CN102021912A - Method for constructing special shaped deepwater cofferdams on steep rocky riverbeds - Google Patents
Method for constructing special shaped deepwater cofferdams on steep rocky riverbeds Download PDFInfo
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- CN102021912A CN102021912A CN 201010556962 CN201010556962A CN102021912A CN 102021912 A CN102021912 A CN 102021912A CN 201010556962 CN201010556962 CN 201010556962 CN 201010556962 A CN201010556962 A CN 201010556962A CN 102021912 A CN102021912 A CN 102021912A
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- cofferdam
- riverbed
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- cofferdam wall
- rubble
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Abstract
The invention discloses a method for constructing special shaped deepwater cofferdams on steep rocky riverbeds. The method is characterized by comprising the following steps: preferably selecting a prefabricated cofferdam wall, and arranging a grouting pipe which penetrates through the cofferdam wall up and down along the vertical direction in the cofferdam wall; then sinking the cofferdam wall on the riverbed, exposing the top end of the pipe above the water level, and using the grouting pipe to jet water to wash the riverbed; finally, filling the two sides of the cofferdam wall with broken stones, pouring cement mortar into the bottom of the cofferdam wall and the broken stones via the grouting pipe, draining the water in the cofferdam after the cement mortar and the broken stones are bonded and achieve the strength, and excavating a foundation pit in the absence of water, thus completing construction of bridge foundation. The method can be used for pretreating the riverbed without using equipment and is especially suitable for construction of deepwater cofferdams.
Description
Technical field
The present invention relates to Construction of Civil Engineering, be specifically related to the job practices in cofferdam and the isolated plant in the construction.
Background technology
At present, when construct on rock matter riverbed in the deep water cofferdam, hard because of the rock stratum, difficulty of construction such as the implantation in cofferdam, the sinking of burying, fixing, back cover are quite big, and construction is difficult to successfully when channel gradient is big.Therefore, in engineering design, usually bridge foundation is avoided as far as possible the position of unfavorable geology such as deep water, abrupt slope, rock matter riverbed, landform, hydrologic condition coexistence.Yet because of being subjected to bridge line position, bridge type, striding effects limit such as footpath, cost, above-mentioned situation can't be avoided sometimes, just sometimes inevitably need be on the abrupt slope or rock matter riverbed the cofferdam is set.And do not have reliable job practices to construct with this understanding in the prior art.
Summary of the invention
Main purpose of the present invention provides the job practices in special-shaped deep water cofferdam on a kind of simple and reliable rock matter riverbed, abrupt slope, so that the cofferdam construction on abrupt slope, deep water or rock matter riverbed is easy to implement.
The job practices in the special-shaped cofferdam of the present invention is characterized in constructing as follows:
A, prefabricated cofferdam wall are provided with the mud jacking pipeline of up/down perforation cofferdam wall longitudinally in the wall of described cofferdam;
B, the cofferdam wall is sunk down into the riverbed, the top of described pipeline is emerging in more than the water surface, utilize described pipeline to wash the riverbed with jetting;
C, throw in the both sides of described cofferdam wall and to fill out rubble, by mud jacking pipeline jar cementing mortar in the bottom of cofferdam wall and rubble; Treat cement mortar combine with rubble reach intensity after, drain water body in the cofferdam, excavation pit under anhydrous situation is finished the construction of bridge foundation.
The characteristics of the special-shaped cofferdam construction method of the present invention also are:
Throwing the rubble fill out among the described step c and be with wall position, cofferdam is the center, and both sides are mentioned ridge-shaped.
Described mud jacking pipeline in the wall of cofferdam at interval, and evenly arrange.
In described step a, the plan view shape of prefabricated cofferdam wall is " U " shape, with described " " U " shape cofferdam wall and a side riverbed constitute jointly the sealing cofferdam.
