CN116803887A - Method for disposing excessive abrasion of tower cap of tower crane and connecting pin hole of rotary tower body on site - Google Patents
Method for disposing excessive abrasion of tower cap of tower crane and connecting pin hole of rotary tower body on site Download PDFInfo
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- CN116803887A CN116803887A CN202310766256.2A CN202310766256A CN116803887A CN 116803887 A CN116803887 A CN 116803887A CN 202310766256 A CN202310766256 A CN 202310766256A CN 116803887 A CN116803887 A CN 116803887A
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- cushion block
- tower
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- 238000005299 abrasion Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 40
- 241001136800 Anas acuta Species 0.000 claims abstract description 41
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000012938 design process Methods 0.000 claims description 2
- 238000011900 installation process Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 241000288140 Gruiformes Species 0.000 description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses a field treatment method for overlarge abrasion of a tower cap of a tower crane and a connecting pin hole of a rotary tower body. The method comprises the steps of measuring the abrasion quantity of a pin hole, manufacturing an adjusting cushion block, hanging a weight to find a balance point, installing a pin head adjusting cushion block, installing a middle and pin tail adjusting cushion block, recovering and fixing, and the like, so that the treatment is completed. By adopting the technology, firstly, the adjusting cushion block is reasonably designed according to the abrasion loss of the connection point of the tower cap and the rotary tower body of the tower crane; according to the teaching of the 'continuous function zero point theorem', the adjusting cushion block is safely and rapidly installed, the treatment is completed on site, hidden danger caused by overlarge abrasion of the pin hole of the tower crane is completely eliminated, the operation is restored stably, the ideal treatment effect is achieved, the traditional treatment mode can be avoided, the complicated operation, time and labor consumption, the construction period is influenced, and the defects that the strength and rigidity of an original structure are possibly weakened due to the fact that the important structural components are subjected to operations such as material removing processing and improper heat treatment are overcome, and zero damage to the original structure of the tower crane is achieved.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a field treatment method for excessive abrasion of a tower cap of a tower crane and a connecting pin hole of a rotary tower body.
Background
The tower crane tower cap and the rotary tower body are connected through pins, the alternating heavy load is frequently applied in work, the situation that the abrasion of the pin holes is increased is unavoidable in the middle and later stages of the service life of the tower crane, the vibration is increased when the tower crane is used for lifting cargoes, extra risks are increased for safe operation of the tower crane, and the abrasion of the pin holes is further accelerated due to the additionally increased vibration. Therefore, when the condition that the connecting pin hole is excessively worn is found, it is necessary to dispose of in time. In the face of the situation, no effective field treatment method is standardized before, or the tower crane is dismantled, the parts with excessive wear are transported back, and the parts are treated in the field in the modes of cutting, reaming, sleeving and the like, so that time and labor are wasted, the problem that the pin holes are subjected to material removal processing and heat treatment is avoided, and the risk of bringing additional potential safety hazards is avoided; or some reinforced iron sheets are randomly plugged at the oversized gap, or an iron plate is welded at the tail of the pin to limit the shaking amplitude, so that the treatment effect is poor, and the side effect is not small. Therefore, it is necessary to invent a normal and effective on-site disposal method with excessive abrasion of the tower cap of the tower crane and the connecting pin hole of the rotary tower body, so that hidden danger is eliminated in time, and the operation safety of the tower crane is ensured.
Disclosure of Invention
Aiming at the problems of lack of a safe, efficient, simple and easy treatment method when the abrasion of a tower cap and a rotary tower body connecting pin hole is overlarge in a tower crane, the invention reasonably designs a cushion block according to the connection structure of the tower cap and the rotary tower body of the tower crane and the stress variation characteristics in the operation process of the tower crane, adopts an ingenious installation method, uses small cost to treat in situ in time, achieves an ideal treatment effect, achieves the matching level of a pin shaft connection structure close to the matching level of a new factory tower crane after treatment, remarkably reduces shaking in the operation process of the tower crane compared with the operation process before treatment, remarkably improves stability, and reliably ensures the safety of the tower crane.
