Frame structure construction method for high-water-level soft soil foundation

Abstract

The invention belongs to the technical field of constructional engineering, and particularly relates to a frame structure construction method for a high-water-level soft soil foundation, which comprises the following steps of: 1, acquiring a deepening topographic map of the high-water-level foundation; 2, the ground is laid according to the deepened topographic map, and a building layer is formed; 3, determining the position of a tower crane and the position of a frame structure according to the deepened topographic map; 4, a foundation pit of the tower crane and the frame structure is built, and a tower foundation of the tower crane and the frame structure is poured in the foundation pit; and 5, tower cranes are built step by step, and a frame structure adjacent to the rock mass is built through the tower cranes. The deepening topographic map is generated for the construction site, targeted laying according to different geologies is facilitated, the building layer is laid on the construction site, rainwater can rapidly run off, meanwhile, the bearing capacity of the construction site is improved, and the problems of sedimentation and inclination in the installation process of the frame structure and the tower crane are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and particularly relates to a construction method for a frame structure on a high water table soft soil foundation. Background Art

[0002] Due to the influence of climate in some areas, the precipitation is large, resulting in the soil being of a high water table soft soil type structure. When the construction site is in a special geological condition of a high water table soft soil foundation and adjacent to a rock wall, the conventional construction methods for high frame structures face many problems. The soft soil foundation has low bearing capacity, and the high water table will further reduce the soil strength, increasing the risk of foundation settlement and inclination of the high frame structure; being adjacent to the rock wall limits the layout space of the high frame structure foundation, and the influence of the rock wall on the high frame structure needs to be considered during the construction process.

[0003] Currently, there are many construction methods for high frame structures under ordinary geological conditions, but there are few construction methods specifically applicable to the complex working conditions of a high water table soft soil foundation adjacent to a rock wall. Some conventional methods cannot effectively ensure the stability and safety of high frame structures under such special conditions, and are prone to serious accidents such as the sinking of tower crane foundations, the inclination or even collapse of the tower body, affecting the construction progress and project quality, and at the same time bringing huge potential safety hazards. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction method for a frame structure on a high water table soft soil foundation to solve the technical problem that frame construction cannot be carried out in the case of being adjacent to a rock wall and having a high water table soft soil foundation in traditional construction.

[0005] To solve the above technical problems, the specific technical solution of the present invention is as follows:

[0006] In some embodiments of the present application, a construction method for a frame structure on a high water table soft soil foundation is provided, including the following steps:

[0007] Step 1: Obtain a detailed topographic map of the high water table foundation;

[0008] Step 2: Perform paving treatment on the ground according to the detailed topographic map to form a building layer;

[0009] Step 3: Determine the positions of the tower crane and the frame structure according to the detailed topographic map;

[0010] Step 4: Construct the foundation pits for the tower crane and the frame structure, and pour the tower bases of the tower crane and the frame structure in the foundation pits;

[0011] Step 5: Gradually erect the tower crane, and erect the frame structure adjacent to the rock mass through the tower crane.

[0012] In some embodiments of the present application, obtaining the deepened topographic map of the high water level foundation in step 1 includes the steps of: obtaining the bearing capacity of each underground soil layer; obtaining the height of the underground water level and analyzing the reasons for geological water content.

[0013] In some embodiments of the present application, the building layers in step 2 from top to bottom are successively: Quaternary artificial fill layer, Quaternary upper Pleistocene alluvial layer, and Permian lower Permian Maokou Formation bedrock.

[0014] In some embodiments of the present application, the tower crane erection method in step 5 includes:

[0015] Step 5.1.1: Install vertical reinforcement bars inside the tower base of the preset tower crane, and build the foundation section through anchor bolts.

[0016] Step 5.1.2: Install the standard section on top of the foundation section, and at the same time install the climbing frame on the standard section, and install the slewing assembly on top of the standard section.

[0017] Step 5.1.3: Correct the verticality of the standard section.

[0018] Step 5.1.4: Install the tower head assembly, counter jib assembly, and boom assembly on the slewing assembly.

[0019] Step 5.1.5: Install the hoisting component at the end of the counter jib assembly.

[0020] Step 5.1.6: Install a number of tie rods between the tower head, counter jib assembly, and boom assembly to form a triangular structure.

[0021] Step 5.7: After the tower crane is installed, prepare for trial operation, and conduct no-load tests and load tests.

[0022] In some embodiments of the present application, when building a frame structure with a height exceeding that of the tower crane, remove the tower head and increase the length of the standard section, and the disassembly method of the tower crane is opposite to the installation method.

[0023] In some embodiments of the present application, the verticality correction in step 5.1.3 is achieved by opening a first connection point, a second connection point, and a third connection point on the standard section, and opening a first pin hole and a second pin hole on the corresponding attachment wall. Horizontally lift two attachment rods respectively by a crane, connect one end of the attachment rod to the first pin hole, and connect the other ends of the two attachment rods to the first connection point and the second connection point respectively through adjustable screw rods to form a triangular structure; horizontally lift two attachment rods respectively by a crane, connect one end of the attachment rod to the second pin hole, and connect the other ends of the two attachment rods to the second connection point and the third connection point respectively through adjustable screw rods to form a triangular structure; adjust the verticality of the standard section by adjusting the length of the adjustable screw rod. During this process, detect the verticality of the standard section in two different directions through a theodolite.

[0024] In some embodiments of the present application, the method for building the frame structure in step 5 is as follows:

[0025] Step 5.2.1: Use the tower crane after erection to gradually build the elevator shaft frame of the first height on the tower foundation of the frame structure;

[0026] Step 5.2.2: Install the first support on the elevator shaft frame of the first height, so that one end of the first support is connected to the elevator shaft frame of the first height, and the other end is connected to the attachment wall;

[0027] Step 5.2.3: Gradually erect the first-height curved columns and ring beams between the elevator shaft frame of the first height and the ground. One end of the first-height curved column is connected to the ground, and the other end arcs upward. One end of the first-height ring beam is connected to the elevator shaft frame, and the other end is connected to the curved column, so that the height of the first-height curved columns and ring beams is flush with the elevator shaft frame of the first height;

[0028] Step 5.2.4: Gradually build the elevator shaft frame of the second height on the elevator shaft frame of the first height;

[0029] Step 5.2.5: Install the second support on the elevator shaft frame of the second height, so that one end of the second support is connected to the elevator shaft frame of the second height, and the other end is connected to the attachment wall. The second support corresponds to the position of the first support and is in a parallel state;

[0030] Step 5.2.6: Gradually build the second-height curved columns and ring beams on the first-height curved columns and ring beams, so that the second-height curved columns and ring beams are flush with the elevator shaft frame of the second height. One end of the second-height curved column is connected to the end of the first-height curved column, and the other end arcs upward. One end of the second-height ring beam is connected to the curved column, and the other end is connected to the elevator shaft frame of the second height;

[0031] Step 5.2.7: Build the elevator shaft frame of the third height on the top of the elevator shaft frame of the second height, and install a support platform on the elevator shaft frame of the third height;

[0032] Step 5.2.8: Build the third-height curved columns and ring beams between the support platform and the second-height curved columns and ring beams, so that one end of the third-height curved column is connected to the second-height curved column, and the other end is connected to the support platform;

[0033] Step 5.2.9: Install the third support on the support platform, and make the third support correspond to the position of the second support and be arranged in parallel. One end of the third support is connected to the support platform, and the other end is connected to the attachment wall;

[0034] Step 5.2.10: Erect the fourth support between the second support and the third support, connect one end of the fourth support to the second support and the other end to the third support. The fourth support is perpendicularly arranged with respect to the second support and the third support respectively. After the framework structure is built, remove the fourth support.

