CN115652970A - Construction method of bidirectional water-stop cofferdam structure - Google Patents
Construction method of bidirectional water-stop cofferdam structure Download PDFInfo
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Abstract
A construction method of a bidirectional water-stop cofferdam structure comprises the following construction steps: s1, excavating and constructing a rock foundation; s2, constructing a concrete cushion and a horizontal waterstop; s3, grouting construction of a foundation curtain; s4, constructing an upper cast-in-place caisson structure; s5, backfilling stone materials in the box; and S6, verifying the structure of the bidirectional water-stopping cofferdam. The method comprises the steps of firstly excavating a lower rock foundation, then pouring a concrete cushion and embedding a horizontal rubber water stop, and grouting rock cracks by curtain grouting; after the top of the concrete cushion layer is roughened, an upper caisson structure is cast in place and vertical rubber water stops are arranged, finally stone materials are backfilled in the caisson, the upper caisson structure and the lower caisson structure are effectively connected, a bidirectional water stop cofferdam structure is formed, and bidirectional water stop effect is good.
Description
Technical Field
The invention relates to the technical field of construction water stopping, in particular to a construction method of a bidirectional water stopping cofferdam structure.
Background
The temporary dry dock of the large bay submarine tunnel is a immersed tube prefabricated site, the geological condition in the dock is complex, the ground is in an upper rock structure and a lower rock structure, the distribution is extremely irregular, the number of surrounding buildings is large, the immersed tube is deep in prefabricated draft, a prefabricated bottom plate is required to be deep, the occupied area is large, the construction period is short, the enclosure structure is formed by slope excavation in the traditional hydraulic construction, the occupied area is large, the geological condition is complex, the land use is limited, and the structural safety and the feasibility can not be guaranteed. Therefore, a water stop structure system capable of accelerating the construction progress, reducing the land occupation and reducing the rock excavation amount needs to be researched.
Disclosure of Invention
The invention aims to provide a construction method of a bidirectional water-stop cofferdam structure, which aims to solve the problems similar to the situations and adopts water-stop closed construction through a rock foundation to form a lower foundation water-stop system; the upper part of the cofferdam is of a cast-in-place concrete structure and is effectively connected with the upper part and the lower part to form an integral bidirectional water-stopping cofferdam structure.
The technical scheme adopted by the invention is as follows:
a construction method of a bidirectional water-stop cofferdam structure comprises the following construction steps:
s1, excavating and constructing a rock foundation:
analyzing the weathering degree of the rock foundation according to the early-stage investigation data, determining a basic bed rock elevation surface, and excavating to a set elevation by adopting mechanical equipment according to the weathering degree of the rock;
s2, construction of a concrete cushion and a horizontal waterstop:
according to the weathering degree of the rock, timely carrying out concrete cushion layer sealing construction, before the concrete cushion layer construction, cleaning the rock foundation surface without slag inclusion and soil inclusion, and embedding a horizontal rubber water stop; when the concrete cushion is poured, the concrete is vibrated fully, and the tight connection between the cushion and the rock interface and between the cushion and the horizontal rubber water stop belt is ensured;
s3, grouting construction of a foundation curtain:
after the strength of the concrete cushion layer meets the requirement, curtain grouting construction is carried out on two sides of the horizontal rubber water stop, the grouting depth and the hole distance are determined according to early-stage survey data and the permeability coefficient of a field water-pressing test, the rock cracks and the gaps between the concrete cushion layer and the rock foundation are mainly sealed, the filling is guaranteed to be compact, the water seepage situation does not exist, and concrete is sprayed on the side slope of the foundation;
s4, construction of an upper cast-in-place caisson structure:
after the curtain grouting construction is finished, chiseling the top of the concrete cushion layer, wherein chiseling is carried out to completely chisel the concrete surface to expose a fresh surface; then binding caisson structure steel bars, embedding a vertical rubber waterstop, erecting a erecting template and pouring structural concrete;
s5, backfilling stones in the box:
the upper cast-in-place caisson structure is completed, and after the concrete strength meets the requirement, the caisson cabin grids are filled with excavated stone slag materials; when backfilling, each compartment needs to be symmetrically and uniformly backfilled from the middle to two sides, so that the caisson structure is not influenced by unbalance loading, and a structural water stopping system is prevented from being damaged;
s6, verifying the structure of the bidirectional water-stopping cofferdam:
after all water stop structure systems are established and after work of each working procedure in the early stage is finished, water is injected into two sides of the cofferdam structure in sequence after the east dock immersed tube and the west dock immersed tube are prefabricated on the bottom plate, the water stop effect of the water stop structure is verified, and if water seepage occurs, supplementary grouting construction is carried out.
