阅读说明：本技术 一种导流装置及利用该装置对河道进行分幅施工的方法 (Flow guide device and method for framing construction of river channel by using same ) 是由 张昌桔 索靖 杨守臻 谭英明 陈建邦 王景华 陈铁铭 林一帆 邓全胜 金坚刚 姜 于 2021-08-19 设计创作，主要内容包括：本发明公开了一种导流装置及利用该装置对河道进行分幅施工的方法,所述导流装置为双U型导流结构,包括上U型钢筋混凝土结构和拉森钢板桩,上U型钢筋混凝土结构的开口向上,所述拉森钢板桩设于上U型钢筋混凝土结构底板的下方,与上U型钢筋混凝土结构的两侧墙相互垂直构成倒U型结构,将河道分成两期进行施工,将双U型导流结构置于已施工的一期隧道以上,作为二期施工期间临时性河道的过水通道和一期已施工隧道的防护结构。本发明结构特点鲜明,在河道正常通航、防洪排涝的前提下,确保横穿河道的隧道能够安全顺利地建设,防止水流渗漏进隧道。(The invention discloses a diversion device and a method for carrying out framing construction on a river channel by using the diversion device, wherein the diversion device is a double-U-shaped diversion structure and comprises an upper U-shaped reinforced concrete structure and Larsen steel sheet piles, the openings of the upper U-shaped reinforced concrete structure are upward, the Larsen steel sheet piles are arranged below a bottom plate of the upper U-shaped reinforced concrete structure and are mutually vertical to two side walls of the upper U-shaped reinforced concrete structure to form an inverted U-shaped structure, the river channel is divided into two stages for construction, and the double-U-shaped diversion structure is arranged above a constructed first-stage tunnel and is used as a water channel of a temporary river channel during second-stage construction and a protective structure of the constructed first-stage tunnel. The invention has clear structural characteristics, and ensures that the tunnel crossing the river channel can be safely and smoothly constructed on the premise of normal navigation, flood control and drainage of the river channel, thereby preventing water from leaking into the tunnel.)

1. The flow guide device is characterized by being a double-U-shaped flow guide structure (1) and comprising an upper U-shaped reinforced concrete structure (11) and Larsen steel sheet piles (12), wherein the openings of the upper U-shaped reinforced concrete structure (11) are upward, the Larsen steel sheet piles (12) are arranged below the bottom plate of the upper U-shaped reinforced concrete structure (11) and are perpendicular to two side walls of the upper U-shaped reinforced concrete structure (11) to form an inverted U-shaped structure.

2. Flow guiding device according to claim 1, characterised in that the larsen steel sheet piles (12) are embedded in the upper U-shaped reinforced concrete structure (11) at a floor of not less than 10 cm.

3. The method for performing framing construction on the river channel by using the flow guide device as claimed in claim 2, wherein the river channel is divided into two stages for construction, and the method specifically comprises the following steps:

1) first-stage construction: carrying out cofferdam closure on a river channel constructed in the first stage, taking the area outside the cofferdam as a second-stage project, still taking the second-stage area as a navigation channel in the first-stage construction process, ensuring normal traffic, backfilling earthwork in the area inside the first-stage cofferdam, driving the area of an excavated tunnel into a fender post (2), and defining the range;

2) carrying out foundation pit excavation on the area in the fender post (2), carrying out construction of a tunnel and a retaining wall (3) after excavation is finished, burying a grouting pipe between the fender post (2) and the side wall of the tunnel in a deep manner, and embedding and fixing the retaining wall (3) and the fender post (2);

3) after the construction in the step 2) is finished, backfilling the first-stage foundation pit by adopting rubble concrete;

4) after backfilling, filling a gap between the fender post (2) and the side wall of the tunnel by adopting double-slurry grouting, and then arranging a double-U-shaped flow guide structure (1) above the rubble concrete;

5) dismantling the first-stage cofferdam and carrying out second-stage construction;

6) second-stage construction: cofferdam is carried out on the river channel constructed in the second period, the fender post (2) is driven into the area where the tunnel is to be excavated, foundation pit excavation is carried out on the area inside the fender post (2), and tunnel construction is carried out after excavation is finished;

7) and (6) after the construction in the step 6) is finished, backfilling earthwork in the river channel, removing the second-stage cofferdam, the retaining wall (3) and the double-U-shaped flow guide structure (1), and recovering the normal navigation of the river channel.

4. The method as claimed in claim 3, wherein the step 4) of arranging the double U-shaped diversion structure (1) above the rubble concrete comprises driving Larsen steel sheet piles (12) into two sides of the backfilled foundation pit to form a cofferdam, wherein one end of the cofferdam of the Larsen steel sheet piles (12) is connected with the river bank, and then arranging the upper U-shaped reinforced concrete structure (11) above the Larsen steel sheet piles (12) on the two sides, wherein one side wall of the upper U-shaped reinforced concrete structure (11) is connected with the river bank, and the other side wall is attached to the retaining wall (3).