[0035] Step 5.2.11: Install corresponding equipment on the framework structure according to actual requirements.

[0036] In some embodiments of the present application, during the construction process of the framework structure, during the construction of each section of the elevator shaft frame, curved column, ring beam, first support, second support, third support, fourth support and support platform, construction checking calculations need to be carried out.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows. The present invention generates a detailed topographic map of the construction site, which is convenient for targeted laying according to different geological conditions. By laying a building layer on the construction site, rainwater can drain quickly, and at the same time, the bearing capacity of the construction site is improved, avoiding problems such as settlement and inclination during the installation of the framework structure and tower crane. By adopting corresponding construction methods for the framework structure and tower crane, not only the stability and safety of the construction process are improved, but also the influence of the rock wall on the framework structure does not need to be considered. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0039] Figure 1 is a schematic diagram of the framework structure installation provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of the tower crane installation provided by an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of the grounding machine structure provided by an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of the foundation pit structure provided by an embodiment of the present invention;

[0043] Figure 5 is a schematic diagram of the foundation pit structure provided by an embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of the structure of the climbing frame provided by an embodiment of the present invention;

[0045] Figure 7Schematic structural diagram of the slewing assembly provided by the embodiment of the present invention;

[0046] Figure 8 Schematic structural diagram of the tower cap provided by the embodiment of the present invention;

[0047] Figure 9 Installation schematic diagram of the attachment rod provided by the embodiment of the present invention;

[0048] Figure 10 Installation schematic diagram of the boom provided by the embodiment of the present invention;

[0049] Figure 11 Installation schematic diagram of the hanging rope at the lifting point provided by the embodiment of the present invention;

[0050] Figure 12 Installation schematic diagram of the wire rope winding of the jib provided by the embodiment of the present invention. Detailed implementation manners

[0051] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0052] In order to better understand the purpose, structure and function of the present invention, the following combines the drawings to further describe the present invention in detail.

[0053] Refer to the attached Figures 1-12 As shown, in the embodiment of the present application, it includes the following steps:

[0054] Step 1: Obtain the deepened topographic map of the high water level foundation; specifically, obtaining the deepened topographic map of the high water level soft soil foundation includes obtaining the water content, void ratio, permeability, bearing capacity and shear strength in the soft soil, and marking the soft soil information on the deepened topographic map. Obtaining the deepened topographic map of the high water level soft soil foundation at least includes recording the data of the soft soil foundation through topographic surveying, and establishing the deepened topographic map according to the data recorded in the geological exploration report through a computer software model based on the surveying data.

[0055] Step 2: Carry out paving treatment on the ground according to the deepened topographic map to form a building layer; specifically, re-pave the ground in the construction site to form the corresponding stratum. It should be noted that a site with geology meeting the building layer standard is preferably used;

[0056] The building layer is respectively composed of: artificial fill layer (Q4ml), Quaternary upper Pleistocene alluvial layer (Q3al) and underlying Permian lower Maokou formation bedrock (P1m). According to the rock and soil structure and engineering geological characteristics of the rock and soil layer, it can be divided into: ① miscellaneous fill, ② silty clay, ③ moderately weathered limestone from top to bottom. The characteristics of each rock and soil layer are described below respectively:

[0057] (1) Quaternary artificial fill soil (Q4ml)

[0058] Plain fill: Yellowish-brown, loose soil-like, mainly composed of silty clay and a small amount of crushed stone and humus, which is recent artificial backfill soil. Without compaction treatment, it has a loose structure and poor uniformity. This layer is distributed in most parts of the whole site, with the exposed layer thickness of 0.50 - 22.30 m, the average thickness of 6.02 m, the elevation of the layer top of 67.72 - 150.03 m, and the elevation of the layer bottom of 62.02 - 134.73 m.

[0059] (2) Upper Pleistocene alluvial layer of Quaternary (Q3al)

[0060] Silty clay: Partially distributed in the whole site, and this layer is exposed in 70 boreholes. Yellowish-brown, hard plastic, mainly composed of clay particles and secondly silt particles. High toughness, high dry strength, smooth cut surface, no shaking reaction, and relatively uniform soil quality. The average compression coefficient is 0.20 MPa-1, and the average compression modulus is 8.84 MPa. The measured standard penetration blow count is 15 - 18 blows, and the corrected standard value is 14.16 blows. The exposed layer thickness is 1.10 - 17.00 m, the average thickness is 6.47 m, the elevation of the layer top is 63.92 - 108.09 m, the elevation of the layer bottom is 49.67 - 103.53 m, and the buried depth of the layer top is 1.00 m - 22.30 m.

[0061] (3) Bedrock of the Lower Permian Maokou Formation (P1m)

[0062] Medium weathered limestone: Distributed throughout the whole site. Grayish-white to grayish-black, cryptocrystalline structure, medium-thick bedded structure, slightly developed rock joints and fissures, occasionally filled with calcite veins in the gaps, distributed in a dendritic pattern, most of the rock cores are short columnar, columnar, and a small amount are long columnar and massive, the joint length is 5 - 35 cm, the longer ones reach 40 - 55 cm, the block diameter is 5 - 15 cm, and the recovery rate RQD = 85. The hammering sound is clear, the rock is hard and the strength is relatively hard rock, and the basic rock mass quality grade is Ⅳ. The standard value of the uniaxial compressive saturated strength is 33.50 Mpa. No adverse geological phenomena such as free face, fracture zone, cave and soft interlayer are found within the scope of this exploration depth. The exposed layer thickness is 5.00 - 16.00 m, the average layer thickness is 10.33 m, the buried depth of the layer top is 0.00 - 29.20 m, and the elevation of the layer top is 49.67 - 293.64 m.

[0063] Step 3: Determine the position of tower crane 2 and the position of frame structure 1 according to the deepened topographic map, and calculate the materials and equipment required for tower crane 2 and frame structure 1;

[0064] Specifically, in combination with the deepened topographic map, according to the bearing capacity of each soil layer and the geological requirements during the construction of frame structure 1 and tower crane 2, the position division is carried out.

[0065] Step 4: Construct a foundation pit 3 for the tower crane 2 and the frame structure 1, and cast the tower base of the tower crane 2 and the frame structure 1 in the foundation pit 3. Specifically, during the excavation of the foundation pit 3, the walls of the foundation pit 3 need to be waterproofed, and the tower base also needs to be waterproofed. During the casting of the tower base, parallel vertical reinforcement 301 should be pre-arranged in the foundation pit 3 to facilitate the subsequent installation of the tower crane 2 and the frame structure 1.

[0066] Step 5: Build the tower crane 2 step by step, and use the tower crane 2 to build the frame structure 1 close to the rock mass.