In described step a, the bottom end face of prefabricated cofferdam wall has the shape that the rock matter surface with the riverbed of position matches.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention injects cement mortar after utilizing mud jacking pipe flushing riverbed in the rubble of wall both sides, cofferdam, treats that mortar and rubble form the base station that is connected riverbed rock and cofferdam wall in conjunction with the back, with the fixing cofferdam wall and constitute the cofferdam of base station.Need not in the construction riverbed to be carried out preliminary treatment, especially be fit to the construction in deep water cofferdam with miscellaneous equipment;
2, the inventive method need not to destroy the rock stratum, riverbed in construction, so the soft or hard of riverbed rock matter can not influence construction, and therefore the inventive method also is particluarly suitable for constructing in abrupt slope and the hard rock matter riverbed
3, the inventive method, simple and reliable need not complex apparatus, and construction cost is low, construction feasibility height.
Description of drawings
Fig. 1 is the construction environment schematic diagram for the treatment of of the present invention;
Fig. 2 is the schematic diagram in the cofferdam construction process of the present invention;
Fig. 3 is the schematic diagram after cofferdam construction of the present invention is finished;
Fig. 4 is the structural representation of cofferdam of the present invention wall.
Number in the figure: 1 riverbed face, 2 horizontal planes, 3 rock mass, 4 rubbles, 5 bridge foundations, 6 cofferdam walls, 7 mud jacking pipelines.
The specific embodiment
Present embodiment is to need to construct a bridge basis 5 in environment as shown in Figure 1, and among Fig. 1, being positioned at the riverbed of horizontal plane below 2 is rock matter riverbed, it is rock mass 3, the rock matter of rock mass 3 is harder, and the rock matter surface of riverbed face 1 is great slope, so be not suitable for fixedly cofferdam wall 6 of fluting or other method.
Referring to Fig. 2 and Fig. 3, construct as follows in the cofferdam in the present embodiment:
1, prefabricated cofferdam wall 6, are provided with the mud jacking pipeline 7 of up/down perforation cofferdam wall 6 longitudinally in cofferdam wall 6, mud jacking pipeline 7 in cofferdam wall 6 at interval and evenly arrange;
2, cofferdam wall 6 is sunk down into the riverbed, keep the top of mud jacking pipeline 7 to be emerging in horizontal plane more than 2, utilize mud jacking pipeline 7 with jetting flushing riverbed, flushing operation can begin to carry out when cofferdam wall 6 is about to sink to the riverbed face, after sinking the location, cofferdam wall 6 continues flushing, mud on the riverbed face is rinsed totally, so that follow-up rubble mortar combines firmly with rock mass 3 and cofferdam wall 6;
Can adopt steel cofferdam wall 6, integral prefabricated moulding and moving on in the water of cofferdam wall 6 sinks to the riverbed of construction location then, also can be with the cofferdam wall 6 of a plurality of plates of making amalgamation and mutual affixed formation in water;
3, fill out rubble in the both sides of cofferdam wall 6 and along the both side surface throwing of cofferdam wall 6, making and throwing the rubble of filling out 4 is the center with cofferdam wall 6 positions, and both sides are mentioned ridge-shaped;
4, by mud jacking pipeline 7 cementing mortar in the bottom of cofferdam wall 6 and rubble 4, admixture accelerating admixture in the cement mortar, cement mortar should be able to be gone along with sb. to guard him the footing of cofferdam wall, can dive under water and check.
5, treat cement mortar combine with rubble 4 reach intensity after, drain water body in the cofferdam, excavation pit under anhydrous situation is finished the construction of bridge foundation 5.
The global shape in cofferdam can be set to difformity according to the construction needs, comprise cylindrical shape and square tube shape, also can be as shown in Figure 2, help by means of formation cofferdam, riverbed in a side, for this reason, it is that " U " shape gets final product that 6 on cofferdam wall needs to form plan view shape, and with U type cofferdam wall 6 and a side rock mass 3 common zones, cofferdam that constitute sealing, the water of draining then in the zone, cofferdam can carry out the construction construction of bridge foundation.
