a pair of rear girders 100. In addition, it should be additionally noted that, for the hook-shaped wing plates 530 formed correspondingly on the land side of the ladder frame 300 and on both sides of the rear girder 100, it is necessary to further weld the wing plates 530 and the connecting members 540 at the positions of the connecting holes after correspondingly penetrating the connecting holes with the connecting members 540 so as to improve structural stability. The installation is simple, stable and reliable.

In some embodiments of the present invention, referring to fig. 5 (a) to 5 (c), the installation system further includes a positioning fixture 600, and particularly as shown in fig. 5 (b) and 5 (c), the positioning fixture 600 is disposed on the rear girder node plate 110 and the ladder node plate 310 to define the up/down/left/right positions of the rear drawbar 400. In the process of installing the rear tie rod 400, an operator can make marks at the installation positions of the rear girder node plate 110 and the ladder frame node plate 310 according to the drawing, and correspondingly locate the positioning tool 600 on the marks to limit the up-down/left-right positions when the rear tie rod 400 is connected with the ladder frame 300 and the rear girder 100 respectively, thereby being beneficial to improving the installation precision, avoiding errors and improving the reliability and stability of the overall installation system and the installation efficiency.

In some embodiments of the present invention, referring to fig. 5 (b) and 5 (c), the positioning fixture 600 includes a plurality of positioning fixtures 600 formed in a block shape and made of a magnetic material so as to adjust the installation positions of the plurality of positioning fixtures 600 according to the drawing sheet and thus adjust the installation positions of the rear tie rod 400.

That is, since the positioning jig 600 is formed in a block shape and is a magnetic material member, such as a magnetic positioning guide block, it can be easily attached to the rear girder node plate 110 and the ladder node plate 310. And the arrangement of the plurality of positioning fixtures 600 allows an operator to install them at different positions according to the requirements of the drawing sheet to adjust the installation position of the rear tie rod 400. Fine adjustment of the mounting position of the rear drawbar 400 can be achieved by moving, adding or deleting the positioning tool 600. To prevent the positioning fixture 600 from shifting, the worker would score out the corresponding positions of the corresponding ladder node plate 310 and rear girder node plate 110 before installation, so as to adjust in time when needed. In other embodiments, the magnetic material part inside the positioning tool 600 may be additionally provided with an electromagnetic element, and the magnetic force of the magnetic material of the positioning tool 600 may be adjusted when the power is on, so that the magnetic force may be adjusted as required, and the guiding function of the installation position of the rear pull rod 400 may be further realized. Therefore, the flexibility and the adjustability of the installation system are improved, and the installation accuracy and the installation adaptability are improved.

The embodiment of the invention also provides a mounting method for mounting a rear pull rod of a crane, which comprises the mounting system for mounting the rear pull rod of the crane according to the embodiment, and the mounting method can comprise the following steps:

step S1, correspondingly mounting an auxiliary platform 500 to the ladder frame 300 and the rear girder 100;

step S2, hoisting the ladder frame 300 provided with the auxiliary platform 500;

step S3, the rear tie rod 400 is mounted to the rear girder node plate 110 and the ladder node plate 310.

Specifically, the auxiliary platform 500 is installed to the ladder frame 300 and the rear girder 100 correspondingly, then the ladder frame 300 with the auxiliary platform 500 installed is hoisted, and finally the rear tie rod 400 is installed to the rear girder node plate 110 and the ladder frame node plate 310 according to the assistance of the operator on the auxiliary platform 500. Therefore, the mounting steps are simplified, the mounting difficulty is further reduced, and the mounting efficiency is improved.

In some embodiments of the present invention, referring to fig. 5 (a) to 5 (c), the installation system further includes a positioning fixture 600, and S1 includes:

step S11, installing a pair of first auxiliary platforms 510 to both ends of the ladder 300 surrounding the ladder node plate 310, respectively;

step S12, respectively installing a pair of second auxiliary platforms 520 to two sides of the rear girder 100, which are close to the rear girder node plate 110;

step S13, installing a plurality of positioning tools 600 on the rear girder node plate 110 and the ladder node plate 310 respectively.