[0067] The tower crane 2 construction method includes:

[0068] Step 5.1.1: Install the vertical reinforcement 301 inside the tower base of the preset tower crane 2, and build the foundation section 201 through the anchor bolts 302. In other words, 100mm thick C15 concrete is used in the tower base of tower crane 2, and the cushion layer exceeds 100mm on each side of the tower crane 2 foundation. The foundation uses 1350mm thick C35 concrete, and pre-embedded steel bars are all around the foundation. The pre-embedded position, specifications and spacing are the same as the raft reinforcement at this location, and the anchor length meets the requirements. Prepare the pre-embedded bolts according to the foundation requirements. When pouring the concrete foundation, place the pre-embedded bolts into the foundation and fix them. Construct according to the instructions of tower crane 2. Before pouring concrete, it is necessary to calibrate the verticality of the center line and the horizontal plane. After pouring concrete, the verticality of the center line of foundation section 201 and the horizontal plane is not greater than 1.5 / 1000. Refer to the anchor bolts 302 Figure 5 Make arrangements.

[0069] The lower flange of the main chord of foundation section 201 is connected to the anchor bolts 302. The upper ends of each main chord have three connecting sleeves, which connect to the standard section 202. Use a crane to lift foundation section 201 and slowly place it on the foundation. Pass the anchor bolts 302 through the bolt holes in the lower flange and secure them with the matching nut assembly, using a preload torque of 1600 N·m. When erecting the tower, only one foundation section 201 and two standard sections 202 are hoisted. The remaining standard sections 202 are added by jacking until the desired tower height is reached.

[0070] Note: The orientation of the base section 201 directly determines the direction of the steps of the standard section 202. Therefore, the need for lifting and lowering the tower crane must be considered when placing the base section 201. When lifting the tower section, it is strictly forbidden to hang the rigging on the horizontal diagonal brace.

[0071] Step 5.1.2: Install the standard section 202 on top of the base section 201. At the same time, install the climbing frame 203 on the standard section 202, and install the slewing assembly 204 on top of the standard section 202. Specifically, connect the standard section 202 with M30×360-10.9 grade high-strength bolt assemblies through equipment such as a crane, hoist it onto the base section 201, and connect it with M30×360-10.9 grade high-strength bolt assemblies. Each high-strength bolt should be screwed into two nuts and tightened to prevent loosening, and the pre-tightening torque should reach 1500 N·m.

[0072] The climbing frame 203 is mainly composed of the steel structure of the climbing frame 203, the platform, the hydraulic jacking device, the standard section 202 introduction device, etc. The installation process of the climbing frame 203 is as follows

[0073] (1) After assembling the climbing frame 203, hang the lifting tool on the climbing frame 203 and tighten it. Lift it with a steel wire rope. Remember that the position where the jacking oil cylinder is installed must be on the same side as the tower body steps.

[0074] (2) Slowly sleeved the climbing frame 203 on the outside of the tower body section.

[0075] (3) Place the climbing claws on the climbing frame 203 on the steps at the upper part of the base section 201①, and then adjust the gap between the 16 climbing guide wheels and the standard section 202 (the gap is preferably 2-3 mm)

[0076] (4) Slowly lift the climbing frame 203 to the outside of the standard section 20

[0077] Note: The jacking oil cylinder and the tower body steps are on the same side.

[0078] (5) Place the step-changing ejector rod on the climbing frame 203 on the fourth pair of steps from bottom to top, and then adjust the gap between the 16 climbing guide wheels and the standard section 202 (the gap is 2-3 mm).

[0079] (6) Install the jacking oil cylinder, hoist the hydraulic pump station to a corner of the platform, connect the oil pipes, and check the operation of the hydraulic system. It should be ensured that the rotation direction of the fan blade of the oil pump motor is consistent with the arrow mark on the shell to avoid burning out the oil pump. If there is an error, the motor wiring should be reconnected.

[0080] Step 5.1.3: Calibrate the verticality of the standard section 202. Specifically, check its verticality with a theodolite or the wire-hanging method. The verticality error of the four sides of the main chord should not be greater than 1.5 / 1000;

[0081] Step 5.1.4: Install the tower cap assembly 205, balance arm assembly 206, and boom assembly 209 on the slewing assembly 204. The slewing assembly 204 consists of an upper support, a lower support, a slewing bearing, a slewing mechanism, and a slewing limiter. Connect the lower support, slewing bearing, and upper support with 80 10.9-grade M24 high-strength bolts. The preload torque for each bolt should be 6400 N·m. Double nuts should be used to prevent loosening. Install railings on the slewing assembly 204 to form a platform structure, and then construct the driver's cab on the platform.

[0082] The tower cap assembly 205 consists of a tower top structure, a rotating tower body, a tower top platform, a lower platform, a ladder, a torque limiter, and a lifting capacity limiter. The assembly method of the tower cap assembly 205 is as follows:

[0083] 1) Install the platform, railings and ladder (see the atlas for details).

[0084] 2) Install the torque limiter and lifting capacity limiter.

[0085] ① Torque limiter: Use the hexagonal head bolt provided with the limiter to fasten the lower end of the torque limit ring (the end with the cable connector) to the lower fixing block. Connect the pull rod to the upper end of the torque limit ring and lock it to the upper fixing block with a hexagonal nut.

[0086] ② Lifting weight limiter: Use A25 pin to install the weight limiter on the ear seat of the slewing tower body, insert the cotter pin 5×63 into the pin hole, and open the two legs of the cotter pin 15°~30°.

[0087] 3) To facilitate the installation of the balance arm, a balance arm pull rod I must be installed on each of the left and right sides of the rear side of the tower top.

[0088] 4) Hoisting process

[0089] ①Hang the lifting device on the lifting lug of the tower cap. Lift the tower cap and slowly lower it to the upper support. Make sure the vertical side of the tower cap is aligned with the direction of the crane arm.

[0090] ② Use 4 A60 pins, 8 20A positioning pins and 16 cotter pins to connect the tower cap to the upper support.

[0091] The balance arm assembly 206 includes balance arm I, balance arm II, platform, handrail, lifting mechanism, power cabinet, brake resistor box and part of the balance arm pull rod. The assembly structure of the balance arm is as follows:

[0092] 1) Use four A45 pins and cotter pins to connect balance arm I and balance arm II.

[0093] 2) Use A20 pins and cotter pins to assemble the left and right platforms.

[0094] 3) Fix the power cabinet, resistor box and hoisting mechanism on the counter jib.

[0095] 4) Insert the railing into the counter jib connection sleeve and fix it with a split pin. Connect the railings firmly with pipe clips.

[0096] 5) Assemble the remaining two pairs of counter jib tie rods II and III (a total of four) with A45 pin shafts, and then install them on the counter jib II diagonal stay plate with A45 pin shafts.

[0097] The installation process of hoisting the counter jib assembly 206 is as follows:

[0098] 1) Connect the slewing mechanism to the temporary power supply and slewing the part above the slewing bearing to the direction convenient for installing the counter jib.

[0099] 2) Select the lifting points 2 and 4, and lift the counter jib assembly 206. Connect the counter jib and the slewing tower with A50 pin shafts.

[0100] 3) Gradually raise the tail of the counter jib, and connect the tie rod on the counter jib and the tie rod on the tower cap with A45 pin shafts and split pins.

[0101] 4) Slowly lower the counter jib to make the tie rods in a tensioned state. Then hoist two 2.66t counterweight blocks.

[0102] 5) Note:

[0103] ① The installation order of the counterweight blocks must be from near (the tower body) to far (the tower body).

