CN108439185A - A kind of hanging method that tower heavy type is covered greatly - Google Patents
A kind of hanging method that tower heavy type is covered greatly Download PDFInfo
- Publication number
- CN108439185A CN108439185A CN201810441319.6A CN201810441319A CN108439185A CN 108439185 A CN108439185 A CN 108439185A CN 201810441319 A CN201810441319 A CN 201810441319A CN 108439185 A CN108439185 A CN 108439185A
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- China
- Prior art keywords
- jackscrew
- group
- wire rope
- steel wire
- big lid
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Revetment (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
A kind of hanging ring hanging method that tower heavy type is covered greatly, including step：Remove nut；4 pieces of filling pads I are made with 12mm steel plates, 56 pieces of filling pads II are made with 1mm thickness stainless steel plates：Big lid is jacked up with jackscrew；Gasket I, II is divided into four groups；Non- U-type groove end of the gasket I with II will be corresponded to securely to tie up, form first to fourth gasket group；First to fourth gasket group is placed between big lid and cylinder in gap；Connection bolt is removed near damage peg hanging ring, exposes bolt hole；It is symmetrically hung on two intact peg hanging rings with two chain blocks；Perforation binding steel wire rope both ends are penetrated into bolt hole, two end noses are buckled together；Steel wire rope doubling is hung on perforation binding steel wire rope；Chain block and steel wire rope are hung on suspension hook, big lid is promoted；Big lid is placed on the sleeper of ground；Maintenance finishes, and returns the big lid of dress.The present invention is easy to operate, and safe, the devoid of risk of safety can ensure being smoothed out for service work, not influence maintenance duration.
Description
Technical field
The present invention relates to the dismounting of ammonia convertor, installing areas, more specifically, it is related to a kind of work as mounted on big lid
After peg hanging ring damage on (headkerchief), hanging method that tower heavy type is covered greatly.
Background technology
For high temperature, high pressure, special media ammonia convertor for, big lid is the important composition component of synthetic tower, is being closed
It is indispensable step at the dismounting and installation in tower installation or maintenance process, covered greatly.The big lid of synthetic tower is very thick and heavy, gently
20 tons or so of person, 40 tons or so of severe one.The lifting covered greatly is that the 4 peg hanging rings installed by its top are sling, if closed
It is used for a long time at tower, it is easy to cause peg hanging ring burn into damage, once peg hanging ring damages, the lifting covered greatly will become
One problem.
Traditional hanging method is usually lifted by crane using 4 peg hanging rings, must be to it again if peg hanging ring damages
Customization, and the period for customizing peg hanging ring again is longer, generally at 15~30 days or so, has seriously affected the check man of synthetic tower
Make.
Invention content
The technical problem to be solved by the present invention is to provide a kind of hanging method that tower heavy type is covered greatly, easy to operate, peace
Complete safe, devoid of risk, can ensure being smoothed out for service work, not influence maintenance duration.
