CN116290066A - Construction method for deep foundation pit core-added pile support combined type steel structure tower crane foundation - Google Patents

Abstract

The invention relates to a construction method of a deep foundation pit core-added pile supporting combined type steel structure tower crane foundation, which comprises nine construction steps of tubular pile construction, stiffening core construction, combined type steel structure tower crane foundation member processing, platform corner tubular pile conversion head and corner column connector installation, I-shaped side beam primary installation, platform beam combined structure installation, I-shaped side beam secondary installation, tubular pile stiffening connection, tower crane installation and construction; the tower crane foundation platform is divided into a plurality of parts such as corner post connectors, side beams, platform combined structures and the like, so that the carrying efficiency can be improved, and the installation difficulty can be reduced; the upper part of the tubular pile conversion head is provided with a corner post connector to realize the installation of a tower crane foundation platform, the lower part of the tubular pile conversion head is provided with a stiffening connector to realize the stiffening connection of a pile body, all the components are connected by adopting a splicing fixing screw rod, and the assembly degree is high; the pile body of the tubular pile adopts the stiffening connectors and the T-shaped connector connecting rods to carry out multi-layer connection, so that the connection between the pile bodies of the tubular pile is improved, the structural stability is high, and the application range is wide.

Description

Construction method for deep foundation pit core-added pile support combined type steel structure tower crane foundation

Technical Field

The invention relates to tower crane foundation construction, in particular to a construction method of a deep foundation pit core-added pile support combined steel structure tower crane foundation.

Background

Tower cranes are the most commonly used vertical and horizontal transport means in construction. Along with the continuous increase of deep foundation pit projects, higher requirements are put forward on the installation, use, connection and dismantling of tower crane foundations. The traditional reinforced concrete tower crane foundation is gradually replaced by a steel structure platform due to the problems of long construction period, high cost, difficult dismantling, resource waste and the like.

Patent application CN202020617580.X discloses a tower crane foundation platform, which comprises a tubular pile, wherein the tubular pile is connected with each corner of a quadrilateral supporting platform through an I-shaped connecting piece; when in use, the pipe pile is only needed to be buried underground for fixation, the structure is simple, the production and the manufacture are easy, the use is convenient, and the popularization is easy; however, the I-shaped connecting piece is welded with the pipe pile, the pipe pile and the I-shaped connecting piece are difficult to disassemble subsequently, the turnover use times are less after the disassembly, and the welding construction has more open fire operation, so that the construction safety is not facilitated; the quadrangular supporting platform is composed of a frame and a cross beam, the structural size is fixed, the on-site transportation and the transportation are difficult, the foundation platform of the tower crane cannot be adjusted, the gap of the platform is large, the construction is dangerous, and for the deep foundation pit project adopting a large crane, the platform needs to be further checked and reinforced; meanwhile, the tubular pile is connected only at the pile head part, and along with the progress of excavation, the tubular pile body of the tubular pile also needs further connection and reinforcement, so that the stability of the tower crane foundation is ensured.

Disclosure of Invention

The invention aims to solve the problems of the construction of a steel structure tower crane foundation of a deep foundation pit project, and provides a construction method of a composite steel structure tower crane foundation supported by a core pile of a deep foundation pit, which adopts the following technical scheme.

The construction method of the deep foundation pit core-added pile supporting combined steel structure tower crane foundation comprises the following steps:

s1, tubular pile construction: paying off four corners of the tower crane foundation according to construction requirements, and respectively performing pipe pile insertion construction;

s2, construction of stiffening cores: s2.1, manufacturing a stiffening reinforcement cage with a support plate at the bottom, arranging a threaded screw at the upper end part of the stiffening reinforcement cage, and installing an annular sealing ring around the support plate; s2.2, placing the stiffening reinforcement cage inside the tubular pile, adjusting the position of the stiffening reinforcement cage according to a construction drawing, and enabling the top of the stiffening reinforcement cage to be 5cm higher than the top of the tubular pile; s2.3, fixing the top of the stiffening reinforcement cage by adopting a temporary support, pouring concrete in a tubular pile space above the supporting plate, and removing the temporary support after reaching the strength;

s3, machining a foundation component of the combined steel structure tower crane: processing a special tubular pile conversion head, a corner post connector, a stiffening connector, an I-shaped side beam, a platform beam combined structure, a rotating structure, a clamping plate and a T-shaped connector connecting rod according to the size;

s4, mounting a platform corner pipe pile conversion head and a corner post connector: s4.1, respectively installing tubular pile conversion heads at the tops of the tubular piles, enabling stiffening reinforcement cages to penetrate through the bottom of the tubular pile conversion heads to convert bottom plates, and penetrating out from main reinforcement perforations of the connecting grooves; s4.2, pressing the tubular pile conversion head to press the tubular pile conversion head with the top of the tubular pile, and installing a main reinforcement fixing nut at a thread position at the upper end part of the stiffening reinforcement cage; s4.3, pouring sealing mortar in the connecting groove, protecting the stiffening reinforcement cage and the main reinforcement fixing nut, and enabling the top surface of the sealing mortar to be level with the conversion top plate; s4.4, installing a corner post connector at the upper part of the tubular pile conversion head through a splicing fixing screw, and tightly attaching and connecting the corner post connector through a splicing fixing nut;

