Jib tower crane chassis counterweight foundation and construction method

Abstract

The present invention relates to a counterweight type foundation for the boom type tower crane chassis and a construction method. The foundation is arranged above the basement and includes: a cross-shaped steel beam for installing the tower crane chassis; a tower crane support seat laid under the cross-shaped steel beam, and the tower crane support seat includes a reinforced concrete beam for placing the cross-shaped steel beam and a support column for supporting the reinforced concrete beam; the support column is a frame column supported at the intersection of the horizontal and vertical frame beams of the basement, and the frame column extends out of the ground elevation and is fixed to the bottom of the reinforced concrete beam; a plurality of concrete piers for fixing the reinforced concrete beam to the basement roof are fixedly arranged at intervals at the bottom of the reinforced concrete beam. The present invention uses the basement structure to fix and support the tower crane support seat, and at the same time replaces the traditional concrete pile cap with a reinforced concrete beam, saving raw materials and reducing construction waste without reducing the bearing capacity of the tower crane foundation; by adopting the method of placing the cross-shaped steel beam on the tower crane support seat, the disassembly and assembly of the tower crane are more convenient and fast, and it is applicable to the installation of various types of tower cranes.

Description

Technical Field

[0001] The invention belongs to the technical field of the construction of the boom tower crane foundation, and particularly relates to a counterweight type foundation for the chassis of a boom tower crane and a construction method thereof. Background Art

[0002] With the progress of society, the development of economy and the increase of urban building density, large steel structure buildings are increasing day by day. People's requirements for the environment are also getting higher and higher. The government has begun to formulate regulations to prohibit the tower crane boom from exceeding the safe range and reaching or occupying the neighbor's airspace. Restricted by this, many construction sites simply cannot use the trolley luffing tower crane. The boom tower crane has been widely used in high-rise buildings and large steel structure installations due to its relatively short slewing radius, large lifting height and large lifting capacity.

[0003] To ensure the safety of the tower crane during use, a tower crane foundation is usually set at the bottom of the tower crane. The traditional tower crane foundation is a simple cuboid concrete foundation, and the tower crane is fixed on the concrete foundation. However, the size of this tower crane foundation is large, and a large amount of concrete and steel bars are required for production. Not only is the cost high, but it also takes a long time for concrete curing, and the construction period is long. Moreover, in order to meet the bearing capacity requirements of the tower crane foundation, excavation and drilling and embedding steel lattice columns are often required. After the construction is completed, it is very troublesome to disassemble the tower crane foundation, which requires a lot of manpower and material resources, and generates a large amount of construction waste, causing pollution to the environment. Summary of the Invention

[0004] In order to solve the above problems, the invention develops a counterweight type foundation for the chassis of a boom tower crane, which is arranged above the basement. The basement structure is used to fix and support the tower crane support. At the same time, the traditional concrete pile cap is replaced with the form of a reinforced concrete beam, saving raw materials such as concrete and steel bars without reducing the bearing capacity of the tower crane foundation, reducing the generation of construction waste, and shortening the construction period. In addition, by placing the cross-shaped steel beam on the tower crane support, the disassembly and assembly of the tower crane are more convenient and fast, and it is applicable to the installation of various types of tower cranes.

[0005] The invention is realized by the following technical solutions: A counterweight type foundation for the chassis of a boom tower crane, which is arranged above the basement, includes:

[0006] A cross-shaped steel beam for installing the chassis of the tower crane;

[0007] The tower crane support pad is provided under the cross steel beam. The tower crane support includes a reinforced concrete beam for placing the cross steel beam and a support column for supporting the reinforced concrete beam. The support column is a frame column provided at the intersection of the horizontal and vertical frame beams of the basement, and the frame column extends out of the ground elevation and is fixed to the bottom of the reinforced concrete beam. At the bottom of the reinforced concrete beam, a plurality of concrete column piers for fixing the reinforced concrete beam to the basement roof are fixedly arranged at intervals.

[0008] A further improvement of the counterweight type foundation of the boom tower crane chassis of the present invention lies in that the reinforced concrete beam includes two relatively arranged reinforced concrete main beams and two reinforced concrete secondary beams fixed between the two reinforced concrete main beams. The two ends of the two reinforced concrete main beams are respectively fixed to the four support columns. The cross steel beam is placed in the middle of the two reinforced concrete secondary beams, and concrete column piers correspond to the four ends of the cross steel beam.

