Assembled gravity concrete cofferdam and construction method thereof

Abstract

The present invention relates to the technical field of hydraulic engineering construction, and is an assembled gravity concrete cofferdam and a construction method thereof, wherein the assembled gravity concrete cofferdam comprises a lower cofferdam wall and an upper cofferdam wall; the lower cofferdam wall is composed of a plurality of concrete caissons spliced ​​in sequence; the upper cofferdam wall is arranged on the top of the lower cofferdam wall, and the upper cofferdam wall comprises a first breast wall and a second breast wall, the first breast wall is placed on the edge of the top of the concrete caisson on the backwater side, the second breast wall is placed on the edge of the top of the concrete caisson on the water-facing side, the first breast wall and the second breast wall are respectively composed of a plurality of concrete modules spliced ​​in sequence, and slag is backfilled between the first breast wall and the second breast wall; wherein the top of each concrete caisson in contact with the bottom of the first breast wall and the second breast wall is provided with a leveling layer, and a water stop is provided on the top of the leveling layer between the concrete caisson and the second breast wall. The assembled gravity concrete cofferdam is easy to install and disassemble, and is easy to stop water.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic engineering construction, and is an assembled gravity concrete cofferdam and a construction method thereof. Background Art

[0002] At present, most of the existing prefabricated cofferdams are small in size and are only suitable for river construction. In large cofferdams used in the sea, prefabricated cofferdams are rarely used because they are difficult to install when the component size is large, and they are difficult to stop water under high head conditions. Therefore, the problems of difficult installation and difficult water stopping in existing prefabricated cofferdams have greatly limited the application of prefabricated cofferdams in large cofferdams. At the same time, the components of existing prefabricated cofferdams are usually connected by concrete pouring and tie rods, with many installation and dismantling procedures, low construction efficiency, and difficult to guarantee the visual quality. Therefore, how to provide a prefabricated cofferdam that is easy to install and disassemble and easy to stop water, so as to be suitable for sea or high head conditions, is a technical problem that urgently needs to be solved. Summary of the invention

[0003] In response to the above technical problems, the present invention provides an assembled gravity concrete cofferdam and a construction method thereof, wherein the components of the assembled gravity concrete cofferdam can meet the use requirements by relying on their own weight, without the need for structural connection between the components, and are easy to install and disassemble. The water-stopping structure between the components can meet the water-stopping requirements under high head conditions, and can be applicable to large, medium and small vertical cofferdams.

[0004] The present invention provides an assembled gravity concrete cofferdam, comprising:

[0005] The lower cofferdam wall is composed of several concrete caissons spliced ​​in sequence;

[0006] The upper cofferdam wall is arranged on the top of the lower cofferdam wall, and includes a first breast wall and a second breast wall. The first breast wall is placed on the edge of the top of the concrete caisson on the backwater side, and the second breast wall is placed on the edge of the top of the concrete caisson on the water-facing side. The first breast wall and the second breast wall are respectively composed of a number of concrete modules spliced ​​in sequence, and the space between the first breast wall and the second breast wall is backfilled with slag.

[0007] Among them, the part where the top of each concrete caisson contacts the bottom of the first breast wall, and the part where the top of each concrete caisson contacts the bottom of the second breast wall, are both provided with a leveling layer; a waterstop is provided on the top of the leveling layer between the concrete caisson and the second breast wall to stop the water in the gap between the top of the concrete caisson and the bottom of the second breast wall.

[0008] In some of the embodiments, a plurality of load-bearing steel pads are embedded in the leveling layer to support the concrete modules constituting the first breast wall and the second breast wall.

[0009] In some of the embodiments, there are two waterstops in the leveling layer on the top of each concrete caisson, and each waterstop is laid along the contact surface between the top of the outer wall of the concrete caisson and the bottom of the second breast wall to surround the gap between the top of each concrete caisson and the bottom of the second breast wall; part of the load-bearing steel pads in the leveling layer are evenly distributed between the two waterstops along the laying direction of the waterstop, and grooves for placing the waterstops are reserved in the leveling layer on both sides of the load-bearing steel pads.

[0010] In some of the embodiments, the leveling layer is cast by fine stone concrete.

[0011] In some of the embodiments, the waterstop is a water-swellable rubber strip.

[0012] In some of the embodiments, each concrete caisson is backfilled with sand, a connecting cavity is formed between two adjacent concrete caissons, plastic concrete is poured on the water side of the connecting cavity to connect the two adjacent concrete caissons into one, and the remaining space of the connecting cavity is backfilled with crushed stone.

[0013] In some of the embodiments, two adjacent concrete modules are connected as one by pouring plastic concrete.

[0014] In some of the embodiments, there are two concrete modules placed on top of each concrete caisson in the first breast wall, and there are also two concrete modules placed on top of each concrete caisson in the second breast wall.

