Steel sheet pile supporting device and construction method thereof

Abstract

The invention relates to the technical field of civil engineering, in particular to a steel sheet pile supporting device. The steel sheet pile supporting device comprises a pile plate body, an enclosing purlin assembly and a steel pipe support, and the pile plate body is fixedly connected with the enclosing purlin assembly through a hanging piece; the enclosing purlin assembly comprises a front plate, a rear plate and I-shaped steel, the front plate and the rear plate are connected through at least two sets of first bolts, and the length of the first bolts is larger than the distance between the front plate and the rear plate. The I-shaped steel is inserted between the front plate and the rear plate, and the number of the I-shaped steel is 2-3; the steel pipe support is a steel pipe, the steel pipe support is connected with the front plate, at least two sets of first stiffening ribs are arranged at the end of the side, close to the front plate, of the steel pipe support, and the steel pipe support is in threaded connection with the supporting piece through the first bolt holes. According to the supporting device, the assembling procedure is greatly simplified, the connection between the steel pipe support and the enclosing purlin assembly is firmer and more reliable, the load effect under the full working conditions of supporting tension, pressing and the like can be effectively resisted, and the overall stability and the bearing capacity of the supporting device are further improved.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to a steel sheet pile support device and its construction method. Background Technology

[0002] With the development of the engineering field, the requirements for the cost and construction period of new projects are becoming increasingly stringent. In recent years, many cities have frequently experienced floods, making urban pipeline renovation projects urgent. These projects are typically located within urban areas, surrounded by residential buildings, with limited space and no conditions for large-scale slope construction; the pipelines are relatively small and shallow, resulting in narrow and shallow pipeline pits; the pipelines are long, involving different geological conditions and pit depths, leading to complex pit conditions. Based on relevant experience, steel sheet pile support is the most suitable foundation pit construction method for such projects, but current steel sheet pile support and construction methods still have significant drawbacks: 1) To prevent the sheet pile walers from sagging, supports or reinforcing bars need to be welded to the surface of the sheet piles. The welding process causes temperature stress damage to the sheet piles. At the same time, the sheet piles need to be cut off during dismantling, which affects their integrity, reduces the number of times they can be reused, and increases costs.

[0003] 2) Steel sheet pile walers are usually made of 2 to 3 H-beams welded together, with welded steel plates densely covering the surface. This means that multiple H-beams are welded to the steel plates as a whole, which affects subsequent recycling and will result in multiple full welds that cannot guarantee the construction period.

[0004] 3) To prevent the steel supports from falling, they are usually welded together with the steel walers mentioned above. During the dismantling process, they need to be chiseled or cut apart. Sometimes, for the sake of convenience during construction, the welds are usually sparse and not fully welded, which poses a safety risk.

[0005] 4) During the entire working process of the actual project, the support is under tension. At this time, the steel pipe and waler are very easy to fall off, which may cause engineering accidents and casualties.

[0006] Therefore, there is an urgent need for a steel sheet pile support device and its construction method to solve the above problems. Summary of the Invention

[0007] One of the objectives of this invention is to provide a sheet pile support device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A sheet pile support device includes a sheet pile body, a waler assembly, and a steel pipe brace. The sheet pile body is fixedly connected to the waler assembly via hangers. The waler assembly includes a front plate, a rear plate, and an I-beam. The front plate and the rear plate are connected by a first bolt. There are at least two sets of the first bolts, and the length of the first bolt is greater than the distance between the front plate and the rear plate. I-beams are inserted between the front and rear plates, and there are 2-3 I-beams. The I-beams include a top I-beam, which is set at the end of the pile sheet body near the ground outside the pit. The steel pipe support is made of steel pipe and is connected to the front plate. The end of the steel pipe support near the front plate is provided with a first stiffening rib and a first bolt hole. The front plate is provided with at least two sets of support members. The first stiffening rib is threadedly connected to the support member through the first bolt hole.

[0009] Furthermore, the pile plate body has an installation hole and a second bolt hole on the side near the ground outside the pit, and the distance between the installation hole and the edge of the pile plate body near the ground outside the pit is 50mm.

[0010] Furthermore, the hanger includes a hanging plate and a fork-shaped connecting end. The hanging plate is provided with a third bolt hole, and the fork-shaped connecting end includes two symmetrical connecting legs. Each connecting leg is provided with a fourth bolt hole at the end away from the hanging plate, and the axes of the fourth bolt holes are coaxial.

[0011] Furthermore, the mounting plate and the fork-shaped connecting end are connected by a locking key.