[0009] A further improvement of the counterweight type foundation of the boom tower crane chassis of the present invention lies in that the frame column extends out of the ground elevation by 0.1 - 1.0 m.

[0010] A further improvement of the counterweight type foundation of the boom tower crane chassis of the present invention lies in that pads are provided at the positions of the four pier cloths corresponding to the cross steel beam on the reinforced concrete beam.

[0011] A further improvement of the counterweight type foundation of the boom tower crane chassis of the present invention lies in that the reinforced concrete beam is assembled by precast beams, and steel bars for fixing to the support column and the concrete column pier are reserved at designated positions of the precast beams.

[0012] A further improvement of the counterweight type foundation of the boom tower crane chassis of the present invention lies in that the cross-sectional area at any position of the reinforced concrete beam is the same.

[0013] The present invention provides a construction method for the counterweight type foundation of the boom tower crane chassis as described above, including the following steps:

[0014] Before the construction of the basement, according to the tower crane foundation load algorithm, determine the size and shape of the reinforced concrete beam and the number and position of the concrete column piers, and verify the bearing capacity of the tower crane support under various working conditions;

[0015] Construct the concrete column piers. When constructing the basement, extend the top of the frame column serving as the support column out of the ground elevation. While binding the steel bars of the basement roof, bind the steel bars of the concrete column piers at the same time, so that the steel bars of the concrete column piers and the support column are both fixed to the steel bars of the basement roof. At the same time, pour the basement roof, the top of the support column and the concrete column piers, and reserve steel bars for fixing the reinforced concrete beam at the top of the support column and the top of the concrete column piers;

[0016] Construct the reinforced concrete beam according to the stated dimensions and shape, and fixedly connect the reinforced concrete beam to the corresponding support columns and concrete piers; pour concrete at the connection of the reinforced concrete beam with each support column and each concrete pier to complete the tower crane support seat.

[0017] After the tower crane support seat is completed, place the cross-shaped steel beam at the designated position on the reinforced concrete beam and level the cross-shaped steel beam.

[0018] A further improvement in the construction method of the counterweight type foundation of the luffing jib tower crane of the present invention lies in that after determining the quantity and position of the concrete piers, design the basement structure so that structural columns are provided at positions corresponding to each concrete pier in the basement, and the structural columns extend out of the ground elevation; when binding the steel bars of the basement top slab, fix the steel bars of the structural columns and the steel bars of the basement top slab; when pouring the basement top slab, pour the top of the structural columns together to form the concrete piers.

[0019] A further improvement in the construction method of the counterweight type foundation of the luffing jib tower crane of the present invention lies in that when constructing the reinforced concrete beam, first bind the steel bars of the reinforced concrete beam according to the stated dimensions and shape, and fixedly connect the steel bars of the reinforced concrete beam to the reserved steel bars of the support columns and concrete piers; when pouring concrete at the connection of the reinforced concrete beam with each support column and each concrete pier, pour the reinforced concrete beam at the same time.

[0020] A further improvement in the construction method of the counterweight type foundation of the luffing jib tower crane of the present invention lies in that the reinforced concrete beam is assembled by precast beams, and lap steel bars for fixedly connecting with the reserved steel bars of the support columns or the concrete piers are reserved at the designated positions of the precast beams; when constructing the reinforced concrete beam, hoist the precast beams to the site and fixedly connect the lap steel bars of each precast beam to the reserved steel bars of the support columns or the concrete piers according to the shape.

[0021] The counterweight type foundation of the luffing jib tower crane and the construction method of the present invention include but are not limited to the following beneficial effects:

[0022] 1. By using the basement structure to fix and support the tower crane support seat, and at the same time replacing the traditional concrete pile cap with the form of a reinforced concrete beam, raw materials such as concrete and steel bars are saved without reducing the bearing capacity of the tower crane foundation, the generation of construction waste is reduced, and there is no need for a long concrete curing time, thus shortening the construction period.

[0023] 2. By placing the cross-shaped steel beam on the tower crane support and then installing the tower crane chassis on the cross-shaped steel beam, it is possible to avoid setting construction joints at the connection between the tower crane foundation and the basement roof slab, ensuring the waterproof effect of the basement roof slab, making the disassembly and assembly of the tower crane more convenient and rapid, and enabling this tower crane foundation to be applicable to the installation of various models of tower cranes.

