Larsen steel sheet pile supporting device

Abstract

The utility model discloses a Larsen steel sheet pile supporting device, relates to the field of foundation pit supporting, and provides the Larsen steel sheet pile supporting device which comprises a plurality of Larsen steel sheet piles and a connecting structure connected with the plurality of Larsen steel sheet piles, and the plurality of Larsen steel sheet piles are arranged around a foundation pit. The connecting structure is characterized by comprising a plurality of enclosing purlins arranged in the transverse direction of the Larsen steel sheet pile, cross braces connected with the enclosing purlins and reinforcing assemblies located on the upper portions and the lower portions of the enclosing purlins. The reinforcing assembly composed of the corbels is arranged on the Larsen steel sheet pile, the front corbel and the corbel lower support are in triangular connection, and due to the fact that the triangle has the stable characteristic, the front corbel and the corbel lower support are welded to the lower portion of the enclosing purlin, so that supporting is more stable.

Description

Technical Field

[0001] The utility model relates to the field of foundation pit support, in particular to a L-shaped steel sheet pile support device. Background Art

[0002] The L-shaped steel sheet pile, also known as the U-shaped steel sheet pile, as a new type of building material, is used as a retaining wall, a water retaining wall, and a sand retaining wall during the construction of bridge cofferdams, large pipeline laying, and temporary ditch excavation; it is used as a retaining wall, a retaining dam, and a bank revetment at docks and unloading yards, playing an important role in engineering. Using L-shaped steel sheet piles as cofferdams is not only green and environmentally friendly but also has a fast construction speed and low construction cost, with excellent waterproof functions.

[0003] A foundation pit is an excavation pit dug at the designed position of the foundation according to the base elevation and the foundation plane size. Before excavation, the excavation plan should be determined based on geological and hydrological data, combined with the situation of nearby buildings on site, and waterproof and drainage work should be done well. For shallow excavations, the method of sloping the side can be used to stabilize the soil slope, and the slope size is determined according to relevant construction engineering regulations. The foundation pit slope can be made firm through support, making it not easy for the foundation pit slope to slide. The existing L-shaped steel sheet pile support structure consists of multiple L-shaped steel sheets, which are arranged around the foundation pit. The L-shaped steel sheets are driven into the ground, and the adjacent L-shaped steel sheets are buckled with each other to limit each other. According to the size and depth of the foundation pit, when a higher strength requirement for support is needed, opposite L-shaped steel sheets can also be braced with support columns.

[0004] Among the existing L-shaped steel sheet piles, the L-shaped steel sheet with the opening facing the foundation pit is supported by the L-shaped steel sheet with the opening facing the slope, but the L-shaped steel sheet with the opening facing the slope cannot be well supported at the position without support columns, and the integrity of the L-shaped steel sheet pile is poor.

[0005] A L-shaped steel sheet pile support structure with the publication (announcement) number (CN 217758709 U) includes L-shaped steel sheets and connecting components. There are multiple L-shaped steel sheets, and the multiple L-shaped steel sheets are arranged around the foundation pit. The L-shaped steel sheet includes a main stress-bearing plate and side connecting plates. There are two side connecting plates, and the two side connecting plates are respectively arranged on both sides of the main stress-bearing plate. The two side connecting plates are perpendicular to the main stress-bearing plate and extend in the same direction. The opening directions of adjacent L-shaped steel sheets are opposite. The two side connecting plates of the L-shaped steel sheet are respectively located in the openings of adjacent two L-shaped steel sheets, and the adjacent side connecting plates of adjacent L-shaped steel sheets are in contact with each other; the connecting component includes a connecting column, and the connecting column penetrates through the two side connecting plates in contact with each other. The L-shaped steel sheet pile of this application has a better integrity effect.

[0006] However, this application does not provide a reinforcement component above and below the waling, resulting in a lack of support stability for the L-shaped steel sheet pile. Summary of the Invention

[0007] In view of the above problems, the utility model aims to provide a retaining device for L-shaped steel sheet piles, which makes the support of L-shaped steel sheet piles more stable by arranging reinforcement components above and below the purlin.

[0008] The main idea of the technical solution adopted by the utility model: The overall firmness of the traditional L-shaped steel sheet pile support is poor. In this application, a retaining system for deep foundation pits is jointly composed of steel sheet piles, corbels and purlins. First, the corbels are welded to the designated steel sheet piles, and the circumferences of the corbels in contact with the steel sheet piles are all welded by electric arc welding to ensure that all corbels are at the same horizontal elevation. Then, the purlins are placed on the corbels, and the purlins are made as horizontal as possible. If there is unevenness, steel sheets or other wedge-shaped blocks can be placed on the corbels to make the purlins as horizontal as possible. By arranging reinforcement components above and below the purlin, the support of L-shaped steel sheet piles is made more stable.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0010] A retaining device for L-shaped steel sheet piles, comprising a plurality of L-shaped steel sheet piles and a connection structure connected to the plurality of L-shaped steel sheet piles. The plurality of L-shaped steel sheet piles are arranged around the foundation pit. It is characterized in that: the connection structure includes a plurality of purlins arranged horizontally on the L-shaped steel sheet piles, cross braces connected to the purlins, and reinforcement components located above and below the purlins.