5. A method according to claim 4, characterized in that the cofferdam of step 6) is attached to the side walls of the upper U-shaped reinforced concrete structure (11) and the cofferdam is connected to the retaining wall (3).

6. The method of claim 3, wherein the backfill of the cofferdam and the river is clay with a fill compaction not less than 0.94.

7. The method as claimed in claim 3, wherein the second-stage area is widened to the shore by 1-3m when the second-stage area is used as a channel in the first-stage construction process.

Technical Field

The invention belongs to the technical field of engineering construction methods, and particularly relates to a flow guide device and a method for performing framing construction on a river channel by using the flow guide device.

Background

Modern society's traffic is more and more convenient, and the subway need carry out the excavation in tunnel before opening as trip vehicle, in the excavation process in tunnel, sometimes need pass the river course, and the traditional tunnel passes the construction method of river course under, need seal the navigation to the construction river course, often takes the mode of opening the river course in addition after sealing the navigation to keep normal current, and the shortcoming of the mode of opening the river course in addition lies in that the construction is complicated, and the engineering time is long, causes construction cost to improve.

Disclosure of Invention

In order to solve the above problems, the present invention provides a diversion device and a method for framing a river by using the diversion device.

In order to achieve the purpose, the following technical scheme is provided:

a flow guide device is a double-U-shaped flow guide structure and comprises an upper U-shaped reinforced concrete structure and Larsen steel sheet piles, wherein openings of the upper U-shaped reinforced concrete structure are upward, the Larsen steel sheet piles are arranged below a bottom plate of the upper U-shaped reinforced concrete structure and are perpendicular to two side walls of the upper U-shaped reinforced concrete structure to form an inverted U-shaped structure.

Further, the bottom plate of the U-shaped reinforced concrete structure is embedded into the Larsen steel sheet pile and is not smaller than 10 cm.

A method for carrying out framing construction on a river channel by using the diversion device divides the river channel into two stages for construction, and specifically comprises the following steps:

1) first-stage construction: carrying out cofferdam closure on a river channel constructed in the first stage, taking the area outside the cofferdam as a second-stage project, taking the second-stage area as a navigation channel in the first-stage construction process, ensuring normal traffic, backfilling earthwork in the area inside the first-stage cofferdam, driving the area of an excavated tunnel into a fender post, and defining the range;

2) excavating a foundation pit in the area of the fender post, constructing a tunnel and a retaining wall after the excavation is finished, burying a grouting pipe between the fender post and the side wall of the tunnel in a deep manner, and embedding and fixing the retaining wall and the fender post;

3) after the construction in the step 2) is finished, backfilling the first-stage foundation pit by adopting rubble concrete;

4) after backfilling, filling a gap between the fender post and the side wall of the tunnel by adopting double-slurry grouting, then arranging a double-U-shaped flow guide structure above the rubble concrete, wherein the upper U-shaped reinforced concrete structure is used as a water passing channel above the tunnel during second-stage construction; when the inverted U-shaped Larsen steel sheet pile structure is used for secondary construction, the protection cover is reversely buckled above the tunnel to prevent water in a river channel from permeating into the tunnel;

5) dismantling the first-stage cofferdam and carrying out second-stage construction;

6) second-stage construction: cofferdam is carried out on the river channel constructed in the second period, fender posts are driven into the areas where the tunnels are to be excavated, foundation pit excavation is carried out on the areas inside the fender posts, and tunnel construction is carried out after excavation is finished;

7) and 6) after the construction in the step 6) is finished, backfilling earthwork in the river channel, removing the second-stage cofferdam, the retaining wall and the double-U-shaped flow guide structure, and recovering the normal navigation of the river channel.

Further, the process of arranging the double-U-shaped diversion structure above the rubble concrete in the step 4) comprises driving Larsen steel sheet piles into two sides of the backfilled foundation pit to form a Larsen steel sheet pile cofferdam, wherein one end of the Larsen steel sheet pile cofferdam is connected with the river bank, then arranging an upper U-shaped reinforced concrete structure above the Larsen steel sheet pile cofferdam at two sides, one side wall of the upper U-shaped reinforced concrete structure is connected with the river bank, and the other side wall of the upper U-shaped reinforced concrete structure is attached to the retaining wall.

Furthermore, the cofferdam in the step 6) is attached to the side wall of the upper U-shaped reinforced concrete structure, the cofferdam is connected with the retaining wall, and meanwhile, because the retaining wall is embedded with the fender pile and the upper U-shaped reinforced concrete structure is used as a protective measure of the channel, water flow is effectively prevented from permeating into the second-stage engineering range.

Furthermore, clay is adopted as backfill earth of the cofferdam and the river channel, and the compaction degree of the fill is not less than 0.94.

Further, in the first-stage construction process, when the second-stage area is used as a navigation channel, the second-stage area is widened to the shore by 1-3 m.

