Combined structure of Larsen steel sheet pile and H-shaped steel for supporting foundation pit
By setting interlocking structures and guiding components on Larssen sheet piles and H-beams, the problems of torsion deformation and water seepage of Larssen sheet piles when driven into the ground were solved, thus achieving stability and sealing of the foundation pit support.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-04-03
AI Technical Summary
Larssen sheet piles are prone to twisting and deformation when driven into the ground, resulting in large gaps in the continuously formed sheet pile wall, causing water seepage and leakage. They are also difficult to fit tightly with H-beams, affecting the support strength.
The structure adopts a combination of Larssen sheet piles and H-beams for foundation pit support. Right-angle clamps, interlocking parts and guide components are set on the Larssen sheet piles, and support plates and guide parts are set on the H-beams. The pile caps and bolts are used for connection to ensure verticality and sealing.
It improves the stiffness of Larssen sheet piles and the verticality of H-beam insertion, avoids torsion and deformation, forms a water-stop groove to achieve sealing, enhances the support effect, and prevents leakage.
Smart Images
Figure CN224078185U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of foundation pit support structure technology, and in particular to a combined structure of Larssen sheet piles and H-beams for foundation pit support. Background Technology
[0002] Larssen sheet piles, also known as U-shaped sheet piles, play a vital role in engineering projects as retaining walls, water barriers, and sand barriers during bridge cofferdam construction, large pipeline laying, and temporary ditch excavation. They are also used as retaining walls, embankment protection walls, and revetment walls in docks and unloading yards. Using Larssen sheet piles for cofferdams is not only environmentally friendly but also offers fast construction speed and low cost, along with excellent waterproofing. However, the driving of Larssen sheet piles and H-beams requires high precision. Poor pile positioning and verticality control can negatively impact the overall support effect. In complex geological conditions, problems such as pile tilting and loose fit between the H-beams and sheet piles can easily occur. Solutions include conducting detailed geological surveys before construction, developing a reasonable construction plan based on the geological conditions, and using advanced measuring instruments and positioning equipment, such as total stations. During construction, strict control of pile position and verticality is crucial, with measurements and corrections performed at regular depths.
[0003] Currently, Larssen sheet piles are prone to twisting and deformation when driven into the ground, resulting in large gaps in the continuously formed sheet pile wall. This leads to water seepage and leakage in the formed continuous wall, and also makes it difficult to fit tightly with H-beams, affecting the support strength of the sheet pile continuous wall. Utility Model Content
[0004] The purpose of this utility model is to solve the problems in the prior art where Larssen sheet piles are prone to twisting and deformation when driven into the ground, resulting in large gaps in the continuously formed sheet pile wall, leading to water seepage and leakage in the formed continuous wall, and also making it difficult to fit tightly with H-beams, affecting the support strength of the sheet pile continuous wall. The proposed utility model is a combination structure of Larssen sheet piles and H-beams for foundation pit support.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A combined structure of Larssen sheet piles and H-beams for foundation pit support, including Larssen sheet piles, wherein two right-angle clamps are fixedly connected to one side of the Larssen sheet piles, the two right-angle clamps together form a clamping part, and both ends of the Larssen sheet piles are vertically provided with interlocking parts;
[0007] H-beam, one of the flanges of the H-beam is attached to one side of the Larssen sheet pile and engaged with the snap-fit part;
[0008] The pile cap is provided with two snap-fit grooves that are identical to the structure of the upper and lower ends of the Larssen sheet pile. The two snap-fit grooves are used to connect adjacent Larssen sheet piles at the upper and lower positions.
[0009] A guide assembly, which consists of multiple guide plates, which are symmetrically fixed to the lower end of the Larssen sheet pile.
[0010] Preferably, the pile cap consists of a fixing plate and two back plates. A limiting strip is fixedly connected to the middle part of one side of each of the two back plates. The back plates are fixedly connected to one side of the fixing plate through the limiting strip, and the limiting strip separates the fixing plate and the back plates into two snap-fit grooves.
[0011] Preferably, the back plate has multiple countersunk holes on its sidewall, and bolts are fitted into each of the countersunk holes. The fixing plate has multiple threaded holes on its sidewall, and the bolts are threaded into the threaded holes. The upper and lower ends of the Larssen sheet pile have through holes that match the countersunk holes and threaded holes.