The invention discloses a field treatment method for overlarge abrasion of a tower cap of a tower crane and a connecting pin hole of a rotary tower body, which comprises the following steps: designing a matched adjusting cushion block according to the abrasion loss of the pin hole, and after finding out a hoisting balance point, installing the adjusting cushion block into the pin hole to restore and fix; the pin holes on the same side and the other side are treated in the same way according to the same operation, so that the field treatment is completed, and the hidden danger of excessive abrasion is eliminated; the method specifically comprises the following steps:
1) Pin hole wear and other relevant dimensional measurements: the pin shaft is pressed under the abrasion pin hole, gaps between the pin shaft and the abrasion pin hole are all above the pin shaft, the horizontal direction width a and the vertical direction length b of the tail side of the abrasion pin hole are measured, the diameter of the pin shaft is d, the distance between two lug plates of the tower cap is h, and the abrasion quantity of the pin hole is the maximum gap c=b-d;
2) Design and manufacture of the adjusting cushion block: according to the pin hole abrasion loss measured in the step 1), designing an adjusting cushion block with matched sizes for each abrasion pin hole, wherein the adjusting cushion block comprises a pin head adjusting cushion block, a middle adjusting cushion block and a pin tail adjusting cushion block, and the pin head adjusting cushion block is identical to the pin tail adjusting cushion block;
3) Hoisting and balancing points: referring to the related data of the tower crane using instruction, selecting a weight suitable for hoisting according to the material conditions of a construction site, slowly moving the hoisted object, finding a balance point, namely a zero point, of a pin shaft structure to be treated, and stabilizing the hoisted object at the position, wherein two pin shafts on the same side are in a balance state, namely the zero point;
4) Installing a pin head adjusting cushion block;
5) Installing the middle adjusting cushion block and the pin tail adjusting cushion block;
6) And (3) restoration fixation: checking that each adjusting cushion block is installed in place again, and ensuring that the pin shaft position is correct; the hanging weight is properly moved, so that the pin shaft firmly presses the pin tail adjusting cushion block on the upper surface of the tower cap pin hole; then welding and fixing the pin tail adjusting cushion block and the abrasion pin hole, installing the cotter pin, and coating antirust paint;
7) Adjustment and treatment of the other pin shaft structure on the same side: repeating the steps 4), 5) and 6) to finish the adjustment treatment of the other pin shaft structure at the same side;
8) And the other two pin shaft structures are adjusted and treated: repeating the step 3) -the step 7), and finishing the adjustment treatment of the two pin shaft structures at the other side;
9) And (3) completing treatment: and (3) operating the tower crane, checking the treatment effect of the pin shaft structure under various working conditions, and stably returning the suspended object to the original position to finish treatment.
Furthermore, the invention also defines that when the length b in the vertical direction is measured in the step 1), the lower part of the abrasion pin hole is directly positioned by the pin shaft, so that the measurement is convenient.
Furthermore, the invention also defines the design and manufacturing process of the adjusting cushion block in the step 2) as follows:
2.1 Pin head adjusting cushion blocks, middle adjusting cushion blocks and pin tail adjusting cushion blocks are of semi-elliptical structures, the radius R=d/2 of an inner circular arc, the short axis A=a of the ellipse, the long axis B=d+2c-X, the X is an adjusting coefficient, and the X=0.1-0.5;
2.2 The length T1 of the pin head adjusting cushion block and the pin tail adjusting cushion block is equal to the depth of the pin hole at the installation position; to limit the amount of play of the intermediate adjustment pad, its length t2=h-2;
2.3 According to the size, the adjusting cushion blocks are manufactured by Q235 steel, and 4 pin head adjusting cushion blocks, middle adjusting cushion blocks and pin tail adjusting cushion blocks are respectively arranged.
Furthermore, the invention also defines that the elliptical edge of one side of the middle adjusting cushion block, which is close to the pin head adjusting cushion block, is properly chamfered so as to facilitate the installation.
Furthermore, the invention also defines that in the step 3), the zero position is judged by observing whether the pin shaft is easy to knock or rotate.