[0024] 3. The precast beam form is adopted to splice the reinforced concrete beam, making the splicing of the reinforced concrete beam more convenient and rapid, and eliminating the need to wait for the concrete curing of the reinforced concrete beam, further shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the elevation view of the counterweight type foundation of the luffing jib tower crane chassis in the embodiment of the present invention;

[0026] Figure 2 is the plan view of the counterweight type foundation of the luffing jib tower crane chassis in the embodiment of the present invention;

[0027] Figure 3 is the plan view of the cross-shaped steel beam when the boom is in two directions in the embodiment of the present invention;

[0028] Figure 4 is the cross-sectional view of the reinforced concrete beam in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The traditional tower crane foundation is a simple cuboid concrete foundation, and the tower crane is fixed on the concrete foundation. However, this type of tower crane foundation has large dimensions and requires a large amount of concrete and steel bars for production, which not only incurs high costs but also takes a long time for concrete curing, resulting in a long construction period. Moreover, in order to meet the bearing capacity requirements of the tower crane foundation, excavation and drilling for embedding steel lattice columns are often required. After the construction is completed, disassembling the tower crane foundation is very troublesome, consuming a large amount of manpower and material resources and generating a large amount of construction waste, causing environmental pollution. The present invention has developed a counterweight type foundation for the luffing jib tower crane chassis, which is installed on top of the basement, uses the basement structure to fix and support the tower crane support, and at the same time replaces the traditional concrete pile cap with a reinforced concrete beam form. Without reducing the bearing capacity of the tower crane foundation, it saves raw materials such as concrete and steel bars, reduces the generation of construction waste, and shortens the construction period. In addition, by adopting the method of placing the cross-shaped steel beam on the tower crane support, the disassembly and assembly of the tower crane are made more convenient and rapid, and it can be applicable to the installation of various models of tower cranes.

[0030] The following further describes the counterweight type foundation of the luffing jib tower crane chassis of the present invention with reference to the accompanying drawings.

[0031] Refer to Figure 1 and Figure 2 As shown, a counterweight type foundation for a luffing jib tower crane chassis includes:

[0032] Cross-shaped steel beam 10 for installing the tower crane chassis 50; a tower crane support seat disposed under the cross-shaped steel beam 10, the tower crane support seat including a reinforced concrete beam 30 for placing the cross-shaped steel beam 10 and a support column 40 for supporting the reinforced concrete beam 30; the support column 40 is a frame column disposed at the intersection of the horizontal and vertical frame beams of the basement, and the frame column extends out of the ground elevation and is fixed to the bottom of the reinforced concrete beam 30; a plurality of concrete column piers 20 for fixing the reinforced concrete beam 30 to the basement roof are fixedly spaced at the bottom of the reinforced concrete beam 30.

[0033] In this embodiment,

[0034] The reinforced concrete beam 30 includes two relatively arranged reinforced concrete main beams 31 and two reinforced concrete secondary beams 32 fixed between the two reinforced concrete main beams 31. The two ends of the two reinforced concrete main beams 31 are respectively fixed to the four support columns one by one. The cross-shaped steel beam 10 is placed in the middle of the two reinforced concrete secondary beams 32, and concrete column piers 20 are correspondingly provided at the four ends of the cross-shaped steel beam 10.

[0035] In order to save material costs without affecting the bearing capacity of the tower crane foundation, in this embodiment, it is preferred that the two ends of one of the reinforced concrete secondary beams 32 are respectively fixed to the two ends of the two reinforced concrete main beams 31, and the two ends of the other reinforced concrete secondary beam 32 are respectively fixed to the middle parts of the two reinforced concrete main beams 31. The two reinforced concrete secondary beams 32 are parallel to each other, and the spacing is adapted to the bottom dimension of the cross-shaped steel beam 10. The tower crane chassis 50 is fixedly installed on the two cross beams of the cross-shaped steel beam 10, and the intersection point of the cross-shaped steel beam 10 is the center point of the tower crane chassis 50, so that the tower crane foundation is stressed evenly. Using the tower crane foundation of this embodiment can meet the installation of different types of tower cranes.

[0036] Preferably, the frame column 40 extends out of the ground elevation A and forms an extension section 41 with a length of 0.1 - 1.0 m above the ground A.

[0037] In this embodiment, the length of the extension section 41 is +0.860 m.

[0038] Preferably, cushion plates are provided at the positions corresponding to the four ends of the cross-shaped steel beam 10 on the reinforced concrete beam 30. Through the setting of the cushion plates, not only the local pressure of the tower crane chassis 50 on the tower crane foundation is dispersed, but also the wear of the fulcrum of the cross-shaped steel beam 10 on the reinforced concrete beam 30 is prevented.