S4, in the step, a one-jump one-pouring method is adopted for pouring the caisson in a cast-in-place mode, vertical rubber water stops are arranged at the rabbet positions of the two sides of the caisson which is poured firstly, the vertical rubber water stops of the caisson are effectively bonded with the joints of the horizontal rubber water stops of the concrete cushion layer to form a whole, and the caisson which is poured later is required to be fully vibrated and compacted at the positions of the vertical rubber water stops and the horizontal rubber water stops.
And in the step S4, when caisson concrete is poured, the bottom plate, the outer wall and each partition wall need to be vibrated fully, and the caisson steel bar counter-pulling holes need to be blocked by waterproof mortar, so that the upper caisson structure system is ensured to have no water seepage.
And (5) performing anti-floating calculation and structural stability checking calculation according to the water level heights of the two sides of the cofferdam structure to ensure the safety and stability of the structure according to the structural size of the caisson and the elevation of the backfilled stone in the caisson in the steps S4, S5 and S6.
The invention has the beneficial effects that: the method comprises the steps of firstly excavating a lower rock foundation, then pouring a concrete cushion and embedding a horizontal rubber water stop, and grouting rock cracks by curtain grouting; after the top of the concrete cushion layer is roughened, an upper caisson structure is cast in place, a vertical rubber water stop belt is arranged, stone is backfilled in the caisson, the upper caisson structure and the lower caisson structure are effectively connected, a bidirectional water stop cofferdam structure is formed, and bidirectional water stop effect is good.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention.
Fig. 2 is a schematic bottom cross-sectional view of the upper caisson structure of this invention.
Wherein: 1-a rock foundation; 2-a base slope; 3-a bottom plate; 4-cushion to rock interface; 5-concrete cushion; 6-horizontal rubber waterstop; 7-rock fracture; 8-curtain grouting; 9-roughening the bedding surface; 10-caisson; 11-vertical rubber waterstops; 12-water levels at two sides of the cofferdam structure; 13-backfilling stone.
Detailed Description
Example 1
This embodiment uses the temporary dry dock of big even bay submarine tunnel as an example, and the two-way stagnant water cofferdam structure construction circumstances who relates to is: the two-way water-stop cofferdam structure is used for a partition wall structure in a dry dock, and separates east and west dock chambers to form two independently running dock chambers, and the two independently running dock chambers are used for immersed tube prefabrication construction and are not interfered with each other. The excavation elevation of the middle partition quay wall rock foundation 1 is below minus 8m, the elevation of the bottom of the caisson 10 structure is minus 8.0m, and the lower part rock foundation 1 is grouted by adopting double rows of curtain grouting 8; the upper caisson 10 is of a cast-in-place reinforced concrete structure, the length is 20.21m, the width is 13.6m, the height is 12.0m, 12 compartments are formed, the thickness of an outer partition wall is 50cm, the thickness of an inner partition wall is 30cm, and the strength of concrete is C50F 350.
The construction quality requirement is as follows: the lower part rock foundation 1 and the concrete cushion 5 meet the water stop requirement after grouting construction is carried out by double-row curtain grouting 8; the structural dimension of the upper caisson 10 meets the stability requirement, the water stop requirement is met between the caisson 10 body and the caisson 10, the water stop requirement is met between the bottom of the upper caisson 10 and the concrete cushion 5, the height of the stone filling in the caisson meets the anti-floating requirement, and finally the two-way water stop cofferdam structure with good water stop effect and safe structure is ensured to be formed.