Further, the invention also defines that the installation process of the pin head adjusting cushion block in the step 4) comprises the following steps:
4.1 Firstly, removing the cotter pin at one side of the pin shaft pin tail;
4.2 Lightly knocking out the pin shaft to a proper length, so that the pin head adjusting cushion block can be put in, the pin shaft is knocked out gently, and meanwhile, the pin shaft is protected by hands, so that the pin shaft is prevented from being withdrawn too much;
4.3 Cleaning the surface of the pin shaft and the inner surface of the pin head adjusting cushion block, placing the pin head adjusting cushion block on the upper surface of the pin shaft, and knocking the pin shaft and the pin head adjusting cushion block back to the original position;
furthermore, the invention also defines that in the step 5), when the middle adjusting cushion block is pushed to the inlet of the pin hole of the rotary tower body to be blocked, the gap between the pin shaft and the upper surface of the pin hole of the rotary tower body is enlarged by properly prying the tower cap, so that the middle adjusting cushion block is convenient to install, and the pushing is continued until the outer side surface of the pin tail adjusting cushion block is level with the outer surface of the worn pin hole, and the middle adjusting cushion block is installed in place.
Further, the invention also defines the step 6), after the pin shaft firmly presses the pin tail adjusting cushion block on the upper surface of the tower cap pin hole by moving the hanging position, the pin tail adjusting cushion block is welded and fixed with the abrasion pin hole.
By adopting the technology, compared with the prior art, the invention has the following beneficial effects:
1) By adopting the adjusting method, the matching of the tower cap of the tower crane and the connecting pin shaft of the rotary tower body with the pin hole is facilitated, the technical requirement level of the tower crane when the tower crane leaves the factory can be reached, the phenomenon of enlarged shaking of the tower crane caused by overlarge abrasion of the connecting pin hole of the tower cap of the tower crane and the connecting pin hole of the rotary tower body is eliminated, and the stability and the safety of the operation of the tower crane are restored;
2) The disposal method can be completed on site without dismantling the tower, is not limited by the height of the tower crane, whether the wall-attached device is installed or not and the surrounding environment where the tower crane is located, and can be implemented, thereby avoiding the operations of dismantling, reinstalling, transporting, hoisting and the like of the tower crane, and greatly reducing the safety risk in the disposal process.
3) In the implementation process of the disposal method, no material removing processing and heat treatment are carried out on the related metal structural parts of the tower crane, the potential risks possibly brought to the safety of the tower crane by the operations are avoided, the disposal process is simple, convenient and quick, the disposal of four pin shaft connection structures of one tower crane is completed, the disposal can be controlled to be completed within half a day, the construction period is greatly shortened, the disposal cost is greatly reduced, and the required cost is less than one tenth of that of the traditional disposal method.
4) According to the technology, firstly, according to the connection structure of the tower cap and the rotary tower body of the tower crane and the stress change characteristics in the operation process of the tower crane, the abrasion generation mechanism is analyzed, and according to field measurement data, an adjusting cushion block is reasonably designed and manufactured; then, according to the teaching of the 'continuous function zero point theorem', an installation method of the adjusting cushion block is found, an operation flow is formulated, the treatment is safely and quickly finished on site, hidden danger caused by overlarge abrasion of the pin hole of the tower crane is completely eliminated, the operation is stable, and an ideal treatment effect is achieved. And moreover, the defects that the traditional treatment mode is complicated in work, time-consuming and labor-consuming, the construction period is influenced, and the strength and rigidity of the original structure can be weakened due to the operations of material removal processing, improper heat treatment and the like of important structural members are overcome, so that the original structure of the tower crane is damaged zero.
