CN112141918A

CN112141918A - Method and device for hoisting megawatt tower type heat collector by using hoisting portal

Info

Publication number: CN112141918A
Application number: CN202011110824.6A
Authority: CN
Inventors: 黄桂宝; 陈集农; 袁大鹏; 钟成春; 刘巍; 谭杰; 邓林
Original assignee: China Energy Construction Group Hunan Thermal Power Construction Co ltd
Current assignee: China Energy Construction Group Hunan Thermal Power Construction Co ltd; Shanghai Electric Group Corp
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2020-12-29
Anticipated expiration: 2040-10-16
Also published as: CN112141918B

Abstract

The method and the hoisting device for hoisting the megawatt tower type heat collector by using the hoisting portal are characterized in that a heat absorption tower is firstly arranged on the ground at the installation position of the tower type photo-thermal power generation heat collector, and an internal space for hoisting the tower type photo-thermal power generation heat collector is reserved in the heat absorption tower according to the size of the tower type photo-thermal power generation heat collector; and then, hoisting the megawatt tower type photo-thermal power generation heat collector integrally from the bottom inside the heat absorption tower to the top of the heat absorption tower by using a portal frame and a hydraulic crane from the top of the heat absorption tower by utilizing the space in the heat absorption tower, and then integrally installing and positioning. According to the invention, the megawatt tower type photo-thermal power generation heat collector is hoisted to the top of the tower through the inside of the heat absorption tower, so that the construction period can be effectively shortened, a large amount of overhead work is reduced, and the safe construction is greatly ensured.

Description

Method and device for hoisting megawatt tower type heat collector by using hoisting portal

Technical Field

The invention relates to a hoisting method and a hoisting device of a tower type photo-thermal power generation system, in particular to a method and a hoisting device for hoisting a megawatt tower type heat collector by using a hoisting portal; the method and the hoisting device for hoisting the megawatt tower type heat collector by using the hoisting portal can effectively prevent the megawatt tower type photo-thermal power generation heat collector from being out of order in the hoisting process; belongs to the technical field of heavy object hoisting operation.

Background

The solar photo-thermal power generation is realized by collecting solar heat energy by utilizing a large-scale array parabolic or dish-shaped mirror surface, providing steam through a heat exchange device and combining the process of a traditional turbonator. The solar photo-thermal power generation technology is adopted, so that an expensive silicon crystal photoelectric conversion process is avoided, and the cost of solar power generation can be greatly reduced. Moreover, the solar energy utilization in the form has an incomparable advantage compared with other forms of solar energy conversion, namely water heated by solar energy can be stored in a huge container, and a turbine can still be driven to generate electricity for several hours after the sun lands. Therefore, as the technology is improved continuously and the environmental protection is paid more and more attention in the world, the solar photo-thermal power generation is more and more commonly applied in all parts of the world and the power of the power generation is also more and more increased as the photo-thermal power generation is taken as a clean energy source. Solar photo-thermal power generation becomes an important direction for new energy utilization.

According to different solar energy collection modes, solar photo-thermal power generation is mainly divided into four types, namely tower type, groove type, disc type and linear Fresnel type. The tower type solar photo-thermal power generation has better development prospect because the tower type solar photo-thermal power generation has the comprehensive advantages of slot type, butterfly type, linear Fresnel type and the like which are difficult to compare favorably in the aspects of scale, photoelectric conversion efficiency, investment cost and the like, and the development and research of the tower type photo-thermal power generation technology are more and more concerned in all countries at present.

The tower-type solar photo-thermal power generation mainly comprises a heliostat field consisting of a plurality of heliostats, solar energy is reflected and concentrated on a high-temperature receiver (also called a heat collector) at the top of a high tower in the middle of the heliostat field, is converted into heat energy, is transmitted to a working medium to be heated, passes through a heat accumulator and is input into a heat engine to drive a generator to generate power. The tower type photo-thermal power generation system consists of five subsystems, namely a light condensation subsystem, a heat collection subsystem, a power generation subsystem, a heat storage subsystem and an auxiliary energy subsystem. Wherein, the light-gathering subsystem and the heat-collecting subsystem form the core technology. One key point for the construction and installation of the tower type photo-thermal power station is the installation of the heat collector. Along with the increasing power of solar photo-thermal power generation, the heat collector is also increasing, and the heat collector is generally integrally hoisted to the heat absorption tower after being combined on the ground, so that the total project period can be shortened, and the installation quality can be ensured. At present, the heat collectors are all installed by adopting tower cranes, which is still applicable to small and medium-sized tower type solar photo-thermal power generation systems below megawatt level, but once the megawatt level is reached, a simple tower type hoisting mode is adopted, which is very difficult, and a hoisting task can be completed only by the cooperative coordination of a plurality of tower cranes; if the tower is disassembled for hoisting, the assembly is needed on the top of the tower, which causes much inconvenience to the construction, so that the improvement is needed.

Through patent search, no relevant patent technical literature reports are found, the most relevant patent technical literature is a paper, and the relevant literature includes the following:

1. the utility model is a utility model with the patent number of CN201920324645.9 and the name of 'a construction device for building electrical equipment', the patent discloses a building electrical equipment construction equipment, including the portal frame, the inside level of portal frame is equipped with the fixed plate, the below of fixed plate is equipped with clamping mechanism, the both sides of fixed plate are all fixed and are equipped with the head rod, the equal vertical first bar hole of having seted up of inside wall that the portal frame is relative, the equal vertical one-way screw rod that is equipped with in inside in two first bar holes, the both ends of two one-way screw rods are all rotated with the upper and lower both sides that correspond first bar groove through first antifriction bearing and are connected and the upper end all runs through to the top of portal frame and all fix and be equipped with first bevel gear, the equal sliding connection in inside in two first bar grooves has first movable block, the upside of two first movable blocks all is through the pole wall threaded connection of first screw hole and two one.

2. The patent number is CN202010365560.2, and is named as an invention patent of 'a groove type solar heat collector hoisting and positioning method', and the patent discloses a groove type solar heat collector hoisting and positioning method, which comprises the following steps: s1, hoisting the two groove type solar heat collectors; s2, hoisting the rest of the trough type solar thermal collectors; and S3, adjusting and connecting the groove type solar heat collector. When the trough type solar thermal collector is lifted, all the trough type solar thermal collectors are matched with the positioning shaft and the positioning hole to position the center position, and then the orientation of the trough type solar thermal collector is adjusted. When the indication readings of the leveling instrument aligned to the tower rulers hung at the symmetrical structural positions on the cantilevers at the left side and the right side of the trough-type solar heat collector are the same, the indication that the trough-type solar heat collector is just upward in the positive direction is meant. All the groove type solar heat collectors can be conveniently adjusted to be upwards forward and then fixedly connected with the adjacent groove type solar heat collectors.

3. The patent number is CN201620778657.5, the utility model patent of "light and heat electricity generation heat collector module integral hoisting hoist" this patent discloses light and heat electricity generation heat collector module integral hoisting hoist, and it is big to have solved heat collector module overall dimension, hoists difficult technical problem. The central position of cross arm is provided with U-shaped front bracket in the front, and the central position of cross arm is provided with U-shaped rear bracket in the back, and the torque tube on the heat collector module sets up in U-shaped front bracket and U-shaped rear bracket, has connect preceding semicircular staple bolt in the front end of torque tube lock, and preceding semicircular staple bolt links together with U-shaped front bracket, has connect latter half circular staple bolt in the rear end lock of torque tube, and latter half circular staple bolt links together with U-shaped rear bracket.

Through the analysis of the patent documents, the inventor finds that the patents relate to hoisting, and also relate to the research on integral hoisting of the solar-thermal power generation heat collector module, and also provides some improved technical schemes, but the technical schemes still have some problems, and still do not solve the problems that how to solve the problems that the tower type solar photo-thermal power generation heat collector is too heavy and how to carry out integral hoisting in the hoisting process, so that a plurality of unexpected problems and faults still occur in the practical application, and therefore further research is still needed.

