Construction Method of Composite Steel Structure Tower Crane Foundation with Core Pipe Piles for Deep Foundation Pit Support

Abstract

The present invention relates to a construction method for a combined steel structure tower crane foundation with a reinforced core pipe pile support in a deep foundation pit, which includes nine construction steps: pipe pile construction, stiffening core construction, processing of combined steel structure tower crane foundation components, installation of pipe pile conversion heads and corner column connectors at the corners of the platform, primary installation of I-shaped side beams, installation of platform beam combined structures, secondary installation of I-shaped side beams, pipe pile stiffening connection, and tower crane installation and construction; the tower crane foundation platform is divided into multiple parts such as corner column connectors, side beams, and platform combined structures, which can improve the handling efficiency and reduce the installation difficulty; the installation of the tower crane foundation platform is realized by installing a corner column connector on the upper part of the pipe pile conversion head, and the stiffening connection of the pile body is realized by installing a stiffening connector on the lower part. Each component can be connected by splicing and fixing screw rods, with a high degree of prefabrication; the pipe pile body is connected in multiple layers by using a stiffening connector and a T-shaped joint connecting rod, which improves the connection between the pipe pile bodies, has high structural stability, and a wide range of applications.

Description

Technical Field

[0001] The present invention relates to the construction of tower crane foundations, and specifically to a construction method for a combined steel structure tower crane foundation with a deep foundation pit and a core pipe pile support. Background Art

[0002] Tower cranes are the most commonly used vertical and horizontal transportation tools in construction. With the continuous increase in deep foundation pit projects, higher requirements have been put forward for the installation, use, connection, and demolition of tower crane foundations. Traditional reinforced concrete tower crane foundations have gradually been replaced by steel structure platforms due to problems such as long construction periods, high costs, difficult demolition, and resource waste.

[0003] Patent application CN202020617580.X discloses a tower crane foundation platform. The tower crane foundation platform includes pipe piles, and the pipe piles are connected to each corner of the quadrilateral support platform through I-shaped connectors; during use, only the pipe piles need to be buried underground for fixation. The structure is simple, easy to produce and manufacture, convenient to use, and easy to promote; however, the I-shaped connectors are welded to the pipe piles, and it is difficult to remove the pipe piles and the I-shaped connectors subsequently. The number of times of turnover and reuse after demolition is small, and there are many open-fire operations during welding construction, which is not conducive to construction safety; the quadrilateral support platform is composed of a frame and a cross-shaped beam, with fixed structural dimensions. It is difficult to transport and handle on-site, and the tower crane foundation platform cannot be adjusted. The space between the platforms is large, and there are great risks during construction. For deep foundation pit projects using large tower cranes, the platform needs to be further checked and reinforced; at the same time, the pipe piles are only connected at the pile head part. As the excavation progresses, the pile body of the pipe piles also needs to be further connected and reinforced to ensure the stability of the tower crane foundation. Summary of the Invention

[0004] The purpose of the present invention is to propose a construction method for a combined steel structure tower crane foundation with a deep foundation pit and a core pipe pile support in view of the problems existing in the construction of steel structure tower crane foundations for deep foundation pit projects, and the following technical solutions are adopted.

[0005] A construction method for a combined steel structure tower crane foundation with a deep foundation pit and a core pipe pile support includes the following steps:

[0006] S1. Pipe pile construction: According to the construction requirements, lay out the lines at the four corners of the tower crane foundation, and respectively carry out the insertion construction of the pipe piles;

[0007] S2. Stiffening core construction: S2.1. Manufacture a stiffening steel reinforcement cage with a bottom plate, set a threaded screw at the upper end of the stiffening steel reinforcement cage, and install an annular sealing ring around the bottom plate; S2.2. Place the stiffening steel reinforcement cage inside the pipe pile, adjust the position of the stiffening steel reinforcement cage according to the construction drawings, and make the top of the stiffening steel reinforcement cage 5 cm higher than the top of the pipe pile; S2.3. Fix the top of the stiffening steel reinforcement cage with a temporary support, and pour concrete in the space of the pipe pile above the bottom plate. After reaching the strength, remove the temporary support;

[0008] S3. Processing of the components of the combined steel structure tower crane foundation: Process the unique pipe pile adapter, corner column connector, stiffening connector, I-shaped side beam, platform beam combined structure, rotating structure, splint, and T-shaped joint connecting rod according to the dimensions.

[0009] S4. Installation of the pipe pile adapter and corner column connector at the corner of the platform: S4.1. Install the pipe pile adapters on the top of the pipe piles respectively. The stiffening steel cage passes through the conversion bottom plate at the bottom of the pipe pile adapter and passes out through the perforations of the main bars in the connecting groove. S4.2. Tighten the pipe pile adapter so that it is tightly pressed against the top of the pipe pile, and install the main bar fixing nut at the threaded end of the upper end of the stiffening steel cage. S4.3. Pour the sealing mortar in the connecting groove to protect the stiffening steel cage and the main bar fixing nut. The top surface of the sealing mortar is flush with the conversion top plate. S4.4. Install the corner column connector on the upper part of the pipe pile adapter through the splicing fixing screw, and make it fit tightly through the splicing fixing nut.