Drawings
FIG. 1 is a schematic diagram of the positional relationship between a pin and a tower cap pin hole when measuring the wear of the pin hole, wherein the rotation structure part is hidden in order to reduce interference;
FIG. 2 is an enlarged partial cross-sectional view of A-A of FIG. 1;
FIG. 3 is a schematic perspective view of an adjusting pad;
FIG. 4 is a schematic front view of the adjustment block of FIG. 3;
FIG. 5 is a schematic side view of an intermediate adjustment block;
FIG. 6 is a schematic side view of a pin tail adjustment block;
FIG. 7 is a schematic view of the structure of the adjusting pad of the present invention after installation;
fig. 8 is a section A-A of fig. 7.
In the figure: 1. a tower cap; 2. a cotter pin; 3. rotating the tower body; 4. a pin shaft; 5. a pin head adjusting cushion block; 6. a middle adjusting cushion block; 7. pin tail adjusting cushion blocks; 8. wearing pin holes; 9. tower cap ear plate.
Detailed Description
The present invention will be further described with reference to the drawings and construction examples, but the scope of the present invention is not limited thereto:
the invention relates to a field treatment method for overlarge abrasion of a tower cap of a tower crane and a connecting pin hole of a rotary tower body, which comprises the steps of measuring the abrasion quantity of the pin hole and other relevant dimensions, designing and manufacturing an adjusting cushion block, hanging and finding a balance point (zero point), installing a pin head adjusting cushion block, installing a middle and pin tail adjusting cushion block, recovering and fixing, adjusting and treating another pin shaft structure on the same side, adjusting and treating two pin shaft structures on the other side and finishing treatment.
Application example: a certain engineering project is found in routine safety inspection, wherein the phenomenon of overlarge abrasion exists between a QTZ80 tower crane tower cap and a rotary tower body connecting pin hole, the method is used for disposing, the disposing process is safe and quick, the pin shaft connecting structure is well matched after disposing, the shaking of the tower crane is remarkably reduced, the operation is stable, the safety and the reliability are realized, and the specific disposing process is outlined as follows
1) Pin hole wear and other relevant dimensional measurements: as shown in fig. 1 and 2, the pin shaft 4 is pressed under the abrasion pin hole 8, so that the gap between the pin shaft 4 and the abrasion pin hole 8 is all above the pin shaft 4, and when the length of the pin tail side of the pin hole in the vertical direction is measured, the lower part is directly positioned by the pin shaft 4, thereby facilitating measurement; the method comprises the steps of measuring the vertical direction length b, the horizontal direction width a, the diameter d of a pin shaft and the distance h between tower cap ear plates 9 of a pin hole, calculating the maximum clearance c=b-d, wherein the abrasion pin hole 8 comprises a tower cap pin hole and a rotary pin hole, and the abrasion pin hole 8 comprises a tower cap pin hole and a rotary pin hole;
2) Confirmation of the design and manufacture of the structure of the cushion pin head adjusting cushion block 5, the middle adjusting cushion block 6 and the pin tail adjusting cushion block 7: all have semi-elliptic structures, the radius R of the inner arc is equal to d/2, the minor axis A of the ellipse is equal to a minor axis A of the ellipse, the major axis B is equal to d+2c-X, X is an adjustment coefficient, and X is equal to 0.1-0.5; the lengths T1 of the pin head adjusting cushion block 5 and the pin tail adjusting cushion block 7 are equal to the depths of pin holes at the installation positions; to limit the amount of play of the intermediate adjustment block 6, its length t2=h-2; according to a design drawing, 8 pin head adjusting cushion blocks 5 and 8 pin tail adjusting cushion blocks 7 are processed, and 4 middle adjusting cushion blocks 6 are processed, as shown in figures 3-6; the above specific data are shown in table 1.
