Tower crane foundation suitable for coastal area and construction method thereof

Abstract

The invention belongs to the technical field of building construction, and particularly relates to a tower crane foundation suitable for coastal areas and a construction method of the tower crane foundation. Comprising a cast-in-place pile, a latticed column fixed to the top of the cast-in-place pile and a supporting table welded to the top end of the latticed column, and the cast-in-place pile and the latticed column are both perpendicular to the horizontal plane; a water stop table is arranged at the upper end of the cast-in-place The cast-in-place piles and the water stop platform are both of reinforced concrete structures; the latticed column comprises at least four stand columns which are perpendicular to the horizontal plane and are arranged at intervals, and every two adjacent stand columns are connected through a connecting plate. The connecting plate is provided with a ventilation opening penetrating in the radial direction of the cast-in-place pile. The lower portion of the latticed column is fixedly connected with a waterstop plate, the lower end of the stand column is connected into the cast-in-place pile in a pouring mode, the upper portion of the latticed column protrudes out of the top face of the waterstop table, and the waterstop plate is connected into the waterstop table in a pouring mode. And underground water is prevented from permeating into the cast-in-place pile along the outer side wall of the cast-in-place pile and upwards permeating into the ground surface along a gap between the stand column and concrete, and the safety and the service life of a building on the ground surface are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and particularly relates to a tower crane foundation suitable for coastal areas and a construction method thereof. Background Art

[0002] Tower cranes and other large-scale lifting equipment are core equipment in the construction process. The quality of their foundation construction is directly related to the construction safety and progress of the entire project. At present, traditional tower crane foundation construction mostly adopts reinforced concrete monolithic casting foundation or precast reinforced concrete foundation. Among them, the earth excavation volume and concrete pouring volume of reinforced concrete monolithic casting are both large, and the time waiting for the concrete to reach the design strength is also long. The foundation construction cycle is long, and the waiting period before the tower crane is erected is long, which seriously affects the construction progress of the entire project. Although precast concrete foundations can shorten the construction period to a certain extent, due to their fixed structural form, they are difficult to adapt to complex geological conditions and diverse construction needs. In addition, when supporting large tower cranes, the structural stability is difficult to guarantee, posing a safety hazard.

[0003] To address the above-mentioned issues, some construction sites use a combination of reinforced concrete cast-in-place piles and steel columns as tower crane foundations. For example, Chinese patent publication number CN217601493U discloses a high-pile cap tower crane foundation, comprising a steel platform and support piles disposed below the steel platform; the support piles comprise reinforced concrete cast-in-place piles and steel columns fixed to the tops of the reinforced concrete cast-in-place piles and extending upward; the upper ends of the steel columns are fixedly connected to the steel platform. Although this structure reduces the amount of concrete used and shortens the concrete pouring and setting time, the adjacent steel columns are reinforced only by a single, integral tie plate, resulting in insufficient integrity and stability between the multiple steel columns, which is particularly noticeable in coastal areas with strong winds year-round. In addition, the steel columns in this invention are column structures with equal diameters at the top and bottom. The groundwater level in coastal areas and areas near rivers and lakes is relatively high. After the tower crane is dismantled, the steel columns need to be cut and removed. As the groundwater penetrates the bored piles, the water will not only penetrate upward along the side walls of the bored piles, but will also penetrate into the bored piles and penetrate upward along the steel columns in the bored piles, thereby causing foundation seepage after backfill construction, affecting the subsequent application of the site and shortening the service life of the building structure there. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a tower crane foundation and a construction method thereof suitable for coastal areas, improve the water-stopping performance of the tower crane foundation, avoid groundwater seepage, ensure the waterproof effect of subsequent buildings constructed above the tower crane foundation that has not been completely dismantled, and extend the service life of the buildings.