Disclosure of Invention

The invention aims to provide a novel method for hoisting a megawatt tower type heat collector by using a hoisting portal and a mounting system device aiming at the defects of the existing method for hoisting the megawatt tower type heat collector by using the hoisting portal.

In order to achieve the purpose, the invention provides a method for hoisting a megawatt tower type heat collector by utilizing a hoisting portal frame, wherein a heat absorption tower is firstly arranged on the ground at the installation position of the tower type photo-thermal power generation heat collector, and an internal space for hoisting the tower type photo-thermal power generation heat collector is reserved in the heat absorption tower according to the size of the tower type photo-thermal power generation heat collector; and then, hoisting the megawatt tower type photo-thermal power generation heat collector integrally from the bottom inside the heat absorption tower to the top of the heat absorption tower by using a portal frame and a hydraulic crane from the top of the heat absorption tower by utilizing the space in the heat absorption tower, and then integrally installing and positioning.

Furthermore, the internal space reserved in the heat absorption tower according to the size of the tower type photo-thermal power generation heat collector for hoisting the tower type photo-thermal power generation heat collector adopts a hollow heat absorption tower structure, and a hollow area matched with the diameter of the tower type photo-thermal power generation heat collector is reserved in the heat absorption tower, so that the tower type photo-thermal power generation heat collector is integrally hoisted to the top of the heat absorption tower from the bottom; and an access door for the tower-type photo-thermal power generation heat collector to enter and exit is reserved on the side surface of the heat absorption tower, so that the tower-type photo-thermal power generation heat collector integrally slides to the center inside the heat absorption tower.

Furthermore, the whole tower type photo-thermal power generation heat collector is hoisted to the top of the heat absorption tower from the bottom of the heat absorption tower by adopting the portal frame and the hydraulic crane from the top of the heat absorption tower, a plurality of portal frames are arranged on the top of the heat absorption tower around the circumference of the top of the heat absorption tower, the hydraulic crane is arranged on the portal frame, each set of hydraulic crane discharges steel strands from the tower, the steel strands of each set of hydraulic crane are respectively connected with steel beam lifting lugs at the bottom of the heat collector by using anchors and pin shafts, the hydraulic cranes arranged on the plurality of portal frames are arranged on the circumference to run synchronously, and the whole tower type photo-thermal power generation heat collector is hoisted to the top of.

Furthermore, the synchronous operation of the hydraulic cranes is that a plurality of hydraulic cranes lift or move structural weights through the increment of the hydraulic steel strand jacks, and the increment of each time is equivalent to the stroke of the hydraulic steel strand jacks; the hydraulic steel strand jack is lifted or pulled by the jack pistons to extend or retract in sequence to realize the integral lifting of the tower type photo-thermal power generation heat collector.

The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 3, wherein the method comprises the following steps: the synchronous operation of the hydraulic cranes is that a plurality of hydraulic cranes lift or move structural weights through the increment of the hydraulic steel strand jacks, and the increment of each time is equivalent to the stroke of the hydraulic steel strand jacks; the plurality of door frames are connected into a whole through I-shaped steel and fasteners at the top of the heat absorption tower, so that the door frames are prevented from swinging under the influence of wind power in the hoisting process; the hydraulic steel strand jack is lifted or pulled by sequentially extending or retracting a jack piston to realize the integral lifting of the tower type photo-thermal power generation heat collector; the hydraulic steel strand jack is provided with a wedge-shaped clamping mechanism, the wedge-shaped clamping mechanism automatically locks the steel strand, the steel strand passes through the jack when the piston extends out, and then the steel strand is locked at a new position when the piston retracts and resets.

Furthermore, the lower end of the hydraulic steel strand is connected with a lifting lug, and the lifting lug is connected with the tower type photo-thermal power generation heat collector through a bottom supporting beam of the heat collector; on one hand, the bottom supporting beam of the heat collector is connected to the bottom of the tower type solar-thermal power generation heat collector through a fastener, and plays a supporting role in supporting the tower type solar-thermal power generation heat collector; on the other hand, a hoisting block integrally connected with the bottom supporting beam of the heat collector protrudes upwards from the outer end part of the bottom supporting beam of the heat collector, and a bolt matched with the lifting lug is arranged on the hoisting block; during hoisting, the lifting lug falls into the hoisting block and is inserted into the lifting lug through a bolt on the hoisting block to form connection with the lifting lug.

Furthermore, in order to avoid damage to heat collector equipment caused by collision during hoisting, an anti-collision block is arranged at the outer end part of a supporting beam at the bottom of the heat collector and is fixed at the rear end of a fixed anchor by using a bolt, and the anti-collision block is used for preventing the heat collector from colliding with the inner wall of the concrete tower body; the anti-collision block consists of a connecting steel plate and a rubber block and is fixed on a supporting cross beam at the bottom of the heat collector by bolts.

Furthermore, the integral installation and positioning is that a fixed anchor is connected below a supporting beam at the bottom of the heat collector, and the fixed anchor is moved into a cylinder wall groove arranged at the top of the heat absorption tower through a moving device after the tower-type solar-thermal power generation heat collector is hoisted to the top, and is locked and fixed.

A hoisting system for hoisting a megawatt tower type heat collector by utilizing hoisting gantries comprises a heat absorption tower, a plurality of gantries, a hydraulic crane, a heat collector bottom supporting beam and a lifting lug; the portal frame is arranged at the top of the heat absorption tower, the hydraulic crane is arranged on the portal frame and is provided with a hydraulic steel strand jack, and the hydraulic steel strand jack is connected with the lifting lug through a steel strand; a plurality of gantries provided with hydraulic cranes are combined to form a hoisting system of the tower type photo-thermal power generation heat collector, and the hydraulic steel strand jacks of the hydraulic cranes are matched with the bottom supporting beams and the lifting lugs of the heat collector to hoist the whole tower type photo-thermal power generation heat collector to the top of a heat absorption tower from the inner space of the heat absorption tower.

Furthermore, the plurality of door frames are connected into a whole through I-shaped steel and fasteners at the top of the heat absorption tower, so that the door frames are prevented from swinging under the influence of wind power in the hoisting process; the hydraulic steel strand jack is lifted or pulled by sequentially extending or retracting a jack piston; the hydraulic steel strand jack is provided with a wedge-shaped clamping mechanism, the wedge-shaped clamping mechanism automatically locks the steel strand, the steel strand passes through the jack when the piston extends out, and then the steel strand is locked at a new position when the piston retracts and resets; the lower end of the hydraulic steel strand is connected with a lifting lug, and the lifting lug is connected with the tower type photo-thermal power generation heat collector through a bottom supporting beam of the heat collector; on one hand, the bottom supporting beam of the heat collector is connected to the bottom of the tower type solar-thermal power generation heat collector through a fastener, and plays a supporting role in supporting the tower type solar-thermal power generation heat collector; on the other hand, a hoisting block integrally connected with the bottom supporting beam of the heat collector protrudes upwards from the outer end part of the bottom supporting beam of the heat collector, and a bolt matched with the lifting lug is arranged on the hoisting block; during hoisting, the lifting lug falls into the hoisting block and is inserted into the lifting lug through a bolt on the hoisting block to form connection with the lifting lug.

In order to avoid damage to heat collector equipment caused by collision during hoisting, an anti-collision block is arranged at the outer end part of a bottom supporting beam of the heat collector and is fixed at the outer end part of the bottom supporting beam of the heat collector by using bolts, and the anti-collision block is used for preventing the heat collector from colliding with the inner wall of a concrete tower body; the anti-collision block consists of a connecting steel plate and a rubber block and is fixed on the outer end part of the bottom supporting beam of the heat collector by bolts; the fixing anchor is connected below the supporting cross beam at the bottom of the heat collector, and after the tower type solar-thermal power generation heat collector is hoisted to the top, the fixing anchor moves into a groove in the wall of the cylinder at the top of the heat absorption tower through the moving device and is locked and fixed.

