Combined type foundation structure of high tower crane and construction method of combined type foundation structure

Abstract

The invention discloses a combined foundation structure of a high tower crane and a construction method thereof, and relates to the technical field of building construction. Comprising more than two cast-in-place piles arranged at the bottom of a foundation pit, a steel framework column arranged on the cast-in-place piles, a tower crane bearing platform arranged on the steel framework column, a foundation pit supporting horizontal supporting structure, foundation pit supporting piles arranged on the peripheral wall of the foundation pit and a foundation pit waterproof curtain. The foundation pit supporting horizontal supporting structure is connected between the tower crane bearing platform and the foundation pit supporting pile. The method has the advantages that the safety and stability of the foundation structure in the whole construction process of the tower crane are met, and vertical diagonal bracings and horizontal diagonal bracings on the periphery of the outer side of the combined high pile cap foundation stand column can be omitted.

Description

Technical Field

[0001] The invention relates to the technical field of construction, in particular to a combined foundation structure of a high tower crane and a construction method thereof. Background Art

[0002] In construction, the foundations of commonly used tower cranes usually include slab foundations, pile foundation cap concrete foundations, combined foundations, etc. Among them, the combined foundation used in construction (a high-platform foundation support structure composed of a concrete cap or steel platform, lattice steel columns or steel pipe columns, steel scissor braces, and cast-in-place piles or steel pipe piles, which is generally a pile that extends from the top of the basement roof to the bottom of the basement floor structure) has the characteristics of fast construction speed and strong adaptability. However, due to the large number of connection parts of the combined foundation, it is easy to improperly handle the connection parts or fail to set up the scissor braces in time during the construction process, which will affect its overall stability and safety, especially under strong wind conditions.

[0003] Each tower crane foundation has its own unique advantages and applicable conditions, but in terms of safety, the pile foundation cap concrete foundation (consisting of concrete cap and cast-in-place piles or precast piles) can effectively resist the uneven settlement and lateral displacement of the foundation soil layer, can effectively cope with various complex geological conditions and provide higher stability. Therefore, it is relatively mature and safe in the foundation selection of tower cranes and is widely used. Fig. 9 As shown in FIG. 10, in the construction of the combined high pile cap foundation for a tower crane in the basement of a building, the vertical support structure (lattice steel column + cast-in-place pile or steel pipe column + cast-in-place pile, etc., the lattice steel column or steel pipe column needs to pass through the basement floor of the project and be vertically connected to the pile foundation) of the combined high pile cap foundation for the tower crane (there is no horizontal constraint on the upper end, and there is lateral displacement during operation) is usually completed during the construction stage of the engineering foundation piles, and the construction of the upper concrete cap or steel platform of the combined foundation is completed before the large-scale excavation of the building basement, and then the tower crane on the upper part of the foundation is installed and put into use in advance. With the large-scale layered excavation of the building foundation pit to the basement floor, it is necessary to timely set the corresponding vertical steel scissors braces and horizontal scissors braces around the outer side of the steel columns and the reinforced and thickened concrete cushion layer at the bottom of the pit, so as to finally form a complete combined high pile cap foundation support structure to resist the torque, overturning force, vertical force and horizontal force and other loads transmitted by the tower crane.

[0004] It can be seen that during the process of excavating the foundation pit to the basement floor, the combined foundation structure of the tower crane (only the vertical support structure and the concrete cap or steel platform at the upper end of the combined foundation) is incomplete, and the overall stability of the combined foundation at this stage is poor. This is because the earthwork below the concrete cap or steel platform has not yet been excavated, and it cannot provide the necessary construction working surface for the vertical steel scissors brace, horizontal scissors brace and the reinforced and thickened concrete cushion layer at the bottom of the pit. As a result, the combined foundation's ability to resist horizontal forces and torsional forces during the foundation pit excavation construction stage is poor, affecting its overall stability and safety. At the same time, during the earthwork excavation stage, due to the incompleteness of the combined foundation structure, it does not meet the conditions for acceptance, and the overall construction procedure of the combined foundation cannot be carried out before acceptance. Summary of the invention

[0005] The purpose of the present invention is to provide a high tower crane combined foundation structure and a construction method thereof that can meet the safety and stability of the foundation structure during the entire tower crane construction process and can eliminate the vertical scissors braces and horizontal scissors braces around the outer sides of the combined high pile cap foundation columns.