s5, one-time installation of the I-shaped side beam: two symmetrical I-shaped side beams are arranged on the corner post connector, and the I-shaped side beams are fixed in the corner post connector model groove by adopting a beam connecting screw rod to screw into the threaded hole;

s6, mounting a platform beam combined structure: s6.1, hanging the platform combined structure A into an I-shaped side beam web, attaching a web end plate at the end part of a main beam of the platform combined structure A to the I-shaped side beam, sequentially fixing all main beams of the platform combined structure A by adopting beam connecting screws, and reinforcing the platform combined structure A by adopting lacing plates and beam connecting screws on the upper flange and the lower flange of the I-shaped side beam; s6.2, rotating the clamping plate on the platform combined structure B towards the side of the platform combined structure B; s6.3, hanging the platform combined structure B into the symmetrical side I-shaped side beam web plate, and fixing according to the fixing mode of the platform combined structure A; s6.4, rotating the clamping plates on the platform combination structure B to the side of the platform combination structure A, wherein clamping plate holes on the clamping plates correspond to clamping plate holes on secondary beams of the platform combination structure A one by one, beam connecting screws penetrate through clamping plates on two sides and are fixed by combining beam fixing nuts, and the platform combination structure A and the platform combination structure B form a whole;

s7, secondary installation of the I-shaped side beam: installing two other I-shaped side beams on the secondary beam side of the platform beam combined structure, and tightly attaching the I-shaped side beam web plates to the secondary beam side web plate end plates; the two ends of the I-shaped side beam are fixed in the corner post connector type groove by adopting splicing fixing screws, then the beam connecting screws are sequentially adopted to connect the I-shaped side beam and the secondary beam of the platform beam combined structure, and finally the top and the bottom of the I-shaped side beam are reinforced by adopting lacing plates;

s8, tubular pile stiffening connection: s8.1, installing a stiffening connector at the bottom of the tubular pile conversion head through a splicing fixing screw, wherein the notch of the stiffening connector with the U-shaped groove section faces to the side where the tubular pile is not arranged; s8.2, respectively installing protective connecting plates at the upper end and the lower end of the U-shaped groove plate opening side of the stiffening connector; s8.3, installing T-shaped joint connecting rods between adjacent tubular piles, wherein the T-shaped joint connecting rods are respectively fixed in the T-shaped connecting groove blocks of the tubular piles; s8.4, when the height of the pipe pile extending out of the ground exceeds 2m, continuing to splice downwards by adopting a stiffening connector, and connecting by adopting a T-shaped connector connecting rod;

s9, tower crane installation and construction: and installing a crane on the assembled platform beam combined structure, and carrying out subsequent construction.

Preferably, in the step S2, the top of the stiffening reinforcement cage is higher than the bottom of the connecting groove and lower than the top of the connecting groove.

Preferably, in the step S3, the tubular pile conversion head comprises a conversion top plate, a connection barrel body and a conversion bottom plate, wherein a circular connecting groove is formed in the center of the top of the conversion top plate, a penetrating main reinforcement perforation is formed in the connecting groove, the position of the main reinforcement perforation is matched with that of a stiffening reinforcement cage main reinforcement, a vertical stiffening rib plate is annularly arranged between the conversion top plate and the conversion bottom plate along the connection barrel body, and a splicing fixing hole is formed between the stiffening rib plates.

Preferably, in the step S3, the corner post connector includes a bottom flange end plate, an upper steel block, and the upper steel block is provided with a boundary beam shaped groove at the center of four sides, and a threaded hole is provided at the top of the shaped groove.

Preferably, in the step S3, the stiffening connector includes a U-shaped groove plate and connecting end plates at the upper and lower ends, splicing fixing holes consistent with the tubular pile conversion head are formed in the connecting end plates, and triangular stiffening plates are arranged at the connecting positions of the U-shaped groove plate and the connecting end plates at intervals; the three sides of the U-shaped groove plate are provided with T-shaped connecting groove blocks, the distance between the upper end and the lower end of each T-shaped connecting groove block and the connecting end plate is greater than 10cm, and an installation space is provided for the T-shaped connector connecting rod.

Preferably, in the step S3, the platform beam combined structure is formed by a platform combined structure a and a platform combined structure B, and both are formed by welding a main beam and a short secondary beam, wherein the platform combined structure B is provided with clamping plates with rotating structures on two sides of a web plate at the end part of the main beam at the splicing end, and clamping plate holes are formed in the clamping plates; the rotating structure consists of a rotating shaft and a rotating shell, the rotating shell is welded on the girder web, the rotating shaft is arranged in the rotating shell, and the rotating shaft can rotate relative to the rotating shell; the platform combined structure A is provided with a clamping plate hole matched with the clamping plate at the splicing end of the main beam; the girder is provided with an extension web plate which is half of the width of an I-shaped side beam flange at the connecting end of the girder and is provided with a web plate end plate which is the same as the I-shaped side beam web plate in height at the end part of the extension web plate, so that the connecting end of the girder penetrates into the I-shaped side beam web plate and is completely attached; the secondary beams are arranged between the main beams, welding seams are arranged at the joints of the secondary beams and the main beams to connect the main beams into a whole, and an extension web and a web end plate connected with the I-shaped side beams are arranged at the joints of the secondary beams and the I-shaped side beams.

