CN217500304U - Movable tower crane foundation - Google Patents
Movable tower crane foundation Download PDFInfo
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- CN217500304U CN217500304U CN202220356114.XU CN202220356114U CN217500304U CN 217500304 U CN217500304 U CN 217500304U CN 202220356114 U CN202220356114 U CN 202220356114U CN 217500304 U CN217500304 U CN 217500304U
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Abstract
The utility model provides a portable tower crane basis, relates to tower crane basis technical field for solve the unable used repeatedly of current tower crane basis and dismantle the more complicated technical problem of equipment process. Portable tower crane hoist basis includes: the foundation blocks are distributed up and down, and each foundation block is composed of a central piece and end pieces which are respectively connected through transition pieces along the horizontal direction and the vertical direction of the central piece; an anti-tilting and anti-twisting balance weight piece is arranged between the adjacent end pieces positioned on the same layer, and the area between the anti-tilting and anti-twisting balance weight piece and the foundation block is provided with earthing soil; the foundation block is provided with a connecting hole, and the connecting hole is used for connecting and fixing the foundation blocks which are arranged up and down through a fastening piece; every the basis piece is equipped with the tongue-and-groove, adjacent two on the basis piece peg graft between the tongue-and-groove and have two the fixed tenon is connected to the basis piece, just the tenon with be provided with fixing device between the basis piece.
Description
Technical Field
The utility model relates to a tower crane basis technical field especially relates to a portable tower crane basis.
Background
At present, a tower crane is one of important devices for hoisting and transporting operations in the building industry, and vertical transportation of most building materials is completed by the tower crane. In order to ensure the normal and safe operation of the tower crane, the tower crane must be fixedly installed on the tower crane foundation, and meanwhile, the tower crane foundation must be ensured to have enough overturn resistance.
Therefore, in the prior art, the foundation of the tower crane is mostly formed by pouring reinforced concrete into the ground in the building construction, but the construction period of the manufacturing method of the tower crane foundation is long, the construction progress of the project is influenced, the turnover utilization rate of the tower crane is reduced, and after the building construction is finished, the foundation cannot be reused and can only be discarded, so that the serious material waste and the environmental pollution are caused.
Therefore, the analysis shows that how to provide a mobile tower crane foundation which is convenient to disassemble, assemble and use and can be repeatedly used is a technical problem to be solved urgently by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a portable tower crane basis for solve the unable used repeatedly of current tower crane basis and dismantle the more complicated technical problem of equipment process.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a mobile tower crane foundation comprising: the foundation blocks are distributed up and down, and each foundation block is composed of a central piece and end pieces which are respectively connected through transition pieces along the horizontal direction and the vertical direction of the central piece; an anti-tilting and anti-twisting balance weight piece is arranged between the adjacent end pieces positioned on the same layer, and the area between the anti-tilting and anti-twisting balance weight piece and the foundation block is provided with earthing soil; the foundation block is provided with a connecting hole, and the connecting hole is used for connecting and fixing the foundation blocks which are arranged up and down through a fastening piece;
every the basis piece is equipped with the tongue-and-groove, adjacent two on the basis piece peg graft between the tongue-and-groove and have two the fixed tenon is connected to the basis piece, just the tenon with be provided with fixing device between the basis piece.
The fastener adopts a combination bolt, and the combination bolt is composed of a connecting bolt and a connecting nut.
Specifically, the center piece, the transition piece and the end piece are provided with the connecting holes, the connecting bolts penetrate through the connecting holes, the two ends of each connecting bolt are respectively provided with the connecting nuts, and the connecting nuts and the connecting bolts are suitable for connecting and fixing the foundation blocks which are arranged up and down.
During actual application, corresponding foundation bolt holes are pre-buried on foundation beams corresponding to tower cranes of different models, and foundation bolts are adopted to be connected with foundation sections of the tower cranes.
Preferably, the anchor bolt holes are square holes and/or circular holes.
Further, the central member has a cross-shaped structure.
Compared with the prior art, portable tower crane basis have following advantage:
the utility model provides an among the portable tower crane foundation, the tongue-and-groove that utilizes on a plurality of foundation blocks uses with the cooperation of tenon, connects the basis of constituteing the tower crane with the foundation block, easy dismounting can dismantle the foundation block after the construction is accomplished to reuse helps practicing thrift construction material, avoids environmental pollution simultaneously.
