Jetty structure and construction method thereof

Abstract

This invention discloses a guide embankment structure, comprising a superstructure and two rows of foundation sheet piles. The superstructure is composed of multiple arched bodies, each arched body including a semi-cylindrical body and a crossbeam. The crossbeam includes two longitudinal ribs and two transverse ribs. Two node holes are vertically formed at the midpoint of the width of each of the two longitudinal ribs. Inner and outer vertical ribs extend downwards from the bottom surfaces of the two longitudinal ribs, one inside and one outside the node holes, respectively. Each arched body rests on the riverbed surface via the inner and outer vertical ribs. Each row of foundation sheet piles is composed of multiple sheet pile units, each sheet pile unit including two irregularly shaped sheet piles and several conventional sheet piles. The tops of the two irregularly shaped sheet piles are inserted into the two node holes, forming a node cavity between the top of each irregularly shaped sheet pile and the wall of the corresponding node hole. Several conventional sheet piles are inserted between the inner and outer vertical ribs, forming an interrib cavity between the inner and outer vertical ribs and the foundation sheet piles. Fine aggregate concrete is poured into both the node cavities and the interrib cavities. This invention effectively improves structural stability.

Description

Technical Field

[0001] This invention relates to a guide embankment structure and its construction method. Background Technology

[0002] Guide dikes can guide and change the direction of water flow, reduce siltation, and maintain channel depth. Guide dikes are often constructed using riprap sloping dikes or geotextile-filled bag-core sloping dikes. Sloping dikes are simple in structure, easy to construct, and have high overall stability, suitable for various foundations, and can utilize locally sourced materials. However, they consume a large amount of material (almost proportional to the square of the water depth), and are generally suitable for shallower waters with abundant stone resources. When the surface soil is poor, foundation reinforcement measures such as plastic drainage boards are often required. In estuaries with large waves and open water surfaces, other structures are also used, such as the reinforced concrete semi-circular structure and hollow tetrahedral structure of the Yangtze River estuary guide dikes. Due to environmental factors such as wave impact and water erosion, guide dike structures are prone to damage to their facing or bottom protection structures, requiring frequent maintenance. Many damaged guide dikes cannot be repaired promptly, and some structures present difficulties in maintenance.

[0003] The existing guide dike structures all have their superstructures directly resting on the riverbed surface, with protective stones installed on both sides of the dike. No structures are placed below the mud surface, and there is no connection between the upper and lower structures. If a lower structure were installed below the mud surface, the external loads borne by the guide dike would first act on the upper structure and then be transferred to the lower structure, thus shifting the load influence downwards to the depths of the soil. Therefore, a stable connection between the upper and lower structures is crucial.

[0004] Conventional double-row sheet pile structures use underwater cofferdams or support structures to create a dry construction environment for in-situ casting of joints. However, creating a dry construction environment will significantly increase the construction procedures and costs. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art and provide a guide embankment structure and its construction method, which can effectively improve the structural stability during use, enhance the resistance to soil softening and mud erosion, and significantly reduce construction procedures and costs.

