CN103924621A - Concrete bypassing preventing device with pulp stopping plates and concrete bypassing preventing construction method for H-shaped steel joint of wall chase of underground continuous wall - Google Patents
Concrete bypassing preventing device with pulp stopping plates and concrete bypassing preventing construction method for H-shaped steel joint of wall chase of underground continuous wall Download PDFInfo
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Abstract
A concrete bypassing preventing device provided with pulp stopping plates and used for an H-shaped steel joint of a wall chase of an underground continuous wall comprises two pulp stopping plates, wherein the two pulp stopping plates are respectively arranged on flange plates of an H-shaped water stopping steel plate of the underground continuous wall; one ends of the pulp stopping plates are fixedly connected with the flange plates of the H-shaped water stopping steel plate; the other ends of the pulp stopping plates are free ends; one of the pulp stopping plates is fixedly connected with the inside of one of the flange plates of the H-shaped water stopping steel plate; the other pulp stopping plate is fixedly connected with the outside of the flange plate on the other side of the H-shaped water stopping steel plate; the pulp stopping plates are galvanized iron sheets; the thicknesses of the galvanized iron sheets are 0.5mm; and the lengths of the galvanized iron sheets are longer than a reinforcement cage by about 500mm. During construction, the pulp stopping plate on the inner side of the flange plate on the lower side of the H-shaped water stopping steel plate is arranged at first, then the pulp stopping plate on the outer side of the flange plate on the upper side of the H-shaped water stopping steel plate is arranged, the free ends of the pulp stopping plates are not required to be connected with reinforcing steel bars, so that the free ends of the pulp stopping plates can be opened without limitation during pouring of concrete, and can be totally opened according to designed requirements, the poured concrete is effectively prevented from bypassing and entering an H-shaped steel web plate, and the problem of bypassing of the concrete at the joint can be well solved.
Description
Technical field
The present invention relates to a kind of construction techniques and device, particularly the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate and anti-concrete stream construction method.
Background technology
Under normal circumstances; the topping of the main muscle of diaphragm wall is 50mm～70mm; therefore concrete because the imprecision of protection may produce concrete to stream and enter in H shaped steel and adjacent cells groove section along H shaped steel outside, has caused difficulty to the excavation, punching, cleaning etc. in later stage in the process of perfusion.
For preventing that concrete from streaming and entering in H shaped steel and adjacent cells groove section along H shaped steel outside, the method that construction adopts is at present: at the elongated interior subsides plastic foam plate of H shaped steel scope, and fill sand hill or mud drum; The method has following deficiency:
1, fill sand hill or mud drum engineering quantity is large, labor intensive is large and cannot reclaim, cycle engineering time is long, and occupied ground is larger;
2, the thing such as foam, sandbag that remains in H shaped steel wing plate place may cause the seepage of groove section joint;
3, the plastic foam plate that paste H shaped steel both sides can produce buoyancy in the decentralization process of reinforcing cage, and plastic foam plate is easy to floating; And because the buoyancy of both sides is likely unequal, can cause the inclination of reinforcing cage to be difficult for laying;
4, having the headroom of main tendon protective layer due to H shaped steel outside,, often there is concrete and streams phenomenon in the filling protection imprecision of sand hill or mud drum.Affect the construction of adjacent cells groove section.
For solving in the time that ground-connecting-wall is constructed, effectively prevention joint concrete circumferential motion problem, patent announcement number is CN203129188U, denomination of invention is: the utility model patent of " the anti-by-pass means of underground continuous wall connector " discloses the anti-by-pass means of a kind of underground continuous wall connector, and its mounting method being disclosed: " installs when this diaphragm wall is anti-streams iron sheet 1, two measure-alike iron sheets 1 are chosen in employing, the link 11 use fine steel rib pressure weldings of iron sheet 1 are on the frange plate of the both sides of I shape steel plate for sealing water 3, the both sides at manufactured reinforcing cage 2 by the 12 difference colligations of the free end of iron sheet 1 again, so that transfer reinforcing cage 2 in the interior entirety of groove section 4 of having constructed, after above-mentioned completing, reinforcing cage 2 is arrived in groove section 4 together with iron sheet 1 below, then free end 12 and reinforcing cage 2 are unclamped, to its concreting, " to reach the object of preventing joint concrete to stream.