[0012] Furthermore, a second stiffening rib is provided on the surface of the top I-beam near the ground outside the pit. The second stiffening rib is provided with at least two fourth bolt holes, and the specifications of the fourth bolt holes are matched.

[0013] Furthermore, the second stiffening rib is fixedly connected to the hanger by the second bolt.

[0014] Furthermore, the support components include large support components and small support components, with a spacing of 3m between each group of large support components and each group of small support components.

[0015] The second objective of this application is to provide a construction method for the aforementioned steel sheet pile support device, comprising the following steps: Step S1: Calculate the specifications and quantity of components based on the actual site conditions and design drawings, and purchase or process the components, which include pile plates, walers and steel pipe supports. Step S2: Construct the main body of the pile slab according to the drawings and specifications, and assemble the waler components; Step S3: After completing the construction of the main pile plate, excavate the soil inside the foundation pit; Step S4: Lift the waler assembly to the designated position and install the hanging parts; Step S5: Install the steel pipe support onto the waler assembly through the first bolt hole; Step S6: Excavate the foundation pit to the designed bottom and carry out construction of the structures inside the foundation pit; Step S7: After the construction is completed, backfill the pit according to the design requirements. Then, in the order of installation, remove the steel pipe supports, waler components and hangers, and pull out the main body of the pile plate.

[0016] Furthermore, in step S3, the excavation depth of the soil inside the excavation pit is controlled at 0.3m below the center elevation of the first steel pipe support 3.

[0017] Furthermore, in step S7, the interior of the foundation pit is backfilled to a position 0.3m below the center elevation of the steel pipe support 3.

[0018] Compared with the prior art, the beneficial effects of the above-mentioned technical solution of the present invention are: 1) The front plate and the rear plate of this application are connected by the first bolt; the first stiffening rib of the steel pipe support is threadedly connected to the support of the front plate through the first bolt hole without welding; the main body of the pile sheet is connected to the waler assembly through the hanger, and the assembly method of hanger connection and bolt thread connection is adopted throughout the process, which greatly simplifies the assembly process, significantly improves the assembly efficiency of the entire steel sheet pile support device, realizes the rapid installation of the device, and further improves the safety and convenience of the assembly operation.

[0019] 2) The multiple sets of first bolts in this application can ensure the connection strength between the front plate and the rear plate, and avoid connection failure caused by overload of a single set of bolts; the first stiffening rib can enhance the structural rigidity of the end of the steel pipe support. With the threaded connection between at least two sets of support members and the first stiffening rib, the connection between the steel pipe support and the waler assembly is more firm and reliable. It can effectively resist the load under all working conditions such as tension and compression of the support, ensure that the force of the entire support device is reasonable and the force transmission path is clear, further improve the overall stability and bearing capacity of the support device, and ensure the structural safety during the construction of the foundation pit. Attached Figure Description

[0020] Figure 1 This is one of the schematic diagrams of the overall structure of the steel sheet pile support device of the present invention; Figure 2 This is the second schematic diagram of the overall structure of the steel sheet pile support device of the present invention; Figure 3 This is the third schematic diagram of the overall structure of the steel sheet pile support device of the present invention; Figure 4 This is a partially enlarged schematic diagram of the main body of the pile plate of the present invention; Figure 5 This is a front view of the front panel of the present invention; Figure 6 This is a schematic diagram of the structure of the top I-beam of the present invention; Figure 7 This is a partially enlarged schematic diagram of the top I-beam of the present invention; Figure 8This is a schematic diagram of the structure of the pendant of the present invention; Figure 9 This is a partial schematic diagram of the waler assembly of the present invention; Figure 10 This is a schematic diagram of the second bolt of the present invention; Tag name 1-Pile plate body; 11-Mounting hole; 12-Second bolt hole; 2-Walter assembly; 21-Front plate; 211-Support member; 2111-Large support member; 2112-Small support member; 22-Rear plate; 23-I-beam; 231-Top I-beam; 2314-Second stiffening rib; 24-First bolt; 3-Steel pipe brace; 31-First stiffening rib; 311-First bolt hole; 4-Hanger; 41-Hanging plate; 411-Third bolt hole; 42-Fork-shaped connecting end; 421-Connecting leg; 4211-Fourth bolt hole; 43-Locking key; 44-Second bolt. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 Please refer to Figure 1-10 To simplify, standardize, and expedite foundation pit support, and to reduce manufacturing costs, streamline construction processes, and shorten the construction period, this invention provides a steel sheet pile support device, which will be described in detail in this embodiment. It should be noted that this embodiment is not limited to the dimensions described in this design; the appropriate dimensions can be determined based on the actual project and construction site conditions, combined with factors such as hoisting and installation machinery. Specifically, this steel sheet pile support device includes a sheet pile body 1, a waler assembly 2, and a steel pipe support 3. The sheet pile body 1 is fixedly connected to the waler assembly 2 via a hanger 4. All components are made of Q235 steel. In this embodiment, the sheet pile body 1 has a thickness of 14mm, and the waler assembly 2, steel pipe support 3, and hanger 4 are all 10mm thick. The sheet pile body 1 can be a Larssen pile, channel steel, etc., which can be purchased on the market or fabricated by the construction party.