Preferably, in the step S3, the i-beam is an i-beam, the size of the i-beam is identical to the shape groove of the corner post connector, the connection parts of the i-beam and the main beam and the secondary beam of the platform beam combined structure are respectively provided with beam connection holes on the web plate and the upper flange and the lower flange, and the section size of the i-beam is identical to the main beam and the secondary beam.

Preferably, in the step S3, the T-shaped connector connecting rod is disposed inside the T-shaped connecting groove block of the stiffening connector of the adjacent tubular pile, and two ends of the T-shaped connector connecting rod are provided with T-shaped connectors consistent with the sliding grooves inside the T-shaped connecting groove block.

Preferably, in S4 to S8, the splicing fixing screw is matched with the splicing fixing nut, the beam connecting screw is matched with the beam fixing nut, and the clamping plate connecting screw is matched with the clamping plate fixing nut.

Compared with the prior art, the technical scheme has the beneficial effects that:

1. the tubular pile, the tubular pile conversion head, the corner post connector, the I-shaped side beam, the platform beam combined structure and the stiffening connector are all connected by bolts, the construction site is free from open fire operation, and the construction safety is high; and the bolt connection installation and the dismantling efficiency are high, the dismantling is not damaged to the steel member, the turnover times can be increased, and the use cost of the steel member is reduced.

2. The tower crane foundation platform is divided into a corner post connector, a side beam, a platform combined structure A, a platform combined structure B and the like, so that the carrying efficiency and the mounting efficiency can be improved, and the construction period is shortened.

3. The tubular pile conversion head is fixed with the tubular pile through a stiffening core and a top main rib fixing nut, and the connection is reliable, so that the stability of subsequent construction can be ensured.

4. The corner post connector is arranged on the upper portion of the tubular pile conversion head, the installation of a tower crane foundation platform can be realized, the stiffening connector is arranged on the lower portion of the tubular pile conversion head, the stiffening connection of a pile body can be realized, all components are connected by adopting the splicing fixing screw rod, and the assembly degree is high.

5. Except that the pile top of the tubular pile is connected, the pile body of the tubular pile adopts a stiffening connector and a T-shaped connector connecting rod to carry out multilayer connection, so that the connection between the pile bodies of the tubular pile is improved, the structural stability is high, the bearing capacity is high, the pile body of the tubular pile is applicable to deep foundation pit projects, and the application range is wide.

6. Four sides of the platform beam combined structure are plugged between the webs of the I-shaped side beams, so that the connection is enhanced, and the displacement and the deformation are limited; and the top of the I-shaped side beam and the top of the platform beam combined structure are flush, so that the top of the I-shaped side beam and the top of the platform beam combined structure are conveniently reinforced and connected by adopting a batten plate.

7. For tower crane foundations of different projects and different sizes, the splicing ends of the lengthening I-shaped side beams and the platform combined structure A can adapt to the connection of pipe piles with different distances, and the adjustment of a tower crane foundation platform is realized.

Drawings

FIG. 1 is a schematic diagram of a deep foundation pit cored pipe pile supporting combined steel structure tower crane foundation structure;

FIG. 2 is a cross-sectional view of a pile-pipe pile of a deep foundation pit cored pipe pile supporting combined steel structure tower crane foundation;

fig. 3 is a detail view of a pipe pile conversion head, a corner post connector and an i-shaped side beam connecting node (a detail view of a node a in fig. 1);

FIG. 4 is a detail view of the joint of the I-beam and the main beam (detail view of the joint A in FIG. 1);

FIG. 5 is a detail of the connection node of the I-beam and the secondary beam (detail of the node C in FIG. 1);

FIG. 6 is a detail view of the non-slot side connection nodes of the tubular pile conversion head, corner post connectors and stiffening connectors (detail view of node D in FIG. 1);

FIG. 7 is a detail view of the pipe pile converting head, corner post connectors, stiffening connector notch side connection nodes (detail view of E node in FIG. 1);

FIG. 8 is a schematic side view of a single pipe pile and shaft connection;

FIG. 9 is a three-dimensional schematic view of a single pile and shaft connecting device;

FIG. 10 is a schematic view of a corner post connector;

fig. 11 is a schematic structural view of a pipe pile conversion head;

fig. 12 is a cross-sectional view of a tube stake converting head converting top plate;

FIG. 13 is a cross-sectional view of the tubular pile conversion head connecting barrel;

FIG. 14 is a schematic side view of a stiffening connector;

FIG. 15 is a schematic view of a non-rebated side structure of a stiffening connector;

FIG. 16 is a schematic view of a stiffener joint slot side structure;