This device is feasible theoretically, but in the time of practice of construction, this device also has the following disadvantages: the one, and iron sheet 1 is to be welded on the frange plate outside, both sides of I shape steel plate for sealing water 3 (referring to this application Figure of description Fig. 1-Fig. 2, present specification accompanying drawing Fig. 7-Fig. 8), H shaped steel steel plate for sealing water 2 be very greatly, very heavy, iron sheet 1 is all welded on to frange plate outside, both sides, if construct below welding grouting plate in H shaped steel outside, constructs just very inconvenient; If in H shaped steel outside, grouting plate is not welded in construction below, when grouting plate has been welded in construction, H shaped steel steel plate for sealing water need to turn the grouting plate that could weld opposite side, so H shaped steel steel plate for sealing water needs not convenient construction of secondary displacement;
Secondly when this device construction, be, " the 12 difference colligations of the free end of iron sheet 1, in the both sides of manufactured reinforcing cage 2, to be arrived reinforcing cage 2 in groove section 4 together with iron sheet 1 below, then free end 12 and reinforcing cage 2 are unclamped; "; because the diaphragm wall degree of depth is generally more than 10 meters; be very dark very large; and the size of reinforcing cage 2 is basically identical with diaphragm wall groove section to be poured length size; reinforcing cage 2 being transferred to together with iron sheet 1 in diaphragm wall groove section 4 to be poured; then free end 12 and reinforcing cage 2 are unclamped and can not be accomplished, owing to free end 12 and reinforcing cage 2 can not being unclamped, after concrete perfusion, free-ended the opening in its underpart is limited, can not all open, the effect that therefore its prevention joint concrete streams is given a discount widely.
Summary of the invention
The object of the present invention is to provide a kind of enforceable " the underground continuous wall groove segment H shaped steel joint anti-concrete by-pass means of grouting plate and anti-concrete thereof stream construction method ", to overcome the weak point of " the anti-by-pass means of underground continuous wall connector ", solve in the time that ground-connecting-wall is constructed, effectively prevent underground continuous wall groove segment H shaped steel joint concrete circumferential motion problem.
The technical scheme addressing the above problem is: the anti-concrete by-pass means of a kind of underground continuous wall groove segment H shaped steel joint grouting plate, comprise two blocks of grouting plates that are arranged at respectively on ground-connecting-wall I shape steel plate for sealing water frange plate, described grouting plate one end is fixedly connected with I shape steel plate for sealing water frange plate, the other end is free end, it is characterized in that: wherein a grouting plate is fixedly connected with the inner side of the following frange plate of I shape steel plate for sealing water, another piece grouting plate is fixedly connected with the outside of I shape steel plate for sealing water top frange plate.
The further technical scheme of the anti-concrete by-pass means of described underground continuous wall groove segment H shaped steel joint grouting plate is: described grouting plate is that thickness is that 0.5mm, width K are the galvanized sheet iron that 500～700mm, length are greater than length of reinforcing cage 400～600mm.
Its another relevant technical scheme is: the anti-concrete of a kind of underground continuous wall groove segment H shaped steel joint grouting plate streams construction method, it is the method for utilizing the anti-concrete by-pass means of the above-mentioned underground continuous wall groove segment H of the present invention shaped steel joint grouting plate to realize the anti-concrete of underground continuous wall groove segment H shaped steel joint grouting plate to stream construction, and it comprises the following steps:
A. get the raw materials ready: prepare grouting plate and grouting plate press strip, select thickness be 0.5mm, width K be 500～700mm, length be greater than length of reinforcing cage 400～600mm galvanized sheet iron as grouting plate, adopt φ 18 reinforcing bars as grouting plate press strip;
B., grouting plate inside the following frange plate of H shaped steel is set: first lay grouting plate in the following frange plate of the H of reinforced mesh both sides shaped steel inner side, grouting plate and frange plate overlap joint 100mm, then arrange reinforced mesh horizontal bar, horizontal bar is pushed down grouting plate and H shaped steel overlap joint 150mm, and be connected together with H steel welding, weld length is 10 times of horizontal bar diameter;
C., grouting plate outside the frange plate of H shaped steel top is set: first lay grouting plate in H shaped steel top frange plate outside, grouting plate overlaps 100mm with frange plate, and as the elongated auxiliary welding that arranges of grouting plate press strip, spot pitch is 300mm with φ 18 reinforcing bars;
D. after groove section grooving acceptance(check), the reinforcing bar cage hoisting welding is entered to groove and install, calibrate errorless being fixed on and lead on wall;
E. concreting: the strict concreting height of controlling in pouring construction process, build after beginning, answer compactness to carry out continuously, must not rest midway;
In concreting process, note fluctuation in stage situation in the decline of observation tube inner concrete and hole, measured hole inner concrete face height in time, the lifting of accurate instruction conduit and dismounting, prevent that concrete from streaming into other groove section.