Specifically, in step S11, the ladder platform, the pitch block, the front tie rod, the cantilever crane, and the like of the ladder frame are mounted using the car hoist 900 or the gantry, and the first auxiliary platform 510 is mounted, during which, as shown in fig. 3 (b), the product ladder platform interfering with the hoisting of the rear tie rod 400 is temporarily not mounted. In step S12, as shown in fig. 4, the second auxiliary platform 520 is installed using the crane 900 or the door machine. Step S13 and step S2 are sequentially performed, as shown in FIG. 5 (a), the overall verticality of the ladder frame 300, the verticality of the supporting tubes on two sides of the ladder frame 300 and the centering of the ladder frame 300 are firstly installed and measured, so that the requirements of the overall assembly quality of the ladder frame 300 and the requirements of the rear pull rod 400 before installation are met. Then, as shown in fig. 5 (b) and 5 (c), the positioning fixture 600 is installed on the girder node plate and the land side node plate of the ladder frame 300, the heavy plate of the ladder frame node plate 310 is temporarily not installed, and the rear tie rod 400 is welded in place after the installation is completed. That is, in addition to installing the first auxiliary platform 510 and the second auxiliary platform 520 for measuring the positions of the rear girder node plate 110 and the ladder node plate 310, respectively, it is necessary to install the positioning fixture 600 to ensure the guiding positioning of the rear tie rods 400 on the girder node plate and the land side node plate of the ladder 300, and to ensure the left and right positions of the tie rods and the positions of the stress holes 420. Through the synergistic effect of the auxiliary platform 500 and the positioning tool 600, the accuracy of the installation and positioning of the rear pull rod 400 is improved, the installation difficulty is reduced, the installation efficiency is improved, and the stability and the reliability of the whole installation system are jointly ensured.

In some embodiments of the present invention, step S3 includes:

step S31, installing the wind vibration resistant cable pulling lug plate 410 and determining the left and right installation positions of the rear pull rod 400 according to the wind vibration resistant cable pulling lug plate 410;

step S32, determining the upper and lower installation positions of the rear pull rod 400 according to the sizes of the two ends of the rear pull rod 400;

step S33, configuring a hoisting steel wire rope 700 with a short length and a long length;

step S34, the flow machinery 800 is used for matching with the hoisting steel wire rope 700 to slowly lift the rear pull rod 400 until the installation angle of the rear pull rod 400 is larger than the design angle;

step S35, lifting the rear pull rod 400 to an installation position and slowly descending a lifting hook, determining the installation position of the rear pull rod 400 according to the positioning tool 600 on the rear girder node plate 110, and inserting the rear girder node plate 110;

in step S36, the hook slowly descends, and the mounting position of the rear tie rod 400 is determined according to the positioning tool 600 on the ladder frame node plate 310 and inserted into the ladder frame node plate 310.

Specifically, as shown in fig. 6 (b), in step S31, the left and right positions of the rear tie rod 400 of the ladder 300 are determined according to the direction of the wind vibration resistant tab plate 410, and the rear tie rod 400 on the left side of the ocean surface is distinguished from the rear tie rod 400 on the right side of the ocean surface. Subsequently, as shown in fig. 6 (a), the end dimensions of the spiral pipe are measured, specifically, for example, the center lines of the rear stay 400 and the vertical rear girder 100 of the stay of the ladder 300 may be scribed using a laser theodolite, and the dimensions of the upper and lower ends of the top of the rear stay 400 from the center line of the vertical rear girder 100 of the stay may be measured and recorded as A, B, respectively. Similarly, a horizontal line of the upper surface of the rear girder 100 was drawn using a laser theodolite, and the dimension of the horizontal line of the upper surface of the rear girder 100 from the upper and lower ends of the bottom of the rear drawbar 400 was measured and recorded as C, D, respectively. According to the comparison of the differences between A and B and the differences between C and D, the up-down installation direction of the pull rod 400 behind the ladder 300 is determined, and reverse installation is avoided. Finally, as shown in fig. 7 (a), the installation wire rope 700 is arranged to be short and long, so that the installation angle of the rear pull rod 400 at the position a is larger than the design angle. Next, as shown in fig. 8 (a) to 8 (e), in order to ensure the stability of the lifting of the member with a large slenderness ratio, the lower end of the rear tie rod 400 is slowly lifted up while the lower end of the tie rod is slowly pushed forward and lifted up with the aid of the flow machine 800, so that the horizontal state of the member is gradually changed into an inclination angle required for installation, as shown in fig. 7 (b), i.e., the installation angle at b=the design angle. And (3) mounting and positioning sequence: the lower end of the rear tie rod 400 (rear girder node plate 110) is positioned first, and the upper end of the rear tie rod 400 (ladder node plate 310) is positioned later. Therefore, in the installation process, two hoisting points are designed for hoisting the rear pull rod 400 with the slenderness ratio more than 30, the rear pull rod 400 is not easy to bend after being hoisted, and meanwhile, the flow machinery 800 is adopted for assistance, so that the installation efficiency is ensured, the installation difficulty is reduced, and the installation accuracy is ensured.