[0006] The combined foundation structure of the high tower crane of the present invention is realized as follows: It includes two or more cast-in-place piles arranged at the bottom of the foundation pit, steel frame columns arranged on the cast-in-place piles, a tower crane cap arranged on the steel frame columns, a foundation pit support horizontal support structure, foundation pit support piles arranged on the surrounding wall of the foundation pit and a foundation pit water-stop curtain. The foundation pit support horizontal support structure is connected between the tower crane cap and the foundation pit support piles.

[0007] By combining the horizontal support structure of foundation pit support with the tower crane pedestal, the horizontal support structure of foundation pit support is adopted to resist the lateral displacement of the tower crane pedestal, so as to solve the problem that the upper end of the steel frame column is in a state without horizontal constraint for a long time, and the working condition of the tower crane pedestal is converted into the working condition of a safe pile foundation pedestal type concrete foundation, so as to achieve the conditions of eliminating the vertical scissors brace and horizontal scissors brace around the outer side of the combined high pile pedestal foundation column, and meet the requirements of the combined high pile pedestal foundation being inspected and accepted as a whole before the concrete pedestal of the combined high pile pedestal foundation of the tower crane is excavated. The construction procedures and equipment including the installation of the tower crane can be put into use quickly after the inspection and acceptance, and provide the necessary conditions for closing the opening on the basement level in advance.

[0008] Preferably, a first vertical steel plate waterstop is provided on the steel frame column corresponding to the basement floor to facilitate the later construction of the basement floor.

[0009] Preferably, a closed steel cylinder is provided on the steel frame column at the first vertical steel plate waterstop corresponding to the steel frame column, and its upper cover plate is located at the upper part of the basement floor, and the lower cover plate is located at the lower part of the basement floor cushion layer to protect the first vertical steel plate waterstop and the interior of the steel frame column from soil contamination. After the surrounding soil is excavated, the steel cylinder is removed according to the needs of the working surface, and the interior of the steel frame column and the first vertical steel plate waterstop are unfolded to connect them with the basement floor.

[0010] Preferably, a partial basement wall panel with a second vertical steel plate waterstop and reserved basement wall panel reinforcement is provided at the location corresponding to the basement wall panel on the horizontal supporting structure of the foundation pit support to facilitate the later construction of the basement wall panel.

[0011] Preferably, a transverse steel plate water stop and reserved basement panel reinforcement are provided on the side of the tower crane foundation to facilitate the later construction of the basement panel.

[0012] Preferably, the concrete pedestal surface is slightly higher than the basement panel structure to facilitate drainage of the equipment foundation, and the bottom is flush with the horizontal supporting structure of the foundation pit support.

[0013] The construction method of the combined foundation structure of a high tower crane of the present invention is achieved by: S1: During the construction phase of engineering piles and foundation pit support structure piles, according to the special construction plan for foundation pit support, foundation pit support structure piles and foundation pit water stop curtains are driven on the ground. At the same time, cast-in-place piles of the tower crane combined foundation are driven. After the concrete pouring of the cast-in-place piles is completed, the steel frame columns with the first vertical steel plate water stop and the closed steel cylinder are implanted into the cast-in-place piles to ensure that the first vertical steel plate water stop of the steel frame column is located at the basement panel position; S2: When the concrete strength of the bored pile reaches the condition for excavation, start excavating the first layer of soil. The first layer of soil is excavated to the bottom of the horizontal support structure of the foundation pit support. After the soil is leveled, the horizontal support structure of the foundation pit support and the tower crane cap with a horizontal steel plate water stop of the tower crane combined foundation are constructed; S3: When the concrete cap of the combined foundation of the tower crane reaches the strength required for installing the tower crane, the tower crane is installed and the acceptance procedure is completed. When the strength of the horizontal support structure of the entire foundation pit reaches the condition required for excavating the next layer of earthwork, the soil below the horizontal support structure of the foundation pit is continued to be excavated, and the tower crane is put into use at the same time. At this time, the top of the combined foundation of the tower crane is horizontally constrained by the horizontal support structure of the foundation pit, that is, the working condition of the combined high pile cap foundation is converted to the working condition of a safe pile foundation cap type concrete foundation until the tower crane is dismantled; S4: After the excavation reaches the basement floor and the basement floor cushion is completed, the outer wall of the steel cylinder is cut off according to the needs of the working surface, the upper and lower cover plates are retained, the steel frame columns and the first vertical steel plate water stop are unfolded, and the cross-sectional requirements of the basement floor structure connection are ensured, and then the construction of the basement floor and basement wall panels is started; S5: pouring the tower crane cap of the tower crane combined foundation and the basement panel together; S6: When the basement panel structure reaches the designed strength, all steel frame columns are removed to provide other professional construction conditions for the basement part under the tower crane; S7: After the tower crane is dismantled, remove the horizontal support structure of the foundation pit around the tower crane pedestal and the tower crane pedestal to ensure that all temporary structures under construction are separated from the permanent structure of the building.