[0005] The technical solution adopted by the present invention to solve this technical problem is: a tower crane foundation suitable for coastal areas, comprising a cast-in-place pile, a lattice column fixed on the top of the cast-in-place pile, and a support platform welded to the top of the lattice column, wherein the cast-in-place pile and the lattice column are both perpendicular to the horizontal plane, and the top surface of the support platform is parallel to the horizontal plane; a water stop platform is provided adjacent to the upper end of the cast-in-place pile, and the water stop platform protrudes from the outer peripheral surface of the cast-in-place pile in the radial direction of the cast-in-place pile; the cast-in-place pile and the water stop platform are both reinforced concrete structures;

[0006] The lattice column includes at least four columns perpendicular to the horizontal plane, and the at least four columns are evenly spaced along the circumference of the cast-in-place pile; a connecting plate is provided between two adjacent columns and connected by the connecting plate; the connecting plate is provided with a ventilation hole that penetrates radially along the cast-in-place pile; a water stop plate is fixedly connected to the lower part of the lattice column, and the water stop plate is provided with a mounting hole that passes through from top to bottom, and the lattice column is passed through the mounting hole of the water stop plate and is sealed with the water stop plate;

[0007] The lower end of the column is cast and connected in the cast-in-place pile, the upper part of the lattice column protrudes from the top surface of the water stop platform, and the water stop plate is cast and connected in the water stop platform.

[0008] Furthermore, the cast-in-place piles are bored cast-in-place piles; the cast-in-place piles and the support platform are both cylindrical structures.

[0009] Furthermore, a plurality of connecting plates are provided between adjacent columns, and the connecting plates are evenly spaced along the axial direction of the columns.

[0010] Furthermore, the water stop plate is a ring plate structure.

[0011] Furthermore, the lower end of the lattice column is provided with a reinforcement ring plate welded to the column, the top surface of the reinforcement ring plate is coaxially provided with an annular groove, and the lower end of the column is inserted and fixed in the annular groove.

[0012] Furthermore, the lattice column is further provided with a reinforcement member, the reinforcement member comprising an upper screw rod and a lower screw rod parallel to the horizontal plane, the upper screw rod and the lower screw rod are spaced apart in the vertical direction and fixedly connected;

[0013] The upper screw is inserted into the ventilation hole of the connecting plate on one side of the lattice column, and the lower screw is inserted into the ventilation hole of the connecting plate on the other side of the lattice column; the outer sides of the upper screw and the lower screw are both sleeved with locking nuts and threadedly connected to the locking nuts, and the locking nuts are located on the outer side of the lattice column, and the locking nuts abut against the connecting plate along the radial direction of the lattice column.

[0014] Furthermore, the reinforcement member also includes a connecting rod, the upper screw rod is fixedly connected to the upper end of the connecting rod, and the lower screw rod is fixedly connected to the lower end of the connecting rod; the upper screw rod, the lower screw rod and the connecting rod are an integral structure formed in one piece.

[0015] Furthermore, the upper screw rod and the lower screw rod are both perpendicular to the connecting rod.

[0016] A construction method for a tower crane foundation in coastal areas comprises the following steps:

[0017] S1. Complete the pre-assembly of the lattice column by connecting at least four columns, connecting plates, water stop plates, support platforms, and reinforcements according to the design requirements, and then transport the lattice column to the tower crane foundation construction site;

[0018] S2, the bored pile hole is formed by the bored pile hole and the water stop hole, the sediment at the bottom of the hole is cleaned, and the steel cage of the bored pile is placed into the bored pile hole after ensuring that the bottom of the hole is clean;

[0019] S3. Insert the lower part of the lattice column delivered to the construction site into the cast-in-place pile hole to a certain depth and then temporarily fix it, ensuring that the column on the lattice column is perpendicular to the horizontal plane and the water stop plate is located in the water stop platform hole;

[0020] S4. Pour concrete into the bored pile hole until it reaches a certain length below the embedded column and wait for the concrete to reach the designed strength;

[0021] S5. Cut and process the steel cage of the waterstop according to the design drawings. First, tie the bottom steel mesh and use the horse stool bars to ensure the accurate position of the upper steel mesh to form a stable steel skeleton system of the waterstop.

[0022] S6. Pour concrete into the waterstop hole using a layered continuous pouring method. When pouring concrete, push it from one end of the waterstop hole to the other end in the horizontal direction. During the pouring process, avoid direct impact of concrete on the lattice column.

[0023] Step S2 should be completed before the lattice columns in step S1 are delivered to the site.

[0024] Furthermore, the step S1 includes the following steps:

[0025] A1. Connect all adjacent two columns among at least four columns with connecting plates to form a basic ring frame of lattice columns. Do not install the connecting plates that are pre-connected to the upper and lower screws on the reinforcement members.