[0006] One technical solution to achieve the objective of this invention is: a guide embankment structure, comprising a superstructure and two rows of foundation sheet piles; wherein, The superstructure is composed of multiple arched bodies. Each arched body includes a semi-cylindrical body and a crossbeam connected to the bottom surface of the semi-cylindrical body. The width of the crossbeam is greater than the outer diameter of the semi-cylindrical body. The crossbeam has a plane of II and includes two longitudinal ribs located at the two transverse ends of the crossbeam and two transverse ribs spanning between the inner surfaces of the two longitudinal ribs. Two node holes extending through to the top surface of the longitudinal ribs are opened longitudinally at intervals in the middle of the bottom surface of each of the two longitudinal ribs. An inner vertical rib and an outer vertical rib extend downward from the bottom surface of the two longitudinal ribs, corresponding to the inner and outer sides of the node holes. Each arched body rests on the riverbed surface through the inner and outer vertical ribs on the two longitudinal ribs. The spacing between the two rows of foundation sheet piles is adapted to the spacing of the node holes on the two longitudinal ribs of the arch; each row of foundation sheet piles is composed of multiple sheet pile units spliced ​​together, and each sheet pile unit includes two irregular sheet piles and several regular sheet piles; the top elevation of the irregular sheet piles is higher than the top elevation of the regular sheet piles; the tops of the two irregular sheet piles, which are higher than the regular sheet piles, are inserted one-to-one into the two node holes of one longitudinal rib of each semi-cylinder, so that the top of each irregular sheet pile and the hole wall of the corresponding node hole form a node cavity; several regular sheet piles are inserted between the inner and outer vertical ribs of one longitudinal rib of each semi-cylinder and located between the two irregular sheet piles and at both ends of the longitudinal direction of the two irregular sheet piles, and the longitudinal end faces of the regular sheet piles and the longitudinal end faces of the irregular sheet piles are connected by mortise and tenon joints, so that the inner vertical rib and the foundation sheet pile and the outer vertical rib and the foundation sheet pile form an interrib cavity. Fine aggregate concrete was poured into both the node cavity and the interrib cavity.

[0007] The aforementioned guide embankment structure includes a conventional sheet pile with lateral limiting edges protruding from both sides of the top and a shaped head integrally set at the top of the conventional sheet pile. The shaped head is a truncated pyramid with a smaller top and a larger bottom, and the height of the shaped head is adapted to the thickness of the longitudinal rib of the arch. The cross-section of the node hole is also a truncated pyramid with a smaller top and a larger bottom, adapted to the shaped head of the shaped sheet pile, and the inner wall surface of the node hole is a non-smooth surface.

[0008] In the aforementioned guide embankment structure, the top two sides, the inner side of the inner vertical rib, and the inner side of the outer vertical rib of the conventional sheet pile are uneven, non-smooth surfaces; In the aforementioned guide embankment structure, the riverbed surface is leveled by riprap at the positions of the two longitudinal ribs corresponding to the superstructure.

[0009] Another technical solution to achieve the objective of this invention is: a construction method for a guide dike, based on the guide dike structure of this invention, the construction method comprising the following steps: S1. Precast reinforced concrete foundation sheet piles and the arched structure of the superstructure; S2. The riverbed surface is leveled by riprap at the positions of the two longitudinal ribs of the superstructure; S3. Transport the foundation sheet piles to the site by ship and drive the foundation sheet piles; use the mortise and tenon joints between the longitudinal end faces of conventional sheet piles and between the longitudinal end faces of conventional sheet piles and the longitudinal end faces of irregular sheet piles to form a row of foundation sheet piles; during the driving of irregular sheet piles, set a positioning guide rod at the top of the irregular sheet piles. S4. After both rows of foundation sheet piles are driven into place, the arch of the superstructure is hoisted; guided by the positioning guide rod temporarily set at the top of the irregular sheet pile, each arch is accurately placed on the top of the two rows of foundation sheet piles, and under the action of its own weight, the inner and outer vertical ribs on both sides of the arch form a closed cavity between the riprap and the inner and outer vertical ribs on both sides of the arch. S5. Fine aggregate concrete is poured into the interrib cavity and the node cavity, using the method of pouring from the lower hole and overflowing from the upper hole to ensure the filling degree; after the fine aggregate concrete reaches the required strength, an integral structure is formed between the sheet piles and between the sheet piles and the arch. S6. Installation of auxiliary components of the guide embankment.