TABLE 1 Pin hole wear measurement and related size calculation
3) Hoisting and leveling balance point (zero point): referring to the related data of the tower crane using instruction book, according to the material conditions of the construction site, selecting a weight suitable for hoisting (in the embodiment, a tower body standard section is adopted), slowly moving the hoisted object, finding out the zero point of a pin shaft structure to be treated by observing whether the pin shaft is easy to knock or rotate, and stabilizing the hoisted object at the zero point, wherein two pin shaft structures on the same side (a big arm side or a balance arm side) are in a balanced state (zero point);
4) The pin head adjusting cushion block 5 is installed:
4.1 The cotter pin 2 at the tail part of the pin shaft 4 is detached;
4.2 The pin shaft is gently knocked out to a proper length until the pin head adjusting cushion block 5 can be put in, the pin shaft 4 is knocked out, the action is gentle, and meanwhile the pin shaft 4 is protected by a hand, so that the pin shaft 4 is prevented from being withdrawn too much;
4.3 Cleaning the surface of the pin shaft on which the adjusting cushion block is to be installed and the inner surface of the pin head adjusting cushion block 5, and placing the pin head adjusting cushion block 5 at the correct position of the pin shaft 4;
4.4 The pin shaft 4 and the pin head adjusting cushion block 5 are knocked back to the original positions;
5) The middle adjusting cushion block 6 and the pin tail adjusting cushion block 7 are installed:
5.1 Cleaning the surface of the pin shaft 4 on which the adjusting cushion block is to be installed;
5.2 The side, with the chamfer, of the elliptical edge of the middle adjusting cushion block 6 is inwards placed on the surface of the pin shaft 4;
5.3 Lightly knocking the middle adjusting cushion block 4 into the pin hole at the tail side of the pin by using a tool;
5.4 The pin tail adjusting cushion block 7 is buckled on the pin shaft 4 next to the middle adjusting cushion block 6, and the middle adjusting cushion block 6 is continuously pushed to the middle through the pin tail adjusting cushion block 7;
5.5 If the middle adjusting cushion block 6 is blocked when being pushed to the pin hole entrance of the rotary tower body 3, a pry bar can be used to extend below the tower cap 1 at the position, so that the tower cap 1 is slightly pried up, the gap between the pin shaft 4 and the upper surface of the pin hole of the rotary tower body 3 is enlarged, and the middle adjusting cushion block 6 is convenient to enter;
5.6 Continuing to push the pin tail adjusting cushion block 7 and the middle adjusting cushion block 6 inwards by using a tool until the outer side surface of the pin tail adjusting cushion block 7 is level with the outer surface of the abrasion pin hole 8, which means that the two cushion blocks are installed in place, and taking proper measures on the pin head part to prevent the pin shaft 4 from being pushed out from the pin head side in the pushing process when the adjusting cushion blocks are pushed inwards;
6) And (3) restoration fixation:
6.1 Checking that all the adjusting cushion blocks are installed in place again, and ensuring that the position of the pin shaft 4 is correct;
6.2 The hanging weight is moved properly, so that the pin shaft 4 firmly presses the pin tail adjusting cushion block 7 on the surface of the abrasion pin hole 8;
6.3 Proper welding and fixing the pin tail adjusting cushion block 7 and the edge of the abrasion pin hole 8, as shown in fig. 7 and 8;
6.4 The cotter pin 2 at the tail part of the pin shaft 4 is mounted, and the mounting is completed by coating antirust paint;
7) Adjustment and treatment of the other pin shaft structure on the same side: repeating the steps 4), 5) and 6) for installing a pin head adjusting cushion block 5, a middle adjusting cushion block 6 and a pin tail adjusting cushion block 7, and finishing the adjustment treatment of the other pin shaft structure on the same side;
8) And the other two pin shaft structures are adjusted and treated: changing the hoisting amplitude, finding a balance point (zero point) of the pin shaft structure at the other side, namely repeating the steps 3) to 7), and installing a pin head adjusting cushion block 5, a middle adjusting cushion block 6 and a pin tail adjusting cushion block 7 to finish the treatment of the two pin shaft structures at the other side;
9) And (3) completing treatment: and (3) operating the tower crane, checking the treatment effect of the pin shaft structure under various working conditions, and stably returning the suspended object to the original position to finish treatment.
Claims (9)
1. The field disposal method for the excessive abrasion of the connecting pin holes of the tower caps and the rotary tower bodies of the tower crane is characterized in that matched adjusting cushion blocks are designed according to the abrasion loss of the pin holes, and after a lifting weight balance point is found, the adjusting cushion blocks are installed in the pin holes to restore and fix; the pin holes on the same side and the other side are treated in the same way so as to eliminate the hidden trouble of excessive abrasion.