Compared with prior art, the present invention's the underground continuous wall groove segment H shaped steel joint anti-concrete by-pass means of grouting plate and anti-concrete stream construction method and have following beneficial effect:
(1) with existing employing at the elongated interior subsides plastic foam plate of H shaped steel scope, and fill sand hill or mud drum and compare, the grouting plate 1 that the present invention is arranged on ground-connecting-wall I shape steel plate for sealing water 2 frange plates adopts galvanized sheet iron to make, grouting plate is lightweight, cost is low, construction technology is simple, and prevents streaming effective.
(2) be CN203129188U with patent announcement number, denomination of invention is: " the anti-by-pass means of underground continuous wall connector " compared, the more reasonable structure of the present invention's the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate, processing and fabricating, meet construction production order, convenient construction and anti-stream effective:
1. the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate of the present invention, wherein a grouting plate is fixedly connected with the inner side of the following frange plate of I shape steel plate for sealing water, and another piece grouting plate is fixedly connected with the outside of I shape steel plate for sealing water top frange plate; Therefore, in when construction, grouting plate inside the following frange plate of H shaped steel is first set, then arranges reinforced mesh horizontal bar, horizontal bar is pushed down grouting plate and is overlapped 150mm with H shaped steel, and is connected together with H steel welding, and weld length is 10 times of horizontal bar diameter; After grouting plate outside the frange plate of H shaped steel top is set, and thickness and the width dimensions of apparatus of the present invention grouting plate 1 are suitable, there is certain rigidity, when construction, without the free end of grouting plate is connected with reinforcing bar, therefore, when concrete perfusion, grouting plate free end opens unrestricted, can all open by designing requirement, galvanized sheet iron prevented well that concrete perfusion from streaming and entered in H shape steel web, avoided the difficulty of adjacent cells groove section excavation, clear groove, cleaning interface.
Therefore, the present invention's the underground continuous wall groove segment H shaped steel joint anti-concrete by-pass means of grouting plate and anti-concrete stream construction method, meet building energy conservation, save land, the utilization of construction space and economic and practical requirement; Provide a kind of novel construction method for processing similar engineering.
The technical characterictic that the underground continuous wall groove segment H shaped steel joint anti-concrete by-pass means of grouting plate below in conjunction with drawings and Examples to the present invention and anti-concrete stream construction method is described further.
Brief description of the drawings
Fig. 1: the linear pattern groove section elevation (longitudinal section) that the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate of the present invention is installed;
The A-A sectional view of Fig. 2: Fig. 1;
Fig. 3: the steel bar girder of reinforcing cage;
The B-B sectional view (cross section) of Fig. 4: Fig. 1;
The C portion enlarged drawing of Fig. 5: Fig. 4;
Fig. 6-Fig. 7: the anti-concrete of underground continuous wall groove segment H shaped steel joint grouting plate of the present invention streams the procedure schematic diagram of construction;
Fig. 6: not before fluid concrete; Fig. 7: after fluid concrete;
Fig. 8-Fig. 9: structure and the scheme of installation of existing " the anti-by-pass means of underground continuous wall connector ".