If the tower type photo-thermal power generation heat collector needs to be temporarily descended, in the descending process, the automatic operation of covering the hydraulic steel strand jack by a secondary hydraulic system by using a clamping mechanism in the hydraulic steel strand jack is needed; the jack can be opened without lifting in the resetting process, and the steel strand is allowed to pass through the lower handle when actually put down. The fault protection mechanism in the hydraulic steel strand jack can ensure that the load is automatically locked in the bottom anchoring piece of the jack when any hydraulic fault or power supply fault occurs. This same feature also provides a facility for stopping the lifting operation and transferring the load from the hydraulic system to the mechanical means of the bottom anchor at any part of the jack stroke, thereby eliminating the need to hold the load on the hydraulic system for long periods of time. As an additional function, both the jack piston and the main anchor below the jack can be serviced with the jack system suspended, if desired. The distal ends of the lifting strands are secured using an anchor block having the same braking mechanism as used in the jack.

The invention has the advantages that: the tower type photo-thermal power generation heat collector is integrally hoisted by utilizing the internal space of the center of the heat absorption tower, so that the installation time can be saved, and the installation quality can be improved; the following advantages are mainly provided:

1. the invention solves the problems that the heat collector is lifted from the tower, the stress is uniform in the operation process, the overload of a single lifting device is avoided, and the safety and the stability are improved.

2. In the continuous lifting process, the tower body has certain deformation due to changes of day and night temperature difference of the external environment, face-sun-back-shadow temperature difference and the like.

3. The hoisting method is optimized, the coordination command is unified, the technical problems of long-time hoisting, weight unloading and the like are solved, and the safety of equipment hoisting is improved.

4. The invention provides a hoisting operation standard table, which provides experience for reference for subsequent similar hoisting.

Drawings

Fig. 1 is a schematic structural view of a hoisting system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a hoisting gantry system according to an embodiment of the present invention;

FIG. 3 is a schematic view of a tie-down anchor and bumper structure according to one embodiment of the present invention;

FIG. 4 is a schematic perspective view of a fixed anchor block and an impact prevention device according to the present invention;

FIG. 5 is an enlarged schematic view of a bump guard of the present invention;

fig. 6 is a schematic structural view of the installation position of the fixed anchor block.

Detailed Description

The invention will be further elucidated with reference to the drawings and specific embodiments.

Example one

As shown in the attached drawing, the hoisting device for hoisting the megawatt tower type heat collector by using the hoisting portal 1 is shown in the attached drawing and comprises a heat absorption tower 6, a plurality of portals 2, a hydraulic crane 3 and a lifting lug 11; the gantry is arranged at the top of the heat absorption tower, the hydraulic crane is arranged on the gantry, the hydraulic crane 3 is provided with a hydraulic steel strand jack 4, and the hydraulic steel strand jack 4 is connected with the lifting lug 11 through a steel strand 7; a plurality of gantries 2 provided with hydraulic cranes 3 are combined to form a hoisting system of the tower type photo-thermal power generation heat collector, and the tower type photo-thermal power generation heat collector is integrally hoisted to a heat absorption tower top 5 through a hydraulic steel strand jack 7 of the hydraulic crane.

The tower type photo-thermal power generation heat collector hoisting system formed by combining a plurality of gantries provided with hydraulic cranes is shown in the attached figure 2, and comprises a plurality of gantries 2 annularly arranged around the top of a heat absorption tower, wherein the gantries 2 are connected into a whole at the top of the heat absorption tower through I-shaped steel and fasteners, so that the gantries are prevented from swinging under the influence of wind power in the hoisting process; each portal frame is provided with a hydraulic crane 3, and a hydraulic steel strand penetrates through the hydraulic crane; the hydraulic steel strand jack is lifted or pulled by sequentially extending or retracting a jack piston; the hydraulic steel strand jack is provided with a wedge-shaped clamping mechanism, the wedge-shaped clamping mechanism automatically locks the steel strand, the steel strand passes through the jack when the piston extends out, and then the steel strand is locked at a new position when the piston retracts and resets; the lower end of the hydraulic steel strand is connected with a lifting lug 11, and the lifting lug 11 is connected with the tower type photo-thermal power generation heat collector through a heat collector bottom supporting beam 12; on one hand, the bottom supporting beam 12 of the heat collector is connected to the bottom 13 of the tower type solar-thermal power generation heat collector through a fastener, and as shown in the attached drawing 3, the bottom supporting beam plays a supporting role on the tower type solar-thermal power generation heat collector; on the other hand, a hoisting block 14 protrudes upwards from the outer end part of the bottom supporting beam 12 of the heat collector, and a bolt matched with the hoisting lug through the hoisting block 14 is inserted into the hoisting lug and connected with the hoisting lug 11; in order to avoid damage to heat collector equipment caused by collision during hoisting, an anti-collision block 15 is arranged at the outer end part of a heat collector bottom supporting cross beam 12, the anti-collision block 15 is fixed at the outer end part of the heat collector bottom supporting cross beam 12 by bolts, and the anti-collision block 15 is used for preventing the heat collector from colliding with the inner wall of a concrete tower body; the anti-collision block 15 is composed of a connecting steel plate and a rubber block and is fixed on a supporting cross beam at the bottom of the heat collector by bolts, as shown in the attached figure 4.

A movable fixed anchor block 16 is arranged on a supporting beam 12 at the bottom of the heat collector, as shown in figure 5; the fixed anchor block 16 consists of two cross beams, namely an upper fixed anchor block 17 and a lower fixed anchor block 18; the middle parts of the upper fixing anchor block and the lower fixing anchor block are connected into a whole by a screw 19, and the vertical distance between the upper fixing anchor block and the lower fixing anchor block is 2450 mm. The fixed anchor block 16 is hung on a track below the bottom supporting beam 12 of the heat collector through a bracket 20 and is driven to move by a push-pull oil cylinder 21.

The integral hoisting method of the heat collector comprises the following steps: and 16 gantries and hydraulic cranes are arranged at the top of the heat absorption tower and are used as main machines for lifting the heat collector. Each set of hydraulic device puts down 12 steel strands from the tower, and 16 groups of steel strands are respectively connected with a steel beam lifting lug at the bottom of the heat collector by using an anchor and a pin shaft. And loosening bolts between the heat collector and the ring beam to lift the heat collector by 5 m. Disassembling the sliding device and the supporting ring beam; mounting a support beam sliding device; connecting the support beam to the sliding device; lifting the heat collector to an embedding height; pushing the support beam into the groove of the cylinder wall; the heat collector is in place; and (5) checking and accepting to be qualified, and pouring grouting material.

The hydraulic steel strand jack is lifted or pulled by sequentially extending or retracting a jack piston; the hydraulic steel strand jack is provided with a wedge-shaped clamping mechanism, the wedge-shaped clamping mechanism automatically locks the steel strand, the steel strand passes through the jack when the piston extends out, and then the steel strand is locked at a new position when the piston retracts and resets.

In the embodiment, 16 gantries and hydraulic cranes are arranged at the top of the heat absorption tower and are used as main machines for lifting the heat collector. Each set of hydraulic device puts down 12 steel strands from the tower, and 16 groups of steel strands are respectively connected with a steel beam lifting lug at the bottom of the heat collector by using an anchor and a pin shaft. And loosening bolts between the heat collector and the ring beam to lift the heat collector by 5 m. Disassembling the sliding device and the supporting ring beam; mounting a support beam sliding device; connecting the support beam to the sliding device; lifting the heat collector to an embedding height; pushing the support beam into the groove of the cylinder wall; the heat collector is in place; and (5) checking and accepting to be qualified, and pouring grouting material.