2. The method for disposing the excessive abrasion on the site of the connecting pin holes of the tower cap and the rotary tower body of the tower crane according to claim 1 is characterized by comprising the following steps:
1) Pin hole wear and other relevant dimensional measurements: the method comprises the steps that a pin shaft (4) is pressed below a wear pin hole (8), gaps between the pin shaft (4) and the wear pin hole (8) are all above the pin shaft (4), the horizontal direction width a and the vertical direction length b of the tail side of the pin of the wear pin hole (8) are measured, the diameter of the pin shaft (4) is d, the distance between two lug plates (9) of a tower cap (1) is h, the maximum gap c=b-d is the pin hole wear, and the wear pin hole (8) comprises a tower cap pin hole and a rotary pin hole;
2) Design and manufacture of the adjusting cushion block: according to the pin hole abrasion loss measured in the step 1), designing an adjusting cushion block with matched sizes for each abrasion pin hole (8), wherein the adjusting cushion block comprises a pin head adjusting cushion block (5), a middle adjusting cushion block (6) and a pin tail adjusting cushion block (7), and the pin head adjusting cushion block (5) is identical to the pin tail adjusting cushion block (7);
3) Hoisting and balancing points: according to the relevant data of the tower crane using instruction, selecting a weight suitable for hoisting according to the material conditions of a construction site, slowly moving the hoisted object, finding a balance point, namely a zero point, of a pin shaft structure to be treated, and stabilizing the hoisted object at the position, wherein two pin shafts (4) on the same side are in a balance state, namely the zero point;
4) The pin head adjusting cushion block (5) is installed;
5) The middle adjusting cushion block (6) and the pin tail adjusting cushion block (7) are arranged;
6) And (3) restoration fixation: checking that each adjusting cushion block is installed in place again, and ensuring that the pin shaft position is correct; the crane weight is properly moved, so that the pin shaft (4) firmly presses the pin tail adjusting cushion block (7) on the upper surface of the tower cap pin hole; then, the pin tail adjusting cushion block (7) is welded and fixed with the abrasion pin hole (8), the cotter pin (2) is installed, and antirust paint is coated;
7) Adjustment and treatment of the other pin shaft structure on the same side: repeating the steps 4), 5) and 6) to finish the adjustment treatment of the other pin shaft structure at the same side;
8) And the other two pin shaft structures are adjusted and treated: repeating the step 3) -the step 7), and finishing the adjustment treatment of the two pin shaft structures at the other side;
9) And (3) completing treatment: and (3) operating the tower crane, checking the treatment effect of the pin shaft structure under various working conditions, and stably returning the suspended object to the original position to finish treatment.
3. The method for disposing the connecting pin holes of the tower crane cap and the rotary tower body on the site with excessive abrasion according to claim 2 is characterized in that when the length b in the vertical direction is measured in the step 1), the lower part of the abrasion pin hole (8) is directly positioned by a pin shaft (4), so that the measurement is convenient.
4. The method for on-site disposal of excessive wear of tower caps and connecting pin holes of a rotary tower body according to claim 2, wherein the design and manufacturing process of the adjusting cushion block in the step 2) is as follows:
2.1 The pin head adjusting cushion block (5), the middle adjusting cushion block (6) and the pin tail adjusting cushion block (7) are of semi-elliptical structures, the radius R of an inner circular arc is equal to d/2, the short axis A of the ellipse is equal to a, the long axis B is equal to d+2c-X, X is an adjusting coefficient, and X is equal to 0.1-0.5;
2.2 The length T1 of the pin head adjusting cushion block (5) and the pin tail adjusting cushion block (7) is equal to the depth of the pin hole at the installation position; in order to limit the play of the intermediate adjusting cushion block (6), the length T2 = h-2;
2.3 According to the size, the adjusting cushion blocks are manufactured by Q235 steel, and 4 pin head adjusting cushion blocks (5), middle adjusting cushion blocks (6) and pin tail adjusting cushion blocks (7) are respectively arranged.