[0026] A2. Place the reinforcement into the space enclosed by the four columns, with the upper and lower screws extending from both sides of the lattice column. Attach the connecting plates connected to the upper and lower screws to the columns, with the upper and lower screws extending through the connecting plates. Thread lock nuts onto the upper and lower screws, respectively, with the end faces of the lock nuts pressed against the connecting plates. This completes the installation of the reinforcement.

[0027] A3. Weld the support platform to the top of the column, and then put the water stop plate from bottom to top on the outside of the column 1 and the connecting plate and weld them. The water stop plate and the column 1 and the water stop plate and the connecting plate must be sealed.

[0028] Compared with the prior art, the present invention has the following beneficial effects: providing a tower crane foundation and construction method suitable for coastal areas, wherein the entire tower crane foundation is cast and fixed in a hard bearing soil layer with sufficient strength by setting cast-in-place piles, thereby ensuring the stability of the tower crane foundation, reducing the concrete pouring time and solidification time, and improving the construction efficiency of the entire tower crane foundation; utilizing the toughness of the lattice columns of the steel structure to improve the horizontal resistance of the tower crane foundation, allowing strong winds to pass through the spaces and ventilation holes between the columns, reducing the wind force borne by the lattice columns, and improving the stability of the tower crane; therefore, the present invention is particularly suitable for tower crane support and fixation at construction sites in areas with strong winds. In addition, the present invention also forms a water-stop step between the cast-in-place pile and the lattice column by setting a water-stop platform to prevent groundwater from penetrating upward along the outer wall of the cast-in-place pile to the ground surface; and by setting a water-stop plate on the lattice column, groundwater that has penetrated into the cast-in-place pile is prevented from penetrating upward along the gap between the column and the concrete to the ground surface, thereby ensuring the safety and service life of the buildings on the ground surface. By providing detachably connected reinforcement members on the lattice columns, not only can the strength of the lattice columns be further improved, but the assembly and manufacturing of the lattice columns can also be facilitated. The reinforcement members can be recycled and reused, saving costs and being environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0030] Figure 2 It is a schematic cross-sectional view of the structure along the plane where the center line of the present invention is located;

[0031] Figure 3 It is a schematic diagram of the axial structure of the structural column in one direction of the present invention;

[0032] Figure 4 It is a schematic diagram of the axial structure of the structural column in another direction of the present invention;

[0033] Figure 5 This is a schematic diagram of the main structure of the structural column in the present invention;

[0034] Figure 6 This is a schematic diagram of the axial cross-sectional structure of the structural column of the present invention;

[0035] Figure 7 It is a structural schematic diagram of the reinforcement member in the present invention;

[0036] Figure markings: 1- cast-in-place pile; 2- lattice column; 21- column; 22- connecting plate; 221- vent; 23- water stop plate; 3- support platform; 4- water stop platform; 5- reinforcing ring plate; 51- annular groove; 6- reinforcement member; 61- upper screw; 62- lower screw; 63- connecting rod; 64- locking nut. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings and examples.

[0038] As attached Figure 1-7 As shown, a tower crane foundation suitable for coastal areas comprises a bored pile 1, a lattice column 2 fixed on the top of the bored pile 1 and a support platform 3 welded to the top of the lattice column 2, the bored pile 1 and the lattice column 2 are both perpendicular to the horizontal plane, and the top surface of the support platform is parallel to the horizontal plane; a water stop platform 4 is provided adjacent to the upper end of the bored pile 1, and the water stop platform 4 protrudes from the outer peripheral surface of the bored pile 1 along the radial direction of the bored pile 1; the bored pile 1 and the water stop platform 4 are both reinforced concrete structures; the lattice column 2 comprises at least four columns 21 perpendicular to the horizontal plane, and at least four of the columns 21 are arranged along the radial direction of the bored pile 1 Arranged evenly spaced circumferentially; a connecting plate 22 is provided between two adjacent columns 21 and connected by the connecting plate 22; a vent 221 is provided on the connecting plate 22 which passes radially through the bored pile 1; a water stop plate 23 is fixedly connected to the lower part of the lattice column 2, and the water stop plate 23 is provided with a mounting hole which passes through from top to bottom, and the lattice column 2 is passed through the mounting hole of the water stop plate 23 and is sealed with the water stop plate 23; the lower end of the column 21 is cast and connected in the bored pile 1, the upper part of the lattice column 2 protrudes from the top surface of the water stop platform 4, and the water stop plate 23 is cast and connected in the water stop platform 4.