FIG. 17 is a schematic view of a stiffener joint splice;

fig. 18 is a schematic view of a stiffening reinforcement cage structure;

FIG. 19 is a schematic view of a platform beam assembly;

FIG. 20 is a schematic view of an I-beam structure;

FIG. 21 is a schematic view of a platform assembly A;

FIG. 22 is a schematic view of a platform assembly B;

FIG. 23 is a detail of the connection node at the platform assembly clamp plate (detail of node F in FIG. 19);

FIG. 24 is a detail view of the joint between the weld joints of the main beam and the secondary beam (detail view of the joint G in FIG. 19);

FIG. 25 is a detail view of a node B (detail view of node H in FIG. 22) of the platform assembly B;

FIG. 26 is a side view of the connection node at the clamp plate of the platform assembly (with the clamp plate connected);

FIG. 27 is a side view of the connection node at the clamp plate of the platform assembly (with the clamp plate not connected);

FIG. 28 is a cross-sectional view of a connection node at a clamp plate of the platform assembly (with the clamp plate connected);

FIG. 29 is a schematic construction of step S1;

fig. 30 is a schematic view of the construction of the pipe pile conversion head in step S4;

fig. 31 is a detailed view of the connection nodes of the stiffening reinforcement cage and the tubular pile conversion head (detailed view of the node I in fig. 30);

FIG. 32 is a schematic view of the construction of the corner post connector at step S4;

FIG. 33 is a construction schematic of step S5;

FIG. 34 is a construction schematic of step S6;

FIG. 35 is a construction schematic of step S7;

FIG. 36 is a flow chart of a construction method of a deep foundation pit cored pipe pile supporting combined steel structure tower crane foundation.

The drawing is marked: 1-tubular pile, 2-stiffening core, 201-stiffening reinforcement cage, 202-supporting plate, 203-sealing ring, 204-concrete, 205-screw thread, 3-tubular pile conversion head, 301-conversion top plate, 302-connection barrel, 303-conversion bottom plate, 304-stiffening rib plate, 305-connection groove, 306-main rib perforation, 4-sealing mortar, 5-corner post connector, 501-flange end plate, 502-shaped groove, 503-threaded hole, 504-steel construction block, 6-stiffening connector, 601-connection end plate, 602-U-shaped groove plate, 603-triangular stiffening plate, 604-T-shaped connection groove block, 605-protection connection plate, 606-chute, 7-I-shaped side beam and 8-platform beam combined structure, 801-platform combination A, 802-platform combination B, 803-girder, 804-secondary beam, 805-batten plate, 806-web end plate, 807-elongated web, 9-rotating structure, 901-rotating shaft, 902-rotating shell, 10-clamp plate, 11-weld, 12-connecting screw, 1201-splice fixing screw, 1202-beam connecting screw, 1203-clamp plate connecting screw, 13-T-joint connecting rod, 14-fixing nut, 1401-splice fixing nut, 1402-beam fixing nut, 1403-clamp plate fixing nut, 1404-main bar fixing nut, 15-bolt hole, 1501-splice fixing hole, 1502-beam connecting hole, 1503-clamp plate hole.

Description of the embodiments

In order to enhance the understanding of the present invention, the following examples of the present invention will be described in detail with reference to fig. 1 to 36, and the following examples are implemented on the premise of the technical solution of the present invention, and detailed embodiments are given, but the scope of protection of the present invention is not limited to the following examples.

In this embodiment, the diameter of the pipe pile 1 is 0.5m, the arrangement space of the pipe pile 1 is 5m×5m, the design length of the stiffening core 2 is 3m, the height of the exposed pipe pile 1 is 5cm, the sections of the pipe pile conversion head 3, the corner post connectors 5 and the stiffening connectors 6 are square with side length of 0.65m, the height of the pipe pile conversion head 3 is 0.5m, the height of the corner post connectors 5 is 0.4m, the height of the stiffening connectors 6 is 1m, the heights of the sections of the I-shaped side beams 7, the main beams 803 and the secondary beams 804 are all 0.38m, and the platform beam combination structure 8 consists of longitudinal and transverse four main beams 803 and four secondary beams 804.

Referring to fig. 36, the construction method of the combined steel structure tower crane foundation supported by the core pile of the deep foundation pit comprises the following steps.

S1, constructing a tubular pile 1: referring to fig. 29, the pipe piles 1 are inserted into the tower crane foundation according to the construction requirements.

S2, construction of a stiffening core 2: referring to fig. 8, 18 and 31, S2.1, a stiffening reinforcement cage 201 with a pallet 202 at the bottom is manufactured, a thread 205 is arranged at the upper end of the stiffening reinforcement cage 201, and an annular sealing ring 203 is arranged around the pallet 201; s2.2, placing the stiffening reinforcement cage 201 inside the tubular pile 1, adjusting the position of the stiffening reinforcement cage 201 according to a construction drawing, enabling the top of the stiffening reinforcement cage 201 to be 5cm higher than the top of the tubular pile 1, and enabling the top of the stiffening reinforcement cage 201 to be higher than the bottom of the connecting groove 305 and lower than the top of the connecting groove 305 as shown in the attached drawing 31; s2.3, fixing the top of the stiffening reinforcement cage 201 by adopting a temporary support, pouring concrete 204 in the space of the tubular pile 1 above the supporting plate 202 to form a stiffening core 2, and removing the temporary support after reaching the strength.