[0104] ② The stop block of the installation pin must be close to the counterweight block;

[0105] ③ The installation pin must exceed the triangular cushion block for installing the counterweight on the counter jib.

[0106] The boom assembly 209 includes a boom, boom tie rods, a load trolley and a luffing mechanism.

[0107] The assembly process of the boom assembly 209 is as follows:

[0108] 1) Assemble the boom on the flat sleepers (or brackets, about 0.6m high) near the tower crane.

[0109] 2) Fasten the maintenance basket on the load trolley and make the load trolley as close as possible to the minimum amplitude at the root of the boom.

[0110] 3) After assembling the boom tie rods, hinge its lower connecting plate with the lifting point on the boom with A55 pin shafts, insert the split pins, and place it in the positioning bracket on the upper chord of the boom.

[0111] 4) Two luffing steel ropes (A8) are wound out from the luffing mechanism drum installed at the root of the boom. One of them passes through the boom root guide pulley and is fixed to the installation pin with 3 wire clips through the rope passing hole at the rear of the luffing trolley; the other passes through the boom middle and head guide pulleys and is fixed to the ratchet (tensioning device) through the rope passing hole at the front of the trolley. If the steel rope is slack, remove the locking pin and turn the ratchet to tension the steel rope. After adjustment, the locking pin needs to be reinstalled.

[0112] Note:

[0113] ① Three safety ropes must be left on the drum for the luffing steel rope, and one isolation rope must be left on the drum.

[0114] ② When changing the boom length, the redundant luffing steel rope needs to be bundled and fixed to the trolley.

[0115] The installation process of the hoisting boom assembly 209 is as follows:

[0116] 1) Use the temporary power supply of the slewing mechanism to slewing the upper structure of the tower crane to the position convenient for installing the boom

[0117] 2) Hang the ropes, and the hoisting center of gravity is shown in Figure 11 Check whether the trial hoisting is balanced. Otherwise, the hanging rope position can be appropriately moved, and hoist the boom assembly 209 to the installation height. Connect and fix the slewing tower and the boom root with a pin shaft. Figure 11 Note: When hoisting the boom, the hoisting point position should be recorded and marked for use when disassembling the tower.

[0118] 3) Connect and fix the slewing tower and the boom root with A50×148 pin shaft and split pin.

[0119] 4) Connect the power supply of the hoisting mechanism, let out the hoisting steel rope and wind it well. While gradually raising the boom tip with a truck crane, start the hoisting mechanism to retract the hoisting steel rope until the boom tie rod is close to the top tower plate. Hinge the long and short tie rods to the top tower plate with pin shafts respectively, and insert split pins. Slack the hoisting mechanism steel rope, lower the crane hook to slowly lower the boom, and the tie rod is stressed.

[0120] Note:

[0121] ① Before installing the boom assembly 209, the user should arrange personnel to connect the control circuits of the hoisting mechanism and the slewing mechanism. When installing the boom assembly 209, the tower crane must be able to slewing and hoist normally.

[0122] ② When hoisting the boom tie rod, the steel rope end is fixed to the tie rod fixing ear with a φ30 pin shaft and split pin through a wire clip and a wedge sleeve.

[0123]

[0124] ​Install the remaining counterweights

[0125] Lift and install the remaining counterweight blocks according to the length of the installed boom.

[0126] Step 5.1.5: Install the lifting component 208 at the end of the counterweight boom assembly 206;

[0127] Specifically, the installation process of the hoisting wire rope is as follows:

[0128] (1) After the installation of the counterweight hoisting is completed, wind the hoisting wire rope 207.

[0129] (2) The hoisting wire rope 210 is released from the hoisting mechanism drum, passes downward through the tower top guide pulley and then through the load limiter pulley, winds forward around the load trolley and the hook pulley block, and finally the rope end is fixed to the anti-twist device at the head of the boom through a rope clip and a wedge sleeve with a pin.

[0130] Note: The hoisting wire rope 210 must pass through the wedge sleeve as specified, and reverse winding is strictly prohibited.

[0131] (3) The rope clips must be used as specified:

[0132] 1) The distance A between the rope clips should be equal to 6 - 7 times the diameter of the wire rope. The rope clip closest to the thimble should be as close to the thimble as possible, but still ensure the correct tightening of the rope clip without damaging the outer wires of the wire rope.

[0133] 2) The saddle should be buckled on the working section of the wire rope, and the U-bolt should be buckled on the tail section of the wire rope, and they should not be arranged alternately.

[0134] 3) Do not arbitrarily reduce the number of rope clips (3).

[0135] 4) When tightening the rope clips, the reasonable force should be considered, and the rope clip farthest from the thimble should not be tightened first alone.

[0136] 5) In actual use, the rope clips should be inspected after being loaded one or two times. In most cases, the nuts need to be tightened further.

[0137] The safety rope must be fixed to the ear plates at both ends of the boom head and tail, and locked with two rope clips respectively.

[0138] When walking on the boom for inspection or maintenance work, the safety belt must be buckled to the safety rope first to take safety protection measures.

[0139] Step 5.1.6: Install several tie rods between the tower cap, the counterweight boom assembly 206 and the boom assembly 209 to form a triangular structure;

[0140] Step 5.7: After the tower crane 2 is installed, make preparations for trial operation and conduct no-load tests and load tests.

[0141] When erecting the frame structure 1 with a height exceeding that of tower crane 2, remove the tower cap and increase the length of the standard section 202. The disassembly method of tower crane 2 is the opposite of the installation method.

[0142] It should be further noted that the verticality correction in step 5.1.3 is achieved by providing a first connection point, a second connection point, and a third connection point on the standard section 202, and providing a first pin hole and a second pin hole on the corresponding attachment wall. The crane is used to horizontally lift two attachment rods 4 respectively, so that one end of the attachment rod 4 is connected to the first pin hole, and the other ends of the two attachment rods 4 are respectively connected to the first connection point and the second connection point through adjustable screw rods to form a triangular structure; the crane is used to horizontally lift two attachment rods 4 respectively, so that one end of the attachment rod 4 is connected to the second pin hole, and the other ends of the two attachment rods 4 are respectively connected to the second connection point and the third connection point through adjustable screw rods to form a triangular structure; by adjusting the length of the adjustable screw rod, the verticality of the standard section 202 is adjusted. During this process, the verticality of the standard section 202 in two different directions is detected by a theodolite.

[0143] Specifically, the design of the tower crane attachment wall is based on the relevant content of the "1.3.2 Attached Type" chapter in the "Tower Crane Operating Manual SYT80 (T6012 - 6) Tower Crane". Among them, the maximum independent height of the tower crane is 40.5m (21 standard sections 202), and a total of 5 attachments are set at the elevations of 15m, 30m, 45m, 65m, and 87.5m of the steel structure main body.

[0144] The structure of the attachment of Tower Crane 1# to Tower 2 is a steel structure column. The connection between the attachment rod 4 and the steel column is made by using a hoop and high-strength bolts. The actual maximum horizontal distance of the attachment wall of Tower Crane 2 is 18.9m. The actual horizontal distance between the attachment points of the two tower bodies is 11.4m.