[0039] When the present invention is used, four groups are typically installed, evenly distributed around a horizontal plane and a common axis perpendicular to the horizontal plane. The cast-in-place piles 1 and waterstop platforms 4 are cast in pile holes at the construction site. The lattice columns 2 are also cast and fixed within the cast-in-place piles 1, extending upward to protrude above the top surface of the waterstop platforms 4. They are then connected to the support platform 3 by a tower crane or bolted together.

[0040] The bored piles 1 are used to cast and fix the entire tower crane foundation in a hard bearing soil layer of sufficient strength, making the present invention applicable to construction sites in coastal areas with soft soil. This not only ensures the stability of the tower crane foundation, but also reduces the concrete pouring and setting time, thereby improving the construction efficiency of the entire tower crane foundation. The lattice columns 2 are steel structures and are exposed above the ground. The toughness of the lattice columns of the steel structure is used to increase the horizontal resistance of the tower crane foundation, thereby preventing the bored piles 1 and the water stop 4 of the concrete structure from being damaged by horizontal forces. By arranging multiple columns 21 at intervals and providing ventilation holes 221 on the connecting plate 22, the airflow generated by strong winds can pass through the spaces between the columns 21 and the ventilation holes 221, thereby reducing the wind force borne by the entire lattice column 2 and improving the stability of the tower crane above it. Therefore, the present invention is particularly suitable for supporting and fixing tower cranes at construction sites in areas with strong winds. In addition, because the groundwater level in coastal areas, rivers, lakes, and other areas is relatively high, the present invention also forms a water-stop step between the water-stop platform 4 and the bored pile 1 to prevent groundwater from penetrating upward along the outer wall of the bored pile 1 to the surface; and prevents groundwater that has penetrated into the bored pile 1 from penetrating upward along the gap between the column 21 and the concrete to the surface by providing a water-stop plate 23 on the lattice column 2, thereby preventing groundwater from seeping up to the surface and affecting the safety of subsequent construction on site, thereby ensuring the safety and service life of the buildings on the surface. After the on-site tower crane is dismantled, the structural column 2 that protrudes upward from the top surface of the water-stop platform 4 is cut and recycled, and the top base surface of the water-stop platform 4 is repaired, and groundwater seepage is prevented by applying waterproof paint, laying waterproof membranes, and the like.

[0041] The bored pile 1 can be a bored pile or a sunken pipe pile. Preferably, the bored pile 1 is a bored pile. The bored pile has low construction cost, simple construction process and no vibration and noise pollution. The bored pile 1 includes a bored pile body of concrete structure and a steel cage cast in the bored pile body, and the steel cage is used to enhance the rigidity and strength of the entire bored pile 1. The projection of the bored pile 1 on the horizontal plane is located inside the projection of the support platform 3 on the horizontal plane, and the support platform 3 and the bored pile 1 are an integral structure cast and formed as a whole. The support platform 3 can be a cylindrical structure or a prismatic structure. In order to facilitate the casting and forming of the support platform 3 and the bored pile 1, the bored pile 1 and the support platform 3 are both cylindrical structures.

[0042] The columns 21 on the lattice columns 2 can be cut and processed from steel materials such as channel steel, angle steel, steel pipe, and I-beam. The lower ends of the columns 21 are cast and fixed in the cast-in-place piles 1. The connecting plate 22 is used to connect two spaced columns 21, enhancing the integrity and strength of the lattice columns 2. The connecting plate 2 can be a circular plate, a square plate, a regular hexagonal plate, etc., and is generally welded to the columns 21. The vents 221 on the connecting plate 2 can be holes of any shape, such as round or square holes. Generally, the vents 221 are configured as circular holes for ease of processing. A single connecting plate 22 can be provided between two adjacent columns 21, or multiple connecting plates 22 can be provided. Preferably, multiple connecting plates 22 are provided between two adjacent columns 21, and the multiple connecting plates 22 are evenly spaced along the axial direction of the columns 21. Wind can pass through the lattice columns 2 through the spaces between the connecting plates 22, further improving the stability of the entire tower crane foundation.