[0014] Preferably, when constructing the horizontal support structure for foundation pit support in step S2, a partial basement wall panel with a second vertical steel plate waterstop and reserved basement wall panel steel bars is provided on the horizontal support structure for foundation pit support, and the basement wall panel construction is completed in step S4, so that the horizontal support structure for foundation pit support around the tower crane pedestal is cast and connected with the vertical structure of the building including the basement wall panel, and the connection part between the foundation pit support piles in the horizontal support structure for foundation pit support and the vertical structure of the building is removed.

[0015] Preferably, between steps S3 and S4, when the construction of the negative n-layer of the basement is carried out, the negative n-layer of the basement is directly cast together with the steel frame columns, n=1, 2, 3, ...

[0016] Compared with the prior art, the present invention has the advantages of ensuring the safety and stability of the foundation structure during the entire tower crane construction process and eliminating the need for vertical and horizontal scissor braces around the outer sides of the combined high pile cap foundation columns. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the combined foundation structure of a high tower crane of the present invention; Figure 2 for Figure 1 A partial enlarged view of point A; Figure 3 for Figure 1 A partial enlarged view of point B; Figure 4 for Figure 1 A local enlarged view of point C; Figure 5 for Figure 2 AA section view; Figure 6 Construction method of combined foundation structure for high tower crane Figure 1 ; Figure 7 Construction method of combined foundation structure for high tower crane Figure 2 ; Figure 8 for Figure 6 A partial enlarged view of point F; Fig. 9 A method for constructing a combined foundation structure of a high tower crane in the prior art Figure 1 ; Fig.10 A method for constructing a combined foundation structure of a high tower crane in the prior art Figure 2 .

[0018] Description of Figure Numbers: 1-foundation pit; 2-cast-in-place piles; 3-steel frame columns; 4-tower crane cap; 5-horizontal support structure for foundation pit support; 6-foundation pit support piles; 601-crown beam; 7-foundation pit water-stop curtain; 8-basement floor; 9-first vertical steel plate waterstop; 10-steel cylinder; 1001-lower cover plate; 11-basement floor cushion; 12-basement wall; 13-second vertical steel plate waterstop; 14-basement wall reinforcement; 15-partial basement wall; 16-horizontal steel plate waterstop; 17-reserved basement panel reinforcement; 18-basement panel; 19-engineering piles; 20-soil; 21-tower crane. DETAILED DESCRIPTION

[0019] Now, the combined foundation structure of a high tower crane and the construction method thereof of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments: like Figure 1 As shown in FIG. 8 , the combined foundation structure of a high tower crane of the present invention includes more than two cast-in-place piles 2 arranged at the bottom of a foundation pit 1, steel frame columns 3 (lattice steel columns are used) arranged on the cast-in-place piles, a tower crane pedestal 4 arranged on the steel frame columns 3, a foundation pit support horizontal support structure 5, foundation pit support piles 6 with crown beams 601 arranged on the peripheral wall of the foundation pit 1, and a foundation pit water-stopping curtain 7. The foundation pit support horizontal support structure 5 is connected between the tower crane pedestal 4 and the foundation pit support piles 6.

[0020] Preferably, a first vertical steel plate water stop 9 is provided on the steel frame column 3 corresponding to the basement floor 8 to facilitate the construction of the basement floor 8 at a later stage.

[0021] Preferably, a closed steel cylinder 10 is provided on the steel frame column 3 at the first vertical steel plate waterstop 9 corresponding to the steel frame column 3, and its upper cover plate is located on the upper part of the basement floor 8, and the lower cover plate 1001 is located on the lower part of the basement floor cushion layer 11, so as to protect the first vertical steel plate waterstop 9 and the interior of the steel frame column 3 from soil contamination. After the surrounding soil is excavated, the steel cylinder 10 is removed according to the needs of the working surface, and the interior of the steel frame column 3 and the first vertical steel plate waterstop 9 are unfolded to connect them with the basement floor 8.

[0022] Preferably, a partial basement wall panel 15 with a second vertical steel plate water stop 13 and reserved basement wall panel reinforcement 14 is provided at the position corresponding to the basement wall panel 12 on the horizontal support structure 5 of the foundation pit support, so as to facilitate the construction of the basement wall panel 12 at a later stage.