[0039] Preferably, the reinforced concrete beam 30 is assembled by precast beams, and steel bars for fixing to the support column 40 and the concrete column pier 20 are reserved at designated positions of the precast beams.

[0040] In this embodiment, the cross-sectional area at any position of the reinforced concrete beam 30 is the same, that is, the precast beam is a reinforced concrete beam with a standard cross-sectional size. The length of each precast beam is set according to the actual size and shape of the reinforced concrete beam 30, and adjacent precast beams are assembled and fixed by support columns 40 or concrete piers 20.

[0041] The present invention also provides a construction method for the counterweight type foundation of the boom tower crane. Refer to Figure 1 and Figure 2 As shown, the method includes the following steps:

[0042] S1. Before the basement construction, according to the tower crane foundation load algorithm, determine the size and shape of the reinforced concrete beam 30 and the quantity and position of the concrete piers 20, and verify the bearing capacity of the tower crane support under various working conditions;

[0043] S2. Construct the concrete piers 20. When the basement construction is carried out, extend the top of the frame column serving as the support column 40 out of the ground elevation A; while binding the steel bars of the basement top slab, bind the steel bars of the concrete piers at the same time, so that the steel bars of the concrete piers and the support columns are all bound and fixed to the steel bars of the basement top slab; at the same time, pour the basement top slab, the extended section 41 of the support column 40 and the concrete piers 20, and reserve steel bars at the top of the extended section 41 and the concrete piers 20 for fixing the reinforced concrete beam 30;

[0044] S3. Construct the reinforced concrete beam 30 according to the size and shape of the reinforced concrete beam 30, and make the reinforced concrete beam 30 correspond and be fixed to the support column 40 and the concrete piers 20; then pour concrete at the fixing positions of the reinforced concrete beam 30, each support column 40 and each concrete pier 20 to complete the tower crane support;

[0045] S4. After the tower crane support is completed, place the cross-shaped steel beam 10 at the designated position of the reinforced concrete beam 30 and level the cross-shaped steel beam 10.

[0046] Specifically, the present invention takes the JCD260 tower crane as an example to briefly explain the tower crane foundation load algorithm:

[0047] Description of the tower crane: When the height of the counterweight type tower body is 38.22 meters (9 standard sections), the maximum vertical force on the tower crane building is 124t; after subsequent attachment, its force is less than the load at the independent height, so the force after attachment is not considered; the counterweight Fg is 848KN, the self-weight Fv is 1169KN, the bending moment M is 5262KN·m, the horizontal force Fh is 170KN, and the width b of the chassis is 6m.

[0048] Cooperate with Figure 3As shown, A, B, C, and D are the four ends of the cross-shaped steel beam 10, RA, RB, RC, and RD are the load forces of the four ends of the cross-shaped steel beam as fulcrums, Q1 is the first direction of the boom, and Q2 is the second direction of the boom.

[0049] When the boom is in the first direction Q1, the calculation formulas for the loading forces RA, RB, RC, and RD at A, B, C, and D are as follows:

[0050]

[0051]

[0052] Formula (1) is the four-fulcrum algorithm, and formula (2) is the three-fulcrum algorithm. When the four-fulcrum algorithm gives a negative value, recalculate according to the three-fulcrum algorithm;

[0053] When the boom is in the second direction Q2, the calculation method for the loading forces RA, RB, RC, and RD at A, B, C, and D is as follows:

[0054]

[0055] Using the above algorithms to calculate the loading forces at A, B, C, and D when the boom is in the first direction Q1 and the second direction Q2 respectively, the specific results are as follows:

[0056] A B C D First direction Q1 388.4 kN 1240.3 kN 388.4 kN 0 Second direction Q2 65.8 kN 942.8 kN 942.8 kN 65.8 kN

[0057] After obtaining the above results, determine the size and shape of the reinforced concrete beam 30 and the number and position of the concrete column piers 20. Refer to Figures 2 to 4 As shown, the reinforced concrete beam 30 of this embodiment includes two relatively arranged reinforced concrete main beams 31 and two reinforced concrete secondary beams 32 fixed between the two reinforced concrete main beams 31. The two ends of the two reinforced concrete main beams 31 are fixedly connected to the four support columns 40 one by one. The cross-sectional areas of the reinforced concrete main beams 31 and the reinforced concrete secondary beams 32 are both 600*1000 mm, and the shape is similar to an open shape. There are 8 concrete column piers arranged oppositely at intervals on the two reinforced concrete secondary beams 32, and together with the four support columns 40, they form the a~m fulcrums as shown in Figure 2 As shown, in this embodiment, the A, B, C, and D ends of the cross-shaped steel beam 10 respectively correspond to the f, h, k, and m fulcrums;