In Fig. 1-Fig. 7:
1-grouting plate, 11-is positioned at the grouting plate of the frange plate inner side of I shape steel plate for sealing water, and 12-is positioned at the grouting plate in the frange plate outside of I shape steel plate for sealing water;
2-I shape steel plate for sealing water, 21, the frange plate of 22-I shape steel plate for sealing water;
3-grouting plate press strip; 4-hangs muscle; 5-reinforcing cage;
6-groove section, 61-cell wall;
7-concrete, the adjacent groove section of not constructing of 8-;
JH-fillet welding, SMH-double welding; Wherein, fillet welding is the welding of H shaped steel processing, and double welding is the two-sided welding of reinforcing cage and H shaped steel inner side;
CK-groove section width, CL-groove segment length, the CS-groove section degree of depth;
K-grouting plate width, L-I shape steel plate for sealing water length; All the other mark meanings are referring to manual;
In Fig. 8-Fig. 9, the mark of existing " the anti-by-pass means of underground continuous wall connector " is referring to manual background technology.
Detailed description of the invention
Embodiment mono-:
The anti-concrete by-pass means of a kind of underground continuous wall groove segment H shaped steel joint grouting plate, comprise two blocks of grouting plates 1 that are arranged at respectively on ground-connecting-wall I shape steel plate for sealing water 2 frange plates, described grouting plate 1 one end is fixedly connected with I shape steel plate for sealing water frange plate, the other end is free end, wherein a grouting plate 11 is fixedly connected with the inner side of the following frange plate 21 of I shape steel plate for sealing water, and another piece grouting plate 12 is fixedly connected with (referring to Fig. 1, Fig. 4-Fig. 5) with the outside of I shape steel plate for sealing water top frange plate 22.
Described grouting plate 1 is that thickness is the galvanized sheet iron that 0.5mm, length are greater than length of reinforcing cage 500mm, and grouting plate width K is 500mm, adopts diameter phi=18mm reinforcing bar as grouting plate press strip 3.
As the one conversion of the embodiment of the present invention, width K and the length of described grouting plate 1 can also be adjusted according to actual needs, and general, the width K of described grouting plate 1 is 500～700mm, and length is greater than length of reinforcing cage 400～600mm.
Embodiment bis-:
The anti-concrete of a kind of underground continuous wall groove segment H shaped steel joint grouting plate streams construction method, it is the method for utilizing the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate described in embodiment mono-to realize the anti-concrete of underground continuous wall groove segment H shaped steel joint grouting plate to stream construction, and it comprises the following steps (referring to Fig. 4, Fig. 5):
A. get the raw materials ready: prepare grouting plate and grouting plate press strip, select thickness be 0.5mm, length be greater than length of reinforcing cage 400～600mm galvanized sheet iron as grouting plate, grouting plate width K is 400～600mm, adopts diameter phi=18mm reinforcing bar as grouting plate press strip 3;
B., grouting plate inside the following frange plate of H shaped steel is set: first lay grouting plates 11 in the following frange plate of the H of reinforced mesh both sides shaped steel 21 inner sides, grouting plate 11 overlaps 100mm with frange plate 21, then arrange reinforcing cage net sheet horizontal bar, horizontal bar is pushed down grouting plate and H shaped steel overlap joint 150mm, and be connected together with H steel welding, weld length is 10 times of horizontal bar diameter;
C., grouting plate outside the frange plate of H shaped steel top is set: first lay grouting plates 12 in H shaped steel top frange plate 22 outsides, grouting plate 12 overlaps 100mm with frange plate 22, with diameter phi=18mm reinforcing bar, as the elongated auxiliary welding that arranges of grouting plate press strip 3, spot pitch is 300mm;
D. after groove section grooving acceptance(check), the reinforcing cage net sheet welding is lifted to groove 6 and install, calibrate errorless being fixed on and lead (referring to Fig. 1, Fig. 2, Fig. 6) on wall 61;
E. concreting: the strict concreting height of controlling in pouring construction process, build after beginning, answer compactness to carry out continuously, must not rest midway;
In concreting process, note fluctuation in stage situation in the decline of observation tube inner concrete and hole, measured hole inner concrete face height in time, the lifting of accurate instruction conduit and dismounting, prevent that concrete from streaming into other groove section.
Above-mentioned grouting plate width K is 400～600mm.
