Steel sheet pile with detachable connecting mechanism

Abstract

The utility model belongs to the technical field of urban road engineering, and particularly relates to a steel sheet pile with a detachable connecting mechanism. Comprising a steel plate pile body, connecting lock catches and connecting bolts. A plurality of rows of bolt holes are formed in the two ends of the steel plate pile body; the connecting lock catch is a short-strip-shaped steel plate, the section shape of the connecting lock catch is matched with that of the steel plate pile body, and the connecting lock catch can be tightly nested on the steel plate pile body; a plurality of rows of bolt holes are also formed in the positions, corresponding to the bolt holes of the steel plate pile body, of the connecting lock catch; the steel plate pile body and the connecting lock catch penetrate through the corresponding bolt holes through connecting bolts to be detachably connected. The utility model has the advantages that the problem of insufficient construction space is solved, and the construction period is shortened; the detachable connecting mechanism and the steel sheet pile can be recycled.

Description

Technical Field

[0001] This utility model belongs to the field of urban road engineering technology, and specifically relates to a steel sheet pile with a detachable connection mechanism. Background Technology

[0002] In urban construction, foundation pit excavation is required. Due to the complex surrounding environment of the proposed trench (for example, there is an elevated section above the proposed pipeline trench, and there are important buildings next to the foundation pit), it is generally required that the exposure time of the foundation pit be as short as possible and the foundation safety be ensured. The current construction method is mainly open excavation. Due to the limitation of clearance, the current technology can only use high-pressure jet grouting piles as gravity retaining walls. The current method has the following defects: (1) The comprehensive unit price of gravity retaining walls is relatively high; (2) The construction period is long and there are many construction procedures; (3) Since the lateral displacement control capability of gravity retaining walls largely depends on the mixing uniformity and strength index of the pile body, the displacement control capability is weaker compared with other foundation pit retaining walls. (4) Gravity retaining walls are generally large in size. During the construction of mixing piles, the surrounding soil will bulge or shift due to the squeezing effect of grouting pressure. This situation is very unfavorable to traffic at road intersections. (5) Gravity retaining walls occupy a large area, making traffic organization difficult. In view of the above difficulties and various defects of gravity retaining walls, a steel sheet pile process that can be used in low-clearance environments is urgently needed to replace gravity retaining walls in the construction process.

[0003] Channel steel support is one of the commonly used foundation pit support solutions. The sheet piles used in channel steel support are generally pre-formed in a factory in one piece, making splicing impossible. Therefore, with current technology, ordinary sheet pile technology cannot meet low clearance requirements in certain specific scenarios, such as construction under viaducts. Currently, very few projects under construction encountering such complex and restrictive environments have adopted segmented sheet piles. If the required length is far off, welding is used between the sheet piles. The welding height on-site depends heavily on the skills of the on-site construction personnel, resulting in significant quality variations. If welded sheet piles are used, they cannot be removed after construction, increasing investment, causing abandoned projects, and creating unintended underground obstacles. Furthermore, if the spliced ​​sheet piles are too long, some length needs to be cut off, easily leading to waste.

[0004] Therefore, the sheet pile with a detachable connection mechanism of this patent greatly solves the above problems and is an environmentally friendly technology. Summary of the Invention

[0005] The purpose of this utility model is to provide a steel sheet pile for retaining walls that has a short construction time, low cost, and wide adaptability, as well as a corresponding matching steel sheet pile with a detachable connection mechanism.

[0006] The steel sheet pile with a detachable connection mechanism provided by this utility model includes a steel sheet pile body, a connecting lock, and connecting bolts;

[0007] The sheet pile body is a long strip of steel plate with several rows of bolt holes at both ends;

[0008] The connecting latch is a short strip of steel plate with a cross-sectional shape that matches the sheet pile body and can be tightly nested on the sheet pile body; the connecting latch also has several rows of bolt holes corresponding to the bolt hole positions of the sheet pile body;

[0009] The sheet pile body and the connecting lock are detachably connected by connecting bolts passing through corresponding bolt holes;

[0010] Several sheet piles can be connected together in sequence along their length by several connecting locks. By adjusting the arrangement of the bolt holes on the sheet piles and the bolt holes on the connecting locks, the total length of two adjacent sheet piles can be adjusted.

[0011] In this utility model, the bolt holes on the steel sheet pile body are arranged in two rows, with two in each row; the bolt holes on the connecting lock are arranged in four rows, with two in each row; the spacing between adjacent upper and lower rows of bolt holes is the same.

[0012] In this invention, the cross-sectional shape of the sheet pile body is a U-shape formed by stamping a single-sided steel plate; two adjacent sheet pile bodies can be connected together by having their U-shaped openings facing each other and their sides fitting together from the inside.

[0013] In this invention, the sheet pile body and connecting lock are modular, standard-specification customized components, enabling large-scale mass production.