[0010] S5. Primary installation of the I-shaped side beam: Install two symmetrical I-shaped side beams on the corner column connector, and screw the beam connecting screws into the threaded holes to fix the I-shaped side beam in the I-shaped groove of the corner column connector.

[0011] S6. Installation of the platform beam combined structure: S6.1. Lift the platform combined structure A into the web of the I-shaped side beam. The end plate of the main beam of the platform combined structure A is close to the I-shaped side beam. Fix each main beam of the platform combined structure A in turn with the beam connecting screws, and reinforce the platform combined structure A with gusset plates and beam connecting screws on the upper and lower flanges of the I-shaped side beam. S6.2. Rotate the splint on the platform combined structure B towards the side of the platform combined structure B. S6.3. Lift the platform combined structure B into the web of the symmetrical I-shaped side beam and fix it in the same way as the platform combined structure A. S6.4. Rotate the splint on the platform combined structure B to the side of the platform combined structure A. The splint holes on the upper splint correspond to the splint holes on the main beam of the platform combined structure A one by one. Pass the beam connecting screws through the splints on both sides and fix them with the beam fixing nuts. The platform combined structure A and the platform combined structure B form an integral body.

[0012] S7. Secondary installation of the I-shaped side beam: Install the other two I-shaped side beams on the side of the secondary beam of the platform beam combined structure. The web of the I-shaped side beam is close to the end plate of the web on the side of the secondary beam. Fix the two ends of the I-shaped side beam in the I-shaped groove of the corner column connector with the splicing fixing screws, then connect the I-shaped side beam and the secondary beam of the platform beam combined structure in turn with the beam connecting screws, and finally reinforce the I-shaped side beam with gusset plates at the top and bottom.

[0013] S8, Stiffening connection of pipe piles: S8.1, Install a stiffening connector at the bottom of the pipe pile adapter through splicing and fixing screws. The notch of the U-shaped groove section stiffening connector faces the side without a pipe pile; S8.2, Install protective connecting plates at the upper and lower ends of the open side of the U-shaped groove plate of the stiffening connector; S8.3, Install T-shaped joint connecting rods between adjacent pipe piles, and fix the T-shaped joint connecting rods in the chute of the T-shaped connecting groove block of the pipe pile; S8.4, When the height of the pipe pile protruding above the ground exceeds 2m, continue to splice downward using the stiffening connector and connect using the T-shaped joint connecting rod;

[0014] S9, Installation and construction of tower crane: Install a crane on the assembled platform beam combined structure and carry out subsequent construction.

[0015] Preferably, in S2, the top of the stiffening steel cage is higher than the bottom of the connection groove and lower than the top of the connection groove.

[0016] Preferably, in S3, the pipe pile adapter includes a conversion top plate, a connecting barrel body, and a conversion bottom plate. A circular connection groove is provided at the center of the top of the conversion top plate, and a through main reinforcement perforation is provided in the connection groove. The position of the main reinforcement perforation matches the main reinforcement of the stiffening steel cage. Between the conversion top plate and the conversion bottom plate, vertical stiffening rib plates are provided circumferentially along the connecting barrel body, and splicing and fixing holes are provided between the stiffening rib plates.

[0017] Preferably, in S3, the corner column connector includes a bottom flange end plate and an upper steel structure block. The upper steel structure block is provided with I-shaped grooves for side beams at the centers of the four sides, and threaded holes are provided at the tops of the I-shaped grooves.

[0018] Preferably, in S3, the stiffening connector includes a U-shaped groove plate and connection end plates at the upper and lower ends. The connection end plates are provided with splicing and fixing holes consistent with those of the pipe pile adapter. Triangular stiffening plates are provided at intervals of the splicing and fixing holes at the connection positions between the U-shaped groove plate and the upper and lower end connection end plates; The three sides of the U-shaped groove plate are provided with T-shaped connecting groove blocks. The distances between the upper and lower ends of the T-shaped connecting groove blocks and the connection end plates are greater than 10 cm to provide installation space for the T-shaped joint connecting rods.

[0019] Preferably, in the above-mentioned S3, the platform beam composite structure is composed of platform composite structure A and platform composite structure B, and both of them are composed of main beams and short secondary beams welded together. Among them, on both sides of the end plate of the main beam web at the splicing end of platform composite structure B, there are splints with rotating structures, and splint holes are provided on the splints; the rotating structure is composed of a rotating shaft and a rotating shell, the rotating shell is welded to the main beam web, a rotating shaft is arranged inside the rotating shell, and the rotating shaft can rotate relative to the rotating shell; platform composite structure A is provided with splint holes matching the splints at the splicing end of the main beam; at the connection end of the main beam with the I-shaped side beam, there is an extended web with a width half of the flange of the I-shaped side beam, and a web end plate with the same height as the web of the I-shaped side beam is provided at the end of the extended web, so that the connection end of the main beam penetrates into the web of the I-shaped side beam and fits completely; the secondary beams are arranged between the main beams, and weld seams are provided at the connection points between the secondary beams and the main beams to connect the main beams into a whole, and at the connection points between the secondary beams and the I-shaped side beams, there are extended webs and web end plates connected to the I-shaped side beam.