The integral hoisting device of the heat collector adopts the following steps:

the technical scheme of integral hoisting is as follows: according to the combined weight of the 100MW photo-thermal heat collector, a portal frame, an anti-collision device and lifting lugs are designed, and a reasonable hydraulic lifting device is selected. The combined weight of the heat collector is about 1800t, the diameter is 23.2m, the height is 38m, the supporting ring beam 149t, the single weight of the portal frame is 6t, the load of an operator and a tool is 0.5t/m2, the weight of a steel strand is 5.5t, the weight of a jack is 2t, and the weight of a fixed anchor shell and a fixed pin is 0.5 t.

Step of lifting process

1. Temporary operating platform installation at top of heat collection tower

The platform is arranged at the top of the heat collecting tower, has the elevation of 219.6m and is divided into five types. Platform 1 is used for storing electrical equipment, platform 2 is used for pedestrian's passageway, and platforms 2A and 2B are used for visiting the construction elevator, and platform 3 is as rest area. Small platforms are arranged below the

platforms

1 and 3 and used for platform installation personnel to stand.

(1) The embedded parts of the tower top operation platform are cleaned before installation, the embedded parts of the operation platform are installed strictly according to the drawing size and the position, and protection is needed after the embedded parts are installed, so that large-area pollution caused by concrete is avoided.

(2) And the surface of the embedded part is cleaned after the concrete is solidified, so that the installation of the platform is not influenced. And re-checking the sizes of the embedded parts by referring to a drawing again, if the spacing between the embedded parts changes, recording, and combining according to final measurement data when the platform ground is combined.

(3) And (4) operating platform ground combination. The platform bracket, the I-shaped wood, the steel springboard and the fence are combined on the ground, the size of the bracket is combined according to the center acceptance size of the embedded part, the I-shaped wood and the bracket are fixedly connected through the wood beam connecting claws, and the I-shaped wood and the steel springboard are fixed through the self-tapping screws.

(4) The mounting method of the platforms 2A and 2B comprises the following steps: after the civil construction slip form platform is dismantled, personnel can not go to the tower top through the air ladder, so before the slip form platform is dismantled, the personnel firstly go to the tower top to prepare platform hoisting (slip form dismantling and platform installation seamless connection construction), and the personnel are hoisted to the installation position in sequence by utilizing the construction crane and are fixed. The mounting elevation of the small platform is 219.5m, 1 person of constructors stands on the slip form platform, 1 person stands on the hanging bracket platform below the slip form platform, and two persons simultaneously adjust the clamping grooves of the bracket of the operation platform to be inserted into the gap between the embedded bolt and the tower wall and insert the positioning pin.

(5) After the platforms are installed, gaps between the platforms are filled with steel plates, and the platforms are guaranteed to be free of holes and gaps. In addition, the outer side of the platform rail is laid with a wire mesh, and the outer side of the wire mesh is laid with a dense curtain net.

(6) After the heat collector is installed, the platform is required to be dismantled as a temporary construction facility. The dismounting steps are opposite to the mounting sequence, sundries on the platform and facilities which are not firmly connected are firstly cleaned, and then the platform is sequentially dismounted by the building crane from the side far away from the elevator.

2. Lift mast check

According to the design requirement, 16 lifting gantries are arranged at the top of the heat absorption tower.

Checking and calculating the portal:

collector weight p_t=1800 × 1.1=1980 t; each portal bearing Q₁=1980/16=123.75t

Taking into account other loads Q_t=123.75+ 5.5+2+0.5 ×1.1=132.55t

The safety coefficient is 1.5 times, Q_td=132.55×1.5=198.825t

The collector can be considered as a polygonal (16-sided) cylinder with a surface of about 21 x 35=735 m 2. The drag coefficient of this shape was 1.3.

Assuming that the maximum allowable wind speed at the upper part of the tower is 20m/s (72 km/h), the basic wind pressure can be calculated according to the following formula:

P_w=C²/16=25 𝑘μα/m²

the wind load of each portal frame is H (safety factor of 1.5)_1d=0.025×1.3×735×1.516=2.24t

The probability of an important seismic event occurring during the lifting operation (rather low-0.1 g seismic horizontal acceleration is taken into account, therefore: H_2d=198.825×0.1=19.9t。

Total of H_td=H_1d+H_2d=2.24+19.9=22.14t

The steel plate is made of Q345 or equivalent material. Yield strength 345/1.1=313MPa, bolt 10.9.

Adopting SolidWorks 2016 computer software to establish a 3D model for stress calculation, wherein the reaction force of the pre-buried plate is as follows:

maximum pressure on concrete in vertical direction (for 40mm thick pre-cast steel plate and 300x300 columns):

P=92400×9.81(380×380)=6.3MPa

maximum shear force𝑉=（532²+1260²）^1/2=1368 𝑘μ α each bolt 1368/12 = 114 kgf

Maximum pressure on concrete in vertical plus horizontal direction (for 40mm thick pre-cast steel plate and 300x300 columns):

P=171000×9.81(380×380)=11.6MPa

maximum shear force𝑉=（6661²+2020²）^1/2=6961 kgf each bolt 6961/12 = 580 kgf

Maximum pressure on concrete in vertical plus horizontal and Z directions (for 40mm thick pre-cast steel plate and 300x300 columns):

P=157000×9.81(380×380)=10.7MPa

maximum shear force𝑉=（5880²+6610²）^1/2=8847 kgf each bolt 8847/12 = 737 kgf

3. Lift mast installation

The heat collecting tower top lifting portal comprises 16 independent lifting portals, and a single portal mainly comprises: the hydraulic crane comprises a flange base, a supporting framework, a hydraulic crane arrangement and operation platform and a rope guide pipe. The construction sequence is as follows: the method comprises the steps of gantry ground combination, bottom support flange in place, gantry hoisting in place and adjustment.

(1) Mounting of portal bottom flange

The installation of the bottom support flange of the portal frame is the foundation of the whole installation work, and the installation precision of the portal frame directly influences the in-place of the portal frame and the central position of the hydraulic crane.

And (3) checking an embedded part for installing a portal at the position of the elevation 220m of the heat collecting tower, removing impurities on the surface of the embedded steel plate, and checking the surface flatness and levelness of the embedded steel plate.

And mounting a bottom support flange. The upper surface of the bottom supporting flange is cleaned, and 32 supporting flanges (16 door frames and 2 bottom supporting flanges of each door frame) are placed on the embedded steel plate by using a building crane.

Drawing longitudinal and transverse center lines on the upper surface of the bottom support flange by taking the bolt holes as a reference, measuring and adjusting the sizes, heights and levelness of the diagonal angles and the intervals of the bolts of the adjacent support flanges, strictly controlling the center of the hydraulic crane platform to be aligned with the center line of the support, and keeping all size errors to be not more than 3 mm. And after the requirements are met, spot welding is carried out for fixation. And after all spot welding is finished, rechecking whether the data are changed or not, and welding the bottom support flange on the embedded steel plate after the data are confirmed to be correct. During welding, deformation is controlled, and horizontal changes of the upper flange need to be detected.

(2) Portal combination and installation

The portal assembly is carried out on the ground, and before the assembly, whether the sizes and the serial numbers of all the components are matched with a drawing or not is checked, and the dimension is rechecked after the flange installation acceptance is combined. The combination sequence is as follows: the support legs of the portal frame are combined firstly, then are connected with the hydraulic crane mounting platform through bolts, and finally auxiliary structures such as a guardrail at the upper part of the cross beam, a steel wire rope guide pipe and the like are mounted.