[0010] The guide embankment structure and its construction method of the present invention have the following characteristics: 1) By utilizing longitudinal tongue and groove joints along the entire length, concrete foundation sheet piles are connected into a whole wall, improving the connection effect of the sheet pile wall. 2) By designing the nodes between the inner and outer vertical ribs of the superstructure and the foundation sheet piles, as well as between the node holes of the superstructure and the irregular sheet piles, each row of foundation sheet piles and the two rows of foundation sheet piles and the superstructure are connected into a whole. The load borne by the superstructure is transferred to the two rows of foundation sheet piles and the surrounding soil through the nodes, thereby improving the performance of the guide embankment structure in resisting soil softening and mud erosion. 3) With the nodes of the present invention, there is no need to use underwater cofferdams or support structures, and the nodes can be poured underwater, which greatly reduces the construction procedures and construction costs. 4) The guide embankment structure constructed using the construction method of this invention has good adaptability to soft soil foundations, eliminating the need for foundation treatment and reducing engineering construction costs. Attached Figure Description

[0011] Figure 1 This is a plan view of the guide embankment structure of the present invention; Figure 2 This is a cross-sectional view of the arched body in the guide embankment structure of the present invention; Figure 3 This is a side view of the guide embankment structure of the present invention; Figure 4 yes Figure 3 AA direction view in the middle; Figure 5 yes Figure 3 BB view in the middle; Figure 6yes Figure 4 Enlarged view of the P region. Detailed Implementation

[0012] The invention will now be further described with reference to the accompanying drawings.

[0013] Please refer to Figures 1 to 6 The guide embankment structure of the present invention includes a superstructure and two rows of foundation sheet piles 200.

[0014] The superstructure is composed of multiple arched bodies 100 spliced ​​together. Each arched body 100 includes a semi-cylindrical body 10A and a crossbeam 10B connected to the bottom surface of the semi-cylindrical body 10A. The width of the crossbeam 10B is greater than the outer diameter of the semi-cylindrical body 10A. The crossbeam 10B has a planar shape of II and includes two longitudinal ribs 11 located at the transverse ends of the crossbeam 10B in a one-to-one correspondence and two transverse ribs 12 spanning between the inner surfaces of the two longitudinal ribs 11. Two node holes 13 are longitudinally spaced at the middle of the width of the bottom surface of each of the two longitudinal ribs 11, extending to the top surface of the longitudinal rib 11. The cross-section of the node hole 13 is a tapered hole with a smaller top and a larger bottom, and the inner wall surface of the node hole 13 is an uneven, non-smooth surface. The bottom surfaces of the two longitudinal ribs 11 extend downwards from the inner and outer sides of the node hole 13, respectively, with an inner vertical rib 14 and an outer vertical rib 15. The inner surfaces of the inner vertical rib 14 and the outer vertical rib 15 are uneven, non-smooth surfaces. Each arch 100 rests on the riverbed surface through the inner vertical rib 14 and the outer vertical rib 15 on the two longitudinal ribs 11. The riverbed surface is leveled by riprap at the positions of the two longitudinal ribs 11 corresponding to the superstructure.

[0015] The spacing between the two rows of foundation sheet piles 200 is adapted to the spacing of the node holes 13 on the two longitudinal ribs 11 of the arch 100; each row of foundation sheet piles 200 is composed of multiple sheet pile units spliced ​​together, each sheet pile unit including two irregular sheet piles 21 and several conventional sheet piles 22; the top elevation of the irregular sheet piles 21 is higher than the top elevation of the conventional sheet piles 22; the irregular sheet piles 21 include conventional sheet piles with lateral limiting edges protruding on both sides of the top and an irregular head 210 integrally set at the top of the conventional sheet piles; the irregular head 210 is a truncated pyramid with a smaller top and a larger bottom, adapted to the node holes 13 on the arch 100, and the height of the irregular head 210 is adapted to the thickness of the longitudinal ribs 11 of the arch 100; the irregular heads 210 of the two irregular sheet piles 21 are inserted one-to-one into one of the longitudinal ribs 11 of each semi-cylindrical body 100. The insertion of the irregular sheet pile 21 is restricted by the limiting edge in the two node holes 13, so that the irregular head 210 of each irregular sheet pile 21 and the hole wall of the corresponding node hole 13 form a node cavity 301; several conventional sheet piles 22 are inserted between the inner vertical rib 14 and the outer vertical rib 15 of a longitudinal rib 11 of each semi-cylinder 100 and are located between the two irregular sheet piles 21 and at both ends of the longitudinal direction of the two irregular sheet piles 21. The longitudinal end faces of the conventional sheet piles 22 and the longitudinal end faces of the conventional sheet piles 22 and the longitudinal end faces of the irregular sheet piles 21 are connected by mortise and tenon joints, so that the inner vertical rib 14 and the foundation sheet pile 200 and the outer vertical rib 15 and the foundation sheet pile 200 form an interrib cavity 302; the top two sides of the conventional sheet pile 21 are uneven and non-smooth surfaces. Fine aggregate concrete was poured into both the node cavity 301 and the interrib cavity 302.