Referring to Fig. 4, the lower end of cofferdam wall 6 usually should be according to the gradient on the surface of rock mass 3 the different undulations that are shown in Figure 4 that are provided with, the undulations on this undulations and rock matter surface matches, the lower end mouth of pipe of mud jacking pipeline 7 should be emerging in the lower surface of cofferdam wall 6, this makes wall 6 bottom end faces in cofferdam roughly fit with the riverbed, be convenient to cofferdam wall 6 and when being completely fixed as yet, be not easy to stablize, so that construction; Because of the surface of rock mass 3 itself can not be definitely smooth, between the bottom end face of cofferdam wall 6 and riverbed 1, must there be the slit, this makes cement mortar can flow in the rubble 4 swimmingly, also can on the bottom end face of cofferdam wall 6, breach be set, or when the cement injection mortar, suitably promoting cofferdam wall 6, these measures can both guarantee that the cast of cement mortar is evenly smooth and easy; In the little occasion of the surface undulation of rock mass 3, cofferdam wall 6 bottom end faces can be for concordant, and just every cofferdam wall 6 all is upright shape.
In concrete the enforcement, mud jacking pipeline 7 embeds in the cofferdam wall 6, just mud jacking pipeline 7 is fixedly installed between the inside and outside wall steel plate of steel cofferdam wall 6, gusset and floor are set between the inside and outside wall steel plate, easier cofferdam wall 6 both sides that flow to of cement mortar in the mud jacking pipeline 7 in this form of structure combine with rubble, cofferdam wall 6 smooth outer surfaces avoid mud jacking pipeline 7 to be damaged in construction simultaneously.
In the structure shown in Figure 4, mud jacking pipeline 7 in cofferdam wall 6 at interval, and evenly arrange, the upper end of mud jacking pipeline 7 is revealed in above water, and mud jacking pipeline 7 being evenly distributed with in cofferdam wall 6 is beneficial to and guarantees that the flushing riverbed is more even with the injection cement mortar, guarantees that the cofferdam is firmly stable; In concrete the enforcement, can make the top of cofferdam wall 6 exceed horizontal plane 2, and the top of mud jacking pipeline 7 exceeds cofferdam wall 6 tops, so more help being connected of mud jacking pipeline 7 and water pump and concrete pump, should note avoiding pipeline 7 oversize and bent damage simultaneously.
Claims (5)
1. the job practices in special-shaped deep water cofferdam on the rock matter riverbed, an abrupt slope is characterized in that constructing as follows:
A, prefabricated cofferdam wall (6) are provided with the mud jacking pipeline (7) of up/down perforation cofferdam wall longitudinally in described cofferdam wall (6);
B, cofferdam wall (6) is sunk down into the riverbed, the top of described mud jacking pipeline (7) is emerging in more than the water surface, utilize described pipeline (7) with jetting flushing riverbed;
C, throw in the both sides of described cofferdam wall (6) and to fill out rubble (4), by mud jacking pipeline (7) jar cementing mortar in the bottom of cofferdam wall (6) and rubble; Treat cement mortar combine with rubble reach intensity after, drain water body in the cofferdam, excavation pit under anhydrous situation is finished the construction of bridge foundation (5).
2. the job practices in special-shaped deep water cofferdam on the rock matter riverbed, abrupt slope according to claim 1, it is characterized in that among the described step c throwing the rubble of filling out and be with cofferdam wall (6) position is the center, both sides are mentioned ridge-shaped.
3. according to the job practices in special-shaped deep water cofferdam on the rock matter riverbed, the described abrupt slope of claim 1, it is characterized in that described mud jacking pipeline (7) in cofferdam wall (6) at interval, and evenly arrange.
4. the job practices in special-shaped deep water cofferdam on the rock matter riverbed, abrupt slope according to claim 1, it is characterized in that in described step a, the plan view shape of prefabricated cofferdam wall (6) is " U " shape, with described " " U " shape cofferdam wall and a side riverbed (3) common formation sealing cofferdam.