From Fig. 6, Fig. 7 can find out that the underground continuous wall groove segment H shaped steel joint anti-concrete by-pass means of grouting plate of the present invention and the anti-concrete of underground continuous wall groove segment H shaped steel joint grouting plate thereof stream the advantage of construction method, in Fig. 6, the inside and outside grouting plate 11 of I shape steel plate for sealing water frange plate of the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate of the present invention, 12 free end is the surface that free state is close to reinforcing cage, after cast, by means of the mobile lateral pressure of pouring concrete, by grouting plate 11, groove section soil wall surface is close in 12 extruding, reach the object that prevents that concrete from streaming.
Claims (3)
1. the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate, comprise two blocks of grouting plates (1) that are arranged at respectively on ground-connecting-wall I shape steel plate for sealing water (2) frange plate, described grouting plate (1) one end is fixedly connected with I shape steel plate for sealing water frange plate, the other end is free end, it is characterized in that: wherein a grouting plate (11) is fixedly connected with the inner side of the following frange plate of I shape steel plate for sealing water (21), another piece grouting plate (12) is fixedly connected with the outside of I shape steel plate for sealing water top frange plate (22).
2. the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate according to claim 1, is characterized in that: described grouting plate (1) is that thickness is that 0.5mm, width K are the galvanized sheet iron that 500～700mm, length are greater than length of reinforcing cage 400～600mm.
3. the anti-concrete of underground continuous wall groove segment H shaped steel joint grouting plate streams construction method, it is characterized in that: it is the method for utilizing the anti-concrete by-pass means of underground continuous wall groove segment H shaped steel joint grouting plate described in claim 1 to realize the anti-concrete of underground continuous wall groove segment H shaped steel joint grouting plate to stream construction, and it comprises the following steps:
A. get the raw materials ready: prepare grouting plate and grouting plate press strip, select thickness be 0.5mm, width K be 500～700mm, length be greater than length of reinforcing cage 400～600mm galvanized sheet iron as grouting plate, adopt φ 18 reinforcing bars as grouting plate press strip (3);
B., grouting plate inside the following frange plate of H shaped steel is set: first lay grouting plate (11) in the following frange plate of the H of reinforced mesh both sides shaped steel (21) inner side, grouting plate (11) and frange plate (21) overlap joint 100mm, then arrange reinforced mesh horizontal bar, horizontal bar is pushed down grouting plate and H shaped steel overlap joint 150mm, and be connected together with H steel welding, weld length is 10 times of horizontal bar diameter;
C., grouting plate outside the frange plate of H shaped steel top is set: first lay grouting plate (12) in H shaped steel top frange plate (22) outside, grouting plate (12) and frange plate (22) overlap joint 100mm, with φ 18 reinforcing bars, as the elongated auxiliary welding that arranges of grouting plate press strip (3), spot pitch is 300mm;
D. after groove section grooving acceptance(check), the reinforcing bar cage hoisting welding is entered to groove (6) and install, calibrate errorless being fixed on and lead on wall (61);
E. concreting: the strict concreting height of controlling in pouring construction process, build after beginning, answer compactness to carry out continuously, must not rest midway;
In concreting process, note fluctuation in stage situation in the decline of observation tube inner concrete and hole, measured hole inner concrete face height in time, the lifting of accurate instruction conduit and dismounting, prevent that concrete from streaming into other groove section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410133123.2A CN103924621B (en) | 2014-03-31 | 2014-03-31 | Underground continuous wall groove segment H profile steel joint grouting plate anti-concrete by-pass means and anti-concrete stream construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410133123.2A CN103924621B (en) | 2014-03-31 | 2014-03-31 | Underground continuous wall groove segment H profile steel joint grouting plate anti-concrete by-pass means and anti-concrete stream construction method |