Technical solution of the invention is to provide a kind of hanging ring hanging method that tower heavy type is covered greatly, including walks as follows
Suddenly：
1) all M105 nuts covered greatly are removed；
2) the jackscrew filling pad I of 4 pieces of 150 × 100mm of steel plate making of 12mm thickness is used, then with the stainless steel plate system of 1mm thickness
Make the jackscrew filling pad II of 56 pieces of 150 × 100mm：
3) slowly rotation will cover greatly upward jack-up uniformly mounted on 4 jackscrews of the borders great Gai；
4) 4 pieces of jackscrew filling pads I and 56 pieces of jackscrew filling pads II are respectively classified into four groups；
5) by the non-U-type groove end glue at the non-U-type groove end of first group of jackscrew filling pad I and first group of jackscrew filling pad II
Band securely bands together, and the first gasket group is formed, by the non-U-type groove end of second group of jackscrew filling pad I and second group of jackscrew U
The non-U-type groove end of type gasket II is securely banded together with adhesive tape, the second gasket group is formed, by third group jackscrew filling pad I
Non- U-type groove end and the non-U-type groove end of third group jackscrew filling pad II are securely banded together with adhesive tape, form third gasket group,
The non-U-type groove end of 4th group of jackscrew filling pad I and the non-U-type groove end of the 4th 1 group of jackscrew filling pad II are securely tied with adhesive tape
It binds together, forms the 4th gasket group；
6) first to fourth gasket group is placed in the gap formed between big lid and cylinder, and first to fourth is padded
The U-type groove of piece group is stuck on the body of rod of 4 jackscrews, ensures the jackscrew filling pad I of 12mm thickness herein downward；
7) the connection bolt that two M105 are removed near the peg hanging ring of damage, exposes two bolts hole；
8) it is symmetrically hung on two intact peg hanging rings with two 10 tons of chain block；
9) it uses the steel wire rope of 6 × 37+1-1700 diameter phis 20mm to bundle steel wire rope as perforation, perforation is bundled
The both ends of steel wire rope penetrate two bolts hole, and two end nose is pulled out upwards from bolt hole lower part, outside excessive lid
Wall returns in big hd top face, is buckled together two end noses with 10 tons of snap rings；
10) two strands are folded in half into the steel wire rope of 6 × 37+1-1700 diameter phis 28mm, hang over perforation binding steel wire rope
On, two strands are folded in half into using same steel wire rope hung with perforation binding steel wire rope on symmetrical peg hanging ring；
11) steel wire rope of two good 10 tons of chain blocks of bolt and two 6 × 37+1-1700 diameter phis 28mm is hung over
On the pulley blocks of hoist engine or the suspension hook of crane, big lid is slowly promoted；
12) when the hoisting depth in big base face is more than the top surface 50mm of M105 connection bolts, mobile pulley group driving or
Crane leaves tower top, then slowly falls, and Jiang great Gai is placed on the sleeper on ground；
13) after waiting for tower maintenance, the big lid of dress is returned, 4 jackscrews are rotated down, expose big base face 28mm, then
Retract 3mm, it is ensured that 4 jackscrews are exposed independent from big base face 25mm；
14) again by 6 × 37+1-1700 diameter phis of bolt good two 10 tons of bottle gouards moved by hands and two two strands of doublings
The steel wire rope of 28mm is hung on the pulley blocks of hoist engine or the suspension hook of crane, slowly promotes big lid upwards；
15) when the hoisting depth in big base face is more than the top surface 50mm of M105 connection bolts, stop being promoted, mobile pulley
Group driving or crane, Jiang great Gai are moved on to right over cylinder；
16) start hoist engine or crane, slowly fall big lid, and Jiang great Gai is placed on the first to fourth gasket group of 26mm high
On；
17) it is firm, firm to check whether first to fourth gasket group pads, checks whether perforation binding steel wire rope is crushed to death；
18) extraction perforation binding steel wire rope；
19) 4 jackscrews are rotated, big caping is played into 1mm, adhesive tape is torn off, is respectively extracted out at the top of first to fourth gasket group
The jackscrew filling pad II of two panels 1mm, subsequent negative direction rotate jackscrew, make to cover decline 1mm greatly, again by first to fourth gasket
The jackscrew filling pad II at group top extracts two panels out, and so on operates, until all jackscrew filling pads are completely drawn out, it is big to cover
It is completely in place；
20) after tower is run 72 hours, chain block, pulley blocks is removed, hoist engine or crane, site clearing are removed.
A kind of hanging method that tower heavy type is covered greatly of the present invention, wherein the perforation binding steel wire rope and great Gai
Edge corner angle are in contact position equipped with simmering and bending iron sheet or rubber slab.
After using the above structure, compared with prior art, a kind of hanging method that tower heavy type is covered greatly of the present invention have with
Lower advantage：
1, easy to operate, safe, the devoid of risk of safety can ensure being smoothed out for service work；
2, efficiently, rapid, not influence duration, dismounting simple；
3, input cost is low, and economy consumption reduction, jackscrew filling pad I, II makes simply, easy to use；
4, it is applicable not only to peg hanging ring four and lacks one (i.e. in four peg hanging rings, there are one damages), while being also suitable bolt
Nail hanging ring four lacks the lifting to covering greatly in the case of two, four scarce three, four scarce four.