The combination of portal landing leg is the key of whole combination work, can use two base support flanges to carry out the preliminary assembling earlier on ground with the portal landing leg, then utilize the channel-section steel to connect two flanges fixed, guarantee that follow-up base flange mounting accuracy satisfies the bolt and wears to adorn the requirement, checks the straightness that hangs down of adjustment stand, the levelness and the interval of upper portion flange before the welding.

And after the 16 gantries are combined, the gantry crane is transported to a hoisting area below the heat collecting tower crane by using a flat car, and after the support flanges are qualified, the gantry crane is hoisted in place one by one, and all bolts are fastened. And after the completion, rechecking the installation sizes of all the door frames and the bolt torque, and applying for acceptance after the confirmation of no errors. In order to prevent the portal frame from swinging under the influence of wind power in the hoisting process, 16 portal frames are connected into a whole by using # 20I-steel after the portal frame is aligned, the connection mode adopts bolt connection, and the portal frame and the I-steel connecting lifting lug are processed and welded on the portal frame and the I-steel during ground combination.

(3) Introduction to Hydraulic lifting System

Steel strand wires jack device:

the steel strand jack device lifts or moves the structural weight by the increment of the hydraulic jack, and the increment of each time is equivalent to the stroke of the jack. The steel strand jack device is lifted or pulled through sequential extension or retraction of the jack piston.

The wedge clamping mechanism automatically locks the strand, the steel strand passes through the jack when the piston extends, and then the steel strand is locked at a new position when the piston retracts and resets. The lowering process is somewhat complicated and requires the incorporation of a secondary hydraulic system in the clamping mechanism to override their automatic operation. This allows the jack to be opened without lifting during the resetting process and allows the steel strand to pass through the lower handle when actually lowered. One special function common to all jacks is their fail-safe mechanism, which ensures that the load is automatically locked in the bottom anchor of the jack in the event of any hydraulic or electrical failure. This same feature also provides a facility for stopping the lifting operation and transferring the load from the hydraulic system to the mechanical means of the bottom anchor at any part of the jack stroke, thereby eliminating the need to hold the load on the hydraulic system for long periods of time. As an additional function, both the jack piston and the main anchor below the jack can be serviced with the jack system suspended, if desired. The distal ends of the lifting strands are secured using an anchor block having the same braking mechanism as used in the jack.

Hydraulic means of steel strand wires jack:

the hoist system will be operated by 4 electro-hydraulic systems mounted on top of the tower. The motor speed of the hydraulics can be modified by the control software to ensure that all units operate at the same speed. This enables the operating speeds of the jacks to be synchronised regardless of their relative loads. In addition to the primary hydraulic system, the hydraulic device is equipped with an auxiliary hydraulic system for operating the control jack gripping mechanism.

The hydraulic device can directly operate the set process, and can also perform actual steel strand tensioning operation through a remote controller. The monitoring system of the remote control computer can detect the operating power of the hydraulic device, the pressure of each jack and the system, and can also display the stroke data and graphic format of each jack, the state of the clamping mechanism and all information required for safe operation.

The hydraulic device receives information from the jack electronics and may display this information directly, in part, on the built-in control panel. While sending the information to the control computer. A signal cable connects the power pack to the control computer.

The central control system:

the hoisting is controlled by a remote control system directly connected with a cable. The system operates on a master/slave bus. The normal mode of operation of the entire system will be by remote control, i.e. the operator will only monitor the operation and all data from the jack will be displayed on the computer display screen. The automatic function can be overridden at any time (i.e., during device installation and commissioning) to make individual load adjustments, if desired.

The control system allows the load in any jack to be increased or decreased relative to the load in the remaining jacks.

The emergency stop button is installed on all major components in the system. These buttons are connected in series, so if any button is activated, the system will shut down and only the diagnostic and alternate functions can be manually restarted.

The control system uses computerized techniques to control and monitor the performance of the hoist system.

In order to make the displayed information easy to use on site, the maximum number of jacks displayed on each screen is limited to 20, but only 16 are displayed in this item. The load on the jack, the sum of the total loads of the 16 lifting systems, the sum of the total loads of each lifting system, the stroke of the jack, the sum of the total number of strokes to derive an approximate movement value, etc. are recorded in detail. To facilitate control of the normal operation of the hoist and monitoring functions, the control system may also be programmed to determine all the interaction between each jack and the oil pump according to the specific lifting device requirements.

In addition, there will be spare computers which have complete operating systems and which can be used as spare hosts or spare computers in the event of computer accidents

Steel strand wires braced system: the steel strand wires coming out of the jack in the lifting process are guided through a supporting box guide pipe arranged above the portal frame and then pass through a reserved opening on the working platform through a deflection pipe of a lifting frame in the landing leg of the gantry hanger frame, so that the steel strand wires are suspended along the outer side tower wall.

Fixing the anchor shell system: the connection between the collector and the crane system is accomplished by means of a stationary anchor housing. The connection with the heat collector will be accomplished through the bolt that matches with the existing 16 lugs.

The steel strand wires are mechanically braked by the aid of the clamping jaws installed in the jack, and when power failure occurs or a lifting device fails, the clamping jaws brake freely to prevent the heat collector from sliding downwards.

(4) Hydraulic lifting system installation

The heat collector hydraulic lifting system consists of 16 sets of hydraulic lifting devices and four control systems, each set of hydraulic device comprises 1 hydraulic lifting device and 12 steel strands, each set of control system consists of a computer and a monitoring system and is used for controlling and monitoring the performance of the lifting system, and each set of control system controls 4 hydraulic lifting devices;

the hydraulic lifting device is provided with a hydraulic jack and a steel strand in an open area on the ground, the steel strand is checked item by item according to a quality check list before being threaded, and the steel strand is threaded after the condition that no fault exists is confirmed. The steel strand penetrating method comprises the following steps: inserting the steel strand jack into the leading-out end of the steel strand roller, moving the steel strand roller by using a forklift until the length of the steel strand reaches 230m, then cutting off the steel strand, ensuring that the steel strand penetrating method of each jack is consistent, cleaning dust and oil stains on the surface of the steel strand before penetrating into a strand hole, checking the integrity of the steel strand, and making a check record. After 12 stranded wires are threaded, clamping jaws inside the jacks are used for fixing, one truck crane and two forklifts are used for transferring the assembled jacks and the steel stranded wires to the interior of a tower barrel, a tower top portal frame is installed and accepted, a building crane is used for lifting the assembled jacks and the steel stranded wires to a position in the tower, a connecting bolt is used for fixing a hydraulic device on a portal frame beam, and an operating system is fixed above a temporary operating platform.

4. Failure check of 1 hydraulic lifting device in heat collector hoisting

And (3) performing calculation analysis on the heat collector supporting steel structure in various hoisting states by adopting a limit state method, wherein the calculation content comprises the strength, rigidity and stability of main components.

In order to consider the most adverse situation, 1 hydraulic lifting device on the top of the heat collection tower fails, and the rest 15 hydraulic lifting devices work normally and the lifting height is 170 m; and calculating the position of the lifting point with the maximum stress.

Through the analysis, the strength, rigidity and stability of each main component of the supporting steel structure under each hoisting working condition can meet the requirements; the length and the jacking force are lifted by adopting a steel strand in the hoisting process; the original design of the bearing capacity of the default node in the calculation is fully considered, and the original design is carried out according to the design requirement strictly during field construction, so that the quality of welding and bolt connection is ensured to meet the relevant standard requirement.

5. Anti-collision device for hoisting heat collector

In order to prevent the heat collector from impacting the concrete tower in the hoisting process. 16 bumpers were mounted on the support arm.

(1) Collision avoidance device pattern

The anti-collision device structure is a steel bottom plate with a buffer made of Nylatron 703 XL. The nylon piece is fixed on the bottom plate by bolts, and the whole anti-collision device is fixed on the outer end face of the bottom cross beam of the heat collector by the bolts.