Drawings
Fig. 1 is the embodiment of the utility model provides a mobile tower crane foundation's side view structure schematic diagram.
Reference numerals:
1-a central piece; 2-a transition piece; 3-an end piece; 4-covering soil; 5-anti-tilt-torsion counterweight; 6-fastening piece.
Detailed Description
In order to facilitate understanding, the following description is made in detail in conjunction with the accompanying drawings of the specification for a mobile tower crane foundation provided by the embodiment of the present invention.
The embodiment of the utility model provides a portable tower crane basis, as shown in figure 1, include: the device comprises a plurality of foundation blocks which are distributed up and down, wherein each foundation block is composed of a central part 1 and end parts 3 which are respectively connected through transition parts 2 along the horizontal and vertical directions of the central part 1; moreover, an anti-tilting and anti-twisting balance weight piece 5 is arranged between the adjacent end pieces 3 positioned on the same layer, and a region between the anti-tilting and anti-twisting balance weight piece 5 and the base block is provided with a soil covering 4; the foundation blocks are provided with connecting holes, and the connecting holes are used for connecting and fixing the foundation blocks arranged up and down through fasteners 6;
in addition, each foundation block is provided with a mortise, a tenon for connecting and fixing the two foundation blocks is inserted between the mortises on the two adjacent foundation blocks, and a fixing device is arranged between the tenon and the foundation blocks.
Compared with the prior art, the embodiment of the utility model provides a portable tower crane basis have following advantage:
the embodiment of the utility model provides an among the portable tower crane foundation, the tongue-and-groove that utilizes on a plurality of foundation blocks uses with the cooperation of tenon, connects the basis of constituteing the tower crane with the foundation block, easy dismounting can dismantle the foundation block after the construction is accomplished to reuse helps practicing thrift construction material, avoids environmental pollution simultaneously.
Wherein, above-mentioned fastener 6 can adopt assembling bolt, and this assembling bolt comprises connecting bolt and coupling nut to the portable tower crane basis of this application of dismouting of being convenient for further.
Specifically, the central member 1, the transition member 2 and the end member 3 may be provided with connecting holes, connecting bolts may be disposed through the connecting holes, and connecting nuts may be disposed at both ends of the connecting bolts, respectively, so that the connecting nuts and the connecting bolts are adapted to connect and fix the upper and lower base blocks.
In actual application, corresponding foundation bolt holes are pre-embedded in foundation beams corresponding to different types of tower cranes and are connected with foundation sections of the tower cranes by foundation bolts; and the integral connection of the foundation adopts the tension of dispersed high-strength low-relaxation prestressed steel strands, so that the integral foundation is of a full-prestressed structure.
Preferably, above-mentioned rag bolt hole can adopt quad slit and/or circular port to be convenient for pre-buried and loading and unloading.
Further, the central member 1 may have a cross-shaped structure, and a steel strand may be inserted through the center thereof, and the central member 1, the transition member 2, and the end members 3 may be connected to each other by a shear member.
It needs to be supplemented and explained here, in the mobile tower crane foundation provided by the embodiment of the present invention, the concrete prefabricated component is closely connected with the tower crane through reasonable combination to form the tower crane foundation and the foundation which can be used for various types of tower cranes and works together with the tower crane; when the concrete member is prefabricated, a concave part and a convex part which are made of cast steel and arranged on the vertical connecting surface of the concrete member are matched with each other and have an installation gap, so that a metal member with a shear-resistant effect is formed; in the concrete member, the local pressure bearing and shearing resistance of a bolt hole which is specially used for fixing or replacing a foundation bolt meets the use requirement of a tower crane through design calculation; the special anchoring horizontal unbonded prestressed steel strands are metal members arranged at two ends of the concrete prefabricated part; the concrete prefabricated edge member is placed between the end pieces, suspended in the middle and configured to resist overturning and twisting.