[0020] Preferably, in the above-mentioned S3, the I-shaped side beam is an I-shaped steel, and its size is the same as the I-shaped groove of the corner column connector. At the connection points between the I-shaped side beam and the main beam and secondary beam of the platform beam composite structure, beam connection holes are respectively provided on the web and the upper and lower flanges, and the cross-sectional size of the I-shaped side beam is the same as that of the main beam and secondary beam.

[0021] Preferably, in the above-mentioned S3, the T-shaped joint connecting rod is arranged inside the T-shaped connection groove block of the adjacent pipe pile stiffening connector, and T-shaped joints consistent with the internal sliding grooves of the T-shaped connection groove block are provided at both ends of the T-shaped joint connecting rod.

[0022] Preferably, in the above-mentioned S4 - S8, the splicing fixing screw is matched with the splicing fixing nut, the beam connection screw is matched with the beam fixing nut, and the splint connection screw is matched with the splint fixing nut.

[0023] The technical solution involved in the present invention has the following beneficial effects compared with the traditional technology:

[0024] 1. The pipe piles, pipe pile adapters, corner column connectors, I-shaped side beams, platform beam composite structures and stiffening connectors are all connected by bolts. There is no open flame operation at the construction site, and the construction safety is high; moreover, the bolt connection has high installation and removal efficiency, and the removal does not damage the steel members, which can increase the turnover times and reduce the use cost of the steel members.

[0025] 2. The tower crane foundation platform is divided into multiple parts such as corner column connectors, side beams, platform composite structure A, platform composite structure B, etc., which can improve the handling efficiency and installation efficiency and reduce the construction period.

[0026] 3. The pipe pile adapter and the pipe pile are fixed by the connection method of the stiffening core and the top main reinforcement fixing nut, and the connection is reliable, which can ensure the stability of subsequent construction.

[0027] 4. Install a corner column connector on the upper part of the pipe pile adapter head to enable the installation of the tower crane foundation platform. Install a stiffening connector on the lower part of the pipe pile adapter head to achieve the stiffening connection of the pile body. Each component can be connected by splicing and fixing screws, with a high degree of prefabrication.

[0028] 5. In addition to the connection at the top of the pipe pile, the pipe pile body is multi-layer connected using a stiffening connector and a T-shaped joint connecting rod, improving the connection between the pipe pile bodies, with high structural stability and load-bearing capacity, and can be applied to deep foundation pit projects with a wide range of applications.

[0029] 6. The four sides of the platform beam composite structure are inserted between the webs of the I-shaped side beams to strengthen the connection and limit displacement and deformation; and the I-shaped side beams are flush with the top of the platform beam composite structure, facilitating the use of gusset plates for reinforcement connection at the top of the I-shaped side beams and the platform beam composite structure.

[0030] 7. For tower crane foundations of different projects and different sizes, by extending the splicing end of the I-shaped side beam and the platform composite structure A, it can adapt to the connection of pipe piles with different spacings and achieve the adjustment of the tower crane foundation platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the structure of a composite steel structure tower crane foundation with a deep foundation pit and a core pipe pile support;

[0032] Figure 2 is a cross-sectional view of the pipe pile - pipe pile of the composite steel structure tower crane foundation with a deep foundation pit and a core pipe pile support;

[0033] Figure 3 is a detailed drawing of the connection nodes of the pipe pile adapter head, corner column connector, and I-shaped side beam ( Figure 1 detail drawing of node A in it);

[0034] Figure 4 is a detailed drawing of the connection nodes of the I-shaped side beam and the main beam ( Figure 1 detail drawing of node A in it);

[0035] Figure 5 is a detailed drawing of the connection nodes of the I-shaped side beam and the secondary beam ( Figure 1 detail drawing of node C in it);

[0036] Figure 6 is a detailed drawing of the connection nodes on the non-notch side of the pipe pile adapter head, corner column connector, and stiffening connector ( Figure 1 detail drawing of node D in it);

[0037] Figure 7 is a detailed drawing of the connection nodes on the notch side of the pipe pile adapter head, corner column connector, and stiffening connector ( Figure 1 detail drawing of node E in it);

[0038] Figure 8 is a side view schematic diagram of a single pipe pile and the pile body connection device;

[0039] Figure 9 It is a three-dimensional schematic diagram of a single pipe pile and a pile body connection device;

[0040] Figure 10 It is a schematic diagram of the structure of the corner column connector;

[0041] Figure 11 It is a schematic diagram of the structure of the pipe pile adapter;

[0042] Figure 12 It is a sectional view of the conversion top plate of the pipe pile adapter;

[0043] Figure 13 It is a sectional view of the connection cylinder body of the pipe pile adapter;

[0044] Figure 14 It is a side view schematic diagram of the stiffening connector;

[0045] Figure 15 It is a schematic diagram of the structure of the non-notch side of the stiffening connector;

[0046] Figure 16 It is a schematic diagram of the structure of the notch side of the stiffening connector;

[0047] Figure 17 It is a splicing schematic diagram of the stiffening connector;

[0048] Figure 18 It is a schematic diagram of the structure of the stiffening steel cage;