Description of the drawings
Fig. 1 is that big lid, peg hanging ring, jackscrew, M105 nuts connect plan structure when being bolted together with M105
Schematic diagram；
Fig. 2 is that cylinder, great Gai, peg hanging ring, jackscrew, M105 nuts connect main view when being bolted together with M105
Broken section structural schematic diagram；
Fig. 3 is dimensional structure diagram when being lifted using the present invention to covering greatly；
Fig. 4 is main view broken section enlarged structure schematic diagram when the first gasket group is caught on the jackscrew body of rod；
Fig. 5 is that the first gasket group is caught in local overlooking enlarged structure schematic diagram when on the jackscrew body of rod.
Specific implementation mode
With reference to the accompanying drawings and detailed description to a kind of hanging ring hanging method that tower heavy type is covered greatly of the present invention make into
One step is described in detail：
A kind of hanging ring hanging method that tower heavy type is covered greatly, includes the following steps：
1) referring to Fig. 1, all M105 nuts 11 on big lid 12 are removed；
2) see Fig. 4, make the jackscrew filling pad I 241 of 4 pieces of 150 × 100mm of the steel plate of 12mm thickness, then with 1mm thickness
Stainless steel plate makes the jackscrew filling pad II 242 of 56 pieces of 150 × 100mm：
3) see Fig. 1 and 2, slowly rotate 4 jackscrews 14 for being uniformly mounted on 12 border of big lid, big lid 12 is jacked up upwards；
4) 4 pieces of jackscrew filling pads I 241 are divided into four groups, every group one piece；56 pieces of jackscrew filling pads II 242 are divided into four
Group, every group 14 pieces；
5) by the non-U-type groove at the non-U-type groove end and first group of jackscrew filling pad II 242 of first group of jackscrew filling pad I 241
End is securely banded together with adhesive tape, forms the first gasket group 24；By the non-U-type groove end of second group of jackscrew filling pad I 241 with
The non-U-type groove end of second group of jackscrew filling pad II 242 is securely banded together with adhesive tape, forms the second gasket group；By third group
The non-U-type groove end of jackscrew filling pad I 241 and the non-U-type groove end of third group jackscrew filling pad II 242 are securely banded in adhesive tape
Together, third gasket group is formed；By the non-U-type groove end of the 4th group of jackscrew filling pad I 241 and the 4th 1 group of jackscrew filling pad II
242 non-U-type groove end is securely banded together with adhesive tape, forms the 4th gasket group；The effect of adhesive tape is to prevent each gasket group
Be scattered；
6) see Figure 4 and 5, first to fourth gasket group is placed in the gap formed between big lid 12 and cylinder 15, and
The U-type groove of first to fourth gasket group is stuck on the body of rod of 4 jackscrews 14, ensures the U-shaped pad of jackscrew of 12mm thickness herein
Piece I 241 is downward；
7) see Fig. 1 and 3, the connection bolt 10 of two M105 is removed near the peg hanging ring of damage, expose two bolts
Hole 16；
8) see Fig. 3, symmetrically hung on two intact peg hanging rings 13 with two 10 tons of chain blocks 21, for covering greatly
12 horizontal adjustment；
9) see Fig. 3, the steel wire rope of 6 × 37+1-1700 diameter phis 20mm is used to bundle steel wire rope 23 as perforation, it will
The both ends of perforation binding steel wire rope 23 penetrate two bolts hole 16, and two end nose is pulled up from 16 lower part of bolt hole
Go out, returns in big hd top face around excessive cover outer wall, be buckled together two end noses with 10 tons of snap rings；