To sum up, the embodiment of the utility model provides a portable tower crane foundation for the portable tower crane foundation of convenient dismouting in bottom residential district adopts extension foundation technology, makes the precast concrete assemble multi-purpose tower crane foundation adapt to the ground bearing capacity, and the precast concrete assembles multi-purpose tower crane foundation because of adopting special technology, and manufacturing accuracy is high, and bolt location is accurate; the bolt distance error is less than or equal to 2mm, the components are assembled without gaps, and the total error of the assembled whole base components is less than or equal to 2 mm; and moreover, due to the adoption of the optimized plane technology of the tower foundation, the anti-overturning capacity of the tower foundation is improved, and the use is safer and more reliable.
Furthermore, the embodiment of the utility model provides a portable tower crane basis's relevant design basis as follows:
QTZ40 calculates:
according to the 1 rule of JGJ/T197-2010 item 4.2.2, the bearing capacity of the foundation is calculated as follows:
in the formula:
substituting the formula:
A＝20.08㎡ I＝47㎡ W＝14.5㎡；
the calculation is carried out by using Zhonghuai Zhengxing 40B:
calculating by using the maximum bending moment of the working condition:
in the formula:
substituting the formula:
A＝28.4㎡、W＝24.8m 3 ；
and (3) calculating according to the non-working condition: selecting a non-working condition N (482 kN M) and 1385kNm Q (83 kN) of the just-xing QTZ80, and selecting Fg (900 kN);
the requirement can be satisfied by approximately taking Pkmax equal to 120kpa and less than 1.2fa equal to 144 kpa.
Analysis of anti-tip stability:
the length of the anti-inclination arm of QJZ40 is taken, the length of the concrete precast and assembled multipurpose tower crane foundation is 6.3M along the direction of the cross beam, and the arm of force is 3.15M; the most unfavorable moment arm of tipping is along the cross beam direction of 45 degrees, and considering that the width of the bottom plate is 2.1M, the length of the diagonal line of the straight and long type is 6.5+2.1 to 8.60M, considering that the side length of the chamfer converted square is 5.8M, and the most unfavorable moment arm of tipping resistance is 5.8/2 to 2.9M.
Calculating the anti-tipping moment:
1)QTZ40Fv＝280～430kN，
the QTZ40Fg takes 350 kN;
the minimum anti-tilt capacity is (280+350) × 2.9 ═ 1827 kn.m;
the maximum tipping moment of a general 400KN.M tower crane is 650-750, the safety coefficient is 2.3 and is more than 1.5, and the requirement of tipping resistance is completely met; (adding counter weight or covering soil over 130 kN) beam bending resistance: the lower part: 9 phi 160.9 × 9 × 201 × 300 × (1300-; the bending resistance of the prestressed beam; the lower part: 14, 0.85 × 0.9 × 14 × 120000 × (1150-140) ═ 1298.0kN · M is much larger than the traditional basis; (0.85 is the reduction coefficient of the assembly foundation) 6 shearing resistant pieces are adopted at the splicing surface, and the actually matched As is 6 multiplied by 690 is 4140mm 2 And the design requirements are met.
Beam bending resistance:
QTZ40/50 spliced parts are connected by adopting 2 upper parts and 7 lower parts of high-strength low-relaxation prestressed steel strands in double rows.
Beam bending resistance: upper part: 2 phi 15.20.9X 9X 201X 300X (1300-170-70) 517.8kN Dingwang foundation; the bending resistance of the prestressed beam; the lower part: 7, 0.85 × 0.9 × 14 × 120000 × (1150-140) ═ 1298.0kN · M is much larger than the traditional basis; (0.85 is the reduction coefficient of the assembly foundation) 6 shearing resistant pieces are adopted at the splicing surface, and the actually matched As is 6 multiplied by 690 is 4140mm 2 Satisfy the designAnd (4) requiring.
The stress of the steel strand and the foundation in the use process of the tower footing is as follows:
by ANASYS finite element analysis, after the steel strand is stretched, the change range of stress is very small in the using process of a crane, the change range is within 10% of the initial stress value, the foundation bearing basically meets the requirement in a normal using state, and a zero-pressure area cannot appear; the elastic modulus of the foundation has certain influence on the distribution of the compressive stress; after the concrete members of the foundation are tensioned, the whole foundation is a full prestressed structure, and no tensile stress occurs between foundation parts; the friction force between concrete members is large, the shearing force born by the shearing connecting piece is small, and only the splicing and positioning effects are achieved.