S3, machining a foundation component of the combined steel structure tower crane: the special tubular pile conversion head 3, the corner post connector 5, the stiffening connector 6, the I-shaped side beam 7, the platform beam combined structure 8, the rotating structure 9, the clamping plate 10 and the T-shaped joint connecting rod 13 are processed according to the size.

Referring to fig. 11 to 13, the tubular pile conversion head 3 includes a conversion top plate 301, a connection barrel 302, and a conversion bottom plate 303, a circular connection groove 305 is provided at the top center of the conversion top plate 301, a through main reinforcement perforation 306 is provided in the connection groove 305, the position of the main reinforcement perforation 306 is matched with the main reinforcement of the stiffening reinforcement cage 201, a vertical stiffening rib 304 is provided between the conversion top plate 301 and the conversion bottom plate 303 along the circumferential direction of the connection barrel 302, and a splicing fixing hole 1501 is provided between the stiffening rib 304.

Referring to fig. 10, the corner post coupler 5 includes a bottom flange end plate 501, an upper steel block 504, the upper steel block 504 having a side beam-shaped groove 502 at the center of four sides, and a screw hole 503 at the top of the groove 502.

Referring to fig. 14 to 17, the stiffening connector 6 includes a U-shaped channel plate 602 and connecting end plates 601 at the upper and lower ends, the connecting end plates 601 are provided with splicing fixing holes 1501 consistent with the tubular pile converting heads 3, and triangular stiffening plates 603 are arranged at the connecting positions of the U-shaped channel plate 602 and the connecting end plates 601 at intervals; the three sides of the U-shaped groove plate 602 are provided with T-shaped connecting groove blocks 604, and the distance between the upper end and the lower end of each T-shaped connecting groove block 604 and the connecting end 601 is more than 10cm, so that an installation space is provided for the T-shaped joint connecting rod 13.

Referring to fig. 19, 21 and 22, 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 a main beam 803 and a short secondary beam 804 by welding, wherein the platform combined structure B802 is provided with clamping plates 10 with rotating structures 9 on two sides of a web 806 at the end part of the main beam 803 at the splicing end, and the clamping plates 10 are provided with clamping plate holes 1503; referring to fig. 26, 27 and 28, the rotating structure 9 is composed of a rotating shaft 901 and a rotating shell 902, the rotating shell 902 is welded to a web plate of the main beam 803, the rotating shaft 901 is arranged in the rotating shell 902, and the rotating shaft 901 can rotate relative to the rotating shell 902; referring to fig. 23 and 25 again, a clamping plate hole 1503 matched with the clamping plate 10 is formed at the splicing end of the main beam 803 in the platform combined structure a 801; the main beam 803 is provided with an extension web 807 which is half of the width of the flange of the I-shaped side beam 7 at the connecting end of the I-shaped side beam 7, and a web end plate 806 which is the same as the web of the I-shaped side beam 7 in height is arranged at the end part of the extension web 807, so that the connecting end of the main beam 803 extends into the web of the I-shaped side beam 7 and is completely attached; as shown in fig. 24, the secondary beams 804 are arranged between the main beams 803, the joints of the secondary beams 804 and the main beams 803 are provided with welding seams 11 for connecting the main beams into a whole, and the joints of the secondary beams 804 and the i-shaped side beams 7 are provided with an extension web 807 and a web end plate 806 which are connected with the i-shaped side beams 7.

Referring to fig. 20, the i-beam 7 is an i-beam, the size of which is consistent with the shape groove 502 of the corner post connector 5, beam connecting holes 1502 are respectively formed in the web plate and the upper and lower flanges at the connection parts of the i-beam 7 and the main beams 803 and the secondary beams 804 of the platform beam combined structure 8, and the section size of the i-beam 7 is consistent with the size of the main beams 803 and the secondary beams 804.

Referring to fig. 8 and 9, the T-joint connecting rods 13 are disposed inside the T-joint groove blocks 604 of the stiffening connectors 6 of the adjacent pipe piles 1, and T-joints consistent with the sliding grooves 606 inside the T-joint groove blocks 604 are disposed at both ends of the T-joint connecting rods 13.

S4, mounting a platform corner pipe pile conversion head 3 and a corner post connector 5: referring to fig. 30 and 31, S4.1, installing a pipe pile conversion head 3 at the top of the pipe pile 1, and passing the stiffening reinforcement cage 201 through the conversion bottom plate 303 at the bottom of the pipe pile conversion head 3 and out of the main reinforcement perforation 306 of the connecting slot 305; s4.2, pressing the tubular pile conversion head 3 to press the tubular pile conversion head with the top of the tubular pile 1, and installing a main reinforcement fixing nut 1404 at a thread 205 at the upper end part of the stiffening reinforcement cage 201; s4.3, pouring sealing mortar 4 in the connecting groove 305 to protect the stiffening reinforcement cage 201 and the main reinforcement fixing nuts 1404, wherein the top surface of the sealing mortar 4 is flush with the conversion top plate 301; referring to fig. 32 again, S4.4, a corner post connector 5 is mounted on the upper portion of the pipe pile conversion head 3 by a splicing fixing screw 1201, and is tightly attached and connected by a splicing fixing nut 1401.