[0016] The guide dike structure of the present invention, through node connection, transfers the upper load on the arch body to the relatively deep soil, greatly increasing its adaptability to soil softening and mud erosion, thereby effectively improving the structural stability of the guide dike during its use.

[0017] The guide embankment structure of this invention uses longitudinal mortise and tenon joints along its entire length to connect concrete foundation sheet piles into a whole wall, improving the connection effect of the sheet pile wall. Fine aggregate concrete is poured into the rib cavity between the vertical ribs and the riprap layer, and the node cavity of the top node of the irregular sheet pile. After the fine aggregate concrete reaches its strength, it forms a whole, thereby improving the guide embankment structure's resistance to soil softening and mud erosion, and significantly reducing construction procedures and costs.

[0018] The construction method of the guide embankment of the present invention, based on the guide embankment structure of the present invention, includes the following steps: S1. Precast reinforced concrete foundation sheet piles 200 and the arched body 100 of the superstructure; S2. Level the riverbed surface at the positions corresponding to the two longitudinal ribs 11 of the superstructure using 300mm riprap. S3. The foundation sheet piles 200 are transported to the site by ship and driven into place. The longitudinal end faces of the conventional sheet piles 22 and the longitudinal end faces of the conventional sheet piles 22 and the longitudinal end faces of the irregular sheet piles 21 are connected to form a row of foundation sheet piles 200. In order to improve the convenience of the installation of the arch 100, a positioning guide rod 23 can be inserted and removed at the top of the irregular sheet piles 21 during the driving process. The two rows of foundation sheet piles 200 can be constructed simultaneously. S4. After both rows of foundation sheet piles 200 are driven into place, the arch 100 of the superstructure is hoisted. Guided by the positioning guide rod 23 temporarily fixed on the irregular sheet pile 21, each arch 100 is precisely placed on top of the two rows of foundation sheet piles 200. Under its own weight, the inner vertical rib 14 and outer vertical rib 15 on both sides of the arch 100 form a closed cavity with the riprap 300, creating conditions for the joint pouring. Then the positioning guide rod 23 on the irregular sheet pile 21 is removed. S5. Fine aggregate concrete is poured into the interrib cavity 302 and the node cavity 301, using the method of pouring from the lower hole and overflowing from the upper hole to ensure the filling degree; the inner wall surface of the node hole 13 is an uneven non-smooth surface, the top two sides of the conventional sheet pile 21 are uneven non-smooth surfaces, and the inner side surface of the inner vertical rib 14 and the inner side surface of the outer vertical rib 15 are all uneven non-smooth surfaces, which can improve the connection effect between the fine aggregate concrete and the precast components. After the strength of the fine aggregate concrete reaches the requirements, an integral structure is formed between the foundation sheet piles 200 and between the foundation sheet piles 200 and the arch 100. S6. Installation of auxiliary components of the guide dike, such as hanging anti-collision devices on the water-facing side of the guide dike. Anti-collision devices can be made from old tires, etc.

[0019] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of the invention and should be defined by the claims.