[0145] Dynamic Attachment of Tower Crane 1#

[0146]

[0147] Note:

[0148] When jacking up the attachment wall, a warning area should be set, and warning signs should be placed at prominent positions below the tower crane to inform irrelevant personnel not to walk within the operation area to prevent falling objects from causing personal injuries.

[0149] When operating, the operator must fasten the safety belt; wear a protective face mask during welding to prevent arc welding light and welding slag from hurting the eyes. The on-site safety officer should prepare a fire extinguisher and immediately extinguish it when the welding slag falls on the safety net or flammable items.

[0150] 3) Preparation work

[0151] A. The wall-attached hoop shall be fabricated according to the requirements in the attached wall plan diagram, and during installation, it must also be embedded strictly at the positions shown in the diagram.

[0152] B. According to the specific requirements and specific embedding positions of the embedded parts in this plan, the general contractor and the supervision unit shall inspect and accept the embedded parts and the wall-attached rods. Installation can only be carried out after passing the acceptance. Fabricate the attachment rod 4 according to the cross-sectional dimensions and lengths of the attachment rods determined by the manufacturer, combined with the actual length of the attachment rod 4 on-site (measured on-site). Before fabrication, technical disclosure shall be given to the operating personnel (welders), and the material, specifications, models, thickness, and quantity of the section steel (angle steel) shall be confirmed. After passing the inspection, fabrication can be carried out. During the fabrication process, the welding quality shall be ensured, and there shall be no phenomena such as slag inclusion, air bubbles, and burning edges in the welds. Before the wall-attached installation, safety and technical disclosure shall be given to the installation operating personnel, the responsibilities of each person shall be clarified, and the signature procedures shall be completed in accordance with relevant regulations. Fire approval shall be obtained before gas cutting and welding operations.

[0153] C. Erection of the operation platform and protective facilities

[0154] Before the installation of the wall-attached operation, the general contractor shall erect the operation platform and safety protection (the operation platform shall be erected by the general contractor according to the plan approved by the project technical person in charge). The position of the erected operation platform is generally 1.5 m below the wall-attached elevation, which is convenient for installing the attachment ring and the high-strength connecting bolts of the attachment ring. The dimensions of the operation platform for both tower cranes are 3.4 m × 3.4 m × 1.2 m (that is, 0.8 m outward along the periphery of the standard section 202, and steel gratings shall be laid. The periphery shall be connected with steel pipes to make railings and safety nets for protection. The allowable load of the operation platform shall be not less than 3 kN / m2). The operation platform and safety protection at the building embedded parts are generally made use of the external scaffold. There is no influence of the external scaffold between the embedded parts and the tower body attachment ring.

[0155] D. Preparation of gas cutting equipment and welding equipment

[0156] Place the oxygen cylinder, acetylene cylinder, gas pipes, cutting torch, electric welding machine, etc. in the hanging basket, and take measures to prevent the cylinders from rolling (blocked with wooden squares). They shall be placed evenly, and the four corners of the hanging basket shall be lifted by the tower crane 2, and the hanging basket shall be placed on the roof of the building. During use, the oxygen cylinder and acetylene cylinder shall be placed upright, and it is strictly prohibited to place them horizontally. The distance between the cylinders shall be at least 5 m. The electric welding machine shall be placed away from the cylinders.

[0157] 4) Installation of the attachment

[0158] The wire rope used for this hoisting has a diameter of 16 mm, a length of not less than 6 m, and a quantity of 2. Wire breaks or strand breaks are not allowed in the slings. Shackles with a capacity of 2 t are used, that is, the pin diameter is 20 mm, and the quantity is 2. Wear exceeding the standard or micro-cracks are not allowed in the shackles. It is known from "Practical Hardware Handbook" P1004 and "Practical Handbook for Self-propelled Crane Hoisting" P44 that the selected slings and shackles can meet the hoisting task of this time. The hoisting contact method uses walkie-talkies.

[0159] Hang the two slings in the safety hooks of Tower Crane 2. Use Tower Crane 2 to lift the pre-assembled attachment ring (half) and place it horizontally at the node position of Standard Section 202 and fix it at 3 points. Then fix it on Standard Section 202 with double-strand 10# iron wire (diameter 3.5 mm) and tighten it. Then use Tower Crane 2 to lift the other half of the pre-assembled attachment ring (ensure the lifted object is horizontal during hoisting, with two lifting points), slowly align the holes with the attachment ring previously fixed on Standard Section 202, connect them with high-strength bolts, and tighten. When operating on the working platform, the operator must fasten the safety belt. Tools and objects are strictly prohibited from being dropped to prevent falling objects from height.

[0160] 5) Installation of the wall attachment rod and correction of the tower body verticality

[0161] Use Tower Crane 2 to lift a fabricated attachment rod 4. When binding the lifting points (two), make sure the attachment rod 4 is horizontal. Connect the end with a pin hole of the attachment rod 4 to the pin hole of the attachment ring through a pin. Connect the other end to the steel column (round pipe 450×20) of the building through an adjustable screw rod and a hoop iron piece (the hoop is made of Q355B 480*16 and is connected with 4 M24 8.8-grade high-strength bolts on each side), and then connect it to the attachment rod 4 with a 50-pin. Install the other three attachment rods 4 in the same way. Before connecting with the pin, use two theodolites to check the verticality of the tower body in two directions. By means of lifting counterweights and rotating the boom, ensure that the verticality error of the four sides of the main chord rod should not be greater than 1.5 / 1000 (for the wall attachment rod: SYT80 (T6012-6) is a four-bar mechanism). The length adjustment of the attachment rod 4 can be used to adjust the verticality of the tower body through the adjustable screw rod.

[0162] During the hoisting process of the attachment rod 4, the signals sent by the command post must be clear and definite. Before the driver receives the instruction or the instruction is not clear, operation is strictly prohibited. When in place, the commander should require the driver to operate by inching. For the long attachment rod 4, a pull rope must be tied at one end during in-place to ensure that the attachment rod 4 does not hit the tower body, the operators on the working platform or the external scaffolding during hoisting and in-place.

[0163] A gangplank for people to access the tower crane from the building can be erected on the attachment frame, but it is strictly prohibited to stack heavy objects.

[0164] The connections between the attachment struts and the attachment frames, connection bases, as well as between the attachment frames and the tower body and internal struts must be reliable. The internal struts should firmly press against the main chords of the tower body and clamp with the web members of the tower body. All connection bolts should be tightened properly. After adjusting the verticality, the nuts should be tightened. The split pins should be opened as specified, and it should be regularly checked whether loosening occurs during operation and adjusted in a timely manner.

[0165] 6) Jacking and adding sections

[0166] Safety requirements during jacking

[0167] A. When the wind force suddenly increases to level 6 during operation, it is necessary to immediately stop, and the lower slewing bearing should be firmly connected to the standard section 202 with the standard section 202 pins.

[0168] B. During the jacking process, it is necessary to ensure that the boom is in the same direction as the direction of introducing the tower body section, and use the slewing mechanism brake to brake the boom. The load trolley must stop at the jacking trimming position.

[0169] C. If several tower body sections are to be continuously added, then after each section is added and before the tower crane hoists the next tower body section, 8 special bolts must be used to connect the main chords of the tower body and the lower slewing bearing. Only in this case, it is allowed to use only one nut for these 8 bolts (the bolt pre-tightening torque is 2400 N.m).

[0170] D. The steps on the added tower body section must be aligned with the existing tower body section.