[0049] Figure 19 It is a schematic diagram of the combined structure of the platform beam;

[0050] Figure 20 It is a schematic diagram of the structure of the I-shaped side beam;

[0051] Figure 21 It is a schematic diagram of the structure of Platform Composite Structure A;

[0052] Figure 22 It is a schematic diagram of the structure of Platform Composite Structure B;

[0053] Figure 23 It is a detailed drawing of the connection node at the splint of Platform Composite Structure B ( Figure 19 Detail drawing of Node F);

[0054] Figure 24 It is a detailed drawing of the welded connection node of the main beam and the secondary beam ( Figure 19 Detail drawing of Node G);

[0055] Figure 25 It is a detailed drawing of the node at the splint of Platform Composite Structure B ( Figure 22 Detail drawing of Node H);

[0056] Figure 26It is the side view of the connection node at the splint of the platform combined structure (when the splints are connected);

[0057] Figure 27 It is the side view of the connection node at the splint of the platform combined structure (when the splints are not connected);

[0058] Figure 28 It is the sectional view of the connection node at the splint of the platform combined structure (when the splints are connected);

[0059] Figure 29 It is the construction schematic diagram of step S1;

[0060] Figure 30 . It is the construction schematic diagram of the pipe pile adapter in step S4;

[0061] Figure 31 It is the detailed drawing of the connection node of the stiffening steel cage and the pipe pile adapter ( Figure 30 detail drawing of node I in

[0062] Figure 32 It is the construction schematic diagram of the corner column connector in step S4;

[0063] Figure 33 It is the construction schematic diagram of step S5;

[0064] Figure 34 It is the construction schematic diagram of step S6;

[0065] Figure 35 It is the construction schematic diagram of step S7;

[0066] Figure 36 It is the construction method flow chart of the combined steel structure tower crane foundation with a reinforced core pipe pile support in a deep foundation pit.

[0067] Labels in the figure: 1 - pipe pile, 2 - stiffening core, 201 - stiffening steel cage, 202 - supporting plate, 203 - sealing ring, 204 - concrete, 205 - threaded screw, 3 - pipe pile adapter, 301 - adapter top plate, 302 - connecting cylinder body, 303 - adapter bottom plate, 304 - stiffening rib plate, 305 - connecting groove, 306 - main reinforcement perforation, 4 - sealing mortar, 5 - corner column connector, 501 - flange end plate, 502 - I-shaped groove, 503 - threaded hole, 504 - steel structure block, 6 - stiffening connector, 601 - connecting end plate, 602 - U-shaped groove plate, 603 - triangular stiffening plate, 604 - T-shaped connecting groove block, 605 - protective connecting plate, 606 - sliding groove, 7 - I-shaped side beam, 8 - platform beam composite structure, 801 - platform composite structure A, 802 - platform composite structure B, 803 - main beam, 804 - secondary beam, 805 - batten plate, 806 - web end plate, 807 - extended web, 9 - rotating structure, 901 - rotating shaft, 902 - rotating shell, 10 - clamping plate, 11 - weld seam, 12 - connecting screw, 1201 - splicing fixing screw, 1202 - beam connecting screw, 1203 - clamping plate connecting screw, 13 - T-shaped joint connecting rod, 14 - fixing nut, 1401 - splicing fixing nut, 1403 - clamping plate fixing nut, 1404 - main reinforcement fixing nut, 15 - bolt hole, 1501 - splicing fixing hole, 1502 - beam connecting hole, 1503 - clamping plate hole. Detailed implementation mode

[0068] To deepen the understanding of the present invention, the following will refer to Figures 1 to 36 and make a detailed description of the embodiments of the present invention. The following embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation modes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0069] In this embodiment, the diameter of the pipe pile 1 is 0.5 m, the layout spacing of the pipe piles 1 is 5 m × 5 m, the designed length of the stiffening core 2 is 3 m, the exposed height of the pipe pile 1 is 5 cm, the cross-sections of the pipe pile adapter 3, the corner column connector 5, and the stiffening connector 6 are all squares with a side length of 0.65 m. Among them, the height of the pipe pile adapter 3 is 0.5 m, the height of the corner column connector 5 is 0.4 m, the height of the stiffening connector 6 is 1 m, the cross-section heights of the I-shaped side beam 7, the main beam 803, and the secondary beam 804 are all 0.38 m, and the platform beam composite structure 8 is composed of four main beams 803 and four secondary beams 804 in the longitudinal and transverse directions.

[0070] Combined with the attached Figure 36 shown, the construction method of the combined steel structure tower crane foundation with a reinforced core pipe pile for deep foundation pits includes the following steps.

[0071] S1. Construction of the pipe pile 1: Combined with the attached Figure 29 shown, according to the construction requirements, lay out the lines at the four corners of the tower crane foundation, and respectively carry out the insertion construction of the pipe pile 1.