[0023] Furthermore, the waler assembly 2 includes a front plate 21, a rear plate 22, and I-beams 23. The front plate 21 and the rear plate 22 are connected by first bolts 24. There are at least two sets of first bolts 24, and the length of the first bolts 24 is greater than the distance between the front plate 21 and the rear plate 22. In this embodiment, the length of each waler assembly 2 is 6-8m. Each waler assembly 2 consists of one front plate 21, one rear plate 22, one top I-beam 231, and two I-beams 23. The front plate 21 and the rear plate 22 are fixed by multiple sets of first bolts 24. In this embodiment, the length of the first bolt 24 is 550mm. The lengths of the front plate 21 and the rear plate 22 can be set to 6-8 meters. Both are provided with multiple second bolt holes 12, and the positions and numbers of the second bolt holes 12 on the front plate 21 and the rear plate 22 correspond. Preferably, one set of second bolt holes 12 is provided every 1m between the front plate 21 and the rear plate 22, and each set of bolt holes 24 has 4 holes.

[0024] Furthermore, H-beams 23 are inserted between the front plate 21 and the rear plate 22, and there are 2-3 H-beams 23. Each H-beam 23 includes a top H-beam 231, which is located at the end of the pile body 1 closest to the ground outside the pit. Preferably, the front plate 21 and the H-beams 23 are installed with staggered joints, meaning the joints between the H-beams 23 and the front plate 21 do not overlap. Simultaneously, the upper and lower 2 or 3 H-beams 23 are also installed with staggered joints to ensure the continuity of the rigidity of the waler assembly 2. In this embodiment, the specifications of the H-beams 23 are 40b, 45b, or channel steel, etc. The top H-beam 231 is processed on-site or in the factory and is located at the top of the H-beams 23. Further details can be found in the following references. Figure 6 The top I-beam 231 has a second stiffening rib 2314 on the side surface closest to the ground outside the pit. In this embodiment, the top I-beam 231 has a second stiffening rib 2314 every 800mm. Furthermore, the second stiffening rib 2314 has at least two fourth bolt holes 23141. Furthermore, the second stiffening rib 2314 is fixedly connected to the hanger 4 by a second bolt 44. The other I-beams 23 are ordinary I-beams and do not require additional processing.

[0025] Furthermore, the steel pipe support 3 is a steel pipe, and in this embodiment, the steel pipe has a specification of 399x12mm. The steel pipe support 3 is connected to the front plate 21. The end of the steel pipe support 3 near the front plate 21 is provided with a first stiffening rib 31, which has a size of 50x130mm. The first stiffening rib 31 has two first bolt holes 311, which can be threadedly connected to the support member 211 on the waler assembly 2. The front plate 21 is provided with at least two sets of support members 211, and the first stiffening rib 31 is threadedly connected to the support member 211 through the first bolt holes 311. The steel pipe support 3 corresponds to the support member 211 on the front plate 21 through the reserved first stiffening rib 31 and the first stiffening rib 31 is above the support member 211. Then, short screws are immediately passed through the first bolt holes 311 and tightened with two nuts to ensure that the force path of the steel pipe support 3 and the waler assembly 2 is clear. When the steel pipe support 3 is under pressure, it is not easy for it to fall. However, under special working conditions such as backfill compaction and unilateral soil failure, the force on the steel pipe support 3 changes from compressive to tensile. In this example, since the steel pipe support 3 and the waler assembly 2 are bolted together, and the waler assembly 2 is connected to the pile plate body 1 through the hanger 4 and the corresponding bolts, the steel pipe support 3 or even the waler assembly 2 will not fall.

[0026] Preferably, the support member 211 includes a large support member 2111 and a small support member 2112, with a distance of 3m between each group of large support members 2111 and each group of small support members 2112. In this embodiment, the distance between two support members 211 in the same group of large support members 2111 or small support members 2112 is 720mm.