10) two strands are folded in half into the steel wire rope of 6 × 37+1-1700 diameter phis 28mm, hang over perforation binding steel wire rope
On 23, two strands are folded in half into using same steel wire rope on symmetrical peg hanging ring with perforation binding steel wire rope 23 and are hung；
11) steel wire rope of two good 10 tons of chain blocks 21 of bolt and two 6 × 37+1-1700 diameter phis 28mm are hung
On the pulley blocks of hoist engine or the suspension hook 20 of crane, big lid 12 is slowly promoted；
12) when the hoisting depth of 12 bottom surface of big lid is more than the top surface 50mm of M105 connections bolt 10, mobile pulley group row
Vehicle or crane leave tower top, then slowly fall, and big lid 12 is placed on the sleeper on ground；
13) it after waiting for tower maintenance, returns and fills big lid 12,4 jackscrews 14 are rotated down, confirmation can not rotate still further below
Afterwards, expose 12 bottom surface 28mm of big lid (range of jackscrew), then retract 3mm, it is ensured that 4 jackscrews 14 are exposed independent from big base face
25mm；
14) again by 6 × 37+1-1700 diameter phis of bolt good two 10 tons of bottle gouards moved by hands and two two strands of doublings
The steel wire rope of 28mm is hung on the pulley blocks of hoist engine or the suspension hook 20 of crane, slowly promotes big lid 12 upwards；
15) when the hoisting depth of 12 bottom surface of big lid is more than the top surface 50mm of M105 connections bolt 10, stop being promoted, it is mobile
Pulley blocks are driven a vehicle or crane, and big lid 12 is moved on to right over cylinder 15；
16) start hoist engine or crane, slowly fall big lid 12, and big lid 12 is placed on to first to fourth pad of 26mm high
In piece group；
17) it is firm, firm to check whether first to fourth gasket group pads, checks whether perforation binding steel wire rope 23 is crushed to death；
18) extraction perforation binding steel wire rope 23；
19) 4 jackscrews 14 are rotated, big lid 12 is jacked up into 1mm, tear adhesive tape off, it is each at the top of first to fourth gasket group
Extract the jackscrew filling pad II 242 of two panels 1mm out, subsequent negative direction rotates jackscrew 14, so that big lid 12 is declined 1mm, again by first
Jackscrew filling pad II 242 at the top of to the 4th gasket group extracts two panels out, and so on operates, until by all jackscrew filling pads
It is completely drawn out, big lid 12 is completely in place；
20) after tower is run 72 hours, chain block 21, pulley blocks are removed, remove hoist engine or crane, cleaning is existing
.
Perforation binding steel wire rope 23 is in contact position with 12 edge corner angle of big lid equipped with simmering and bending iron sheet or rubber slab, can be to wearing
Hole binding steel wire rope 23 is protected, and prevents steel wire rope impaired.
The present invention is easy to operate, and safe, the devoid of risk of safety can ensure being smoothed out for service work；Efficiently, rapidly,
Duration, dismounting are not influenced simply；Input cost is low, and economy consumption reduction, jackscrew filling pad I, II makes simply, easy to use；Not only
One (i.e. four peg hanging rings, there are one damages) is lacked suitable for peg hanging ring four, while being also suitable peg hanging ring four and lacking two, four
Lack the lifting to covering greatly in the case of three, four scarce four.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made, should all fall within the scope of protection of the present invention.