[0058] Use the midas gen software to verify the bearing capacity of the tower crane support. Specifically, verify according to 8 working conditions. The 8 working conditions are respectively applying the four loading forces in the first direction Q1 to any one of f, h, k, and m, and applying the four loading forces in the second direction Q2 to any one of f, h, k, and m, simulating the internal force, deformation, and support reaction of the tower crane base, and then verifying whether the bearing capacity of the tower crane support meets the requirements.

[0059] In step S3, there are two methods for constructing the reinforced concrete beam 30:

[0060] One method is that the reinforced concrete beam 30 is cast in place. That is, first, the steel bars of the reinforced concrete beam are tied according to the size and shape of the reinforced concrete beam 30, and the steel bars of the reinforced concrete beam are tied and fixed to the steel bars reserved by the support columns 40 and the concrete column piers 20. After all the steel bars of the reinforced concrete beam are tied, while pouring concrete at the fixed positions of the reinforced concrete beam 30, each support column 40 and each concrete column pier 20, the reinforced concrete beam 30 is poured simultaneously to complete the overall pouring of the tower crane support.

[0061] The other method is that the reinforced concrete beam 30 is assembled by precast beams, and lap steel bars for fixing to the steel bars reserved by the support columns 40 or the concrete column piers are reserved at the designated positions (i.e., the fixed positions with the support columns 40 or the concrete column piers) of the precast beams. When constructing the reinforced concrete beam 30, the precast beams are hoisted to the site, and the lap steel bars of each precast beam are tied and fixed corresponding to the steel bars reserved by the support columns 40 or the concrete column piers according to the predetermined shape of the reinforced concrete beam. Then, concrete is directly poured at the fixed positions of the reinforced concrete beam, each support column and each concrete column pier to complete the overall pouring of the tower crane support.

[0062] When pouring the concrete of the basement top slab, it needs to be poured in layers, and the pouring height of each layer should not exceed 1000 mm. The pouring of the upper layer of concrete must be carried out before the initial setting of the lower layer of concrete. The concrete pouring is vibrated and compacted with a vibrating rod, and there should be no missed vibration or over-vibration. The concrete surface layer must be leveled. After the concrete pouring is formed, it must be cured within 12 hours, and the curing time is 14 days. Then, the area surrounded by the reinforced concrete beam 30 is backfilled with soil, and it must be backfilled in layers to meet the specification requirements to further improve the bearing capacity of the tower crane support.

[0063] Preferably, after determining the quantity and position of the concrete column piers 20, the basement structure is designed so that structural columns (which can be frame columns or steel pipe columns) are provided at the positions corresponding to each concrete column pier 20 in the basement, and the structural columns extend out of the ground elevation (the extension height is the same as the extension height of the support columns 40 to ensure that the reinforced concrete beam 30 remains horizontal). When tying the steel bars of the basement top slab, the steel bars of the structural columns and the steel bars of the basement top slab are fixed. When pouring the basement top slab, the top of the structural columns is poured simultaneously to form the concrete column piers 20. By setting the structural columns, the supporting capacity of the concrete column piers 20 can be improved.

[0064] By adopting the ballast-type foundation of the boom-type tower crane chassis of the present invention, it is only necessary to place the cross steel beam 10 on the tower crane support and then install the tower crane chassis 50 on the cross steel beam 10, saving raw materials such as concrete and steel bars. Compared with an independent tower crane foundation, a series of processes such as tower crane foundation excavation, cushion layer pouring, and steel bar binding are eliminated, and the disassembly and assembly of the tower crane is more convenient and faster, shortening the construction period and saving labor. At the same time, it is avoided to set a construction joint at the connection between the tower crane foundation and the basement roof, thereby ensuring the waterproof effect of the basement roof. The ballast-type foundation of the boom-type tower crane chassis of the present invention can be used cyclically and is suitable for different types of boom-type tower cranes. When replacing different boom-type tower cranes, it is only necessary to install the tower crane chassis at different radius positions of the cross steel beam, and calculate and place the counterweight according to the actual situation of the boom-type tower crane used.