5. the job practices in special-shaped deep water cofferdam is characterized in that in described step a on the rock matter riverbed, abrupt slope according to claim 1, and the bottom end face of prefabricated cofferdam wall (6) has the shape that the rock matter surface (1) with the riverbed (1) of position matches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105569627A CN102021912B (en) | 2010-11-24 | 2010-11-24 | Method for constructing special shaped deepwater cofferdams on steep rocky riverbeds |
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| CN2010105569627A CN102021912B (en) | 2010-11-24 | 2010-11-24 | Method for constructing special shaped deepwater cofferdams on steep rocky riverbeds |
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| CN102021912A true CN102021912A (en) | 2011-04-20 |
| CN102021912B CN102021912B (en) | 2012-07-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392458A (en) * | 2011-10-17 | 2012-03-28 | 中铁一局集团有限公司 | Piling beam cofferdam construction method used for bare rock foundation construction in water |
| CN104727332A (en) * | 2015-03-19 | 2015-06-24 | 中交二航局第三工程有限公司 | Steel sheet pile cofferdam bottom rock-socketed anchoring method |
| CN110565672A (en) * | 2019-08-28 | 2019-12-13 | 中铁大桥局集团有限公司 | construction method of bare rock low-pile bearing platform foundation |
| CN111705806A (en) * | 2020-06-18 | 2020-09-25 | 深圳市蛇口招商港湾工程有限公司 | Underwater earth and rockfill excavation method for foundation pits in deep water area |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009074269A (en) * | 2007-09-19 | 2009-04-09 | Ohbayashi Corp | Underwater structure reinforcing method and underwater structure |
| CN101736720A (en) * | 2009-12-01 | 2010-06-16 | 中国第一冶金建设有限责任公司 | Bottom sealing method for intestinal bag concrete, plastic clay and conventional concrete in steel cofferdam |
| CN101886397A (en) * | 2010-07-09 | 2010-11-17 | 中铁十局集团有限公司 | Special-shaped steel cofferdam |
-
2010
- 2010-11-24 CN CN2010105569627A patent/CN102021912B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009074269A (en) * | 2007-09-19 | 2009-04-09 | Ohbayashi Corp | Underwater structure reinforcing method and underwater structure |
| CN101736720A (en) * | 2009-12-01 | 2010-06-16 | 中国第一冶金建设有限责任公司 | Bottom sealing method for intestinal bag concrete, plastic clay and conventional concrete in steel cofferdam |
| CN101886397A (en) * | 2010-07-09 | 2010-11-17 | 中铁十局集团有限公司 | Special-shaped steel cofferdam |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392458A (en) * | 2011-10-17 | 2012-03-28 | 中铁一局集团有限公司 | Piling beam cofferdam construction method used for bare rock foundation construction in water |
| CN102392458B (en) * | 2011-10-17 | 2014-05-07 | 中铁一局集团有限公司 | Piling beam cofferdam construction method used for bare rock foundation construction in water |
| CN104727332A (en) * | 2015-03-19 | 2015-06-24 | 中交二航局第三工程有限公司 | Steel sheet pile cofferdam bottom rock-socketed anchoring method |
| CN110565672A (en) * | 2019-08-28 | 2019-12-13 | 中铁大桥局集团有限公司 | construction method of bare rock low-pile bearing platform foundation |
| CN111705806A (en) * | 2020-06-18 | 2020-09-25 | 深圳市蛇口招商港湾工程有限公司 | Underwater earth and rockfill excavation method for foundation pits in deep water area |
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| CN102021912B (en) | 2012-07-04 |
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Owner name: ANHUI ROAD + BRIDGE ENGINEERING CO., LTD. Free format text: FORMER OWNER: ANHUI CONSTRUCTION ENGINEERING GROUP CO., LTD. Effective date: 20131202 |
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Free format text: CORRECT: ADDRESS; FROM: 230031 HEFEI, ANHUI PROVINCE TO: 230088 HEFEI, ANHUI PROVINCE |
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Effective date of registration: 20131202 Address after: 230088 No. 445, Mount Huangshan Road, Hefei, Anhui Patentee after: ANHUI ROAD & BRIDGE ENGINEERING CO., LTD. Address before: Wuhu road in Baohe District of Hefei city in Anhui province 230031 Construction Building No. 325 Patentee before: Anhui Construction Engineering Group Co., Ltd. |