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| CN103924621A true CN103924621A (en) | 2014-07-16 |
| CN103924621B CN103924621B (en) | 2015-12-16 |
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Cited By (10)
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| CN104153347A (en) * | 2014-08-29 | 2014-11-19 | 上海建工七建集团有限公司 | Repair structure of underground diaphragm wall panel notch and construction method of repair structure |
| CN107653872A (en) * | 2017-11-07 | 2018-02-02 | 中建局集团建设发展有限公司 | The rigid joint of ultra-deep ground-connecting-wall integrates water-stopping system and its construction method |
| CN107816068A (en) * | 2017-11-24 | 2018-03-20 | 中国矿业大学 | A kind of diaphram wall brush wall concrete streams detection, processing unit and construction method |
| CN108301399A (en) * | 2018-01-25 | 2018-07-20 | 中铁隧道集团二处有限公司 | The anti-by-pass means and its construction method reused in a kind of construction of ground-connecting-wall |
| CN109056699A (en) * | 2018-08-02 | 2018-12-21 | 浙江理工大学 | A kind of novel locking notch pipe |
| CN110528500A (en) * | 2019-07-24 | 2019-12-03 | 青岛理工大学 | A kind of high rich water borders on the sea regional ground continuous wall connector water-stopping method |
| CN110528502A (en) * | 2018-05-23 | 2019-12-03 | 中铁七局集团西安铁路工程有限公司 | A kind of anti-construction method streamed of diaphram wall H-type connector |
| CN110994523A (en) * | 2019-12-31 | 2020-04-10 | 广东顺德电力设计院有限公司 | Method and system for protecting cable |
| WO2021013201A1 (en) * | 2019-07-24 | 2021-01-28 | 青岛理工大学 | Water stopping device and method for ground continuous wall joint in high-water-rich coastal area |
| CN114991227A (en) * | 2022-06-21 | 2022-09-02 | 中交第二航务工程局有限公司 | Underground diaphragm wall I-shaped steel joint posture and streaming detection device and method |
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| CN104153347A (en) * | 2014-08-29 | 2014-11-19 | 上海建工七建集团有限公司 | Repair structure of underground diaphragm wall panel notch and construction method of repair structure |
| CN104153347B (en) * | 2014-08-29 | 2016-05-18 | 上海建工七建集团有限公司 | Preparing structure and the construction method thereof of underground continuous wall width breach |
| CN107653872A (en) * | 2017-11-07 | 2018-02-02 | 中建局集团建设发展有限公司 | The rigid joint of ultra-deep ground-connecting-wall integrates water-stopping system and its construction method |
| CN107816068A (en) * | 2017-11-24 | 2018-03-20 | 中国矿业大学 | A kind of diaphram wall brush wall concrete streams detection, processing unit and construction method |
| CN108301399A (en) * | 2018-01-25 | 2018-07-20 | 中铁隧道集团二处有限公司 | The anti-by-pass means and its construction method reused in a kind of construction of ground-connecting-wall |
| CN110528502A (en) * | 2018-05-23 | 2019-12-03 | 中铁七局集团西安铁路工程有限公司 | A kind of anti-construction method streamed of diaphram wall H-type connector |
| CN109056699A (en) * | 2018-08-02 | 2018-12-21 | 浙江理工大学 | A kind of novel locking notch pipe |
| CN109056699B (en) * | 2018-08-02 | 2020-07-10 | 浙江理工大学 | Novel fore shaft pipe |
| CN110528500A (en) * | 2019-07-24 | 2019-12-03 | 青岛理工大学 | A kind of high rich water borders on the sea regional ground continuous wall connector water-stopping method |
| WO2021013201A1 (en) * | 2019-07-24 | 2021-01-28 | 青岛理工大学 | Water stopping device and method for ground continuous wall joint in high-water-rich coastal area |
| CN110994523A (en) * | 2019-12-31 | 2020-04-10 | 广东顺德电力设计院有限公司 | Method and system for protecting cable |
| CN114991227A (en) * | 2022-06-21 | 2022-09-02 | 中交第二航务工程局有限公司 | Underground diaphragm wall I-shaped steel joint posture and streaming detection device and method |
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| CN103924621B (en) | 2015-12-16 |
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Application publication date: 20140716 Assignee: Chaoyang Shantou Construction Engineering General Corporation Assignor: THE FIFTH CONSTRUCTION ENGINEERING COMPANY OF GUANGXI CONSTRUCTION ENGINEERING Group Contract record no.: 2015450000044 Denomination of invention: Concrete bypassing preventing device with pulp stopping plates and concrete bypassing preventing construction method for H-shaped steel joint of wall chase of underground continuous wall License type: Exclusive License Record date: 20150723 |
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