[0072] S2. Construction of the stiffening core 2: Combine with the attached Figure 8 , the attached Figure 18 , the attached Figure 31 As shown, in S2.1, fabricate the stiffening steel cage 201 with a bottom pallet 202. A threaded screw 205 is provided at the upper end of the stiffening steel cage 201, and an annular sealing ring 203 is installed around the pallet 202; in S2.2, place the stiffening steel cage 201 inside the pipe pile 1, adjust the position of the stiffening steel cage 201 according to the construction drawings, and make the top of the stiffening steel cage 201 5 cm higher than the top of the pipe pile 1. Then, combine with the attached Figure 31 As shown, the top of the stiffening steel cage 201 is higher than the bottom of the connection groove 305 and lower than the top of the connection groove 305; in S2.3, fix the top of the stiffening steel cage 201 with a temporary support, pour concrete 204 in the space of the pipe pile 1 above the pallet 202 to form the stiffening core 2, and remove the temporary support after reaching the strength.

[0073] S3. Processing of the combined steel structure tower crane foundation components: Process the unique pipe pile adapter 3, corner column connector 5, stiffening connector 6, I-shaped side beam 7, platform beam combination structure 8, rotating structure 9, splint 10, and T-shaped joint connecting rod 13 according to the dimensions.

[0074] Combine with the attached Figure 11 ~the attached Figure 13 As shown, the pipe pile adapter 3 consists of a conversion top plate 301, a connecting barrel body 302, and a conversion bottom plate 303. A circular connection groove 305 is provided at the center of the top of the conversion top plate 301, and a through main reinforcement perforation 306 is provided in the connection groove 305. The position of the main reinforcement perforation 306 matches the main reinforcement of the stiffening steel cage 201. Between the conversion top plate 301 and the conversion bottom plate 303, vertical stiffening rib plates 304 are provided circumferentially along the connecting barrel body 302, and splicing fixing holes 1501 are provided between the stiffening rib plates 304.

[0075] Combine with the attached Figure 10 As shown, the corner column connector 5 includes a bottom flange end plate 501 and an upper steel structure block 504. The upper steel structure block 504 is provided with an I-shaped groove 502 for the side beam at the center of the four sides, and a threaded hole 503 is provided at the top of the I-shaped groove 502.

[0076] Combine with the attached Figure 14 ~the attached Figure 17As shown, the stiffening connector 6 includes a U-shaped groove plate 602 and connection end plates 601 at the upper and lower ends. The connection end plates 601 are provided with splicing fixing holes 1501 that are the same as those of the pipe pile adapter 3, and triangular stiffening plates 603 are provided at intervals of the splicing fixing holes 1501 at the connection positions of the U-shaped groove plate 602 and the upper and lower end connection end plates 601; three sides of the U-shaped groove plate 602 are provided with T-shaped connection groove blocks 604, and the distances between the upper and lower ends of the T-shaped connection groove blocks 604 and the connection end 601 are greater than 10 cm, providing an installation space for the T-shaped joint connecting rod 13.

[0077] Combined with the attached Figure 19 、attachment Figure 21 、attachment Figure 22 As shown, the platform beam combined structure 8 is composed of a platform combined structure A801 and a platform combined structure B802, and both are composed of main beams 803 and short secondary beams 804 welded together. Among them, on both sides of the end plate 806 of the web of the main beam 803 at the splicing end of the platform combined structure B802, there are clamping plates 10 with a rotating structure 9, and the clamping plates 10 are provided with clamping plate holes 1503; combined with the attached Figure 26 、attachment Figure 27 、attachment Figure 28 As shown, the rotating structure 9 is composed of a rotating shaft 901 and a rotating shell 902. The rotating shell 902 is welded to the web of the main beam 803, and the rotating shaft 901 is arranged inside the rotating shell 902, and the rotating shaft 901 can rotate relative to the rotating shell 902; combined with the attached Figure 23 、attachment Figure 25 As shown, the platform combined structure A801 is provided with clamping plate holes 1503 that match the clamping plates 10 at the splicing end of the main beam 803; the main beam 803 is provided with an extended web 807 with a width half of the flange of the I-shaped side beam 7 at the connection end with the I-shaped side beam 7, and a web end plate 806 with the same height as the web of the I-shaped side beam 7 is provided at the end of the extended web 807, so that the connection end of the main beam 803 extends into the web of the I-shaped side beam 7 and is completely fitted; combined with the attached Figure 24 As shown, the secondary beam 804 is arranged between the main beams 803. A weld seam 11 is provided at the connection between the secondary beam 804 and the main beam 803 to connect the main beams into a whole, and an extended web 807 and a web end plate 806 for connecting with the I-shaped side beam 7 are provided at the connection between the secondary beam 804 and the I-shaped side beam 7.

[0078] Combined with the attached Figure 20 As shown, the I-shaped side beam 7 is an I-shaped steel, and its dimensions are the same as those of the I-shaped groove 502 of the corner column connector 5. At the connection positions of the I-shaped side beam 7 with the main beam 803 and the secondary beam 804 of the platform beam combined structure 8, beam connection holes 1502 are respectively provided on the web and the upper and lower flanges, and the cross-sectional size of the I-shaped side beam 7 is the same as that of the main beam 803 and the secondary beam 804.

[0079] Combined with the attached Figure 8 、attachment Figure 9As shown, the T-shaped joint connecting rod 13 is arranged inside the T-shaped connecting groove block 604 of the adjacent pipe pile 1 stiffening joint, and T-shaped joints consistent with the internal sliding grooves 606 of the T-shaped connecting groove block 604 are provided at both ends of the T-shaped joint connecting rod 13.