In some embodiments of the present invention, step S3 further comprises: step S37, checking the mounting position of the rear pull rod 400 and the position of the stress hole 420, and welding after confirming that the error is absent; step S37 includes:

step S371, measuring distances between two opposite sides of the section of the rear girder node plate 110 where the rear pull rod 400 is located and two opposite ends of the rear girder node plate 110, which are respectively close to the two opposite sides, and respectively marking as e1 and e2;

step S372, the distances between the two opposite sides of the section where the ladder node plate 310 is located and the two opposite ends of the ladder node plate 310, which are respectively close to the two opposite sides, of the rear tie rod 400 are measured and respectively marked as f1 and f2;

step S373, controlling the distances e1, e2, f1 and f2 according to the drawing, and adjusting the left and right positions of the rear tie rod 400;

step S374, the difference between the diameter of the central axis of the bottom stress hole 420 of the pull rod 400 and the diameter of the stress hole 420 after the measured girder node plate 110 is inserted is denoted as g1, the difference between the diameter of the central axis of the top stress hole 420 of the pull rod 400 and the diameter of the stress hole 420 after the measured ladder node plate 310 is inserted is denoted as g2, and the distances g1 and g2 are controlled according to the drawing to adjust the layout of the positions in the stress hole 420;

in step S375, the rear tie rod 400 is welded to the rear girder node plate 110 and the rear tie rod 400 is welded to the ladder node plate 310 based on the left-right position adjustment and the position adjustment in the stress hole 420.

Specifically, as shown in fig. 9 (a) to 9 (e), before final installation and welding, the installation position of the rear pull rod 400 of the ladder frame should be checked, and the left and right positions of the pull rod and the positions of the stress holes 420 should be locally adjusted, so that welding is completed according to the drawing requirements after the installation quality requirements of the rear pull rod 400 of the ladder frame are met, according to the drawing requirements of the application, e1 should be equal to e2, f1 should be equal to f2, namely, both welding sides should be kept consistent as much as possible, safety risks caused by the influence of unbalanced stress on the stability of the rear pull rod 400 are avoided, and g1 and g2 should be equal to the radius of the corresponding node plate stress holes 420 respectively, so that stress can be well dispersed.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (10)

1. A mounting system for installing a rear pull rod of a crane, the crane comprising a rear girder, a land side upper beam connected above the rear girder and a ladder frame, wherein the connection of the rear girder and the land side upper beam is close to adjacent two sides of the ladder frame are provided with rear girder node plates, and the land side of the ladder frame is provided with ladder frame node plates, the mounting system is characterized in that the mounting system comprises an auxiliary platform, and the auxiliary platform comprises:

the first auxiliary platform is arranged on the land side of the trapezoid frame surrounding the trapezoid frame node plate and is used for assisting connection between the top of the rear pull rod and the trapezoid frame;

the second auxiliary platform is arranged on one side, close to the rear girder node plate, of the rear girder and is used for assisting connection between the bottom of the rear pull rod and the rear girder.

2. The mounting system of claim 1, wherein the first auxiliary platform is formed as a "concave" shaped frame structure covered with sheet material at the bottom and outside and surrounding reinforcing ribs, the "concave" shaped frame structure being disposed around the ladder node plates;

the inner side of the concave frame structure is provided with a guardrail so that an operator can measure the installation data of the upper end of the rear pull rod.

3. The mounting system of claim 2, wherein the second auxiliary platform is formed as a rectangular frame structure with an open top and a plate covered at a bottom so that an operator measures mounting data of a lower end of the rear stay.