[0043] The waterstop plate 23 is used to prevent water from seeping up the columns 21. It can be a circular plate, square plate, regular hexagonal plate, or other structure. Preferably, the waterstop plate 23 is a ring plate structure. The circular hole inside the ring plate 23 can accommodate a vibrating rod. During the pouring of the waterstop platform 4, the vibrating rod can be inserted through the inner hole of the reinforcing ring plate into the formed hole to vibrate the concrete, facilitating the pouring of the waterstop platform 4.

[0044] The support platform 3 directly supports and connects to the tower crane base. It can be constructed of reinforced concrete or steel. For recycling purposes, it is preferred that the support platform 3 be constructed of steel, which is easily recyclable and saves costs. The tower crane base is bolted to the support platform 3. The support platform 3 is typically circular to prevent sharp corners that could affect operator safety.

[0045] Preferably, the lower end of the lattice column 2 is provided with a reinforcing ring plate 5 welded to the column 21, and the top surface of the reinforcing ring plate 5 is coaxially provided with an annular groove 51, and the lower end of the column 21 is inserted and fixed in the annular groove 51. The reinforcing ring plate 5 can expand the contact surface between the lattice column 2 and the bored pile 1, reduce the applied pressure, and improve the stability of the connection between the column 1 and the lattice column 1. In addition, the reinforcing ring plate 5 is also used for groundwater to seep up along the column 2. The inner hole of the reinforcing ring plate 5 can accommodate a vibrating rod. When pouring the bored pile 1, the vibrating rod can be inserted into the pile hole through the inner hole of the reinforcing ring plate to vibrate the concrete, thereby facilitating the pouring operation of the bored pile 1. The annular groove 51 is used to facilitate the operator to assemble and position the column 21 and the reinforcing ring plate 5, and to facilitate the welding operation of the two.

[0046] Preferably, the lattice column 2 is further provided with a reinforcement member 6, comprising an upper screw 61 and a lower screw 62 parallel to the horizontal plane. The upper screw 61 and the lower screw 62 are spaced apart in the vertical direction and fixedly connected. The upper screw 61 is inserted into the vent 221 of the connecting plate 22 on one side of the lattice column 2, and the lower screw 62 is inserted into the vent 221 of the connecting plate 22 on the other side of the lattice column 2. Locking nuts 64 are sleeved on the outer sides of the upper and lower screws 61 and 62 and threadedly connected to the locking nuts 64. The locking nuts 64 are located on the outer side of the lattice column 2 and abut against the connecting plate 22 along the radial direction of the lattice column 2. The outer diameter of the locking nuts 64 is required to be larger than the diameter of the vent 221. The two locking nuts located on both sides of the lattice column 2 cooperate with the connecting plate 22 on the lattice column 2 to position and connect the reinforcement member 6 to the inner side of the lattice column 2. The provision of a detachably connected reinforcement member 6 on the lattice column 2 not only further improves the strength of the lattice column 2 but also facilitates assembly and manufacture of the lattice column 2. The reinforcement member 6 can be removed from the lattice column 2 and recycled, saving costs and being environmentally friendly. The reinforcement member 6 is not spaced above the water stop 4.

[0047] The upper screw rod 61 and the lower screw rod 62 of the reinforcement member 6 can be connected by welding of a plate or a rod-shaped structure. Preferably, the reinforcement member 6 also includes a connecting rod 63, the upper screw rod 61 is fixedly connected to the upper end of the connecting rod 63, and the lower screw rod 62 is fixedly connected to the lower end of the connecting rod 63; the upper screw rod 61, the lower screw rod 62 and the connecting rod 63 are an integral structure formed in one piece. The reinforcement member 6 can be made by bending steel bars, which is not only convenient for processing and manufacturing, but also has higher strength than other connection methods, thereby improving the strength and integrity of the structural column. As a further preference, the upper screw rod 61 and the lower screw rod 62 are both perpendicular to the connecting rod 63, which reduces the volume of the reinforcement member 6 and facilitates installation.