[0080] S4. Installation of the platform corner pipe pile adapter 3 and the corner column joint 5: Referring to the attached Figure 30 and the attached Figure 31 As shown, S4.1. Install the pipe pile adapters 3 on the tops of the pipe piles 1 respectively. The stiffening steel cage 201 passes through the bottom conversion base plate 303 of the pipe pile adapter 3 and passes out through the main reinforcement perforation 306 of the connection groove 305; S4.2. Press the pipe pile adapter 3 to make it tightly pressed against the top of the pipe pile 1, and install the main reinforcement fixing nut 1404 at the threaded screw 205 at the upper end of the stiffening steel cage 201; S4.3. Pour the sealing mortar 4 into the connection groove 305 to protect the stiffening steel cage 201 and the main reinforcement fixing nut 1404. The top surface of the sealing mortar 4 is flush with the conversion top plate 301; Then referring to the attached Figure 32 As shown, S4.4. Install the corner column joint 5 on the upper part of the pipe pile adapter 3 through the splicing fixing screw 1201 and make it fit tightly through the splicing fixing nut 1401.

[0081] S5. Primary installation of the I-shaped side beam 7: Referring to the attached Figure 3 and the attached Figure 33 As shown, install two symmetric I-shaped side beams 7 on the corner column joint 5, and screw the beam connection screw 1202 into the threaded hole 503 to fix the I-shaped side beam 7 in the I-shaped groove 502 of the corner column joint 5.

[0082] S6. Installation of the platform beam composite structure 8: Referring to the attached Figure 4 and the attached Figure 5 and the attached Figure 34 As shown, S6.1. Lift and place the platform composite structure A801 into the web of the I-shaped side beam 7. The end web end plate 806 of the main beam 803 of the platform composite structure A801 is closely attached to the I-shaped side beam 7. Fix each main beam 803 of the platform composite structure A801 in sequence with the beam connection screw 1202, and reinforce the platform composite structure A801 with the gusset plate 805 and the beam connection screw 1202 on the upper and lower flanges of the I-shaped side beam 7; Referring to the attached Figure 25 As shown, S6.2. Rotate the clamp 10 on the platform composite structure B802 towards the side of the platform composite structure B802; S6.3. Lift and place the platform composite structure B802 into the web of the symmetric I-shaped side beam 7 and fix it according to the fixing method of the platform composite structure A801; Referring to the attached Figure 23As shown in the figure, in S6.4, rotate the clamping plate 10 on the platform combined structure B802 to the side of the platform combined structure A801. The clamping plate holes 1503 on the clamping plate 10 correspond one by one to the clamping plate holes 1503 on the main beam 804 of the platform combined structure A801. Pass the beam connection screw 1202 through the clamping plates 10 on both sides and fix it with the beam fixing nut, so that the platform combined structure A801 and the platform combined structure B802 form an integral body.

[0083] S7. Secondary installation of the I-shaped side beam 7: Combine with the attached Figure 35 As shown in the figure, install another two I-shaped side beams 7 on the side of the secondary beam 804 of the platform beam combined structure 8. The web of the I-shaped side beam 7 is closely attached to the end plate 806 on the side web of the secondary beam 804. Both ends of the I-shaped side beam 7 are fixed in the I-shaped groove 502 of the corner column connector 5 by the splicing fixing screw 1201. Then, connect the I-shaped side beam 7 and the secondary beam 804 of the platform beam combined structure 8 in turn with the beam connection screw 1202. Finally, reinforce the top and bottom of the I-shaped side beam 7 with the gusset plate 805.

[0084] S8. Stiffening connection of the pipe pile 1: Combine with the attached Figure 6 ~Attached Figure 9 As shown in the figure, in S8.1, install the stiffening connection head 6 at the bottom of the pipe pile adapter 3 through the splicing fixing screw 1201. The notch of the U-shaped groove section of the stiffening connection head 6 faces the side where the pipe pile 1 is not provided; in S8.2, install the protective connection plates 605 at the upper and lower ends of the opening side of the U-shaped groove plate 602 of the stiffening connection head 6; in S8.3, install the T-shaped joint connecting rod 13 between adjacent pipe piles 1, and the T-shaped joint connecting rod 13 is respectively fixed in the sliding groove 606 of the T-shaped connection groove block 604 of the pipe pile 1; in S8.4, when the height of the pipe pile 1 protruding above the ground exceeds 2m, continue to splice downward with the stiffening connection head 6 and connect with the T-shaped joint connecting rod 13.

[0085] S9. Installation and construction of the tower crane: Combine with the attached Figure 1 、Attached Figure 2 As shown in the figure, install a crane on the assembled platform beam combined structure 8 and carry out subsequent construction.

[0086] Combine with the attached Figure 3 ~Attached Figure 9 、Attached Figure 23 、Attached Figure 28 As shown in the figure, in S4~S8, the splicing fixing screw 1201 matches the splicing fixing nut 1401, the beam connection screw 1202 matches the beam fixing nut, and the clamping plate connection screw 1203 matches the clamping plate fixing nut 1403.