[0015] The present invention also provides a construction method for assembling a gravity concrete cofferdam as described in any of the above technical solutions, comprising the following steps:

[0016] Prefabricate the concrete caissons required to form the lower cofferdam wall, and the concrete modules required to form the first breast wall and the second breast wall;

[0017] The concrete caissons are sequentially sunk to the bottom of the water, sand is backfilled into the concrete caissons, plastic concrete is poured into the water side of the connection cavity between two adjacent concrete caissons, and gravel is backfilled into the remaining space of the connection cavity, so that the concrete caissons are connected into one body to form the lower cofferdam wall;

[0018] Pour the leveling layer on the edge of the backwater side and the edge of the water side of the top of the concrete caisson respectively, and lay a water stop strip on the top of the leveling layer on the water side;

[0019] The concrete modules for forming the first breast wall are sequentially sunk onto the leveling layer on the backwater side, and plastic concrete is poured between two adjacent concrete modules to form the first breast wall; the concrete modules for forming the second breast wall are sequentially sunk onto the leveling layer on the waterfront side, and the waterstop is compressed by the gravity of the concrete modules, and plastic concrete is poured between two adjacent concrete modules to form the second breast wall; slag is backfilled between the first breast wall and the second breast wall to connect the first breast wall and the second breast wall to form the upper cofferdam wall.

[0020] In some of the embodiments, before pouring the leveling layer, a number of load-bearing steel pads are arranged on the top of the concrete caisson, so that the load-bearing steel pads can be used as leveling elevation control points; after pouring the leveling layer, the concrete module is sunk on the load-bearing steel pads, so that the load-bearing steel pads can be used to support the concrete module.

[0021] Compared with the prior art, the advantages and positive effects of the present invention are:

[0022] The assembled gravity concrete cofferdam provided by the present invention adopts concrete caissons to splice the lower cofferdam wall at its lower part, and after being leveled by the leveling layer, concrete modules are sunk thereon to splice and form the first breast wall and the second breast wall, wherein the second breast wall on the water side compresses the waterstop laid on the leveling layer by its own gravity, and slag is backfilled between the first breast wall and the second breast wall so that the first breast wall and the second breast wall are connected to form the upper cofferdam wall. The whole installation process is simple, and at the same time, the waterstop is stopped by gravity pressure connection, the waterstop operation is simple and the waterstop effect is good, which can meet the waterstop requirements under high head conditions and can be suitable for large, medium and small vertical cofferdams. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A schematic diagram of the structure of an assembled gravity concrete cofferdam provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of the lower cofferdam wall of the assembled gravity concrete cofferdam provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the structure of the upper cofferdam wall of the assembled gravity concrete cofferdam provided in an embodiment of the present invention;

[0027] Figure 4 for Figure 1 A partial enlarged view of the middle A;

[0028] Figure 5A plan view of the load-bearing steel pad and waterstop in the assembled gravity concrete cofferdam provided in an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Lower cofferdam wall; 2. Upper cofferdam wall; 3. Leveling layer; 4. Waterstop; 5. Load-bearing steel pad;

[0031] 11. Concrete caisson; 12. Sand; 13. Plastic concrete a; 14. Gravel;

[0032] 21. First breast wall; 22. Stone slag; 23. Second breast wall; 201. Concrete module; 202. Plastic concrete b. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “center”, “up”, “down”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figure 1-Figure 4As shown, an embodiment of the present invention provides an assembled gravity concrete cofferdam, including a lower cofferdam wall 1 located at the bottom and an upper cofferdam wall 2 located at the top; the lower cofferdam wall 1 is composed of a plurality of concrete caissons 11 spliced ​​in sequence; the upper cofferdam wall 2 is arranged on the top of the lower cofferdam wall 1, and the upper cofferdam wall 2 includes a first breast wall 21 and a second breast wall 23, the first breast wall 21 is placed on the edge of the backwater side of the top of the concrete caisson 11, and the second breast wall 23 is placed on the edge of the water side of the top of the concrete caisson 11, and the first breast wall 21 and The second breast walls 23 are each composed of a number of concrete modules 201 spliced ​​in sequence, and slag 22 is backfilled between the first breast wall 21 and the second breast wall 23; wherein, the portion where the top of each concrete caisson 11 contacts the bottom of the first breast wall 21, and the portion where the top of each concrete caisson 11 contacts the bottom of the second breast wall 23, are both provided with a leveling layer 3; a waterstop 4 is provided on the top of the leveling layer 3 between the concrete caisson 11 and the second breast wall 23 to stop water in the gap between the top of the concrete caisson 11 and the bottom of the second breast wall 23.