[0048] Preferably, the number of columns 21 is an even number of four or more to facilitate the installation of the reinforcement 6. Considering that the reinforcement 6 needs to be installed in the central area surrounded by multiple columns, it is necessary to ensure that the space enclosed by the columns 21 is sufficiently large. To this end, preferably, four columns 21 are provided. The columns 2 are angle steel structures with the right-angled openings of the angle steel facing the inside of the lattice column. This increases the space between opposing columns 2, facilitating the installation of the reinforcement 6.

[0049] A construction method for tower crane foundation in coastal areas, comprising the following steps:

[0050] S1. Connect at least four columns 21, connecting plates 22, water stop plates 23, support platforms 3, and reinforcement members 6 according to design requirements to complete the pre-assembly of the lattice column 2, and then transport the lattice column 2 to the tower crane foundation construction site;

[0051] S2, cast-in-place pile hole forming operation to form cast-in-place pile hole and water stop platform hole, clean the sediment at the bottom of the hole, ensure that the bottom of the hole is clean and then put the steel cage of cast-in-place pile 1 into the cast-in-place pile hole;

[0052] S3, insert the lower part of the lattice column 2 transported to the construction site into the cast-in-place pile hole to a certain depth and then temporarily fix it, ensuring that the column 21 on the lattice column 2 is perpendicular to the horizontal plane and the water stop plate 23 is located in the water stop hole;

[0053] S4, pouring concrete into the bored pile hole, pouring concrete to a certain length below the embedded column 21, and waiting for the concrete to reach the designed strength;

[0054] S5. Cut and process the steel cage of the water stop platform 4 according to the design drawings. First, tie the bottom steel mesh and use the horse stool bars to ensure the accurate position of the upper steel mesh to form a stable steel skeleton system of the water stop platform 4.

[0055] S6. Pour concrete into the waterstop hole using a layered continuous pouring method. When pouring concrete, push it from one end of the waterstop hole to the other end in the horizontal direction. During the pouring process, avoid direct impact of the concrete on the lattice column 2.

[0056] Step S2 should be completed before the lattice column 2 manufactured in step S1 arrives at the site.

[0057] By assembling the water stop plate 23, support platform 3, reinforcement member 6 and other structures on the lattice column 2 machine in advance in the factory and then transporting them to the construction site and directly fixing them into the bored pile hole, the construction efficiency of the tower crane foundation is improved.

[0058] The connecting piece 22 and the column 21 can be fixedly connected by welding or bolting. Welding is preferred for installing and manufacturing the lattice column 2. The welding operation should comply with relevant welding process standards to ensure the quality of the weld. The parameters such as weld height and length should meet the design requirements. Specifically, step S1 includes the following steps:

[0059] A1. All adjacent two columns 21 among at least four columns 21 are fixedly connected by connecting plates 22 to form a basic annular frame of the lattice column 2. The connecting plates 22 pre-connected with the upper screws 61 and the lower screws 62 on the reinforcement member 6 are not installed yet.

[0060] A2. Place the reinforcement member 6 into the space enclosed by the four columns 21, with the upper screw rod 61 and the lower screw rod 62 extending from both sides of the lattice column 2. Attach the connecting plate 22 connected to the upper screw rod 61 and the lower screw rod 62 to the column 21, with the upper screw rod 61 and the lower screw rod 62 respectively passing through the connecting plate 22. Thread lock nuts 64 onto the upper screw rod 61 and the lower screw rod 62, respectively, and press the end faces of the lock nuts 64 against the connecting plate 22. This completes the installation of the reinforcement member 6.

[0061] A3. Weld the support platform 3 to the top of the column 21, and then put the water stop plate 23 from bottom to top on the outside of the column 1 and the connecting plate 22 and weld them. The water stop plate 23 and the column 1 and the connecting plate 22 must be sealed and welded.