[0171] E. Before the lower slewing bearing and the tower body are properly connected with high-strength bolts, it is strictly prohibited to slewing the boom, change the amplitude of the trolley and hoisting operations.

[0172] F. During the jacking process, if any abnormality occurs in the jacking hydraulic system, it is necessary to immediately stop jacking, retract the cylinder, lower the lower slewing bearing onto the top of the tower body, and firmly connect the lower slewing bearing to the tower body section with 8 high-strength bolts, and then troubleshoot the hydraulic system.

[0173] G. After the tower crane has completed adding sections, rotate the boom to different angles to check the fastening conditions of the connection bolts at the joints of the tower body and the foundation legs.

[0174] H. A certain amount of grease should be applied at the bolt connection holes of every two standard sections 202 during jacking, and the bolts should be able to be easily inserted into the bolt holes. Otherwise, the position of the introduced standard section 202 should be appropriately adjusted, and the bolt pre-tightening torque should reach 2400 N.m.

[0175] 7) Jacking preparation

[0176] A. Determine the hydraulic oil level and quality according to the requirements of the hydraulic pump station; confirm that the motor wiring is correct, the fan rotation direction is consistent with the marked direction, the manual valve operating lever operates smoothly without jamming; the pipe joints are in good condition without oil leakage; the hydraulic pressure gauge indicates normal. Before operation, the air in the hydraulic cylinder should be drained to prevent cavitation and the hydraulic cylinder from shaking during operation. The throttle valve has been adjusted at the factory and it is strictly prohibited to adjust it during operation.

[0177] B. Before the jacking starts, the hydraulic system should be tested with no load. Extend and retract the hydraulic cylinder several times without load to remove the air in the system, and check whether there is any interference between the moving parts. Repeat to adjust the roller clearance. Only after normal operation can the jacking operation be carried out.

[0178] C. Clean each standard section 202, apply grease to the holes in the connection sleeve of the standard section 202, line up the standard sections 202 to be jacked up and added in a row directly below the boom when in the jacking position. This can ensure that the boom of the tower crane does not need to rotate during the entire jacking and adding section process, thus minimizing the time required for the jacking and adding section process.

[0179] D. Loosen the cable so that its length is slightly greater than the total jacking height, and fasten the cable securely.

[0180] E. Swing the boom to the front of the climbing frame 203, and the counterweight arm is at the rear of the climbing frame 203 (the jacking cylinder is exactly below the counterweight arm).

[0181] F. Prepare the introduction rollers on the introduction platform and prepare the high-strength bolts for the tower body on the platform of the climbing frame 203.

[0182] G. Check the stiffness and strength of the introduction beam and the introduction trolley. The four wheels of the introduction trolley rotate flexibly to ensure good condition.

[0183] H. Warning: During the jacking process, assign a special person to be responsible for observing. Both pin shafts at both ends of the jacking cross beam must be placed within the step arc, and it is required to ensure that the safety pin on the jacking cross beam is fastened well to ensure the safety of the jacking process.

[0184] 8) Balancing before jacking

[0185] A. Before the tower crane is balanced, it is necessary to first lift a standard section 202 and place it on the introduction platform, and then run the load-carrying trolley to the balancing reference position. For the tower crane (55m boom), the jacking and balancing position is that the trolley lifts a standard section 202 of 1240 kg and then runs to the position 14.9 m from the root for balancing, according to "Balancing of the tower crane before jacking in the 'Operation Manual of SYT80 (T6012-6) Tower Crane'".

[0186] During jacking, adjustments must also be made according to the actual situation to ensure that the gaps between the 16 guide wheels of the jacking sleeve and the main chords of the standard section 202 are basically the same (preferably 2 - 3 mm), and then remove the connecting bolts of the four feet of the lower support and the standard section 202. (The trimming position of the tower crane and the lifting weight value are taken from the relevant values in the operation manual of the corresponding model tower crane)

[0187] Before operating the hydraulic pump station, first conduct an unloaded inspection of the hydraulic system for no less than two strokes, and check the oil gauge. Push the control lever of the hydraulic jacking system to the tower lowering direction to lift the climbing frame 203 until the feet of the lower support just leave the main chords of the tower body. During this process, pay attention to the pointer indication scale of the hydraulic oil gauge, and the pointer indication shall not exceed 31.5 Mpa.

[0188] B. Push the control lever of the hydraulic jacking system to the jacking direction to lift the climbing frame 203 until the feet of the lower support just leave the main chords of the tower body.

[0189] C. Check whether the feet connecting the lower support and the standard section 202 are on the same vertical line with the main chords of the tower body, and observe whether the gaps between the 8 guide wheels on the climbing frame 203 and the main chords of the tower body are basically the same to check whether the tower crane is balanced. If it is not balanced, adjust the trimming position of the load trolley until it is balanced, so that the center of gravity of the upper part of the tower crane falls on the position of the jacking oil cylinder beam. (During this process, the slewing of the boom is strictly prohibited).

[0190] D. Record the trimming position of the load trolley, or a cloth strip can also be tied to the diagonal web member at this place as a mark. However, it should be noted that the position of this mark changes with the length of the boom, and the mark should be removed afterwards.

[0191] E. Operate the hydraulic system to lower the sleeve, and connect the connecting bolts between the lower support and the standard section 202 (the pre-tightening torque is 2400 N.m).

[0192] 9) Jacking and adding section operation

[0193] A. Use a wire rope of 6×19, with a diameter of 23 mm and a length of 1 m, fold it in half and put it on the diagonal chords in the middle of the standard section 202, lift it to directly above the introduction platform of the climbing frame 203, install four introduction rollers at the lower end of the standard section 202, slowly lower the hook so that the introduction rollers installed on the standard section 202 fall on the introduction platform more appropriately, and then remove the hook.

[0194] B. Drive the trolley to the jacking balance position.

[0195] C. Use the slewing brake on the slewing mechanism to brake the upper mechanism of the tower crane, and no slewing movement is allowed.

[0196] D. Remove the 12 high-strength bolts connecting the top of the tower body and the lower support.

[0197] E. ① Place the jacking crossbeam in the arc groove of the 202nd standard section's nearest step (pay special attention to observing whether the pin shafts at both ends of the jacking crossbeam are in the climbing arc groove).

[0198] ② Start the hydraulic system to extend the piston rod. Stop when the climbing frame 203 and the parts above it are jacked up by 10 - 50 mm. Check whether there are abnormal noises, deformations and other abnormal conditions in the force - transmitting components such as the jacking crossbeam and the climbing frame 203. After confirming normal, continue to jack up. After jacking up more than half of the height of a standard section 202 and making the movable climbing claws on the climbing frame 203 slide over a pair of steps and automatically reset, stop jacking up, and retract the oil cylinder so that the movable climbing claws of the climbing frame 203 rest on the pair of steps above the steps jacked by the jacking crossbeam.