Claims

1. A guide embankment structure, comprising a superstructure and two rows of foundation sheet piles; characterized in that, The superstructure is composed of multiple arched bodies. Each arched body includes a semi-cylindrical body and a crossbeam connected to the bottom surface of the semi-cylindrical body. The width of the crossbeam is greater than the outer diameter of the semi-cylindrical body. The crossbeam has a plane of II and includes two longitudinal ribs located at the two transverse ends of the crossbeam and two transverse ribs spanning between the inner surfaces of the two longitudinal ribs. Two node holes extending through to the top surface of the longitudinal ribs are opened longitudinally at intervals in the middle of the bottom surface of each of the two longitudinal ribs. An inner vertical rib and an outer vertical rib extend downward from the bottom surface of the two longitudinal ribs, corresponding to the inner and outer sides of the node holes. Each arched body rests on the riverbed surface through the inner and outer vertical ribs on the two longitudinal ribs. The spacing between the two rows of foundation sheet piles is adapted to the spacing of the node holes on the two longitudinal ribs of the arch; each row of foundation sheet piles is spliced ​​together from multiple sheet pile units, and each sheet pile unit includes two irregular sheet piles and several regular sheet piles; the top elevation of the irregular sheet piles is higher than the top elevation of the regular sheet piles; the tops of the two irregular sheet piles, which are higher than the regular sheet piles, are inserted into the two node holes of one longitudinal rib of each semi-cylinder, so that a node cavity is formed between the top of each irregular sheet pile and the hole wall of the corresponding node hole. Several conventional sheet piles are inserted between the inner and outer vertical ribs of one longitudinal rib of each semi-cylinder and located between two irregular sheet piles and at both ends of the longitudinal direction of the two irregular sheet piles. The longitudinal end faces of the conventional sheet piles and the longitudinal end faces of the conventional sheet piles and the longitudinal end faces of the irregular sheet piles are connected by mortise and tenon joints, so that the inner vertical ribs and the foundation sheet piles and the outer vertical ribs and the foundation sheet piles form interrib cavities. Fine aggregate concrete was poured into both the node cavity and the interrib cavity.

2. The jetty structure according to claim 1, characterized in that The irregular sheet pile includes a conventional sheet pile with limiting edges protruding on both sides of the top and an irregular head integrally set on the top of the conventional sheet pile; the irregular head is a truncated pyramid with a smaller top and a larger bottom, and the height of the irregular head is adapted to the thickness of the longitudinal rib of the arch; the cross section of the node hole is also a truncated pyramid with a smaller top and a larger bottom, adapted to the irregular head of the irregular sheet pile, and the inner wall surface of the node hole is a non-smooth surface.

3. The jetty structure of claim 1, wherein, The top two sides, the inner side of the inner vertical rib, and the inner side of the outer vertical rib of the conventional sheet pile are uneven, non-smooth surfaces.

4. The jetty structure of claim 1, wherein, The riverbed surface is leveled by pebbling at the positions of the two longitudinal ribs corresponding to the superstructure.

5. A method of constructing a breakwater based on the breakwater structure according to claim 1, characterized in that, The construction method includes the following steps: S1. Precast reinforced concrete foundation sheet piles and the arched structure of the superstructure; S2. The riverbed surface is leveled by riprap at the positions of the two longitudinal ribs of the superstructure; S3. Transport the foundation sheet piles to the site by ship and drive the foundation sheet piles; use the mortise and tenon joints between the longitudinal end faces of conventional sheet piles and between the longitudinal end faces of conventional sheet piles and the longitudinal end faces of irregular sheet piles to form a row of foundation sheet piles; during the driving of irregular sheet piles, set a positioning guide rod at the top of the irregular sheet piles. S4. After both rows of foundation sheet piles are driven into place, the arch of the superstructure is hoisted; guided by the positioning guide rod temporarily set at the top of the irregular sheet pile, each arch is accurately placed on the top of the two rows of foundation sheet piles, and under the action of its own weight, the inner and outer vertical ribs on both sides of the arch form a closed cavity between the riprap and the inner and outer vertical ribs on both sides of the arch. S5. Fine aggregate concrete is poured into the interrib cavity and the node cavity, using the method of pouring from the lower hole and overflowing from the upper hole to ensure the filling degree; after the fine aggregate concrete reaches the required strength, an integral structure is formed between the sheet piles and between the sheet piles and the arch. S6. Installation of auxiliary components of the guide embankment.

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