[0062] The boring operation of bored pile holes is generally done by drilling to the hard soil layer to ensure the stability of the connection between the entire foundation and the soil layer. The depth of the lower part of the lattice column 2 inserted into the bored pile hole should generally be greater than one-third of the total length of the bored pile to ensure the stability of the connection between the lattice column 2 and the bored pile; the lower end of the lattice column 2 can be fixed to the steel cage of the bored pile 1 by steel bar binding, or the lattice column 2 can be positioned by setting up a bracket outside the pile hole. When pouring concrete into the bored pile hole, the insertion part of the lattice column 2 should be vibrated more to ensure that the concrete is dense and that the bored pile 1 and the lattice column 2 are fully fixed and connected. When pouring the water stop 4, the concrete around the water stop plate 23 should be vibrated densely to avoid quality defects such as honeycombs and rough surfaces, and to ensure a tight connection between the water stop plate 23 and the water stop platform 4.

[0063] After the on-site construction is completed and the tower crane is removed, it is preferred to use non-destructive cutting equipment such as hydraulic cutting saws to cut the part of the lattice column 2 protruding from the top surface of the water stop 4 along the control line. The lattice column 2 can also be cut by gas cutting, but fire prevention measures must be taken to control the cutting temperature and speed to avoid high temperature damage to the water stop and other structures. Monitor the stability of the structure in real time during the cutting process, and stop the operation immediately if any abnormality is found and take reinforcement measures. After the lattice column 2 is removed, grind the column 21 and its remaining part so that its surface is flush with the top surface of the water stop 4, clean up the iron filings, welding slag and other debris generated by the cutting, and repair the damaged area on the top surface of the water stop 4 to ensure that the base surface meets the requirements of waterproof construction. At the part where the column 21 is removed, re-lay the waterproof membrane or apply waterproof paint on the water stop 4 according to the design requirements, strengthen the node treatment, and ensure the waterproof effect.

[0064] In the description of the present invention, the terms "upper", "lower", "top", "bottom", "side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the figures. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationships in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0065] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tower crane foundation suitable for coastal areas, comprising a cast-in-place pile (1), a lattice column (2) fixed on the top of the cast-in-place pile (1), and a support platform (3) welded to the top of the lattice column (2), wherein the cast-in-place pile (1) and the lattice column (2) are both perpendicular to a horizontal plane, and the top surface of the support platform (3) is parallel to the horizontal plane; and characterized in that: A water stop platform (4) is provided adjacent to the upper end of the cast-in-place pile (1), and the water stop platform (4) protrudes from the outer peripheral surface of the cast-in-place pile (1) in the radial direction of the cast-in-place pile (1); the cast-in-place pile (1) and the water stop platform (4) are both reinforced concrete structures; The lattice column (2) comprises at least four columns (21) perpendicular to a horizontal plane, and the at least four columns (21) are evenly spaced along the circumference of the cast-in-place pile (1); a connecting plate (22) is provided between two adjacent columns (21) and the columns are connected via the connecting plate (22); the connecting plate (22) is provided with a vent (221) radially extending along the cast-in-place pile (1); a water stop plate (23) is fixedly connected to the lower portion of the lattice column (2), and the water stop plate (23) is provided with a mounting hole extending vertically, and the lattice column (2) is passed through the mounting hole of the water stop plate (23) and is sealed and connected to the water stop plate (23); The lower end of the column (21) is cast and connected in the cast-in-place pile (1), the upper part of the lattice column (2) protrudes from the top surface of the water stop platform (4), and the water stop plate (23) is cast and connected in the water stop platform (4).

2. The tower crane foundation suitable for coastal areas according to claim 1, characterized in that: The cast-in-place pile (1) is a bored cast-in-place pile; the cast-in-place pile (1) and the support platform (3) are both cylindrical structures.

3. The tower crane foundation according to claim 1, characterized in that: A plurality of connecting plates (22) are provided between adjacent columns (21), and the plurality of connecting plates (22) are evenly spaced along the axial direction of the columns (21).

4. The tower crane foundation suitable for coastal areas according to claim 1, characterized in that: The water stop plate (23) is a ring plate structure.

5. The tower crane foundation suitable for coastal areas according to claim 4, characterized in that: The lower end of the lattice column (2) is provided with a reinforcement ring plate (5) welded to the column (21); the top surface of the reinforcement ring plate (5) is coaxially provided with an annular groove (51); the lower end of the column (21) is inserted and fixed in the annular groove (51).