[0087] The above embodiments are only used to explain the technical concept of the present invention, rather than limiting the protection scope of the rights of the present invention. Any non-substantive modification of the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. Construction method of a combined steel structure tower crane foundation with a core pipe pile support for deep foundation pits, characterized in that, It includes the following steps: S1. Construction of pipe piles (1): According to the construction requirements, lay out lines at the four corners of the tower crane foundation, and respectively carry out the insertion construction of pipe piles (1); S2. Construction of stiffening cores (2): S2.

1. Fabricate a stiffening steel cage (201) with a bottom plate (202). Threaded screw threads (205) are provided at the upper end of the stiffening steel cage (201), and annular sealing rings (203) are installed around the plate (202); S2.

2. Place the stiffening steel cage (201) inside the pipe pile (1), adjust the position of the stiffening steel cage (201) according to the construction drawings, and make the top of the stiffening steel cage (201) 5 cm higher than the top of the pipe pile (1); S2.

3. Fix the top of the stiffening steel cage (201) with temporary supports, and pour concrete (204) in the space of the pipe pile (1) above the plate (202) to form a stiffening core (2), and remove the temporary supports after reaching the strength; S3. Processing of combined steel structure tower crane foundation components: Process special pipe pile adapters (3), corner column connectors (5), stiffening connectors (6), I-shaped side beams (7), platform beam combination structures (8), rotating structures (9), clamping plates (10), and T-shaped joint connecting rods (13) according to the dimensions; The pipe pile adapter (3) includes a conversion top plate (301), a connecting cylinder body (302), and a conversion bottom plate (303). A circular connecting groove (305) is provided at the center of the top of the conversion top plate (301), and a through main reinforcement perforation (306) is provided in the connecting groove (305). The position of the main reinforcement perforation (306) matches the main reinforcement of the stiffening steel cage (201). Between the conversion top plate (301) and the conversion bottom plate (303), vertical stiffening rib plates (304) are provided circumferentially along the connecting cylinder body (302), and splicing fixing holes (1501) are provided between the stiffening rib plates (304); The corner column connector (5) includes a bottom flange end plate (501) and an upper steel structure block (504). I-shaped grooves for side beams (502) are provided at the centers of the four sides of the upper steel structure block (504), and threaded holes (503) are provided at the tops of the I-shaped grooves (502); The stiffening connector (6) includes a U-shaped groove plate (602) and connecting end plates (601) at the upper and lower ends. Splicing fixing holes (1501) identical to those of the pipe pile adapter (3) are provided on the connecting end plates (601), and triangular stiffening plates (603) are provided at intervals of the splicing fixing holes (1501) at the connection positions of the U-shaped groove plate (602) and the upper and lower connecting end plates (601); Three sides of the U-shaped groove plate (602) are provided with T-shaped connecting groove blocks (604). The distances between the upper and lower ends of the T-shaped connecting groove blocks (604) and the connecting end plates (601) are greater than 10 cm to provide an installation space for the T-shaped joint connecting rod (13); S4. Installation of the pipe pile adapter (3) and corner column connector (X) at the platform corners: S4.

1. Install the pipe pile adapters (3) respectively on the tops of the pipe piles (1). The stiffening steel cage (201) passes through the bottom conversion bottom plate (303) of the pipe pile adapter (3) and passes out through the main reinforcement perforation (306) of the connecting groove (305); S4.

2. Compact the pipe pile adapter (3) to tightly press it against the top of the pipe pile (1), and install the main reinforcement fixing nut (1404) at the threaded screw (205) at the upper end of the stiffening steel reinforcement cage (201); S4.

3. Pour the sealing mortar (4) into the connection groove (305) to protect the stiffening steel reinforcement cage (201) and the main reinforcement fixing nut (1404), and the top surface of the sealing mortar (4) is flush with the conversion top plate (301); S4.

4. Install the corner column connector (5) on the upper part of the pipe pile adapter (3) through the splicing fixing screw (1201), and make it fit tightly through the splicing fixing nut (1401); S5. One-time installation of the I-shaped side beam (7): Install two symmetrical I-shaped side beams (7) on the corner column connector (5), and screw the beam connection screw (1202) into the threaded hole (503) to fix the I-shaped side beam (7) in the I-shaped groove (502) of the corner column connector (5); S6. Installation of the platform beam combined structure (8): The platform beam combined structure (8) consists of a platform combined structure A (801) and a platform combined structure B (802), and both are composed of a main beam (803) and a short secondary beam (804) welded together; the secondary beam (804) is arranged between the main beams (803), and a weld seam (11) is provided at the connection between the secondary beam (804) and the main beam (803) to connect the main beams (803) into a whole; the platform combined structure A (801) is provided with a splint hole (1503) matching the splint (10) at the splicing end of the main beam (803); the platform combined structure B (802) is provided with splints (10) with a rotating structure (9) on both sides of the end plate (806) of the web of the main beam (803) at the splicing end, and the splints (10) are provided with splint holes (1503); S6.