[0065] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A construction method for a counterweight type foundation of a luffing tower crane boom, characterized in that, A counterweight type foundation for a luffing jib tower crane for construction above a basement, the counterweight type foundation for the luffing jib tower crane bottom frame comprising: A cross-shaped steel beam for installing the bottom frame of the tower crane; a tower crane support seat disposed under the cross-shaped steel beam, the tower crane support seat comprising a reinforced concrete beam for placing the cross-shaped steel beam and support columns for supporting the reinforced concrete beam; the support columns being frame columns provided at the intersection of the horizontal and vertical frame beams of the basement, and the frame columns extending out of the ground elevation and being fixed to the bottom of the reinforced concrete beam; a plurality of concrete column piers for fixing the reinforced concrete beam to the basement roof are fixedly spaced at the bottom of the reinforced concrete beam; The construction method comprises the following steps: Before the basement construction, according to the tower crane foundation load algorithm, determine the size and shape of the reinforced concrete beam and the number and position of the concrete column piers, and verify the bearing capacity of the tower crane support seat according to various working conditions; Construct the concrete column piers. When the basement is under construction, extend the top of the frame column serving as the support column out of the ground elevation; when binding the basement roof reinforcement, bind the concrete column pier reinforcement at the same time, so that both the concrete column pier reinforcement and the support column reinforcement are fixed to the basement roof reinforcement; pour the basement roof, the top of the support column and the concrete column pier at the same time, and reserve reinforcement for fixing the reinforced concrete beam at the top of the support column and the top of the concrete column pier; Construct the reinforced concrete beam according to the size and shape, so that the reinforced concrete beam is fixedly corresponding to the support column and the concrete column pier; pour concrete at the fixed positions of the reinforced concrete beam and each support column and each concrete column pier to complete the tower crane support seat; After the tower crane support seat is completed, place the cross-shaped steel beam at the designated position of the reinforced concrete beam and level the cross-shaped steel beam.

2. The construction method of the counterweight type foundation of the boom tower crane chassis according to claim 1, characterized in that, After determining the number and position of the concrete column piers, design the basement structure so that structural columns are provided at the positions corresponding to each concrete column pier in the basement, and the structural columns extend out of the ground elevation; when binding the basement roof reinforcement, fix the structural column reinforcement and the basement roof reinforcement; when pouring the basement roof, pour the top of the structural column at the same time to form the concrete column pier.

3. The construction method of the counterweight type foundation of the boom tower crane chassis according to claim 1, characterized in that, When constructing the reinforced concrete beam, first bind the reinforced concrete beam reinforcement according to the size and shape, and make the reinforced concrete beam reinforcement fixedly corresponding to the reinforcement reserved by the support column and the concrete column pier; when pouring concrete at the fixed positions of the reinforced concrete beam and each support column and each concrete column pier, pour the reinforced concrete beam at the same time.

4. The construction method of the counterweight type foundation of the boom tower crane chassis according to claim 1, characterized in that, The reinforced concrete beam is assembled by precast beams, and lapping reinforcement for fixing to the reinforcement reserved by the support column or the concrete column pier is reserved at the designated position of the precast beam; when constructing the reinforced concrete beam, hoist the precast beam to the site and fixedly correspond the lapping reinforcement of each precast beam to the reinforcement reserved by the support column or the concrete column pier according to the shape.

5. The construction method of the counterweight type foundation of the boom tower crane chassis according to claim 4, characterized in that, The cross-sectional area at any position of the reinforced concrete beam is the same.

6. The construction method of the counterweight type foundation of the boom tower crane chassis according to claim 1, characterized in that, The reinforced concrete beam includes two relatively arranged reinforced concrete main beams and two reinforced concrete secondary beams fixed between the two reinforced concrete main beams. The two ends of the two reinforced concrete main beams are respectively fixed to the four support columns, and the cross-shaped steel beam is placed in the middle of the two reinforced concrete secondary beams, and concrete column piers are correspondingly arranged at the four ends of the cross-shaped steel beam.

7. The construction method of the counterweight type foundation of the boom tower crane chassis according to claim 1, characterized in that, The frame column extends 0.1 to 1.0 m above the ground elevation.

8. The construction method of the counterweight type foundation for the boom tower crane chassis according to claim 1, characterized in that, Pads are provided at the positions of the reinforced concrete beam corresponding to the four ends of the cross-shaped steel beam.

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