[0037] The above-mentioned assembled gravity concrete cofferdam adopts concrete caissons 11 to splice the lower cofferdam wall 1 at its lower part. After being leveled by the leveling layer 3, concrete modules 201 are sunk thereon to splice and form the first breast wall 21 and the second breast wall 23. The second breast wall 23 on the water side compresses the waterstop 4 laid on the leveling layer 3 by its own gravity, and backfills slag 22 between the first breast wall 21 and the second breast wall 23 so that the first breast wall 21 and the second breast wall 23 are connected to form the upper cofferdam wall 2. The whole installation process is simple. At the same time, the waterstop is achieved by gravity pressing, and the waterstop operation is simple and the waterstop effect is good. It can meet the waterstop requirements under high head conditions and can be suitable for large, medium and small vertical cofferdams.

[0038] like Figure 4 and Figure 5 As shown, a plurality of load-bearing steel pads 5 are embedded in the leveling layer 3 to support the concrete modules 201 constituting the first breast wall 21 and the second breast wall 23. The load-bearing steel pads 5 arranged in the leveling layer 3 can, on the one hand, serve as a base to provide elastic support to the concrete modules 201 sunk upwards, and on the other hand, can serve as leveling elevation control points when pouring the leveling layer 3, which is conducive to rapid leveling.

[0039] like Figure 4 and Figure 5As shown, there are two waterstops 4 in the leveling layer 3 on the top of each concrete caisson 11, and each waterstop 4 is laid along the contact surface between the top of the outer wall of the concrete caisson 11 and the bottom of the second breast wall 23 to surround the gap between the top of each concrete caisson 11 and the bottom of the second breast wall 23; part of the load-bearing steel pads 5 in the leveling layer 3 are evenly distributed between the two waterstops 4 along the laying direction of the waterstop 4, and grooves for placing the waterstop 4 are reserved in the leveling layer 3 on both sides of the load-bearing steel pads 5. Setting the waterstop 4 in this way is conducive to ensuring the water-stopping effect. It should be noted that in this embodiment, the waterstop 4 adopts a water-expanding rubber strip to meet the water-stopping requirements under high head conditions.

[0040] In order to make the lower cofferdam wall 1 more stable, Figure 2 As shown, each concrete caisson 11 is backfilled with sand 12, and a connecting cavity is formed between two adjacent concrete caissons 11. Plastic concrete a13 is poured on the water side of the connecting cavity to connect the two adjacent concrete caissons 11 into one, and the remaining space of the connecting cavity is backfilled with crushed stone 14.

[0041] In order to make the connection between the first breast wall 21 and the second breast wall 23 more secure, Figure 3 As shown, two adjacent concrete modules 201 are connected as one by pouring plastic concrete b202.

[0042] In order to facilitate leveling of the concrete module 201 when constructing the first breast wall 21 and the second breast wall 23 at the upper part, preferably, the leveling layer 3 is cast by fine stone concrete.

[0043] In order to maintain stability, Figure 5 As shown, preferably, there are two concrete modules 201 placed on the top of each concrete caisson 11 in the first breast wall 21, and there are also two concrete modules 201 placed on the top of each concrete caisson 11 in the second breast wall 23. It should be noted that in this embodiment, the two concrete modules 201 placed on the top of each concrete caisson 11 in the first breast wall 21 are symmetrically arranged with respect to the central axis plane of the concrete caisson 11, and the two concrete modules 201 placed on the top of each concrete caisson 11 in the second breast wall 23 are also symmetrically arranged with respect to the central axis plane of the concrete caisson 11.

[0044] The embodiment of the present invention also provides a construction method for assembling a gravity concrete cofferdam, comprising the following steps:

[0045] S1, prefabricate the concrete caisson 11 required to form the lower cofferdam wall 1, and the concrete modules 201 required to form the first breast wall 21 and the second breast wall 23.

[0046] S2. Sink the concrete caissons 11 to the bottom of the water in sequence, backfill the concrete caissons 11 with sand 12, pour plastic concrete a13 on the water side of the connection cavity between two adjacent concrete caissons 11, and backfill the remaining space of the connection cavity with gravel 14, so that the concrete caissons 11 are connected into one to form the lower cofferdam wall 1.

[0047] S3, pour the leveling layer 3 on the edge of the back water side and the edge of the water side of the top of the concrete caisson 11, and lay the water stop 4 on the top of the leveling layer 3 on the water side. It should be noted that before laying the water stop 4, it is necessary to press a groove on the top of the leveling layer 3 to facilitate the installation of the water stop 4 and ensure the water stopping effect.