1. Lift and place the platform combined structure A (801) into the web of the I-shaped side beam (7), and the end plate (806) of the web of the main beam (803) of the platform combined structure A (801) is close to the I-shaped side beam (7). Use the beam connection screw (1202) to fix each main beam (803) of the platform combined structure A (801) in turn, and use the batten plate (805) and the beam connection screw (1202) to reinforce the platform combined structure A (801) on the upper and lower flanges of the I-shaped side beam (7); S6.

2. Rotate the splint (10) on the platform combined structure B (802) towards the side of the platform combined structure B (802); S6.

3. Lift and place the platform combined structure B (802) into the web of the symmetrical I-shaped side beam (7), and fix it in the same way as the platform combined structure A (801); S6.

4. Rotate the splint (10) on the platform combined structure B (802) to the side of the platform combined structure A (801). The splint holes (1503) on the splint (10) correspond to the splint holes (1503) on the main beam (803) of the platform combined structure A (801) one by one. Use the beam connection screw (1202) to pass through the splints (10) on both sides and fix them with the beam fixing nut, and the platform combined structure A (801) and the platform combined structure B (8 S7. Secondary installation of the I-shaped side beam (7): Install another two I-shaped side beams (7) on the side of the secondary beam (804) of the platform beam combined structure (8), and press the web of the I-shaped side beam (7) tightly against the web end plate (806) on the side of the secondary beam (804); fix both ends of the I-shaped side beam (7) in the I-shaped groove (502) of the corner column connector (5) using splicing fixing screws (1201), then connect the I-shaped side beam (7) and the secondary beam (804) of the platform beam combined structure (8) in sequence using beam connection screws (1202), and finally reinforce the top and bottom of the I-shaped side beam (7) using gusset plates (805); S8. Stiffening connection of the pipe pile (1): S8.

1. Install a stiffening connector (6) at the bottom of the pipe pile adapter (3) using splicing fixing screws (1201), with the notch of the U-shaped groove section stiffening connector (6) facing the side without the pipe pile (1); S8.

2. Install protective connection plates (605) at the upper and lower ends of the open side of the U-shaped groove plate (602) of the stiffening connector (6); S8.

3. Install a T-shaped joint connecting rod (13) between adjacent pipe piles (1), and fix the T-shaped joint connecting rod (13) in the sliding grooves (606) of the T-shaped connection groove blocks (604) of the pipe piles (1) respectively; S8.

4. When the height of the pipe pile (1) protruding above the ground exceeds 2 m, continue to splice downward using the stiffening connector (6) and connect using the T-shaped joint connecting rod (13); S9. Tower crane installation and construction: Install a crane on the assembled platform beam combined structure (8) and carry out subsequent construction.

2. The construction method of the combined steel structure tower crane foundation with reinforced core pipe piles for deep foundation pits according to claim 1, wherein, In S2 described above, the top of the stiffening steel cage (201) is higher than the bottom of the connection groove (305) and lower than the top of the connection groove (305).

3. The construction method of the combined steel structure tower crane foundation with reinforced core pipe piles for deep foundation pits according to claim 1, characterized in that, In S3 described above, the rotating structure (9) consists of a rotating shaft (901) and a rotating shell (902). The rotating shell (902) is welded to the web of the main beam (803), and the rotating shaft (901) is arranged inside the rotating shell (902) and can rotate relative to the rotating shell (902); at the connection end of the main beam (803) and the I-shaped side beam (7), there is an extended web (807) with a width half of the flange of the I-shaped side beam (7), and a web end plate (806) with the same height as the web of the I-shaped side beam (7) is provided at the end of the extended web (807), so that the connection end of the main beam (803) extends into the web of the I-shaped side beam (7) and fits completely; at the connection of the secondary beam (804) and the I-shaped side beam (7), there are an extended web (807) and a web end plate (806) connected to the I-shaped side beam (7).

4. The construction method of the combined steel structure tower crane foundation with core pipe piles for deep foundation pits according to claim 1, characterized in that, In S3 described above, the I-shaped side beam (7) is an I-shaped steel section, with dimensions consistent with the I-shaped groove (502) of the corner column connector (5). At the connections of the I-shaped side beam (7) with the main beam (803) and the secondary beam (804) of the platform beam combined structure (8), beam connection holes (1502) are provided on the web and the upper and lower flanges respectively, and the cross-sectional size of the I-shaped side beam (7) is consistent with that of the main beam (803) and the secondary beam (804).

5. The construction method of the combined steel structure tower crane foundation with a core pipe pile support for a deep foundation pit according to claim 1, characterized in that, In the above-mentioned S3, the T-shaped joint connecting rod (13) is arranged inside the T-shaped connecting groove block (604) of the stiffening connecting head (6) of adjacent pipe piles (1), and T-shaped joints consistent with the internal sliding grooves (606) of the T-shaped connecting groove block (604) are provided at both ends of the T-shaped joint connecting rod (13).

6. The construction method of the combined steel structure tower crane foundation with a core pipe pile support for a deep foundation pit according to claim 1, characterized in that, In the above-mentioned S4 to S8, the splicing fixing screw (1201) matches the splicing fixing nut (1401), the beam connecting screw (1202) matches the beam fixing nut, and the splint connecting screw (1203) matches the splint fixing nut (1403).

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