(2) Calculation check

The anti-collision device is designed to bear the maximum impact force of 60t in the right front direction or bear the maximum impact force of 30t in the side direction.

If only one anti-collision device impacts the concrete wall, the horizontal load is 3.5% of the weight of the heat collector, namely 63 t. The load may be absorbed by two frontal pads on one collision protection device:

the steel plate is made of Q345. The yield strength is 345/1.1=313MPa, bolt 10.9 grade. The liner is made of Nylatron 703 XL material with a yield strength of 67 MPa.

Calculations indicate that under a load, the structure has sufficient structural integrity to meet its intended purpose. Plastic deformation is not expected to occur in the collector and is far from the limit of plastic deformation.

6. Hoisting risk analysis

(1) In the process of hoisting in the tower body, the distance between the heat collector and the inner wall of the concrete tower can be changed due to the fact that the heat collector or the tower body is influenced by wind power to move transversely. Theoretically, the MSR may strike the inner wall of the tower due to the large lateral displacement caused by the movement of the tower or the heat collector or both. Further, the thermal expansion of the tower body may be superimposed with other movements (informally referred to as "banana effect"). This "banana effect" changes as the sun moves during the day, with the area facing the sun increasing and the area facing away from the sun decreasing, resulting in deformation of the tower body.

(2) When the collector is ready to be extended out of the tower, it is subject to wind loads and the collector may tilt. When the collector reaches the upper part of the tower, the collector can stay for a long time until the collector is formally put in place due to accidents occurring in the hoisting process, so that the probability of high wind (20 m/s) and 0.1g of horizontal acceleration is increased.

(3) In the hoisting process of the heat collector, hoisting equipment can be failed.

Possible failures include risk of computer failure, risk of hydraulic device failure, risk of power failure, risk of strand breakage of the steel wire rope, and risk of jaw failure.

(4) Insufficient night illumination when the heat collector is in place leads to the construction risk of misoperation.

7. Preventive measures for hoisting

(1) Measures taken for collision between heat collector and tower body caused by banana effect during hoisting in tower

When the heat collector is in a tower, in the hoisting process, the transverse displacement of the heat collector or the tower body is influenced by wind force, the distance between the heat collector and the inner wall of the concrete tower is possibly changed, so that the heat collector impacts the inner wall of the tower barrel, in order to avoid the damage of heat collector equipment caused by collision, a collision block is arranged at the rear end of a supporting beam at the bottom of the heat collector and is fixed by bolts, and the collision block is used for preventing the heat collector from impacting the inner wall of the concrete tower body; the collision block consists of a connecting steel plate and a rubber block and is fixed at the position of a connecting bolt hole of a steel beam and a supporting beam at the bottom of the heat collector by bolts. See figure 5 for details.

1 wireless monitoring instrument is respectively arranged above the tail ends of the 16 supporting beams, and a specially-assigned person is arranged to monitor and record the distance between each supporting beam of the heat collector and the inner wall of the tower and feed back the distance to a hoisting commander in time.

Parameters such as the load of the hoisting device, the stroke of the hydraulic jack and the like are carefully monitored in the hoisting process, and the parameters are timely adjusted when 16 hydraulic devices are out of synchronization.

Sensor patches are pasted above the heat collector device body in the hoisting process, the deformation condition of the device parts is monitored in real time, and the hoisting safety is ensured.

When the heat collector is lifted by 15-20m, the stroke of the hydraulic lifting device is reset by using the computer control system, and the stroke error of each hydraulic lifting device cannot exceed 5%.

(2) Wind load prevention measure after heat collector is taken out of tower

The wind area of the heat collector is about 21 × 35=735 square meters, and the shape resistance coefficient is 1.3:

assuming that the maximum allowable wind speed at the upper part of the tower is 16m/s, the basic wind pressure is as follows:

Pw=C²/16=16kgf/m²

the total wind power for the maximum allowable wind speed is therefore:

H_1d=0.0016*1.3*735=5.97t

considering the self weight of the heat collector and the supporting arm to be about 1686mt, the transverse movement of the heat collector is/10780 =5.97/1686, =98 mm; the distance between the heat collector and the inner wall of the tower body is 100mm, and according to the calculation, the maximum allowable wind speed is 16m/s when the heat collector is ready to extend out of the tower body.

When the heat collector reaches the upper part of the tower, the heat collector possibly stays for a long time until the heat collector is formally put in place due to accidents occurring in the hoisting process, the probability that the strong wind (20 m/s) and the horizontal acceleration are 0.1g is increased, in order to ensure the hoisting safety of the heat collector, the heat collector needs to be reinforced, each support leg is bound on a portal frame base by two 20t tensioners, and the minimum load of an 8.5t clamp ring is as follows: 8.5t × 6=51t

(3) In the hoisting process of the heat collector, the hoisting equipment may be out of order and measures are taken

Risk of computer failure. The standby computer is arranged on site, and the stranded wire jack can be freely braked in a safe mode, so that the computer can be directly replaced, and the hoisting safety is not influenced.

Failure of the hydraulic device: the site is equipped with a complete set of hydraulic equipment spare parts, and when the stranded wire jack is freely braked in a safe mode, an engineer can quickly repair the stranded wire jack.

Power outage risk: the steel strand jack can freely brake in the safe mode, and electricians can emergently repair or replace the standby generator for the power supply equipment.

Risk of strand breakage of the steel wire rope: each steel strand jack is provided with 12 strands of steel strands, the load of each strand of steel wire rope is 81.75KN according to calculation, the breaking tension of the steel wire rope is 380.14KN, and the safety factor is 4.65, so the strand breaking condition basically cannot occur. And the hoisting steel strand is used in a brand-new and same batch, and the material and load test of the steel strand can be checked before the hoisting steel strand is threaded.

Risk of jaw failure: the group of steel stranded wires comprises 12 strands, each of the 12 strands is provided with a clamping jaw, each strand of steel stranded wire is provided with a separate clamping jaw, and a manufacturer provides a file for proving the use times and the service life of the clamping jaws; sand or rust deposited on the steel strand in the jack cylinder can reduce the clamping effect of the clamping mechanism on the steel strand, and a conventional maintenance plan needs to be arranged or the jaw plate needs to be replaced.

Long-term experience with steel strands in typical environments shows that a loss of grip occurs after about 500 clamps. If the cylinder stroke of the L180 steel strand jack is 400/450mm and the effective average stroke is 300mm in the operation process from the safety point of view, the wedge block is replaced after the heat collector is raised by 110-150 m. The wedge block is replaced at a specific time by operators and commands according to a hoisting schedule, so that the replacement time is reasonably arranged.

(4) The heat collector is in place, the construction risk is carried out at night, when the heat collector is hoisted to the in-place position, the supporting beam is pushed into the groove of the tower body foundation, the gap between the two sides of the supporting beam and the foundation is only 100mm, the requirement on light is high, when the heat collector reaches the installation position, enough illumination is installed at the bottom of the heat collector tower, and a generator is arranged for standby.

During the hoisting process, the following points are mainly noted:

1. inspection before hoisting

(1) All checking tables should be filled completely and signed (including performance test reports of hydraulic lifting devices, steel strand materials, delivery certification documents, service life certification of jaws and the like);

(2) all parts of the equipment are reliably connected;

(3) equipment and accessory supporting structures are ready to be hoisted;

(4) all the persons participating in hoisting are in place;

(5) before hoisting is started, the operation area should be obviously warned, and all irrelevant personnel cannot enter the operation area;

(6) checking the wireless communication system to work correctly;

(7) all hoisting operators should be familiar with hoisting procedures and field safety measures;

(8) before all the devices are used, checking according to the check list and making relevant records;

(9) keeping all the equipment clean and in a normal working condition;

(10) other operations cannot be simultaneously carried out in the hoisting area, so that the hoisting operation is not interfered;

(11) all loose components should be removed and all movable parts should be fixed;

(12) the weather forecast information is effective and meets the hoisting requirement; note: weather forecast information should be obtained from qualified interested parties.