[0012] Preferably, the upper end of the pile cap has multiple notches, and the multiple notches are respectively engaged with multiple guide plates of the guide assembly.
[0013] Preferably, a plurality of support plates are fixedly connected between the two flanges of the H-beam, and the plurality of support plates are parallel to the web of the H-beam and perpendicular to the flanges of the H-beam.
[0014] Preferably, the upper end of the H-beam is provided with a V-groove, and the lower end of the H-beam is provided with a V-shaped guide portion.
[0015] Preferably, the Larssen sheet pile consists of a base plate and two waist plates, and the whole structure is U-shaped. The angle between the waist plate and the base plate is 120°. The interlocking part is formed by bending it integrally with the waist plate using a bending process. The interlocking part is a planar structure and the angle between it and the base plate is 90°.
[0016] Preferably, the two interlocking portions on the Larssen sheet pile have a width difference, and after two adjacent Larssen sheet piles interlock, a water-stop groove is formed by the width difference of the interlocking portions.
[0017] Compared with the prior art, this utility model provides a combined structure of Larssen sheet piles and H-beams for foundation pit support, which has the following beneficial effects:
[0018] 1. By reinforcing and improving the traditional H-beam, multiple support plates are welded between the two flanges of the H-beam, which can effectively increase the strength of the flanges. At the same time, the support plates parallel to the web can play a guiding role when inserted into the ground, ensuring the verticality of the H-beam when inserted into the ground.
[0019] 2. By setting interlocking parts perpendicular to the base plate at both ends of the Larssen sheet pile, a larger accommodation space can be provided between the interlocking parts and the adjacent interlocking parts when inserted into the ground, avoiding jamming with adjacent Larssen sheet piles. Furthermore, by using interlocking parts of different lengths, a water-stop groove can be formed between the two interlocking parts, and grouting treatment can be carried out in the water-stop groove to achieve the sealing between two adjacent Larssen sheet piles, avoiding serious leakage during later use.
[0020] 3. Bolts can be used to connect two Larssen sheet piles at different positions. In addition, the installation of end caps can improve the bearing capacity of the upper end of the Larssen sheet pile and prevent its end from deforming after being impacted when inserted into the ground.
[0021] The parts not covered in this device are the same as or can be implemented using existing technology. This utility model can effectively improve the stiffness of Larssen sheet piles, enabling Larssen sheet piles and H-beams to be stably inserted into the ground, effectively avoiding twisting deformation of Larssen sheet piles during the insertion of the soil, thus adapting to the construction needs of longer Larssen sheet piles. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model.
[0023] Figure 2 This is an exploded view of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model;
[0024] Figure 3 This is a schematic diagram of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model.
[0025] Figure 4 This is an exploded view of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model;
[0026] Figure 5 This is a schematic diagram of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model.
[0027] Figure 6 This is an exploded view of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model;
[0028] Figure 7 This is a schematic diagram of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model.
[0029] Figure 8 This is an exploded view of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model;
[0030] Figure 9 This is a schematic diagram of the combined structure of Larssen sheet piles and H-beams for foundation pit support proposed in this utility model.
[0031] In the diagram: 1. Larssen sheet pile; 2. H-beam; 3. Pile cap; 4. Guide plate; 5. Notch; 6. Support plate; 7. V-shaped guide part; 8. Fixing plate; 9. V-groove; 10. Right-angle retaining strip; 11. Limiting strip; 12. Back plate; 13. Snap-fit groove; 14. Water-stop groove; 15. Interlocking part. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0033] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] Reference Figure 1-9 The key technical feature of this utility model is that the integrally bent Larssen sheet pile 1 consists of a base plate and two waist plates, forming a U-shaped structure. The angle between the waist plates and the base plate is 120°. Two right-angle clips 10 are fixedly connected to one side of the Larssen sheet pile 1, forming a snap-fit joint. Both ends of the Larssen sheet pile 1 have vertically arranged interlocking parts 15, which are integrally bent with the waist plates using a bending process. The interlocking parts 15 are planar structures with a 90° angle to the base plate. The two interlocking parts 15 on the bent Larssen sheet pile 1 have a width difference, controlled within the range of 3-5 cm. After two adjacent Larssen sheet piles 1 interlock, a water-stop groove 14 is formed through the width difference of the interlocking parts 15. The width of the water-stop groove 14 is the thickness of the Larssen sheet pile 1, and its length is the height difference between the two interlocking parts 15. Figure 1 and Figure 2As shown, a guide assembly is installed at the lower end of the Larssen sheet pile 1. The guide assembly consists of multiple guide plates 4, which are symmetrically fixed at the lower end of the Larssen sheet pile 1. The guide plates 4 are perpendicular to the floor of the Larssen sheet pile 1. When inserted into the ground, the guide plates 4 can provide sufficient friction between the guide plates and the soil, so that the Larssen sheet pile 1 is not easy to tilt when inserted into the ground, thus ensuring the verticality when inserted into the ground.