Claims (2)
1. a kind of hanging ring hanging method that tower heavy type is covered greatly, which is characterized in that include the following steps：
1) all M105 nuts (11) on big lid (12) are removed；
2) steel plate of 12mm thickness is used to make the jackscrew filling pad I (241) of 4 pieces of 150 × 100mm, then the stainless steel plate with 1mm thickness
Make the jackscrew filling pad II (242) of 56 pieces of 150 × 100mm：
3) slowly rotation is uniformly mounted on big 4 jackscrews (14) for covering (12) border, and Jiang great Gai (12) is jacked up upwards；
4) 4 pieces of jackscrew filling pads I (241) and 56 pieces of jackscrew filling pads II (242) are respectively classified into four groups；
5) by the non-U-type groove at the non-U-type groove end and first group of jackscrew filling pad II (242) of first group of jackscrew filling pad I (241)
End is securely banded together with adhesive tape, the first gasket group (24) is formed, by the non-U-type groove of second group of jackscrew filling pad I (241)
It holds the non-U-type groove end with second group of jackscrew filling pad II (242) securely to be banded together with adhesive tape, forms the second gasket group, it will
The non-U-type groove end of third group jackscrew filling pad I (241) and the non-U-type groove end adhesive tape of third group jackscrew filling pad II (242)
It securely bands together, third gasket group is formed, by the non-U-type groove end of the 4th group of jackscrew filling pad I (241) and the 4th 1 group
The non-U-type groove end of jackscrew filling pad II (242) is securely banded together with adhesive tape, forms the 4th gasket group；
6) first to fourth gasket group is placed in the gap formed between big lid (12) and cylinder (15), and by first to the
The U-type groove of four gasket groups is stuck on the body of rod of 4 jackscrews (14), ensures the jackscrew filling pad I of 12mm thickness herein downward；
7) the connection bolt (10) that two M105 are removed near the peg hanging ring of damage, exposes two bolts hole (16)；
8) it is symmetrically hung on two intact peg hanging rings (13) with two 10 tons of chain block (21)；
9) it uses the steel wire rope of 6 × 37+1-1700 diameter phis 20mm as perforation binding steel wire rope (23), perforation is bundled
The both ends of steel wire rope (23) penetrate two bolts hole (16), and two end nose is pulled up from bolt hole (16) lower part
Go out, returns in big hd top face around excessive cover outer wall, be buckled together two end noses with 10 tons of snap rings；
10) two strands are folded in half into the steel wire rope of 6 × 37+1-1700 diameter phis 28mm, hang over perforation binding steel wire rope (23)
On, two strands are folded in half into using same steel wire rope hung with perforation binding steel wire rope (23) on symmetrical peg hanging ring；
11) steel wire rope of two good 10 tons of chain blocks (21) of bolt and two 6 × 37+1-1700 diameter phis 28mm is hung over
On the pulley blocks of hoist engine or the suspension hook (20) of crane, big lid (12) is slowly promoted；
12) when the hoisting depth of Dang great Gai (12) bottom surface is more than the top surface 50mm of M105 connection bolts (10), mobile pulley group row
Vehicle or crane leave tower top, then slowly fall, and Jiang great Gai (12) is placed on the sleeper on ground；
13) after waiting for tower maintenance, the big lid (12) of dress is returned, 4 jackscrews (14) are rotated down, expose big lid (12) bottom surface
Then 28mm retracts 3mm, it is ensured that 4 jackscrews (14) are exposed independent from big base face 25mm；
14) again by two good 10 tons of bottle gouards moved by hands of bolt and 6 × 37+1-1700 diameter phis 28mm of two two strands of doublings
Steel wire rope is hung on the pulley blocks of hoist engine or the suspension hook (20) of crane, slowly promotes big lid (12) upwards；
15) when the hoisting depth of lid (12) bottom surface greatly is more than the top surface 50mm of M105 connection bolts (10), stop being promoted, it is mobile
Pulley blocks are driven a vehicle or crane, and Jiang great Gai (12) is moved on to right over cylinder (15)；
16) start hoist engine or crane, big lid (12) of slowly falling, Jiang great Gai (12) is placed on first to fourth pad of 26mm high
In piece group；
17) it is firm, firm to check whether first to fourth gasket group pads, checks whether perforation binding steel wire rope (23) is crushed to death；
18) extraction perforation binding steel wire rope (23)；
19) 4 jackscrews (14) are rotated, Jiang great Gai (12) jacks up 1mm, tears adhesive tape off, each at the top of first to fourth gasket group
Extract the jackscrew filling pad II (242) of two panels 1mm out, subsequent negative direction rotation jackscrew (14) makes to cover (12) decline 1mm greatly, again
It extracts the jackscrew filling pad II (242) at the top of first to fourth gasket group out two panels, and so on operates, until being pushed up all
Silk filling pad is completely drawn out, big to cover (12) completely in place；
20) after tower is run 72 hours, chain block (21), pulley blocks is removed, hoist engine or crane, site clearing are removed.