[0011] Further, the reinforcement component includes a first support beam fixedly connected above the purlin, a second support beam fixedly connected below the purlin, and a third support beam located below the second support beam. One ends of the first support beam, the second support beam and the third support beam are all connected to the L-shaped steel sheet pile.

[0012] Further, the other ends of the second support beam and the third support beam are connected in a triangular shape.

[0013] Further, the lower surface of the first support beam is fixedly connected to the upper surface of the purlin, and the upper surface of the second support beam is fixedly connected to the lower surface of the purlin.

[0014] Further, the first support beam is a reverse corbel, the second support beam is a positive corbel, and the third support beam is a corbel underprop.

[0015] The beneficial effect of the utility model is: Compared with the prior art, the improvement of the utility model lies in that a reinforcement component composed of corbels is arranged on the L-shaped steel sheet pile, and the positive corbel and the corbel underprop are connected in a triangular shape. Since the triangle has the characteristic of stability, welding the positive corbel and the corbel underprop below the purlin can make the support more stable. Description of the Drawings

[0016] Figure 1 This is the top view of the foundation pit of the L-shaped steel sheet pile support device of the present utility model.

[0017] Figure 2 This is the cross-sectional view of the foundation pit excavation of the L-shaped steel sheet pile support device of the present utility model.

[0018] Figure 3 This is the enlarged view of part A of the present utility model.

[0019] Figure 4 This is the top view of the foundation pit of the L-shaped steel sheet pile support device in Embodiment 2 of the present utility model.

[0020] Figure 5 This is the cross-sectional view of the foundation pit excavation of the L-shaped steel sheet pile support device in Embodiment 2 of the present utility model.

[0021] Figure 6 This is the enlarged view of part B of the present utility model.

[0022] Wherein: 1. L-shaped steel sheet pile, 2. Horizontal brace, 3. Inclined brace, 4. Waling, 5. Shaft ladder, 6. First support beam, 7. Second support beam, 8. Third support beam, 9. Guardrail, 10. Water retaining rib. Specific embodiments

[0023] In order to enable those of ordinary skill in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model will be further described below with reference to the drawings and embodiments.

[0024] Embodiment 1

[0025] This application discloses a L-shaped steel sheet pile support device. For the specific structure, please refer to Figures 1-6 .

[0026] This embodiment is described by taking the foundation pits of the 4# and 6# bearing platforms of the Nangong South Road Overpass ( Figures 1-3 ) as an example.

[0027] The plane size of the foundation pit supported by the steel sheet piles is 13.232×8.4 for the 4# and 6# axis foundation pits. The model of the steel sheet piles is: Japanese L-shaped IV-4 type, and the selected L-shaped IV-4 type HRSP-U-2270(400×170×15.5) steel sheet piles are 12m and 15m long, with a unit weight of 76.1 kg / m. The waling, corner braces, and horizontal supports are all made of double-welded WH500×250×10×16 steel.

[0028] First, drive in the Larssen steel sheet piles 1 around the foundation pit. The top surface of the Larssen steel sheet piles 1 is 50 cm higher than the top surface of the foundation pit. Moreover, guardrails 9 for ensuring personnel safety and water retaining ridges 10 for preventing a large amount of rainwater from entering the foundation pit are built around the foundation pit. The water retaining ridges 10 are located outside the guardrails 9. An access shaft ladder 5 for facilitating personnel to go up and down is also provided inside the foundation pit. The preparatory work before driving in the Larssen steel sheet piles 1, the driving in of the Larssen steel sheet piles 1 for supporting the foundation pit, the closure of the Larssen steel sheet piles 1, etc. specifically involved in the construction of the Larssen steel sheet piles 1 supporting the foundation pit are all prior arts and will not be elaborated here.

[0029] When the foundation pit is excavated and the support of the foundation pit by the Larssen steel sheet piles 1 is completed, carry out earth excavation to a depth of 0.5 m below the support of the collar beam 4. Install the collar beam 4 support. After the installation of the internal support is completed, continue the excavation to the bottom of the trench. During the process of taking soil, timely measure the elevation of the bottom of the pit to prevent over-excavation. Pay special attention to the protection of the pile foundation during excavation. Gradually excavate in layers and gradually lower the water level by one layer. Do not advance and over-excavate. The drainage method is preferably ditch drainage. Reserve sump wells around the foundation pit and use pumping equipment for drainage.