[0048] S4, sequentially sink the concrete modules 201 for forming the first breast wall 21 onto the leveling layer 3 on the back side, and pour plastic concrete b202 between two adjacent concrete modules 201 to form the first breast wall 21; sequentially sink the concrete modules 201 for forming the second breast wall 23 onto the leveling layer 3 on the water side, and compress the waterstop 4 by the gravity of the concrete modules 201, and pour plastic concrete b202 between two adjacent concrete modules 201 to form the second breast wall 23; backfill slag 22 between the first breast wall 21 and the second breast wall 23, so that the first breast wall 21 and the second breast wall 23 are connected to form the upper cofferdam wall 2.

[0049] It should be noted that before pouring the leveling layer 3, a number of load-bearing steel pads 5 are arranged on the top of the concrete caisson 11, so that the load-bearing steel pads 5 can be used as leveling elevation control points; after pouring the leveling layer 3, the concrete module 201 is sunk on the load-bearing steel pads 5, so that the load-bearing steel pads 5 can be used to support the concrete module 201.

[0050] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A construction method for assembling a gravity concrete cofferdam, characterized in that: Assembling gravity concrete cofferdam includes: The lower cofferdam wall is composed of a plurality of concrete caissons spliced ​​in sequence; each of the concrete caissons is backfilled with sand, a connecting cavity is formed between two adjacent concrete caissons, plastic concrete is poured on the water side of the connecting cavity to connect the two adjacent concrete caissons into one, and the remaining space of the connecting cavity is backfilled with crushed stone; An upper cofferdam wall, the upper cofferdam wall is arranged on the top of the lower cofferdam wall, the upper cofferdam wall comprises a first breast wall and a second breast wall, the first breast wall is placed on the edge of the top of the concrete caisson on the backwater side, the second breast wall is placed on the edge of the top of the concrete caisson on the water-facing side, the first breast wall and the second breast wall are respectively composed of a plurality of concrete modules spliced ​​in sequence, the first breast wall and the second breast wall are backfilled with slag; two adjacent concrete modules are connected as a whole by pouring plastic concrete; Wherein, the portion where the top of each concrete caisson contacts the bottom of the first breast wall, and the portion where the top of each concrete caisson contacts the bottom of the second breast wall, are both provided with a leveling layer; a plurality of load-bearing steel pads are pre-embedded in the leveling layer to support the concrete modules constituting the first breast wall and the second breast wall; a water stop is provided on the top of the leveling layer between the concrete caisson and the second breast wall to stop the gap between the top of the concrete caisson and the bottom of the second breast wall; The construction method includes the following steps: Prefabricate the concrete caissons required to form the lower cofferdam wall, and the concrete modules required to form the first breast wall and the second breast wall; The concrete caissons are sequentially sunk to the bottom of the water, sand is backfilled into the concrete caissons, plastic concrete is poured into the water side of the connection cavity between two adjacent concrete caissons, and gravel is backfilled into the remaining space of the connection cavity, so that the concrete caissons are connected into one body to form the lower cofferdam wall; Pour the leveling layer on the edge of the backwater side and the edge of the water side of the top of the concrete caisson respectively, and lay a water stop strip on the top of the leveling layer on the water side; The concrete modules for forming the first breast wall are sequentially sunk onto the leveling layer on the backwater side, and plastic concrete is poured between two adjacent concrete modules to form the first breast wall; the concrete modules for forming the second breast wall are sequentially sunk onto the leveling layer on the waterfront side, and the water stop is compressed by the gravity of the concrete modules, and plastic concrete is poured between two adjacent concrete modules to form the second breast wall; slag is backfilled between the first breast wall and the second breast wall, so that the first breast wall and the second breast wall are connected to form an upper cofferdam wall; Before pouring the leveling layer, several load-bearing steel pads are arranged on the top of the concrete caisson, so that the load-bearing steel pads are used as the leveling elevation control points; after pouring the leveling layer, the concrete module is sunk on the load-bearing steel pads, so that the load-bearing steel pads are used to support the concrete module; There are two waterstop strips in the leveling layer on the top of each concrete caisson, and each of the waterstop strips is laid along the contact surface between the top of the outer wall of the concrete caisson and the bottom of the second breast wall to surround the gap between the top of each concrete caisson and the bottom of the second breast wall; part of the load-bearing steel pads in the leveling layer are evenly distributed between the two waterstop strips along the laying direction of the waterstop strips, and grooves for placing the waterstop strips are reserved in the leveling layer on both sides of the load-bearing steel pads.

2. The construction method for assembling a gravity concrete cofferdam according to claim 1, characterized in that: The leveling layer is cast by fine stone concrete.

3. The construction method for assembling a gravity concrete cofferdam according to claim 1, characterized in that: The waterstop is a water-swellable rubber strip.

4. The construction method for assembling a gravity concrete cofferdam according to claim 1, characterized in that: There are two concrete modules placed on the top of each concrete caisson in the first breast wall, and there are also two concrete modules placed on the top of each concrete caisson in the second breast wall.

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