S5, installing the I-shaped side beam 7 once: referring to fig. 3 and 33, two symmetrical i-beams 7 are mounted on the corner post connector 5, and the i-beams 7 are fixed in the shaped groove 502 of the corner post connector 5 by screwing beam connecting screws 1202 into threaded holes 503.

S6, mounting a platform beam combined structure 8: referring to fig. 4, fig. 5 and fig. 34, S6.1, a platform combined structure a801 is suspended in a web plate of an i-beam 7, a web plate 806 at the end part of a main beam 803 of the platform combined structure a801 is tightly attached to the i-beam 7, each main beam 803 of the platform combined structure a801 is sequentially fixed by a beam connecting screw 1202, and the upper flange and the lower flange of the i-beam 7 are reinforced by a batten plate 805 and a beam connecting screw 1202; referring to fig. 25, S6.2, the clamping plate 10 on the platform assembly structure B802 is rotated toward the platform assembly structure B802 side; s6.3, lifting the platform combined structure B802 into a web plate of the symmetrical side I-shaped side beam 7, and fixing according to a fixing mode of the platform combined structure A801; referring to fig. 23, S6.4, the clamping plates 10 on the platform assembly structure B802 are rotated to the side of the platform assembly structure a801, the clamping plate holes 1503 on the clamping plates 10 are in one-to-one correspondence with the clamping plate holes 1503 on the secondary beams 804 of the platform assembly structure a801, and the platform assembly structure a801 and the platform assembly structure B802 are integrally formed by penetrating the clamping plates 10 on both sides by using the beam connecting screws 1202 and fixing the clamping plates by combining the beam fixing nuts 1402.

S7, secondary installation of the I-shaped side beam 7: referring to fig. 35, two other i-beams 7 are installed on the secondary beam 804 side of the platform beam combined structure 8, and the web plates of the i-beams 7 are tightly attached to the web plates 806 on the secondary beam 804 side; the two ends of the I-shaped side beam 7 are fixed in the square groove 502 of the corner post connector 5 by adopting splicing fixing screws 1201, then the I-shaped side beam 7 and the 8 secondary beams 804 of the platform beam combined structure are connected by adopting beam connecting screws 1202 in sequence, and finally the top and the bottom of the I-shaped side beam 7 are reinforced by adopting batten plates 805.

S8, stiffening connection of the pipe pile 1: referring to fig. 6-9, S8.1, installing a stiffening connector 6 at the bottom of the pipe pile conversion head 3 through a splicing fixing screw 1201, wherein the notch of the stiffening connector 6 with the U-shaped groove section faces to the side where the pipe pile 1 is not arranged; s8.2, the upper end and the lower end of the opening side of the U-shaped groove plate 602 of the stiffening connector 6 are respectively provided with a protection connecting plate 605; s8.3, installing T-shaped joint connecting rods 13 between adjacent tubular piles 1, wherein the T-shaped joint connecting rods 13 are respectively fixed in a chute 606 of a T-shaped connecting chute block 604 of the tubular pile 1; and S8.4, when the height of the pipe pile 1 extending out of the ground exceeds 2m, continuing to splice downwards by adopting the stiffening connector 6, and connecting by adopting the T-shaped connector connecting rod 13.

S9, tower crane installation and construction: as shown in fig. 1 and 2, a crane is mounted on the assembled platform beam assembly structure 8, and subsequent construction is performed.

Referring to fig. 3 to 9, 23 and 28, in S4 to S8, the splicing fixing screw 1201 is matched with the splicing fixing nut 1401, the beam connecting screw 1202 is matched with the beam fixing nut 1402, and the clamp connecting screw 1203 is matched with the clamp fixing nut 1403.

The above embodiments are only for illustrating the technical concept of the present invention, not for limiting the protection of the claims, and all the insubstantial modifications of the present invention using the concept shall fall within the protection scope of the present invention.

Claims (9)