The construction method of the bidirectional water-stop cofferdam structure specifically comprises the following steps:
s1, excavating and constructing a rock foundation:
analyzing the rock-soil interface according to the unit data of the dry dock early-stage investigation, determining that a bed rock elevation surface is about-8 m, and excavating to the elevation by adopting mechanical equipment after the earthwork is excavated;
s2, constructing a concrete cushion and a horizontal waterstop:
and (3) constructing a concrete cushion layer 5 in time, burying a horizontal rubber water stop 6, fully vibrating the concrete pouring, and ensuring that the cushion layer is tightly connected with the rock interface 4 and the horizontal rubber water stop 6.
S3, grouting construction of a foundation curtain:
after the strength of the concrete cushion 5 meets the requirement, curtain grouting 8 construction is carried out on two sides of the horizontal rubber water stop 6, the grouting depth is 13m, the hole spacing is 2m, and the row spacing is 1.5m, so that rock cracks 7 and gaps between the concrete cushion 5 and a rock foundation 1 are mainly plugged, dense filling is ensured, and concrete is sprayed on a foundation slope 2, as shown in a schematic section diagram of the invention in figure 1.
S4, construction of an upper cast-in-place caisson structure:
after the curtain grouting 8 is constructed, chiseling the concrete cushion 5, chiseling the concrete surface completely after chiseling, and exposing a fresh chiseling cushion surface 9; when the caisson 10 is cast in place, a one-jump one-pouring method is adopted, vertical rubber water stops 11 are arranged at the rabbets at the two sides of the caisson 10 which is poured firstly, the joints of the vertical rubber water stops 11 of the caisson 10 and the horizontal rubber water stops 6 of the concrete cushion layer 5 are effectively bonded to form a whole, and the caisson 10 which is poured later is fully vibrated and compacted at the positions of the vertical rubber water stops 11 and the horizontal rubber water stops 6; when the caisson 10 is poured by concrete, the bottom plate, the outer wall and each partition wall need to be vibrated fully, the caisson steel bar counter-pulling holes need to be blocked by waterproof mortar, and the water seepage situation of the upper caisson 10 structure system is avoided, as shown in the schematic bottom section view of the upper caisson structure in fig. 2.
S5, backfilling stones in the box:
after the construction of the upper caisson 10 structure is completed, anti-floating calculation and structural stability checking calculation are carried out according to the height of water levels 12 on the two sides of the cofferdam structure, the elevation of backfilling stone materials 13 is confirmed, excavating stone slag materials are filled into the cells of the caisson 10 to be +1m, each compartment needs to be symmetrically and uniformly backfilled during backfilling, and the caisson 10 structure is ensured not to be influenced by unbalance loading from the middle to the two sides, so that a structural water stopping system is prevented from being damaged;
s6, verifying the structure of the bidirectional water-stopping cofferdam:
after a water stopping system of the east and west dock chambers of the dry dock is established, after the east and west dock immersed pipes are prefabricated on the bottom plate 3, water is injected into the east and west docks in sequence, meanwhile, the water stopping effect of the middle partition quay wall is verified, and the supplementary grouting plugging construction is performed according to the local water seepage condition, so that the effect is good.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (4)
1. A construction method of a bidirectional water-stop cofferdam structure is characterized by comprising the following construction steps:
s1, excavating and constructing a rock foundation:
analyzing the weathering degree of the rock foundation (1) according to the early-stage investigation data, determining a basic bed rock elevation surface, and excavating to a set elevation by adopting mechanical equipment according to the rock weathering degree;
s2, construction of a concrete cushion and a horizontal waterstop:
according to the weathering degree of the rock, the concrete cushion (5) is constructed in a closed manner in time, before the concrete cushion (5) is constructed, the surface of the rock foundation (1) needs to be cleaned, no slag and soil are included, and a horizontal rubber water stop (6) is buried; when the concrete cushion layer (5) is poured, the concrete is sufficiently vibrated, and the tight connection between the cushion layer and the rock interface (4) and between the cushion layer and the horizontal rubber water stop (6) is ensured;