[0030] The Larssen steel sheet pile 1 support device of the present application includes a plurality of Larssen steel sheet piles 1 and a connection structure connected to the plurality of Larssen steel sheet piles 1. The plurality of Larssen steel sheet piles 1 are arranged around the foundation pit. Since the sizes of the foundation pits are different and the numbers of Larssen steel sheet piles used are different, they can be selected according to actual needs and no additional restrictions are imposed here. The connection structure includes multiple collar beams 4 welded transversely to the Larssen steel sheet piles 1, cross braces 2 connected to the collar beams 4, and reinforcement components located above and below the collar beams 4. Since the depths of the foundation pits of the main lines 4# axis and 6# axis are 5.7 m and they are highly liquefied areas, a collar beam 4 and a cross brace 2 need to be provided on the Larssen steel sheet piles 1, and the height from the ground is 2.8 m. In order to make the collar beam 4 more stable, the present application also welds a diagonal brace 3 between every two collar beams 4. As Figure 1 shown, the collar beams 4, diagonal braces 3, and cross braces 2 are all made of double-spliced welded WH500×250×10×16 steel sections.

[0031] In order to make the retaining system of the deep foundation pit more firm, the present application also provides reinforcement components above and below the collar beam.

[0032] The reinforcement components include a first support beam 6 fixedly connected above the collar beam 4, a second support beam 7 fixedly connected below the collar beam 4, and a third support beam 8 located below the second support beam 7. One ends of the first support beam 6, the second support beam 7, and the third support beam 8 are all welded to the Larssen steel sheet piles 1. Moreover, the lower surface of the first support beam 6 is welded to the upper surface of the collar beam 4, and the upper surface of the second support beam 7 is welded to the lower surface of the collar beam 4.

[0033] Among them, the first support beam 6 is a reverse corbel, the second support beam 7 is a positive corbel, and the third support beam 8 is a strut under the corbel. The positive corbel and the strut under the corbel are connected in a triangular shape. Due to the stable characteristics of the triangle, welding the positive corbel and the strut under the corbel below the waling 4 can make the support more stable, and the upper surface of the positive corbel is welded and connected to the lower part of the waling 4.

[0034] More specifically, first weld the positive corbels on the specified sheet pile 1. The entire circumference where the positive corbels contact the sheet pile 1 is welded by electric arc welding to ensure that all positive corbels are at the same horizontal elevation. Then place the waling 4 on top of the corbels and try to keep the waling 4 horizontal. If it is uneven, steel sheets or other wedge-shaped blocks can be placed on the positive corbels to try to keep the waling 4 level.

[0035] After the waling 4 is installed, use a crane to cooperate in welding the cross braces 2. When the cross braces 2 are horizontal at the specified connection position, roughly fix the cross braces 2 and the waling 4 by electric welding, and then carefully weld the circumferences where the waling 4 and the cross braces 2 contact. After welding, to reinforce the connection strength, weld triangular steel sheets with dimensions of 150×150×10mm at the double armpits of the right-angle connection between the waling 4 and the cross braces 2, and weld two sheets at each armpit.

[0036] Embodiment 2

[0037] The construction process and the materials used in this embodiment are the same as those in Embodiment 1. The difference is that this embodiment takes the foundation pits of the 5# axis of the main bridge and the 1# foundation pit of the north auxiliary bridge with a depth of 8.8m and a highly liquefied area ( Figures 4-6 ) for illustration. In this area, there are two rows of waling 4 and two rows of cross braces 2 set on the sheet pile 1. The first row of waling 4 and the first row of cross braces 2 are set 2.5m below the ground surface, and the second row of waling 4 and the second row of cross braces 2 are set 3.0m below the first row of cross braces 2. The waling 4 and the cross braces 2 are both made of double-welded WH500×250×10×16 section steel.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A Larsen steel sheet pile support device, comprising a plurality of Larsen steel sheet piles (1) and a connection structure connected to the plurality of Larsen steel sheet piles (1), wherein the plurality of Larsen steel sheet piles (1) are arranged around a foundation pit, and characterized in that: The connection structure comprises a plurality of perimeter purlins (4) arranged in the transverse direction of the Larsen steel sheet piles (1), a transverse brace (2) connected to the perimeter purlins (4), and reinforcement components located above and below the perimeter purlins (4).

2. A Larsen steel sheet pile support device according to claim 1, characterized in that: The reinforcement assembly comprises a No. 1 support beam (6) fixedly connected above the perimeter purlin (4), a No. 2 support beam (7) fixedly connected below the perimeter purlin (4), and a No. 3 support beam (8) located below the No. 2 support beam (7), and one end of the No. 1 support beam (6), the No. 2 support beam (7) and the No. 3 support beam (8) are all connected to the Larsen steel sheet pile (1).

3. A Larsen steel sheet pile support device according to claim 2, characterized in that: The other ends of the second support beam (7) and the third support beam (8) are connected in a triangle.

4. A Larsen steel sheet pile support device according to claim 3, characterized in that: The lower surface of the No. 1 support beam (6) is fixedly connected to the upper surface of the surrounding purlin (4), and the upper surface of the No. 2 support beam (7) is fixedly connected to the lower surface of the surrounding purlin (4).

5. A Larsen steel sheet pile support device according to claim 4, characterized in that: The No. 1 support beam (6) is a reverse corbel, the No. 2 support beam (7) is a positive corbel, and the No. 3 support beam (8) is a corbel lower support.

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