[0035] This technical solution also improves the H-beam 2, mainly by fixing multiple support plates 6 between the two flanges of the H-beam 2. The multiple support plates 6 are all parallel to the web of the H-beam 2 and perpendicular to the flanges of the H-beam 2. By using the support plates 6 to connect the two flanges that were originally not connected into an integral structure, the shear resistance of the H-beam 2 in the lateral direction can be effectively increased. At the same time, a V-groove 9 is opened at the upper end of the H-beam 2, and a V-shaped guide part 7 is provided at the lower end of the H-beam 2. The cone angles of the V-groove 9 and the guide part 7 are the same, and the angle is within the range of greater than 40° and less than 60°. The guide part 7 is made by directly welding the material cut when opening the V-groove 9 at the upper end of the H-beam 2 to the lower end of the H-beam 2, so as to make full use of the material. One of the flanges of the H-beam 2 is attached to one side of the Larssen steel sheet pile 1 and is engaged with the snap-fit part. In order to prevent the Larssen steel sheet pile 1 from deforming when inserted, the H-beam 2 and the Larssen steel sheet pile 1 can be assembled first and then inserted into the ground together.
[0036] This technical solution also designs a pile cap 3 for connecting adjacent Larssen sheet piles 1 in vertical positions. The pile cap 3 consists of a fixing plate 8 and two back plates 12. Limiting strips 11 are fixedly connected to the middle of one side of each of the two back plates 12. The back plates 12 are fixedly connected to one side of the fixing plate 8 via the limiting strips 11. The limiting strips 11 separate the fixing plate 8 and the back plates 12 into two locking grooves 13. When connecting the two Larssen sheet piles 1, multiple countersunk holes are opened on the side wall of the back plate 12, and bolts are fitted into these holes. The bolts are connected to multiple threaded holes opened on the side wall of the fixing plate 8. When the bolts are threaded into the threaded holes, they pass through the Larssen sheet piles. The sheet pile 1 has through holes at both ends that match the driven hole and threaded hole. At this time, the end cap 3 can be used to connect the two Larssen sheet piles 1 at different positions. In addition, when the end cap 3 is installed on the upper end of the Larssen sheet pile 1 alone, the bearing capacity of the upper end of the Larssen sheet pile 1 can be improved, and the end of the pile can be prevented from deforming after being impacted when inserted into the ground. At the same time, in order to prevent the two Larssen sheet piles 1 from having a loose connection, multiple notches 5 are opened at the upper end of the pile cap 3. After the multiple notches 5 are engaged with the multiple guide plates 4 of the guide assembly, the guide plates 4 and the end cap 3 can be prevented from interfering with each other. In addition, the other part of the guide plate 4 extends out of the end cap 3 to continue to play a guiding role.
[0037] The technical summary of this utility model is as follows;
[0038] 1. Improvement of H-beam 2: By reinforcing and improving the traditional H-beam 2, multiple support plates 6 are welded between the two flanges of the H-beam 2, which can effectively increase the strength of the flanges 2. At the same time, the support plates 6 parallel to the web plate can play a guiding role when inserted into the ground, together with the guide part 7, to ensure the verticality of the H-beam 2 when inserted into the ground.
[0039] 2. Improvements to Larssen sheet piles 1: By setting interlocking portions 15 perpendicular to their base plates at both ends of the Larssen sheet pile 1, a larger space is provided between the interlocking portions 15 and adjacent piles when inserted into the ground, preventing jamming. Furthermore, the design of interlocking portions 15 of varying lengths creates a water-stop groove 14 between two interlocking portions 15. When inserted into the ground, the interlocking portions 15 will carry a significant amount of soil. When an adjacent Larssen sheet pile 1 is inserted, the interlocking portions 15 will compress the soil, filling the water-stop groove 14. Additionally, if the soil at the construction site is damp or in a muddy state, grouting can be performed within the water-stop groove 14 to achieve a seal between adjacent Larssen sheet piles 1, preventing severe leakage during later use.