[0023] Preferably, a transverse steel plate water stop 16 and reserved basement panel reinforcement 17 are provided on the side of the tower crane support platform 3 to facilitate the construction of the basement panel at a later stage.

[0024] Preferably, the top of the concrete cap 3 is slightly higher than the basement panel 18 to facilitate drainage of the equipment foundation, and the bottom of the concrete cap 3 is flush with the foundation pit support horizontal support structure 5.

[0025] like Figure 6 As shown in FIG. 8, the construction method of the combined foundation structure of a high tower crane of the present invention is implemented as follows, comprising: S1: During the construction phase of the engineering piles 19 and the foundation pit support structure piles 6, the foundation pit support structure piles 6 and the foundation pit water stop curtain 7 are driven on the ground according to the special construction plan for foundation pit support, and at the same time, the cast-in-place piles 2 of the tower crane combined foundation are driven, and after the concrete pouring of the cast-in-place piles 2 is completed, the steel frame column 3 with the first vertical steel plate water stop 9 and the closed steel cylinder 10 is implanted into the cast-in-place pile 2, ensuring that the first vertical steel plate water stop 9 of the steel frame column 3 is located at the basement panel 18; S2: When the concrete strength of the bored pile 2 reaches the condition for excavation, start excavating the first layer of soil 20, excavate the first layer of soil 20 to the bottom of the foundation pit support horizontal support structure 5, level the soil, and construct the foundation pit support horizontal support structure 5 and the tower crane cap 4 with a horizontal steel plate water stop 16 of the tower crane combined foundation; S3: When the concrete cap of the tower crane combined foundation reaches the strength that can be installed with the tower crane 21, the tower crane 21 is installed and the acceptance procedure is completed. When the strength of all the foundation pit support horizontal support structures 5 reaches the conditions for excavating the next layer of earthwork, the soil 20 below the foundation pit support horizontal support structure 5 is continued to be excavated, and the tower crane 21 is put into use at the same time. At this time, the top of the tower crane combined foundation is horizontally constrained by the foundation pit support horizontal support structure 5, that is, the working condition of the combined high pile cap foundation is converted to the working condition of a safe pile foundation cap type concrete foundation until the tower crane 21 is dismantled; S4: After the excavation reaches the basement floor and the basement floor cushion layer 11 is completed, the outer wall of the steel cylinder 10 is cut off according to the needs of the working surface, the upper cover plate and the lower cover plate 1001 of the steel cylinder 10 are retained, and the steel frame column 3 and the first vertical steel plate water stop 9 are unfolded to ensure that the cross-sectional requirements of the basement floor 8 structural connection are met, and then the construction of the basement floor 8 and the basement wall plate 12 is started; S5: pouring the tower crane cap 4 and the basement panel 18 of the tower crane combined foundation together; S6: When the basement panel 18 structure reaches the design strength, all the steel frame columns 3 are removed to provide other professional construction conditions for the basement part under the tower crane 21; S7: After the tower crane 21 is dismantled, the foundation pit support horizontal support structure 5 and the tower crane cap 4 around the tower crane cap 4 are removed to ensure that all temporary structures under construction are separated from the permanent structure of the building.

[0026] Preferably, when constructing the horizontal support structure 5 for foundation pit support in step S2, a local basement wall panel 15 with a second vertical steel plate waterstop 13 and reserved basement wall panel steel bars 14 is provided on the horizontal support structure 5 for foundation pit support, and the construction of the basement wall panel 12 is completed in step S4, so that the horizontal support structure 5 for foundation pit support around the tower crane pedestal 4 is cast and connected with the vertical structure of the building including the basement wall panel 12, and the connection part between the foundation pit support piles 6 in the horizontal support structure 5 for foundation pit support and the vertical structure of the building is removed.

[0027] Preferably, during the construction of the negative n-layer of the basement between steps S3 and S4, the negative n-layer of the basement is directly cast together with the steel frame column 3, where n=1, 2, 3, ... (e.g. Figure 8 As shown, the basement negative 1 surface is directly cast together with the steel frame column 3).

Claims

1. A combined foundation structure for a high tower crane, characterized in that: It includes two or more cast-in-place piles arranged at the bottom of the foundation pit, steel frame columns arranged on the cast-in-place piles, a tower crane cap arranged on the steel frame columns, a foundation pit support horizontal support structure, foundation pit support piles arranged on the surrounding wall of the foundation pit and a foundation pit water-stop curtain. The foundation pit support horizontal support structure is connected between the tower crane cap and the foundation pit support piles.