4. A mounting system according to claim 3, wherein the first auxiliary platforms include a pair of the first auxiliary platforms provided at respective land side ends of the ladder surrounding the ladder node plate;

the rear girder comprises a pair, the second auxiliary platforms also comprise a pair, and the pair of the second auxiliary platforms are correspondingly arranged on two opposite sides of the pair of the rear girders, which are close to the rear girder node plates;

one or more wing plates which are formed into a hook shape are respectively arranged on one side of the land side of the ladder frame and one side of the land side upper cross beam, which is close to the rear girder node plate, one end of the first auxiliary platform, which is connected with the land side of the ladder frame, and one end of the second auxiliary platform, which is connected with one side of the land side upper cross beam, which is close to the rear girder node plate, are provided with one or more connecting pieces, one or more connecting pieces are provided with connecting holes, and the wing plates penetrate through the connecting holes to fix the first auxiliary platform and the second auxiliary platform;

and one side of the rear girder is also provided with a supporting rod for supporting the second auxiliary platform.

5. The mounting system of claim 1, further comprising a positioning fixture provided on the rear girder node plate and the ladder node plate to define an up/down/side-to-side position of the rear drawbar.

6. The mounting system of claim 5, wherein the positioning fixture includes a plurality of positioning fixtures formed in a block shape and made of a magnetic material so as to adjust mounting positions of the plurality of positioning fixtures according to a drawing sheet to thereby adjust mounting positions of the rear tie bars.

7. A mounting method for mounting a rear drawbar of a crane using a mounting system according to any of claims 1-6, characterized in that the mounting method comprises:

step S1, correspondingly mounting an auxiliary platform to a ladder frame and a rear girder;

s2, hoisting a ladder-shaped frame provided with the auxiliary platform;

and S3, installing the rear pull rod to the rear girder node plate and the trapezoid frame node plate.

8. The method of installing according to claim 7, wherein the installation system further comprises a positioning fixture, and the S1 comprises:

step S11, respectively installing a pair of first auxiliary platforms to two land-side ends of the ladder frame surrounding the ladder frame node plate;

step S12, respectively installing a pair of second auxiliary platforms to two sides of the rear girder, which are close to the rear girder node plate;

and S13, respectively installing a plurality of positioning tools on the rear girder node plate and the trapezoid frame node plate.

9. The method of installing according to claim 8, wherein said step S3 includes:

s31, installing a wind vibration resistant cable pulling lug plate and determining left and right installation positions of the rear pull rod according to the wind vibration resistant cable pulling lug plate;

s32, determining the upper and lower mounting positions of the rear pull rod according to the sizes of the two ends of the rear pull rod;

step S33, configuring a hoisting steel wire rope with a short length and a long length;

step S34, using a flowing machine to cooperate with the hoisting steel wire rope to slowly lift the rear pull rod until the installation angle of the rear pull rod is larger than the design angle;

step S35, lifting the rear pull rod to an installation position, slowly descending a lifting hook, determining the installation position of the rear pull rod according to a positioning tool on the rear girder node plate, and inserting the rear girder node plate;

and S36, slowly descending the lifting hook, determining the mounting position of the rear pull rod according to the positioning tool on the trapezoid frame node plate, and inserting the rear pull rod into the trapezoid frame node plate.

10. The mounting method according to claim 9, wherein the step S3 further includes: s37, checking the mounting position and the stress hole position of the rear pull rod, and welding after confirming that the mounting position and the stress hole position are correct; the step S37 includes:

step S371, measuring the distance between two opposite sides of the section where the rear tie rod is located and two opposite ends of the rear girder node plate, which are respectively close to the two opposite sides, of the rear girder node plate, and respectively marking as e1 and e2;

step S372, measuring the distance between two opposite sides of the section where the trapezoid frame node plate is located and two opposite ends, close to the two opposite sides, of the trapezoid frame node plate respectively, of the rear pull rod, wherein the distances are respectively marked as f1 and f2;

step S373, controlling the distances e1, e2, f1 and f2 according to the drawing, and adjusting the left and right positions of the rear pull rod;

step S374, measuring a diameter difference between a central axis of the rear girder node plate inserted into a bottom stress hole of the rear pull rod and the stress hole, and marking g1, measuring a diameter difference between a central axis of the trapezoid frame node plate inserted into a top stress hole of the rear pull rod and the stress hole, marking g2, and controlling the distances g1 and g2 according to a drawing so as to adjust the layout of the positions in the stress holes;

and step S375, respectively performing welding installation of the rear pull rod and the rear girder node plate and welding installation of the rear pull rod and the trapezoid frame node plate based on the left and right position adjustment and the position adjustment in the stress hole.