[0199] ③ After confirming that the two movable climbing claws are accurately hooked on the top of the steps, fully retract the piston of the oil cylinder, lift the jacking crossbeam, and reuse the jacking crossbeam to place it in the arc groove of the pair of steps above the standard section 202. Extend the oil cylinder again to jack up the upper structure of the tower crane slightly more than half of the height of a standard section 202. At this time, there is just enough space above the tower body to install a standard section 202. Guide the standard section 202 on the introduction platform of the climbing frame 203 to directly above the tower body. Slightly retract the oil cylinder, let the newly introduced standard section 202 fall on the top of the tower body, align it (if not aligned, use a crowbar to nudge it into alignment), remove the introduction rollers, connect the standard section 202 with special high - strength bolts, and install the locknut (the pre - tightening torque of the locknut in the double - nut should be slightly greater than 2400 N.m).

[0200] ④ Retract the oil cylinder again, let the lower support fall on the top of the new tower body and align it, and firmly connect the lower support to the tower body with the standard section 202 bolts. Thus, the addition of one standard section 202 is completed.

[0201] ⑤ If several standard sections 202 are added continuously, the above steps can be repeated several times.

[0202] F. After the jacking is completed, use 8 high - strength bolts of M36 (each bolt must have two nuts and two washers) to firmly connect the standard section 202 with the lower slewing bearing (the pre - tightening torque of the bolts is 2400 N.m, and the pre - tightening torque of the locknut in the double - nut should be slightly greater than 2400 N.m)

[0203] G. During the jacking process, the jacking anti - detachment bag must be used during jacking, and pay attention to the installation and disassembly of the cotter pins in a timely manner when changing steps.

[0204] H. During jacking, it is necessary to check the steps of the standard section 202 and the jacking crossbeam of the hydraulic jacking system.

[0205] 10) Technical measures for jacking and attaching walls

[0206] Before jacking up, the cable must be loosened so that the length of the loosened cable is slightly greater than the total climbing height.

[0207] During the jacking-up process, the boom must be locked by using the slewing mechanism brake, and it is strictly prohibited to slewing the boom. Ensure that the boom is in the same direction as the tower body standard section 202 introduced.

[0208] When continuously adding sections, after adding one section, before lifting the next standard section 202 with the tower crane, there must be a main bolt connection for each main chord of the tower body and the lower support.

[0209] The steps of the added standard section 202 must be aligned with the existing tower body sections.

[0210] To make the lower support fall smoothly on the top of the tower body and align the connection bolt holes, before retracting the oil cylinder, four guide rods (one for each corner) can be inserted from top to bottom into the bolt holes at the four corners of the lower support, and then the oil cylinder is retracted to lower the lower support.

[0211] If an abnormality occurs in the hydraulic system during the jacking-up process and the balance valve in the oil cylinder causes the piston rod of the oil cylinder to stop jacking up, and at this time the standard section 202 is separated from the lower support, the following measures should be taken:

[0212] ① Check the cause of the failure, promptly eliminate the failure and resume work.

[0213] ② After finding out the cause of the failure, if the failure cannot be eliminated in a short time, the lower support and the standard section 202 should be reinforced with steel wire ropes.

[0214] The four groups of attachment struts of each attachment frame should be on the same horizontal plane. The height difference between the attachment frame and the connection base is allowed to be no more than 200 mm.

[0215] One end of the attachment rod with a pin hole is connected to the attachment frame with a pin, and the split pin should be installed according to the regulations. The other end of the attachment rod is connected to the steel column of the steel structure through an adjustable screw rod to form a hinge joint.

[0216] After the jacking-up and adding sections are completed, fix the cable every three standard sections 202 on the cross bar of the standard section 202 with porcelain insulators.

[0217] The hoop steel is Q355B steel. Each attachment wall consists of two hoops with dimensions of 450×20 mm. When embedding, ensure that the centers of the embedded parts are on the same horizontal plane. The material, dimensions and quality of the high-strength bolts of the hoops must be inspected and accepted by the quality inspection personnel of the project department, and there must be relevant materials. Construction is only allowed after confirmation of compliance. The position of the hoops must be installed strictly according to the elevation, axis, horizontal distance, etc. in the attachment wall plan. For details, please refer to the "Attachment Wall Drawing of SYT80(T6012-6) Tower Crane" respectively.

[0218] During the jacking-up and adding section process of the tower crane, slewing, hoisting and lifting operations are strictly prohibited; if any abnormality occurs during the jacking-up process

[0219] Under normal circumstances, the jacking should be stopped in time to troubleshoot.

[0220] The threads of the connecting bolts of the tower body sections should face upwards (i.e., when inserting the bolts, from bottom to top). For tower cranes: the pre-tightening torque of M36 high-strength bolts is 2400 N·m. Each high-strength bolt should be screwed into two flat washers and two nuts and tightened to prevent loosening. The pre-tightening torque of the locknut in the double-nut arrangement should be slightly greater than 2400 N·m.

[0221] If the lifting weight of Tower Crane 2 during construction is above 10 KN, as reinforcement, 4 sets of wire rope guy ropes need to be set up between the tower body at 30 m and the ground. The ground adopts the form of ground anchors (4 reinforcing bars with a depth of 1 m) to connect with the medium-differentiated limestone under the mountain to increase the stability of the tower body.

[0222] The construction method of Frame Structure 1 is as follows:

[0223] Step 5.2.1: Use the erected Tower Crane 2 to gradually build the elevator shaft frame 101 of the first height on the tower foundation of Frame Structure 1;

[0224] Step 5.2.2: Install the first support 104 on the elevator shaft frame 101 of the first height, so that one end of the first support 104 is connected to the elevator shaft frame 101 of the first height, and the other end is connected to the attachment wall;

[0225] Step 5.2.3: Gradually erect the first-height curved column 102 and ring beam 103 between the elevator shaft frame 101 of the first height and the ground. Among them, one end of the first-height curved column 102 is connected to the ground, and the other end arcs upwards. One end of the first-height ring beam 103 is connected to the elevator shaft frame 101, and the other end is connected to the curved column 102, so that the heights of the first-height curved column 102 and ring beam 103 are flush with the elevator shaft frame 101 of the first height;

[0226] Step 5.2.4: On the elevator shaft frame 101 of the first height, gradually build the elevator shaft frame 101 of the second height;

[0227] Step 5.2.5: Install the second support 105 on the elevator shaft frame 101 of the second height, so that one end of the second support 105 is connected to the elevator shaft frame 101 of the second height, and the other end is connected to the attachment wall. Among them, the second support 105 corresponds to the position of the first support 104 and is in a parallel state;

[0228] Step 5.2.6: Gradually build the curved columns 102 and ring beams 103 at the second height on the curved columns 102 and ring beams 103 at the first height, so that the curved columns 102 and ring beams 103 at the second height are flush with the elevator shaft frame 101 at the second height. Among them, one end of the curved column 102 at the second height is connected to the end of the curved column 102 at the first height, and the other end is curved upwards. One end of the ring beam 103 at the second height is connected to the curved column 102, and the other end is connected to the elevator shaft frame 101 at the second height;

[0229] Step 5.2.7: Build the elevator shaft frame 101 at the third height on the top of the elevator shaft frame 101 at the second height, and install the support platform 107 on the elevator shaft frame 101 at the third height;

[0230] Step 5.2.8: Build the curved columns 102 and ring beams 103 at the third height between the support platform 107 and the curved columns 102 and ring beams 103 at the second height, so that one end of the curved column 102 at the third height is connected to the curved column 102 at the second height, and the other end is connected to the support platform 107;

[0231] Step 5.2.9: Install the third support 106 on the support platform 107, and make the third support 106 correspond to the position of the second support 105 and be arranged in parallel. One end of the third support 106 is connected to the support platform 107, and the other end is connected to the attachment wall;

[0232] Step 5.2.10: Erect the fourth support between the second support 105 and the third support 106, so that one end of the fourth support is connected to the second support 105, and the other end is connected to the third support 106. Among them, the fourth support is perpendicular to the second support and the third support 106 respectively, and the construction of the frame structure 1 is completed;

[0233] Step 5.2.11: Install corresponding equipment on the frame structure 1 according to actual needs.