1. The construction method of the deep foundation pit core-added pile supporting combined steel structure tower crane foundation is characterized by comprising the following steps of:

s1, constructing a tubular pile (1): paying off four corners of a tower crane foundation according to construction requirements, and respectively inserting the tubular piles (1) into the tower crane foundation;

s2, construction of a stiffening core (2):

s2.1, manufacturing a stiffening reinforcement cage (201) with a supporting plate (202) at the bottom, arranging a thread (205) at the upper end part of the stiffening reinforcement cage (201), and installing an annular sealing ring (203) around the supporting plate (201);

s2.2, placing the stiffening reinforcement cage (201) in the tubular pile (1), adjusting the position of the stiffening reinforcement cage (201) according to a construction drawing, and enabling the top of the stiffening reinforcement cage (201) to be 5cm higher than the top of the tubular pile (1);

s2.3, fixing the top of the stiffening reinforcement cage (201) by adopting a temporary support, pouring concrete (204) in the space of the tubular pile (1) above the supporting plate (202) to form a stiffening core (2), and removing the temporary support after reaching the strength;

s3, machining a foundation component of the combined steel structure tower crane: the special tubular pile conversion head (3), the corner post connector (5), the stiffening connector (6), the I-shaped side beam (7), the platform beam combined structure (8), the rotating structure (9), the clamping plate (10) and the T-shaped connector connecting rod (13) are processed according to the size;

s4, mounting a platform corner pipe pile conversion head (3) and a corner post connector (5):

s4.1, respectively installing tubular pile conversion heads (3) at the tops of the tubular piles (1), enabling stiffening reinforcement cages (201) to penetrate through a conversion bottom plate (303) at the bottoms of the tubular pile conversion heads (3) and penetrate out of main reinforcement perforation holes (306) of the connecting grooves (305);

s4.2, pressing the tubular pile conversion head (3) to press the tubular pile conversion head with the top of the tubular pile (1), and installing a main reinforcement fixing nut (1404) at a thread (205) at the upper end part of the stiffening reinforcement cage (201);

s4.3, pouring sealing mortar (4) in the connecting groove (305) to protect the stiffening reinforcement cage (201) and the main reinforcement fixing nut (1404), wherein the top surface of the sealing mortar (4) is level with the conversion top plate (301);

s4.4, installing a corner post connector (5) on the upper part of the pipe pile conversion head (3) through a splicing fixing screw (1201), and tightly attaching and connecting the corner post connector through a splicing fixing nut (1401);

s5, installing the I-shaped side beam (7) at one time: two symmetrical I-shaped side beams (7) are arranged on the corner post connector (5), and a beam connecting screw rod (1202) is adopted to screw into a threaded hole (503), so that the I-shaped side beams (7) are fixed in the I-shaped groove (502) of the corner post connector (5);

s6, mounting a platform beam combined structure (8):

s6.1, a platform combined structure A (801) is hung in a web plate of an I-shaped side beam (7), a web plate end plate (806) at the end part of a main beam (803) of the platform combined structure A (801) is tightly attached to the I-shaped side beam (7), each main beam (803) of the platform combined structure A (801) is sequentially fixed by a beam connecting screw (1202), and the upper flange and the lower flange of the I-shaped side beam (7) are reinforced by a batten plate (805) and the beam connecting screw (1202);

s6.2, rotating the clamping plate (10) on the platform combined structure B (802) towards the side of the platform combined structure B (802);

s6.3, hanging the platform combined structure B (802) into a web plate of the symmetrical side I-shaped side beam (7), and fixing according to a fixing mode of the platform combined structure A (801);

s6.4, rotating a clamping plate (10) on a platform combined structure B (802) to the side of a platform combined structure A (801), wherein clamping plate holes (1503) on the clamping plate (10) are in one-to-one correspondence with clamping plate holes (1503) on secondary beams (804) of the platform combined structure A (801), and a beam connecting screw (1202) penetrates through the clamping plates (10) on two sides and is fixed by combining beam fixing nuts (1402), so that the platform combined structure A (801) and the platform combined structure B (802) form a whole;

s7, secondarily installing the I-shaped side beam (7): installing two other I-shaped side beams (7) on the side of a secondary beam (804) of the platform beam combined structure (8), wherein the web plate of the I-shaped side beams (7) is tightly attached to a web plate (806) on the side of the secondary beam (804); two ends of the I-shaped side beam (7) are fixed in the square groove (502) of the corner post connector (5) by adopting splicing fixing screws (1201), then the I-shaped side beam (7) and the secondary beam (804) of the platform beam combined structure (8) are connected by adopting beam connecting screws (1202) in sequence, and finally the top and the bottom of the I-shaped side beam (7) are reinforced by adopting lacing plates (805);

s8, stiffening connection of the pipe pile (1):

s8.1, installing a stiffening connector (6) at the bottom of the pipe pile conversion head (3) through a splicing fixing screw (1201), wherein the notch of the stiffening connector (6) with the U-shaped groove section faces to the side where the pipe pile (1) is not arranged;

s8.2, the upper end and the lower end of the U-shaped groove plate (602) of the stiffening connector (6) are respectively provided with a protection connecting plate (605);

s8.3, installing T-shaped joint connecting rods (13) between adjacent tubular piles (1), wherein the T-shaped joint connecting rods (13) are respectively fixed in a T-shaped connecting groove block (604) sliding groove (606) of the tubular piles (1);

s8.4, when the height of the pipe pile (1) extending out of the ground exceeds 2m, adopting a stiffening connector (6) to splice downwards continuously, and adopting a T-shaped connector connecting rod (13) to connect;

s9, tower crane installation and construction: and installing a crane on the assembled platform beam combined structure (8), and carrying out subsequent construction.