6. The tower crane foundation suitable for coastal areas according to any one of claims 1 to 5, characterized in that: The lattice column (2) is further provided with a reinforcement member (6), the reinforcement member (6) comprising an upper screw rod (61) and a lower screw rod (62) parallel to a horizontal plane, the upper screw rod (61) and the lower screw rod (62) being spaced apart in the vertical direction and fixedly connected; The upper screw rod (61) is inserted into the ventilation hole (221) of the connecting plate (22) on one side of the lattice column (2), and the lower screw rod (62) is inserted into the ventilation hole (221) of the connecting plate (22) on the other side of the lattice column (2); the outer sides of the upper screw rod (61) and the lower screw rod (62) are both sleeved with locking nuts (64) and threadedly connected to the locking nuts (64); the locking nuts (64) are located on the outer side of the lattice column (2), and the locking nuts (64) and the connecting plate (22) are in contact with each other along the radial direction of the lattice column (2).

7. The tower crane foundation suitable for coastal areas according to claim 6, characterized in that: The reinforcement member (6) further comprises a connecting rod (63), wherein the upper screw rod (61) is fixedly connected to the upper end of the connecting rod (63), and the lower screw rod (62) is fixedly connected to the lower end of the connecting rod (63); the upper screw rod (61), the lower screw rod (62) and the connecting rod (63) are an integrally formed structure.

8. The tower crane foundation suitable for coastal areas according to claim 7, characterized in that: The upper screw rod (61) and the lower screw rod (62) are both perpendicular to the connecting rod (63).

9. A construction method for a tower crane foundation in coastal areas according to claim 6, characterized in that: The following steps are included: S1. According to the design requirements, at least four columns (21), a connecting plate (22), a water stop plate (23), a support platform (3), and a reinforcement member (6) are connected to complete the pre-assembly manufacturing of the lattice column (2), and then the lattice column (2) is transported to the tower crane foundation construction site; S2, drilling rig to form the bored pile hole and the water stop hole, clean the sediment at the bottom of the hole, and after ensuring that the bottom of the hole is clean, put the steel cage of the bored pile (1) into the bored pile hole; S3, inserting the lower part of the lattice column (2) transported to the construction site into the bored pile hole to a certain depth and then temporarily fixing it, ensuring that the column (21) on the lattice column (2) is perpendicular to the horizontal plane and the water stop plate (23) is located in the water stop hole; S4, pouring concrete into the bored pile hole, pouring the concrete to a certain length below the embedded column (21), and waiting for the concrete to reach the designed strength; S5. Cut and process the steel cage of the water stop platform (4) according to the design drawings. First, tie the bottom steel mesh. Use the horse stool reinforcement to ensure the position of the upper steel mesh accurately, forming a stable steel skeleton system of the water stop platform (4); S6. Pour concrete into the waterstop hole using a layered continuous pouring method. When pouring concrete, push it from one end of the waterstop hole to the other end in the horizontal direction. During the pouring process, avoid direct impact of the concrete on the lattice column (2); Step S2 should be completed before the lattice column (2) prepared in step S1 is delivered to the site.

10. The construction method of tower crane foundation for coastal areas according to claim 9, characterized in that: The step S1 includes the following steps: A1. All two adjacent uprights (21) among at least four uprights (21) are fixedly connected by connecting plates (22) to form a basic annular frame of the lattice column (2), and the connecting plates (22) pre-connected with the upper screw rods (61) and the lower screw rods (62) on the reinforcement member (6) are not installed yet; A2. Place the reinforcement member (6) into the space enclosed by the four columns (21) so that the upper screw rod (61) and the lower screw rod (62) extend from both sides of the lattice column (2). Connect the connecting plate (22) connected to the upper screw rod (61) and the lower screw rod (62) to the column (21) and make the upper screw rod (61) and the lower screw rod (62) pass through the connecting plate (22) respectively. Thread the locking nuts (64) on the upper screw rod (61) and the lower screw rod (62) respectively and make the end faces of the locking nuts (64) press against the connecting plate (22) to complete the installation of the reinforcement member (6); A3. Weld the support platform (3) to the top of the column (21), and then sleeve the water stop plate (23) from the bottom to the outside of the column 1 and the connecting plate (22) and weld them. It is required that the water stop plate (23) is sealed and welded to the column 1, and the water stop plate (23) is sealed and welded to the connecting plate (22).

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