5. A method for on-site disposal of excessive wear of the tower cap and the swivel tower connecting pin hole according to claim 2 or 4, characterized in that the oval edge of the side of the middle adjusting cushion block (6) close to the pin head adjusting cushion block (5) is properly chamfered for convenient installation.
6. The method for on-site disposal of excessive wear of tower caps and connecting pin holes of a rotary tower body according to claim 1, wherein in the step 3), the zero position is judged by observing whether the pin shaft is easy to knock or rotate.
7. The method for on-site disposal of excessive wear of tower caps and connecting pin holes of a rotary tower body according to claim 2, wherein the installation process of the pin head adjusting cushion block (5) in the step 4) comprises the following steps:
4.1 Firstly, removing the cotter pin (2) at one side of the pin tail of the pin shaft (4);
4.2 Gently knocking out the pin shaft (4) to a proper length, so that the pin head adjusting cushion block (5) can be put in, the pin shaft is knocked out gently, and meanwhile, the pin shaft (4) is protected by a hand, so that the pin shaft (4) is prevented from being withdrawn too much;
4.3 Cleaning the surface of the pin shaft (4) and the inner surface of the pin head adjusting cushion block (5), placing the pin head adjusting cushion block (5) on the upper surface of the pin shaft (4), and knocking the pin shaft (4) and the pin head adjusting cushion block (5) back to the original position.
8. The on-site treatment method for excessive abrasion of the tower cap of the tower crane and the connecting pin hole of the rotary tower body according to claim 2 is characterized in that in the step 5), when the middle adjusting cushion block (6) is pushed into the inlet of the pin hole of the rotary tower body (3) to be blocked, the gap between the pin shaft (4) and the upper surface of the pin hole of the rotary tower body (3) is enlarged by properly prying the tower cap (1), the middle adjusting cushion block (6) is convenient to install, and the pushing is continued until the outer side surface of the pin tail adjusting cushion block (7) is flush with the outer surface of the pin hole of the tower cap (1), and the method is installed in place.
9. The method for disposing the connecting pin holes of the tower caps and the rotary towers in the site with excessive abrasion according to claim 2 is characterized in that in the step 6), after the pin shaft (4) firmly presses the pin tail adjusting cushion block (7) on the upper surface of the pin holes of the tower caps by moving the hoisting position, the pin tail adjusting cushion block (7) is welded and fixed with the abrasion pin holes (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310766256.2A CN116803887B (en) | 2023-06-27 | 2023-06-27 | Method for disposing excessive abrasion of tower cap of tower crane and connecting pin hole of rotary tower body on site |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310766256.2A CN116803887B (en) | 2023-06-27 | 2023-06-27 | Method for disposing excessive abrasion of tower cap of tower crane and connecting pin hole of rotary tower body on site |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116803887A true CN116803887A (en) | 2023-09-26 |
| CN116803887B CN116803887B (en) | 2024-06-25 |
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| CN202107954U (en) * | 2010-12-31 | 2012-01-11 | 张振坤 | Switch rail connecting iron with diameter variable pin holes |
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| CN203222434U (en) * | 2013-04-18 | 2013-10-02 | 云南冶金昆明重工有限公司 | Articulation device of flat-top tower crane |
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| CN203222434U (en) * | 2013-04-18 | 2013-10-02 | 云南冶金昆明重工有限公司 | Articulation device of flat-top tower crane |
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| CN204778491U (en) * | 2014-12-31 | 2015-11-18 | 徐州建机工程机械有限公司 | Tower machine slewing tower and upper bracket connecting pin roll prevent changeing device |
| CN209510961U (en) * | 2018-12-24 | 2019-10-18 | 谢非 | A kind of anti-drop device of train brake plate buting iron round pin |
| CN215370510U (en) * | 2021-04-14 | 2021-12-31 | 江苏建友工程机械有限公司 | Front arm pin shaft support device of tower crane |
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| CN116803887B (en) | 2024-06-25 |
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