2. The construction method of the deep foundation pit core-added pile supporting combined type steel structure tower crane foundation is characterized in that in the S2, the top of a stiffening reinforcement cage (201) is higher than the bottom of a connecting groove (305) and lower than the top of the connecting groove (305).

3. The construction method of the deep foundation pit core-added pile supporting combined type steel structure tower crane foundation is characterized in that in the S3, a pipe pile conversion head (3) comprises a conversion top plate (301), a connection barrel body (302) and a conversion bottom plate (303), a circular connection groove (305) is formed in the center of the top of the conversion top plate (301), a penetrating main reinforcement perforation (306) is formed in the connection groove (305), the position of the main reinforcement perforation (306) is matched with that of a stiffening reinforcement cage (201), vertical stiffening rib plates (304) are arranged between the conversion top plate (301) and the conversion bottom plate (303) in the circumferential direction of the connection barrel body (302), and splicing fixing holes (1501) are formed between the stiffening rib plates (304).

4. The construction method of the deep foundation pit core-added pile supporting combined type steel structure tower crane foundation is characterized in that in the S3, a corner post connector (5) comprises a bottom flange end plate (501) and an upper steel structure block (504), the upper steel structure block (504) is provided with an edge beam type groove (502) in the center of four sides, and a threaded hole (503) is formed in the top of the type groove (502).

5. The construction method of the deep foundation pit core-added pile supporting combined type steel structure tower crane foundation is characterized in that in the S3, a stiffening connector (6) comprises a U-shaped groove plate (602) and connecting end plates (601) at the upper end and the lower end, splicing fixing holes (1501) consistent with the pipe pile conversion head (3) are formed in the connecting end plates (601), and triangular stiffening plates (603) are arranged at connecting positions of the U-shaped groove plate (602) and the connecting end plates (601) at intervals; the three sides of the U-shaped groove plate (602) are provided with T-shaped connecting groove blocks (604), and the distance between the upper end and the lower end of each T-shaped connecting groove block (604) and the connecting end plate (601) is more than 10cm, so that an installation space is provided for the T-shaped connector connecting rod (13).

6. The construction method of the deep foundation pit core-added pile supporting combined type steel structure tower crane foundation is characterized in that in the S3, a platform beam combined structure (8) consists of a platform combined structure A (801) and a platform combined structure B (802), and the platform combined structure A and the platform combined structure B are formed by welding a main beam (803) and a short secondary beam (804), wherein the platform combined structure B (802) is provided with clamping plates (10) with rotating structures (9) on two sides of a web plate (806) at the end of the main beam (803) at the splicing end, and clamping plate holes (1503) are formed in the clamping plates (10); the rotating structure (9) consists of a rotating shaft (901) and a rotating shell (902), the rotating shell (902) is welded on a web plate of the main beam (803), the rotating shaft (901) is arranged in the rotating shell (902), and the rotating shaft (901) can rotate relative to the rotating shell (902); the platform combined structure A (801) is provided with a clamping plate hole (1503) matched with the clamping plate (10) at the splicing end of the main beam (803); the connecting end of the main beam (803) is provided with an extension web (807) which is half of the width of the flange of the I-shaped side beam (7) at the connecting end of the main beam (803), and a web end plate (806) which is the same as the web of the I-shaped side beam (7) in height is arranged at the end part of the extension web (807), so that the connecting end of the main beam (803) penetrates into the web of the I-shaped side beam (7) and is completely attached; the secondary beams (804) are arranged between the main beams (803), welding seams (11) are arranged at the joints of the secondary beams (804) and the main beams (803) to connect the main beams into a whole, and an extension web (807) and a web end plate (806) which are connected with the beams of the I-shaped side beams (7) are arranged at the joints of the secondary beams (804) and the I-shaped side beams (7).

7. The construction method of the deep foundation pit core-added pile supporting combined type steel structure tower crane foundation is characterized in that in the S3, an I-shaped side beam (7) is I-shaped steel, the size of the I-shaped steel is consistent with that of an angle post connector (5) I-shaped groove (502), the connection parts of the I-shaped side beam (7) and a main beam (803) and a secondary beam (804) of a platform beam combined structure (8) are respectively provided with beam connection holes (1502) on a web plate and an upper flange and a lower flange, and the section size of the I-shaped side beam (7) is consistent with that of the main beam (803) and the secondary beam (804).

8. The construction method of the deep foundation pit core-added pile supporting combined type steel structure tower crane foundation is characterized in that in the S3, T-shaped joint connecting rods (13) are arranged inside T-shaped connecting groove blocks (604) of stiffening connectors (6) of adjacent tubular piles (1), and T-shaped joints consistent with inner sliding grooves (606) of the T-shaped connecting groove blocks (604) are arranged at two ends of each T-shaped joint connecting rod (13).

9. The construction method of the deep foundation pit core-added pile supporting combined type steel structure tower crane foundation is characterized in that in S4-S8, a splicing fixing screw (1201) is matched with a splicing fixing nut (1401), a beam connecting screw (1202) is matched with a beam fixing nut (1402), and a clamping plate connecting screw (1203) is matched with a clamping plate fixing nut (1403).

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