[0027] Furthermore, in this embodiment, the large support member 2111 is a 100x100mm steel plate, with one 60mm diameter lifting hole and two bolt holes. The small support member 2112 is a 100x50mm steel plate, with two bolt holes, the same spacing and diameter as the bolt holes on the large support member 2111. Through this design, after the waler assembly 2 is assembled, the waler assembly 2 can be lifted and installed using the lifting holes on the support member 211.

[0028] Furthermore, the pile plate body 1 is provided with an installation hole 11 and a second bolt hole 12 on the side near the ground outside the pit. The distance between the installation hole 11 and the edge of the pile plate body 1 near the ground outside the pit is 50mm.

[0029] Furthermore, the hanger 4 is a factory-prefabricated component, including a hanging plate 41 and a fork-shaped connecting end 42. The hanging plate 41 is U-shaped, with dimensions of 80 x 80 mm. A third bolt hole 411 is provided on the hanging plate 41, corresponding to the second bolt hole 12 on the pile plate body 1. The fork-shaped connecting end 42 includes two symmetrical connecting legs 421. Each connecting leg 421 has a fourth bolt hole 4211 at its end away from the hanging plate 41. The axes of the two fourth bolt holes 4211 are coaxial. The opening here is larger than ordinary bolt holes, facilitating non-aligned installation. The hanger 4 is passed through the mounting hole 11 of the pile plate body 1, and automatically locks under gravity. To ensure the component is locked, after the hanger 4 is installed, short screws should be inserted into the first bolt hole 311 and the third bolt hole 411, and the nuts should be tightened. It should be noted that the short screws described below in this embodiment are all 12 mm in length and 10 mm in diameter. The lower part of the hanging plate 41 is a locking key 43 with a gradually changing cross section. The locking key 43 is gradually changed from an 80mm steel plate to a parallel bolt key. The hanging plate 41 and the fork-shaped connecting end 42 are connected by the locking key 43.

[0030] Furthermore, the sheet pile body 1 is connected to the waler assembly 2 via a hanger 4. The upper hanging plate 41 of the hanger 4 aligns with the mounting hole 11 of the sheet pile body 1 and engages downwards, secured with short screws and nuts. The lower locking key 43 of the hanger 4 aligns with a bolt hole 332 on the stiffening rib 331 of the top I-beam 231 of the waler assembly 2, and is then secured with short screws and nuts, ensuring that the waler assembly 2 does not sag.

[0031] Based on the stress characteristics of the foundation pit, the pile-slab body 1 experiences the greatest stress within the range from the foundation pit support to the bottom slab, while the top of the support piles is close to the ground and experiences virtually no stress. However, in actual construction, to prevent surface water and rainwater from flowing into the foundation pit, the top of the pile-slab body 1 usually extends 300mm beyond the ground. The protruding pile-slab body 1, besides its water-blocking function, is completely unloaded. Therefore, the mounting hole 11 and the second bolt hole 12 are placed in this area to fully utilize the strength of the pile-slab body 1.

[0032] During construction, all connections are mechanical, without welding, which greatly improves installation efficiency. The installation is convenient, the connection is reliable, and the component connections are flexible and adaptable, making it suitable for various double and triple walers.

[0033] Example 2 The second objective of this application is to provide a construction method for the aforementioned steel sheet pile support device, comprising the following steps: Step S1: Calculate the specifications and quantity of components based on the actual site conditions and design drawings, and purchase or process the components, which include pile plates, walers and steel pipe supports 3. Step S2: Construct the main body of the pile plate 1 according to the drawings and specifications, and assemble the waler assembly 2; Step S3: After completing the construction of the main pile plate 1, excavate the soil inside the foundation pit; Step S4: Lift the waler assembly 2 to the designated position and install the hanger 4; Step S5: Install the steel pipe support 3 onto the waler assembly 2 through the first bolt hole 311; Step S6: Excavate the foundation pit to the designed bottom and carry out construction of the structures inside the foundation pit; Step S7: After the construction is completed, backfill the pit according to the design requirements. Then, in the order of installation, remove the steel pipe support 3, the waler assembly 2 and the hanger 4, and pull out the pile plate body 1.

[0034] Furthermore, in step S3, the excavation depth of the soil inside the excavation pit is controlled at 0.3m below the center elevation of the first steel pipe support 3.

[0035] Furthermore, in step S7, the interior of the foundation pit is backfilled to a position 0.3m below the center elevation of the steel pipe support 3.