2. The assembled foundation structure of a high tower crane according to claim 1, characterized in that: A first vertical steel plate waterstop is provided on the steel frame column corresponding to the basement floor to facilitate the later construction of the basement floor.

3. The assembled foundation structure of a high tower crane according to claim 2, characterized in that: A closed steel cylinder is arranged on the steel frame column at the first vertical steel plate water stop belt corresponding to the steel frame column, and its upper cover plate is located at the upper part of the basement floor plate, and the lower cover plate is located at the lower part of the basement floor plate cushion layer.

4. The assembled foundation structure of a high tower crane according to claim 1, 2 or 3, characterized in that: A partial basement wall panel with a second vertical steel plate water stop and reserved basement wall panel reinforcement is arranged at a position corresponding to the basement wall panel on the horizontal supporting structure of the foundation pit support.

5. The assembled foundation structure of a high tower crane according to claim 1, 2 or 3, characterized in that: Horizontal steel plate waterstop and reserved basement panel reinforcement are provided on the side of the tower crane pedestal.

6. The assembled foundation structure of a high tower crane according to claim 5, characterized in that: The concrete pedestal surface is higher than the basement panel structure, which is convenient for drainage of equipment foundation, and the bottom is flush with the horizontal supporting structure of the foundation pit support.

7. A construction method for a combined foundation structure of a high tower crane, characterized in that: The following steps are involved: S1: During the construction phase of engineering piles and foundation pit support structure piles, according to the special construction plan for foundation pit support, foundation pit support structure piles and foundation pit water stop curtains are driven on the ground. At the same time, cast-in-place piles of the tower crane combined foundation are driven. After the concrete pouring of the cast-in-place piles is completed, the steel frame columns with the first vertical steel plate water stop and the closed steel cylinder are implanted into the cast-in-place piles to ensure that the first vertical steel plate water stop of the steel frame column is located at the basement panel position; S2: When the concrete strength of the bored pile reaches the condition for excavation, start excavating the first layer of soil. The first layer of soil is excavated to the bottom of the horizontal support structure of the foundation pit support. After the soil is leveled, the horizontal support structure of the foundation pit support and the tower crane cap with a horizontal steel plate water stop of the tower crane combined foundation are constructed; S3: When the concrete cap of the combined foundation of the tower crane reaches the strength required for installing the tower crane, the tower crane is installed and the acceptance procedure is completed. When the strength of the horizontal support structure of the entire foundation pit reaches the condition required for excavating the next layer of earthwork, the soil below the horizontal support structure of the foundation pit is continued to be excavated, and the tower crane is put into use at the same time. At this time, the top of the combined foundation of the tower crane is horizontally constrained by the horizontal support structure of the foundation pit, that is, the working condition of the combined high pile cap foundation is converted to the working condition of a safe pile foundation cap type concrete foundation until the tower crane is dismantled; S4: After the excavation reaches the basement floor and the basement floor cushion is completed, the outer wall of the steel cylinder is cut off according to the needs of the working surface, the upper and lower cover plates are retained, the steel frame columns and the first vertical steel plate water stop are unfolded, and the cross-sectional requirements of the basement floor structure connection are ensured, and then the construction of the basement floor and basement wall panels is started; S5: pouring the tower crane cap of the tower crane combined foundation and the basement panel together; S6: When the basement panel structure reaches the designed strength, all steel frame columns are removed to provide other professional construction conditions for the basement part under the tower crane; S7: After the tower crane is dismantled, remove the horizontal support structure of the foundation pit around the tower crane pedestal and the tower crane pedestal to ensure that all temporary structures under construction are separated from the permanent structure of the building.

8. The construction method of the assembled foundation structure of a high tower crane according to claim 7, characterized in that: When constructing the horizontal support structure of foundation pit support in step S2, a partial basement wall panel with a second vertical steel plate waterstop and reserved basement wall panel steel bars is provided on the horizontal support structure of foundation pit support. In step S4, the construction of the basement wall panel is completed, so that the horizontal support structure of foundation pit support around the tower crane pedestal is cast and connected with the vertical structure of the building including the basement wall panel, and the connection part between the foundation pit support piles and the vertical structure of the building in the horizontal support structure of foundation pit support is removed.

9. The construction method of the assembled foundation structure of a high tower crane according to claim 7 or 8, characterized in that: Between steps S3 and S4, when the construction of the negative n layer of the basement is being carried out, the negative n layer of the basement is directly cast together with the steel frame columns, n=1, 2, 3,…

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