The invention has the beneficial effects that: the construction method is simple to operate, the double-U-shaped diversion structure is arranged above the river channel in the first period through amplitude division construction of the foundation pit, the construction period is shortened, the efficiency is improved, the normal navigation of the river channel is guaranteed, and water flow is effectively prevented from permeating into the tunnel during the navigation of the river channel due to the arrangement of the inverted-U-shaped Larsen steel sheet piles.

Drawings

FIG. 1 is a schematic view of a first construction of the present invention;

FIG. 2 is a schematic diagram of the second stage of construction of the present invention;

fig. 3 is a schematic perspective view of the deflector of the present invention.

In the figure: 1. a double U-shaped flow guide structure; 11. an upper U-shaped reinforced concrete structure; 12. larsen steel sheet piles; 2. a fender pile; 3. a retaining wall.

Detailed Description

The invention will be further described with reference to the following examples and the accompanying drawings, but the scope of the invention is not limited thereto.

Examples

As shown in fig. 1, the first construction: carrying out cofferdam closure on a river channel constructed in the first stage, taking the area outside the cofferdam as a second-stage project, still taking the second-stage area as a navigation channel in the first-stage construction process, ensuring normal traffic, backfilling earthwork in the area inside the first-stage cofferdam, wherein the soil filling compactness is 0.96, driving the area of an excavated tunnel into a fender post 2, and defining the range; excavating a foundation pit in the enclosure pile 2, constructing a tunnel and a retaining wall 3 after the excavation is finished, burying a grouting pipe between the enclosure pile 2 and the tunnel side wall in a deep manner, and embedding and fixing the retaining wall 3 and the enclosure pile 2, wherein the thickness of the retaining wall 3 is 0.6 m; backfilling the first-stage foundation pit by adopting rubble concrete, wherein the rubble content of the rubble concrete is 25%; after backfilling, filling a gap between the fender post 2 and the side wall of the tunnel by adopting double-slurry grouting, and then arranging a double-U-shaped flow guide structure 1 above the rubble concrete, wherein the thickness of a middle bottom plate of the double-U-shaped flow guide structure 1 is 0.5 m; as shown in fig. 3, the double U-shaped diversion structure 1 includes an upper U-shaped reinforced concrete structure 11 and a larsen steel sheet pile 12 disposed below a bottom plate of the upper U-shaped reinforced concrete structure 11, and is perpendicular to two side walls of the upper U-shaped reinforced concrete structure 11 to form an inverted U-shaped structure, and the upper U-shaped reinforced concrete structure 11 is used as a water passing channel above a tunnel during second-stage construction; when the inverted U-shaped Larsen steel sheet pile 12 is used for secondary construction, a protective cover is reversely buckled above a primary tunnel to prevent water in a river channel from permeating into the tunnel, in the construction process, the Larsen steel sheet pile 12 is firstly driven into two sides of a primary foundation pit, then an upper U-shaped reinforced concrete structure 11 is arranged above the Larsen steel sheet piles 12 on two sides, the upper end of the Larsen steel sheet pile 12 is embedded into a bottom plate 12cm of the upper U-shaped reinforced concrete structure 11, after the double U-shaped diversion structure 1 is installed, one side wall of the upper U-shaped reinforced concrete structure 11 is attached to a shore, the other side wall is attached to a retaining wall 3, and one end of a cofferdam formed by the Larsen steel sheet piles 12 is embedded into the shore; and (5) dismantling the first-stage cofferdam and carrying out second-stage construction.

As shown in fig. 2, the second construction stage: cofferdam is carried out on the river channel constructed in the second stage, one side of the second stage cofferdam is attached to the side wall of the upper U-shaped reinforced concrete structure 11 and is embedded and fixed with one end of the Larsen steel sheet pile 12, the shape of the upper U-shaped reinforced concrete structure 11 is determined according to the second stage cofferdam, the second stage cofferdam needs to be attached to the side wall of the upper U-shaped reinforced concrete structure 11, the second stage cofferdam mainly comprises a steel sheet pile cofferdam and a reinforced concrete retaining wall, the cofferdam is connected with two sides of a retaining wall 3, the joint of the steel sheet pile cofferdam and the retaining wall 3 is reinforced by a jet grouting pile, the area of the excavated tunnel is driven into a fender pile 2, foundation pit excavation is carried out on the area in the fender pile 2, and tunnel construction is carried out after the excavation is finished; backfilling earthwork in the river channel, wherein the filling compaction degree is 0.96, removing the second-stage cofferdam, the retaining wall 3 and the double-U-shaped flow guide structure 1, and recovering the normal navigation of the river channel.

The cofferdam adopts Larsen steel sheet piles 4, the top width is 3m, the length of a single pile is 15m, high-pressure jet grouting piles are further arranged on the inner side of the cofferdam, the pile length is 15m, the water retaining effect is further achieved, anti-seepage geomembranes are paved on the near-water surface and the ground of the cofferdam, the distance from a second-stage area to a bank edge is increased by 3m, and in the second-stage excavation construction process, the fender piles 2 and the crown beams in the first stage are reserved.