s3, grouting construction of a foundation curtain:
after the strength of the concrete cushion (5) meets the requirement, curtain grouting (8) construction is carried out on two sides of the horizontal rubber water stop (6), the grouting depth and the hole pitch are determined according to early-stage survey data and the permeability coefficient of a field water-pressing test, a rock crack (7) and a gap between the concrete cushion (5) and the rock foundation (1) are mainly sealed, the filling is guaranteed to be compact, the water seepage condition does not exist, and concrete is sprayed on the foundation side slope (2);
s4, construction of an upper cast-in-place caisson structure:
after the curtain grouting (8) is completed, chiseling the top of the concrete cushion (5), wherein chiseling is performed to completely chisel the concrete surface and expose a fresh chiseling cushion surface (9); then binding caisson structure steel bars, burying a vertical rubber water stop (11), erecting a formwork and pouring structural concrete;
s5, backfilling stone materials in the box:
the upper cast-in-place caisson (10) is structurally finished, and after the concrete strength meets the requirement, the chamber grids of the caisson (10) are filled with excavated ballast; when backfilling, each compartment needs to be symmetrically and uniformly backfilled from the middle to two sides, so that the structure of the caisson (10) is not influenced by unbalance loading, and the structural water-stopping system is prevented from being damaged;
s6, verifying the structure of the bidirectional water-stopping cofferdam:
after all water stop structure systems are established and the work of each working procedure in the early stage is finished, water is injected into the two sides of the cofferdam structure in sequence after the east dock immersed tube and the west dock immersed tube are prefabricated on the bottom plate (3), the water stop effect of the water stop structure is verified, and if the water seepage condition exists, supplementary grouting construction is carried out.
2. The construction method of the two-way water stop cofferdam structure according to claim 1, characterized in that in the step S4, the caisson (10) is cast in place by a one-jump-one-casting method, the rabbet on both sides of the caisson (10) cast first is provided with a vertical rubber water stop (11), the joint of the vertical rubber water stop (11) of the caisson (10) and the horizontal rubber water stop (6) of the concrete cushion (5) needs to be effectively bonded to form a whole, and the caisson (10) cast later needs to be sufficiently vibrated and compacted at the positions of the vertical rubber water stop (11) and the horizontal rubber water stop (6).
3. The construction method of a two-way water-stop cofferdam structure according to claim 2, characterized in that when the caisson (10) is concreted in step S4, the bottom plate, the outer wall and each partition wall are vibrated sufficiently, and the pull-out holes of the reinforcing steel bars of the caisson (10) are sealed by waterproof mortar, so as to ensure that the upper caisson (10) structure system has no water seepage.
4. The construction method of a two-way water stop cofferdam structure according to claim 1, characterized in that the structural size of the caisson (10) and the level of the backfill stone (13) in the caisson in the steps S4, S5 and S6 are calculated according to the height of the water level (12) at both sides of the cofferdam structure, and the structural stability is checked to ensure the safety and stability of the structure.
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| CN217710566U (en) * | 2022-04-29 | 2022-11-01 | 中交第三航务工程局有限公司 | Dock corridor water stopping system |
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- 2022-12-26 CN CN202211670334.0A patent/CN115652970B/en active Active
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| KR100854338B1 (en) * | 2008-04-02 | 2008-08-26 | 최승희 | Construction structure of open caisson cofferdam using holding type sheet pile |
| CN102828521A (en) * | 2012-08-16 | 2012-12-19 | 中交第二航务工程局有限公司 | Underwater water-stopping method for precast pile caps |
| CN104727333A (en) * | 2015-02-16 | 2015-06-24 | 中交四航局第二工程有限公司 | Dock gate caisson structure capable of achieving two-way water stop |
| CN107780422A (en) * | 2017-11-21 | 2018-03-09 | 中船第九设计研究院工程有限公司 | A kind of caisson cofferdam method of high-pressure rotary-spray pile water stopping curtain |
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