[0234] During the construction of the frame structure 1, during the construction of each section of the elevator shaft frame 101, curved column 102, ring beam 103, first support 104, second support 105, third support 106, fourth support and support platform 107, construction checking calculations shall be carried out.

[0235] The checking calculation method is as follows:

[0236] 1. All calculations are carried out using midas software.

[0237] 2. The seismic fortification intensity for structural design is calculated according to degree 7.

[0238] 3. Wind load: The wind load during construction is taken as 0.30 KN / m2.

[0239] 4. The steel used is Q355B.

[0240] According to the specification: GB50017 - 2017

[0241] Stress checking load combination (basic combination):

[0242] Combination number, Combination name, Coefficient (working condition) + Coefficient (working condition) + Coefficient (working condition)

[0243] 11 Total (1.000)

[0244] Deflection checking load combination (standard combination):

[0245] Combination number, Combination name, Coefficient (working condition) + Coefficient (working condition) + Coefficient (working condition)

[0246] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0247] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0248] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0249] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0250] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method for a frame structure on a soft soil foundation with a high water level, characterized in that, It includes the following steps: Step 1: Obtain the deepened topographic map of the high water table foundation; Step 2: Carry out paving treatment on the ground according to the deepened topographic map to form a building layer; Step 3: Determine the positions of the tower crane and the frame structure according to the deepened topographic map; Step 4: Construct the foundation pits of the tower crane and the frame structure, and pour the tower bases of the tower crane and the frame structure in the foundation pits; Step 5: Gradually erect the tower crane, and erect the frame structure adjacent to the rock mass through the tower crane.

2. The construction method of a frame structure for a high water table soft soil foundation according to claim 1, characterized in that, The step of obtaining the deepened topographic map of the high water table foundation in Step 1 includes the steps of: obtaining the bearing capacity of each underground soil layer; obtaining the height of the underground water level and analyzing the reasons for geological water content.

3. A construction method for a frame structure on a soft soil foundation with a high water level, characterized in that, The building layer in Step 2 is, from top to bottom: the Quaternary artificial fill layer, the Quaternary upper Pleistocene alluvial layer, and the Permian lower Maokou Formation bedrock.

4. A construction method for a frame structure on a high water table soft soil foundation according to claim 1, characterized in that, The method for erecting the tower crane in Step 5 includes: Step 5.1.1: Install vertical bars inside the tower base of the preset tower crane, and erect the foundation section through anchor bolts; Step 5.1.2: Install a standard section on the top of the foundation section, and at the same time install a climbing frame on the standard section, and install a slewing assembly on the top of the standard section; Step 5.1.3: Correct the verticality of the standard section; Step 5.1.4: Install a tower cap assembly, a counter jib assembly, and a boom assembly on the slewing assembly; Step 5.1.5: Install a hoisting component at the end of the counter jib assembly; Step 5.1.6: Install several tie rods between the tower cap and the counter jib assembly and the boom assembly to form a triangular structure; Step 5.7: After the tower crane is installed, make preparations for trial operation, and conduct no-load tests and load tests.

5. The construction method of a frame structure for a high water table soft soil foundation according to claim 4, characterized in that, When erecting the frame structure that exceeds the height of the tower crane, remove the tower cap, increase the length of the standard section, and the disassembly method of the tower crane is opposite to the installation method.

6. A construction method for a frame structure on a high water table soft soil foundation according to claim 4, characterized in that, The verticality correction in Step 5.1.3 is to open a first connection point, a second connection point, and a third connection point on the standard section, and open a first pin hole and a second pin hole on the corresponding attachment wall. Horizontally lift two attachment rods respectively by a crane, connect one end of the attachment rod to the first pin hole, and connect the other ends of the two attachment rods to the first connection point and the second connection point respectively through adjustable screw rods to form a triangular structure; Horizontally lift two attachment rods respectively by a crane, connect one end of the attachment rod to the second pin hole, and connect the other ends of the two attachment rods to the second connection point and the third connection point respectively through adjustable screw rods to form a triangular structure; Adjust the verticality of the standard section by adjusting the length of the adjustable screw rod. During this process, detect the verticality of the standard section in two different directions through a theodolite.

7. A construction method for a frame structure of a high water level soft soil foundation according to claim 1, characterized in that, The method for erecting the frame structure in Step 5 is: Step 5.2.1: Gradually erect the elevator shaft frame of the first height on the tower base of the frame structure through the erected tower crane; Step 5.2.2: Install a first support on the erected elevator shaft frame of the first height, so that one end of the first support is connected to the elevator shaft frame of the first height and the other end is connected to the attachment wall; Step 5.2.3: Gradually erect the curved columns and ring beams of the first height between the elevator shaft tower of the first height and the ground. One end of the curved column of the first height is connected to the ground, and the other end curves upward. One end of the ring beam of the first height is connected to the elevator shaft tower, and the other end is connected to the curved column, so that the heights of the curved column and ring beam of the first height are flush with the elevator shaft tower of the first height; Step 5.2.4: On the elevator shaft tower of the first height, gradually build the elevator shaft tower of the second height; Step 5.2.5: Install the second support on the elevator shaft tower of the second height, so that one end of the second support is connected to the elevator shaft tower of the second height, and the other end is connected to the attachment wall. The second support corresponds to the first support in position and is in a parallel state; Step 5.2.6: Gradually build the curved columns and ring beams of the second height on the curved columns and ring beams of the first height, so that the curved columns and ring beams of the second height are flush with the elevator shaft tower of the second height. One end of the curved column of the second height is connected to the end of the curved column of the first height, and the other end curves upward. One end of the ring beam of the second height is connected to the curved column, and the other end is connected to the elevator shaft tower of the second height; Step 5.2.7: Build the elevator shaft tower of the third height on the top of the elevator shaft tower of the second height, and install a support platform on the elevator shaft tower of the third height; Step 5.2.8: By building the curved columns and ring beams of the third height between the support platform and the curved columns and ring beams of the second height, one end of the curved column of the third height is connected to the curved column of the second height, and the other end is connected to the support platform; Step 5.2.9: Install the third support on the support platform, and make the third support correspond to the second support in position and be arranged in parallel. One end of the third support is connected to the support platform, and the other end is connected to the attachment wall; Step 5.2.10: Erect the fourth support between the second support and the third support, so that one end of the fourth support is connected to the second support, and the other end is connected to the third support. The fourth support is perpendicular to the second support and the third support respectively, and the fourth support is removed after the frame structure is built; Step 5.2.11: Install corresponding equipment on the frame structure according to actual needs.

8. A construction method for a frame structure on a soft soil foundation with a high water level, characterized in that, During the construction of the frame structure, during the construction of each section of the elevator shaft tower, curved column, ring beam, first support, second support, third support, fourth support and support platform, construction checking calculations shall be carried out.

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