Independent height and attachment height of the foundation:
for a QTZ40 tower crane, the maximum independent heights from the top of a foundation to a lifting hook are respectively 32m, when the independent heights are out, an attaching wall is additionally arranged at the position from the top of the foundation to 24m, the distance between the attaching wall and the wall is 18-24 m, the height from a surface layer partition wall to the lifting hook is less than 20m, the total height of the attached tower crane can respectively reach 100m, for the tower crane additionally provided with the attaching wall, due to the constraint of two attaching walls, the tower crane foundation almost only bears the axial pressure on a tower body, and the maximum stress at the bottom of the prefabricated assembly foundation is NA less than 80kPa, so that the requirement is met.
Because the high-strength and low-relaxation prestressed steel strands are adopted, from the stress angle, the tensile strength of a 1860-level single wire is 260kN, the yield strength is not less than 220kN, the adopted tensile force is 120kN and is only half of the tensile strength, the wire is completely in an elastic working state, plastic deformation cannot be generated between two anchored ends, and fatigue can not be considered; as the tension force is not large, the clamping area of the anchoring end is not obviously damaged under normal conditions, only a few nicks exist, the steel strand can be continuously used without broken ribs and obvious rust removal, if 3 steel wires in the clamping area reduce the area of 1/3, the steel strand should be scrapped, the same clamping area is not suitable for more than 12 times, and for multiple anchoring, steel plate pads can be added, and the clamping area is moved (according to the specification: GB 50010-20023.1.3, the fatigue calculation can not be carried out).
And (3) tension force calculation: p ═ axp;
a is the area of the cylinder diameter of the tensioning machine (4771 mm) 2 ) (ii) a p is the oil pressure meter reading, the reading below 400KN & M is 24-26 generally, and the reading below 400KN & M is 28-30;
p ═ axp, when a ═ 3550mm 2; p is the oil pressure gauge reading; generally, the reading is 33 to 35 under 400Kn.M, and the reading is 35 to 38 under 400 kN.M.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A mobile tower crane foundation, comprising: the foundation blocks are distributed up and down, and each foundation block is composed of a central piece and end pieces which are respectively connected through transition pieces along the horizontal direction and the vertical direction of the central piece; an anti-tilting and anti-twisting counterweight is arranged between the adjacent end pieces on the same layer, and a region between the anti-tilting and anti-twisting counterweight and the foundation block is provided with earthing soil; the foundation blocks are provided with connecting holes, and the connecting holes are used for connecting and fixing the foundation blocks which are arranged up and down through fasteners;
every the basis piece is equipped with the tongue-and-groove, adjacent two on the basis piece peg graft between the tongue-and-groove and have two the fixed tenon is connected to the basis piece, just the tenon with be provided with fixing device between the basis piece.
2. The mobile tower crane foundation of claim 1, wherein the fastener is a combination bolt, and the combination bolt is composed of a connecting bolt and a connecting nut.
3. The mobile tower crane foundation of claim 2, wherein the center piece, the transition piece and the end piece are provided with the connecting holes, the connecting bolts are arranged through the connecting holes, the connecting nuts are respectively arranged at two ends of the connecting bolts, and the connecting nuts are adapted to the connecting bolts so as to connect and fix the foundation blocks arranged up and down.
4. The mobile tower crane foundation of any one of claims 1-3, wherein corresponding foundation bolt holes are pre-embedded in the foundation beam corresponding to different types of tower cranes and are connected with the tower crane foundation sections by foundation bolts.
5. The mobile tower crane foundation of claim 4, wherein the anchor bolt holes are square holes and/or circular holes.
6. The mobile tower crane foundation of claim 1 wherein said center piece is a cross-shaped structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220356114.XU CN217500304U (en) | 2022-02-22 | 2022-02-22 | Movable tower crane foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220356114.XU CN217500304U (en) | 2022-02-22 | 2022-02-22 | Movable tower crane foundation |
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| Publication Number | Publication Date |
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| CN217500304U true CN217500304U (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220356114.XU Active CN217500304U (en) | 2022-02-22 | 2022-02-22 | Movable tower crane foundation |
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- 2022-02-22 CN CN202220356114.XU patent/CN217500304U/en active Active
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