[0040] 3. Install a special end cap 3. The end cap 3 can be used to connect the two Larssen steel sheet piles 1 at different positions using bolts. In addition, after installing the end cap 3, the bearing capacity of the upper end of the Larssen steel sheet pile 1 can be improved, and the end of the pile can be prevented from deforming after being impacted when it is inserted into the ground.
[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A combined structure of a Larssen steel sheet pile and an H-shaped steel for a foundation pit support, characterized by, Include: Larssen steel sheet pile (1), one side of the Larssen steel sheet pile (1) is fixedly connected with two right angle clamping strips (10), two right angle clamping strips (10) are jointly formed clamping part, both ends of Larssen steel sheet pile (1) are vertically provided with occlusion (15); H-shaped steel (2), one of the wing plates of H-shaped steel (2) is attached to one side of Larssen steel sheet pile (1) and is clamped with clamping part; Pile cap (3), the pile cap (3) is provided with two clamping grooves (13) which are the same as the upper and lower end structures of Larssen steel sheet pile (1), and two clamping grooves (13) are used to connect Larssen steel sheet pile (1) in adjacent upper and lower positions; The guide assembly is composed of a plurality of guide plates (4), and the plurality of guide plates (4) are fixed symmetrically at the lower end of the Larssen steel sheet pile (1).
2. The combined structure of the Larssen steel sheet pile and the H-shaped steel for the foundation pit support according to claim 1, characterized in that, The pile cap (3) is composed of a fixed plate (8) and two back plates (12), the middle part of one side of the two back plates (12) is fixedly connected with a limiting strip (11), the back plate (12) is fixedly connected with one side of the fixed plate (8) through the limiting strip (11), and the limiting strip (11) separates the fixed plate (8) and the back plate (12) to form two clamping grooves (13).
3. The combined structure of the Larssen steel sheet pile and the H-shaped steel for the foundation pit support according to claim 2, characterized in that, A plurality of counterbores are formed in the side wall of the back plate (12), a plurality of bolts are sleeved in the plurality of counterbores, a plurality of threaded holes are formed in the side wall of the fixed plate (8), the bolts are in threaded connection with the threaded holes, and the upper and lower ends of the Larssen steel sheet pile (1) are provided with through holes matched with the counterbores and the threaded holes.
4. The combined structure of the Larssen steel sheet pile and the H-shaped steel for the foundation pit support according to claim 1, characterized in that, A plurality of notches (5) are formed in the upper end of the pile cap (3), and the plurality of notches (5) are clamped with the plurality of guide plates (4) of the guide assembly, respectively.
5. The combined structure of the Larssen steel sheet pile and the H-shaped steel for the foundation pit support according to claim 1, characterized in that, A plurality of supporting plates (6) are fixedly connected between the two wing plates of the H-shaped steel (2), the plurality of supporting plates (6) are parallel to the web plate of the H-shaped steel (2), and the supporting plates (6) are perpendicular to the wing plates of the H-shaped steel (2).
6. The combined structure of the Larssen steel sheet pile and the H-shaped steel for the foundation pit support according to claim 1, characterized in that, A V-shaped groove (9) is formed in the upper end of the H-shaped steel (2), and a V-shaped guide part (7) is arranged at the lower end of the H-shaped steel (2).
7. The combined structure of the Larssen steel sheet pile and H-steel for the foundation pit support according to claim 1, characterized in that, The Larssen steel sheet pile (1) is composed of a bottom plate and two waist plates, and the whole is in U-shaped structure, the included angle between the waist plate and the bottom plate is 120°, the occlusion (15) is integrally bent and formed with the waist plate by bending process, and the occlusion (15) is a plane structure and the included angle between the occlusion (15) and the bottom plate is 90°.
8. The combined structure of the Larssen steel sheet pile and H-steel for the foundation pit support according to claim 1, characterized in that, The two occlusions (15) on the Larssen steel sheet pile (1) have a width difference, and an airtight groove (14) is formed by the width difference of the occlusions (15) after the occlusions (15) of two adjacent Larssen steel sheet piles (1) are occluded.