[0036] The construction method of this embodiment controls the height by 0.3m below the center elevation of the steel pipe support 3, which unifies the working conditions for support installation and dismantling, making installation convenient and dismantling safe. It ensures that the steel pipe support 3 always works within a reasonable stress range, effectively limiting the displacement of the foundation pit and improving the safety and stability of the support system. The steel pipe support 3, waler component 2, and hanger 4 all adopt a prefabricated and detachable structure, which can be reused and reduce costs.

[0037] Other differences from Example 1 will not be repeated in this example.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sheet pile support device, comprising a sheet pile body (1), a waler assembly (2), and a steel pipe brace (3), characterized in that, The pile plate body (1) is fixedly connected to the waler assembly (2) by a hanger (4); The waler assembly (2) includes a front plate (21), a rear plate (22) and an I-beam (23). The front plate (21) and the rear plate (22) are connected by a first bolt (24). There are at least two sets of the first bolt (24), and the length of the first bolt (24) is greater than the distance between the front plate (21) and the rear plate (22). The I-beams (23) are inserted between the front plate (21) and the rear plate (22), and there are 2-3 I-beams (23). The I-beams (23) include a top I-beam (231), which is located at one end of the pile plate body (1) near the ground outside the pit. The steel pipe support (3) is a steel pipe, and the steel pipe support (3) is connected to the front plate (21). The end of the steel pipe support (3) near the front plate (21) is provided with a first stiffening rib (31). The first stiffening rib (31) is provided with a first bolt hole (311). The front plate (21) is provided with at least two sets of support members (211). The first stiffening rib (31) is threadedly connected to the support member (211) through the first bolt hole (311).

2. The sheet pile support device according to claim 1, characterized in that, The pile plate body (1) is provided with an installation hole (11) and a second bolt hole (12) on the side near the ground outside the pit. The distance between the installation hole (11) and the edge of the pile plate body (1) near the ground outside the pit is 50mm.

3. The sheet pile support device according to claim 1, characterized in that, The hanger (4) includes a hanging plate (41) and a fork-shaped connecting end (42). The hanging plate (41) is provided with a third bolt hole (411). The fork-shaped connecting end (42) includes two symmetrical connecting legs (421). Each connecting leg (421) is provided with a fourth bolt hole (4211) at the end away from the hanging plate (41). The axes of the fourth bolt holes (4211) are coaxial.

4. The sheet pile support device according to claim 3, characterized in that, The mounting plate (41) and the fork-shaped connecting end (42) are connected by a locking key (43).

5. The sheet pile support device according to claim 3, characterized in that, The top I-beam (231) has a second stiffening rib (2314) on the side surface near the ground outside the pit. The second stiffening rib (2314) has at least two fourth bolt holes (23141), and the specifications of the fourth bolt holes (23141) match those of the fourth bolt holes (4211).

6. The sheet pile support device according to claim 5, characterized in that, The second stiffening rib (2314) is fixedly connected to the hanger (4) by the second bolt (44).

7. The sheet pile support device according to claim 1, characterized in that, The support member (211) includes a large support member (2111) and a small support member (2112), and the distance between each group of large support members (2111) and each group of small support members (2112) is 3m.

8. A construction method for a steel sheet pile support device as described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Calculate the specifications and quantity of components based on the actual site conditions and design drawings, and purchase or process the components, which include pile plates, walers and steel pipe supports. Step S2: Construct the main body of the pile plate (1) according to the drawings and specifications, and assemble the waler components (2); Step S3: After completing the construction of the pile plate body (1), excavate the soil inside the foundation pit; Step S4: Lift the waler assembly (2) to the designated position and install the hanger (4); Step S5: Install the steel pipe support (3) onto the waler assembly (2) through the first bolt hole (311); Step S6: Excavate the foundation pit to the designed bottom and carry out construction of the structures inside the foundation pit; Step S7: After the construction is completed, backfill the pit according to the design requirements. Then, in the order of installation, remove the steel pipe support (3), the waler assembly (2) and the hanger (4), and pull out the pile plate body (1).

9. The construction method of the steel sheet pile support device according to claim 8, characterized in that, In step S3, the excavation depth of the soil inside the excavation pit is controlled at a position 0.3m below the center elevation of the first steel pipe support (3).

10. The construction method of the steel sheet pile support device according to claim 8, characterized in that, In step S7, the pit is backfilled to a position 0.3m below the center elevation of the steel pipe support (3).

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