(13) And carrying out detailed related operation and flow intersection on operators and constructors before hoisting is started. All the persons participating in the hoisting operation should know the organization, rules, responsibilities and communication plan of the hoisting operation.

2. Heat collector hoisting

(1) Formal hoisting preload test of heat collector

The supporting ring beam and the heat collector are supported by a sliding track;

the hoisting device is enabled to bear 10% of the expected load, and the performance of each part of the hoisting device is checked;

lifting 1.2 times of the predicted load by using 8 alternative lifting devices for 20 minutes, and checking the integrity of each part of the 8 lifting devices under the load of 1.2 times;

releasing the load of 8 hoisting devices, and then repeating the operation by using the other 8 hoisting devices;

when the load is released to 10% again, loosening the bolts between the supporting ring beam and the heat collector;

the load is lifted stepwise using a lifting device, each step lifting 10% of the expected load. Checking deformation conditions of all parts of the lifting device and making relevant records when the load is lifted by 10%; until the heat collector is completely supported by the hoisting device;

the skid unloads the load to 0. Removing connecting bolts between the supporting ring beam and the bottom of the steel structure of the heat collector;

after the load test is completed, the hoisting system is finally inspected before hoisting. And (4) connecting the inspection stranding, the stranded hose, the PPU connection, the anchor shell, the heat collector lifting lug and the anchor of the steel strand. If the loose strand is found, the fixing should be firm before hoisting.

(2) Bottom support ring beam shifting out and fixed anchor block mounting before heat collector hoisting

When the heat collector is hoisted to the height of 5-8m, stopping hoisting, replacing the installation direction after the sliding shoe push-pull device is removed, and pushing the support ring beam out of the tower body;

installing a push-pull device; the push-pull device consists of a slide rail, a bracket and a hydraulic jack and is arranged below a supporting beam at the bottom of the heat collector; the sliding rail is welded on a supporting beam at the bottom of the heat collector in a heat collector combined field, the bracket is connected below the sliding rail by using a bolt, and the tray can slide under the action of the hydraulic jack;

and (3) mounting a fixed anchor block: the fixed anchor block consists of two cross beams, namely an upper fixed anchor block and a lower fixed anchor block; the middle of the upper fixing anchor block and the middle of the lower fixing anchor block are connected into a whole by a screw rod of M64, and the upper and lower spacing of the upper fixing anchor block and the lower fixing anchor block is 2450 mm. After the fixed anchor block is combined on the ground, the total weight is 2.7t, the fixed anchor block is transported to the position right below the installation position by using a 5t forklift and lifted, the fixed anchor block is lifted to the in-place position by using a 3t chain hoist, a constructor stands on a rod lifting vehicle in the tower, and the fixed anchor block is fixed on a push-pull device bracket by using a bolt M30;

erecting a scaffold operation platform at the bottom of the heat collector: when the heat collector reaches the in-position, a constructor needs to operate the fixed anchor block sliding, the fixed anchor block adjusting and the like at the lower part of the heat collector, so that a double-layer scaffold hanger platform with the diameter of 23m and the height of 3.5m is erected after a supporting beam at the bottom of the heat collector is installed, and the platform cannot influence the propulsion of the fixed anchor block. And the scaffold platform is dismantled after the 213m formal platform in the tower is in place.

(3) Heat collector hoisting

After the command sends out the instruction of starting lifting, the heat collector starts lifting operation at the average speed of 6 m/h. The collectors will be lifted on day 1 and day 2 until a height of 100 to 150 meters is reached. During this time, the crane inspector inspected the twister jaws and, if abnormal, replaced on day 3. The twister is disassembled by a professional. After lifting the head of the jack, a worker applies lubricating oil on the jaw. The jaw is changed by the professional, and the strange awl cannot be touched by others. After the jaw is replaced, the lifting activity will continue.

Reaching the final position of the top of the tower within two days in the future. The hoisting operation will be completed within 5 days, including the replacement of the cone.

In the whole hoisting process, the operation personnel can properly clean the tower top. And check if the hose is leaking. If any leaks are found, the hoisting conductor should be notified immediately. After inspection, the lifting operation is stopped by fixing the load on the winch and the leak is handled by a professional.

(4) Mounting of heat collector fixing anchor block

Operating the push-pull device to push the fixed anchor block into the groove of the tower body; after the fixed anchor block is pushed to enter the installation position, an adjusting gasket is added to the bottom of the installation position of the upper fixed anchor block, battens are padded to the bottom of the lower fixed anchor block, and the battens are locked through adjusting connecting bolts. After stress, a concave steel box is arranged below the lower fixed anchor block and used for installing a jack of the jacking supporting beam. And jacking the jack to ensure that the jacking is stopped when the top surface elevation of the upper supporting beam is 17mm lower than the top of the concrete of the heat collection tower.

Check that all systems are stressed and stable. And removing the pushing system beside the fixed anchor block, removing the screw cap and the gasket on the upper part of the fixed anchor block, slowly dropping the whole heat collector, and penetrating the M64 screw into the mounting position of the steel beam at the bottom of the heat collector until the steel beam at the bottom of the heat collector is consistent with the elevation of the tower top. At the moment, the gap between the upper surface of the fixed anchor block and the steel beam at the bottom of the heat collector is 17 mm.

The chain hoist is used for integrally lifting the fixed anchor block, the upper fixed anchor block and a heat collector bottom steel beam connecting bolt are penetrated simultaneously, the part of bolts are fastened, and the gap between the bottom sliding support and the concrete surface is 27 mm.

And adjusting the left and right buffer gaskets of the fixed anchor block to ensure that no gap exists between the buffer gaskets and the concrete. The gap can be adjusted by using an adjusting shim in the process.

The sliding support is subjected to secondary grouting, and the maintenance strength meets the requirement. Two ultrathin hydraulic oil jacks and a chain hoist are arranged at the bottom of the lower fixed anchor block, and the lower fixed anchor block is lifted to a mounting position. And simultaneously, fastening the M64 connecting screw. And (5) removing the oil top and the chain block.

After the heat collector is in place and the foundation has the bearing condition, the hoisting device starts to unload, the hydraulic device gradually unloads according to 20% of load each time, the deformation condition of the foundation and the fixed anchor block is checked after each unloading, after no obvious deformation is checked, the hoisting device continues to unload until the load of the hoisting device is 0, and the heat collector completely bears the weight on the foundation.

Dismantling a heat collector hoisting device: loosening steel strands of the hoisting device, removing pin shafts between the steel strands and the lifting lugs, binding the steel strands extending out of the jack by using a tower crane, removing 5 steel strands each time, cutting the steel strands, and slowly placing the steel strands at zero meter through a preformed hole of the tower top operating platform; and loosening the connecting bolt of the jack and the portal, and hoisting the hydraulic device and the rest small part of steel strands by using the tower crane to place the zero-meter ground outside the tower.

The above listed embodiments are only for clear and complete description of the technical solution of the present invention with reference to the accompanying drawings; it should be understood that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments, and the terms such as "upper", "lower", "front", "back", "middle", etc. used in this specification are for clarity of description only, and are not intended to limit the scope of the invention, which can be implemented, and the changes or modifications of the relative relationship thereof are also regarded as the scope of the invention without substantial technical changes. Meanwhile, the structures, the proportions, the sizes, and the like shown in the drawings are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the conditions under which the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, changes in proportion relation, or adjustments of the sizes, can still fall within the range covered by the technical contents disclosed in the present invention without affecting the effects and the achievable purposes of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. A method for hoisting a megawatt tower type heat collector by using a hoisting portal is characterized by comprising the following steps: firstly, a heat absorption tower is arranged on the ground at the position where the tower type photo-thermal power generation heat collector is arranged, and an internal space for hoisting the tower type photo-thermal power generation heat collector is reserved in the heat absorption tower according to the size of the tower type photo-thermal power generation heat collector; and then, hoisting the megawatt tower type photo-thermal power generation heat collector integrally from the bottom inside the heat absorption tower to the top of the heat absorption tower by using a portal frame and a hydraulic crane from the top of the heat absorption tower by utilizing the space in the heat absorption tower, and then integrally installing and positioning.