2. a kind of hanging method that tower heavy type is covered greatly according to claim 1, it is characterised in that：The perforation bundlees steel
Cord (23) is in contact position equipped with simmering and bending iron sheet or rubber slab with big lid (12) edge corner angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810441319.6A CN108439185B (en) | 2018-05-10 | 2018-05-10 | A kind of hanging method that tower heavy type is covered greatly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810441319.6A CN108439185B (en) | 2018-05-10 | 2018-05-10 | A kind of hanging method that tower heavy type is covered greatly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108439185A true CN108439185A (en) | 2018-08-24 |
| CN108439185B CN108439185B (en) | 2019-05-10 |
Family
ID=63202771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810441319.6A Active CN108439185B (en) | 2018-05-10 | 2018-05-10 | A kind of hanging method that tower heavy type is covered greatly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778102A (en) * | 2019-11-22 | 2020-02-11 | 上海宝冶集团有限公司 | Overhanging scaffold upright rod with anti-skid device and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201392994Y (en) * | 2009-03-05 | 2010-01-27 | 北京合纵实科电力科技有限公司 | European box-type transformer substation outer casing suspending device and European box-type transformer substation |
| CN203809197U (en) * | 2014-05-19 | 2014-09-03 | 中国长江电力股份有限公司 | Axial-flow Kaplan turbine runner overturning device |
| CN104477753A (en) * | 2014-12-16 | 2015-04-01 | 国家电网公司 | Power station unit top cover lifting appliance and lifting method thereof |
| CN204297913U (en) * | 2014-11-14 | 2015-04-29 | 山东海湾吊装工程股份有限公司 | Ammonia convertor special hanger |
-
2018
- 2018-05-10 CN CN201810441319.6A patent/CN108439185B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201392994Y (en) * | 2009-03-05 | 2010-01-27 | 北京合纵实科电力科技有限公司 | European box-type transformer substation outer casing suspending device and European box-type transformer substation |
| CN203809197U (en) * | 2014-05-19 | 2014-09-03 | 中国长江电力股份有限公司 | Axial-flow Kaplan turbine runner overturning device |
| CN204297913U (en) * | 2014-11-14 | 2015-04-29 | 山东海湾吊装工程股份有限公司 | Ammonia convertor special hanger |
| CN104477753A (en) * | 2014-12-16 | 2015-04-01 | 国家电网公司 | Power station unit top cover lifting appliance and lifting method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778102A (en) * | 2019-11-22 | 2020-02-11 | 上海宝冶集团有限公司 | Overhanging scaffold upright rod with anti-skid device and use method thereof |
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| CN108439185B (en) | 2019-05-10 |
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Address after: 230000 East Fozhang Road and North Tingyun Road Office Building, Hefei Economic and Technological Development Zone, Anhui Province Applicant after: China National Chemical Engineering Third Construction Co., Ltd. Address before: 232038 No. 98 Dongshan Road, Tianjiaan District, Huainan City, Anhui Province Applicant before: China National Chemical Engineering Third Construction Co., Ltd. |
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Effective date of registration: 20190918 Address after: 230000 Office of Fozhang Road East and Tingyun Road North, Hefei Economic and Technological Development Zone, Anhui Province Co-patentee after: CHINA CHEMICAL ENGINEERING HEAVY MECHANIZATION CO., LTD. Patentee after: China National Chemical Engineering Third Construction Co., Ltd. Address before: 230000 East Fozhang Road and North Tingyun Road Office Building, Hefei Economic and Technological Development Zone, Anhui Province Patentee before: China National Chemical Engineering Third Construction Co., Ltd. |