2. The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 1, wherein the method comprises the following steps: the internal space reserved in the heat absorption tower for hoisting the tower type photo-thermal power generation heat collector is of a hollow heat absorption tower structure according to the size of the tower type photo-thermal power generation heat collector, and a hollow area matched with the diameter of the tower type photo-thermal power generation heat collector is reserved in the heat absorption tower so that the tower type photo-thermal power generation heat collector is hoisted to the top of the heat absorption tower from the bottom integrally; and an access door for the tower-type photo-thermal power generation heat collector to enter and exit is reserved on the side surface of the heat absorption tower, so that the tower-type photo-thermal power generation heat collector integrally slides to the center inside the heat absorption tower.

3. The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 1, wherein the method comprises the following steps: the whole tower type photo-thermal power generation heat collector is hoisted to the top of the heat absorption tower from the bottom of the heat absorption tower by adopting the portal frame and the hydraulic crane from the top of the heat absorption tower, a plurality of portal frames are arranged on the top of the heat absorption tower around the circumference of the top of the heat absorption tower, the hydraulic crane is installed on the portal frame, each set of hydraulic crane discharges steel strands from the tower, the steel strands of each set of hydraulic crane are respectively connected with steel beam lifting lugs at the bottom of the heat collector by using anchors and pin shafts, the hydraulic cranes on the plurality of portal frames are arranged on the circumference to run synchronously, and the whole tower type photo-thermal power generation heat collector is hoisted to the top.

4. The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 3, wherein the method comprises the following steps: the synchronous operation of the hydraulic cranes is that a plurality of hydraulic cranes lift or move structural weights through the increment of the hydraulic steel strand jacks, and the increment of each time is equivalent to the stroke of the hydraulic steel strand jacks; the hydraulic steel strand jack is lifted or pulled by the jack pistons to extend or retract in sequence to realize the integral lifting of the tower type photo-thermal power generation heat collector.

5. The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 3, wherein the method comprises the following steps: the synchronous operation of the hydraulic cranes is that a plurality of hydraulic cranes lift or move structural weights through the increment of the hydraulic steel strand jacks, and the increment of each time is equivalent to the stroke of the hydraulic steel strand jacks; the plurality of door frames are connected into a whole through I-shaped steel and fasteners at the top of the heat absorption tower, so that the door frames are prevented from swinging under the influence of wind power in the hoisting process; the hydraulic steel strand jack is lifted or pulled by sequentially extending or retracting a jack piston to realize the integral lifting of the tower type photo-thermal power generation heat collector; the hydraulic steel strand jack is provided with a wedge-shaped clamping mechanism, the wedge-shaped clamping mechanism automatically locks the steel strand, the steel strand passes through the jack when the piston extends out, and then the steel strand is locked at a new position when the piston retracts and resets.

6. The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 3, wherein the method comprises the following steps: the lower end of the hydraulic steel strand is connected with a lifting lug, and the lifting lug is connected with the tower type photo-thermal power generation heat collector through a bottom supporting beam of the heat collector; on one hand, the bottom supporting beam of the heat collector is connected to the bottom of the tower type solar-thermal power generation heat collector through a fastener, and plays a supporting role in supporting the tower type solar-thermal power generation heat collector; on the other hand, a hoisting block integrally connected with the bottom supporting beam of the heat collector protrudes upwards from the outer end part of the bottom supporting beam of the heat collector, and a bolt matched with the lifting lug is arranged on the hoisting block; during hoisting, the lifting lug falls into the hoisting block and is inserted into the lifting lug through a bolt on the hoisting block to form connection with the lifting lug.

7. The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 6, wherein the method comprises the following steps: in order to avoid damage to heat collector equipment caused by collision during hoisting, an anti-collision block is arranged at the outer end part of a bottom supporting beam of the heat collector and is fixed at the outer end part of the bottom supporting beam of the heat collector by using bolts, and the anti-collision block is used for preventing the heat collector from colliding with the inner wall of a concrete tower body; the anti-collision block consists of a connecting steel plate and a rubber block and is fixed on the outer end part of the bottom supporting beam of the heat collector by bolts.

8. The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 1, wherein the method comprises the following steps: the integral installation and positioning is that a fixed anchor is connected below a supporting beam at the bottom of the heat collector, and the fixed anchor is moved into a groove in the wall of the top of the heat absorption tower through a moving device after the tower-type solar-thermal power generation heat collector is hoisted to the top, and is locked and fixed.

9. A hoisting system for hoisting a megawatt tower type heat collector by utilizing hoisting gantries comprises a heat absorption tower, a plurality of gantries, a hydraulic crane, a heat collector bottom supporting beam and a lifting lug; the portal frame is arranged at the top of the heat absorption tower, the hydraulic crane is arranged on the portal frame and is provided with a hydraulic steel strand jack, and the hydraulic steel strand jack is connected with the lifting lug through a steel strand; a plurality of gantries provided with hydraulic cranes are combined to form a hoisting system of the tower type photo-thermal power generation heat collector, and the hydraulic steel strand jacks of the hydraulic cranes are matched with the bottom supporting beams and the lifting lugs of the heat collector to hoist the whole tower type photo-thermal power generation heat collector to the top of a heat absorption tower from the inner space of the heat absorption tower.

10. The method for hoisting the megawatt tower collector by using the hoisting portal according to claim 9, wherein the method comprises the following steps: the plurality of door frames are connected into a whole through I-shaped steel and fasteners at the top of the heat absorption tower, so that the door frames are prevented from swinging under the influence of wind power in the hoisting process; the hydraulic steel strand jack is lifted or pulled by sequentially extending or retracting a jack piston; the hydraulic steel strand jack is provided with a wedge-shaped clamping mechanism, the wedge-shaped clamping mechanism automatically locks the steel strand, the steel strand passes through the jack when the piston extends out, and then the steel strand is locked at a new position when the piston retracts and resets; the lower end of the hydraulic steel strand is connected with a lifting lug, and the lifting lug is connected with the tower type photo-thermal power generation heat collector through a bottom supporting beam of the heat collector; on one hand, the bottom supporting beam of the heat collector is connected to the bottom of the tower type solar-thermal power generation heat collector through a fastener, and plays a supporting role in supporting the tower type solar-thermal power generation heat collector; on the other hand, a hoisting block integrally connected with the bottom supporting beam of the heat collector protrudes upwards from the outer end part of the bottom supporting beam of the heat collector, and a bolt matched with the lifting lug is arranged on the hoisting block; during hoisting, the lifting lugs fall into the hoisting blocks, are inserted into the lifting lugs through the bolts on the hoisting blocks and are connected with the lifting lugs; in order to avoid damage to heat collector equipment caused by collision during hoisting, an anti-collision block is arranged at the outer end part of a bottom supporting beam of the heat collector and is fixed at the outer end part of the bottom supporting beam of the heat collector by using bolts, and the anti-collision block is used for preventing the heat collector from colliding with the inner wall of a concrete tower body; the anti-collision block consists of a connecting steel plate and a rubber block and is fixed on the outer end part of the bottom supporting beam of the heat collector by bolts; the fixing anchor is connected below the supporting cross beam at the bottom of the heat collector, and after the tower type solar-thermal power generation heat collector is hoisted to the top, the fixing anchor moves into a groove in the wall of the cylinder at the top of the heat absorption tower through the moving device and is locked and fixed.