[0014] In use, this invention involves first joining several sheet piles in the first row side-by-side and embedding them in the soil. The upper ends of the sheet piles are connected to the lower ends of the connecting locks via bolt holes. Then, the lower ends of several sheet piles in the second row are fixedly connected to the upper ends of the connecting locks via bolt holes, and so on, connecting several rows of sheet piles in this manner. The sheet piles and connecting locks adopt a modular size standard. This allows for adjustment of the connection length between the sheet piles by adjusting the position of the bolt holes between the sheet piles and the connecting locks, thus adapting to construction scenarios with different depth requirements. For example, for sections with small length differences, splicing and cutting are unnecessary; only the spacing between the two joined sheet piles needs to be adjusted, with the length difference compensated by the length of the connecting locks. The sheet pile fastening connectors can be bolted on-site after the next sheet pile section enters the soil, eliminating the need for on-site drilling. The positioning bolt holes are prefabricated in the factory, facilitating rapid on-site construction in one step. Furthermore, it eliminates the need for welding or other open flame operations, avoiding the emission of toxic and harmful gases and reducing the risk of fire. After use, pull out the sheet piles, unscrew the bolts, and disassemble each sheet pile body. Undamaged sheet pile bodies can be used for the next construction.

[0015] This utility model features a modular design, simple structure, and convenient operation. It is suitable for scenarios requiring steel sheet piles of different lengths, reducing material waste. Furthermore, the bolt connection method allows for non-destructive disassembly of the steel sheet piles, enabling them to be recycled and significantly reducing construction costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly structure of this utility model.

[0017] Figure 2 This is a cross-sectional view of the sheet pile body and the connecting lock.

[0018] In the diagram, the numbers are: 1 for the sheet pile body, 2 for the connecting lock, and 3 for the bolt hole. Detailed Implementation

[0019] This utility model is applicable to the excavation and retaining construction of the pipeline trench protection project directly below the projection surface of an elevated bridge.

[0020] The pipeline trench excavation for this project is located at an intersection and needs to be carried out quickly at night to minimize the impact on road traffic. At the same time, since it is located directly under the light rail viaduct, the excavation depth of the pit is 3.5m. It is planned to use traditional 7m long steel sheet piles for retaining. However, in many cases, the clearance height under the viaduct is limited (for example, the clearance may only be about 5m), and the traditional whole 7m long steel sheet piles cannot be driven. If they are cut to a shorter size, the pile driving depth cannot be met.

[0021] To minimize the impact of tunnel excavation and unloading on the elevated section of the light rail, the typical exposure time of the foundation pit excavation should be controlled within 8 hours. However, the construction method of conventional gravity retaining walls requires about 7 days, which cannot meet the requirements. At the same time, since the manhole pipes are located at the intersection, the traditional gravity retaining wall system occupies a large area, and the long-term exposure of the foundation pit cannot meet the requirements of the traffic police department for road traffic organization. To achieve this requirement, a steel sheet pile construction process with a detachable connection mechanism was adopted.

[0022] This utility model includes a steel sheet pile body 1, a connecting lock 2, and connecting bolts; all of which are prefabricated in the factory.

[0023] The sheet pile body 1 is a long strip of steel plate with bolt holes 3 at both ends, arranged in two rows of two bolt holes each. The cross-sectional shape of the sheet pile body 1 is either a U-shape formed by stamping a single-sided steel plate or a U-shape formed by welding three steel plates (two shorter and one longer). The length of the sheet pile body 1 can be preset to 3m and the width to 360mm. Two adjacent sheet pile bodies 1 can be connected together by U-shaped openings facing each other and sides fitting together from the inside. Figure 1 As shown.

[0024] The connecting latch 2 is a short strip steel plate with a cross-sectional shape that matches the sheet pile body 1. The manufacturing process is the same as that of the sheet pile body 1, and it can be tightly nested on the sheet pile body 1. The length is 2m. The connecting latch 2 is also provided with bolt holes 3 corresponding to the bolt holes 3 of the sheet pile body 1. There are four rows of bolt holes 3, two in each row. The horizontal hole spacing of the bolt holes 3 is 120mm, and the vertical hole spacing is 500mm.

[0025] The sheet pile body 1 and the connecting lock 2 are detachably connected by connecting bolts passing through corresponding bolt holes 3.

[0026] Several sheet pile bodies 1 can be connected together in sequence along their length by several connecting locks 2. By adjusting the arrangement of the bolt holes 3 on the sheet pile bodies 1 and the bolt holes 3 on the connecting locks 2, the total length of two adjacent sheet pile bodies 1 can be adjusted.

[0027] The sheet pile body is made of Q235B grade steel, and the connecting lock is made of Q390 grade steel; the gaps between the sheet piles are filled with C40 magnesium phosphate cement mortar.

[0028] The construction steps are roughly as follows:

[0029] (1) Locate the area to be constructed in the foundation pit and clarify the scope of construction;

[0030] (2) Drive the first section of the 3.5m long custom steel sheet pile body into the pile. The length of the pile driven is 2.5m, and the top 1m of steel sheet pile length is reserved for not being driven.

[0031] (3) Connect the bottom end of the connecting lock to the top of the already driven custom steel sheet pile. The connection process involves aligning the bolt holes and tightening the bolts.

[0032] (4) Hoist the second section of the steel sheet pile into place, above the connecting lock;

[0033] (5) Adjust the position of the connecting lock, connect the bottom end of the steel sheet pile to the top end of the connecting lock, and align the bolt holes and tighten the bolts during the connection process;

[0034] (6) The gap between the sheet pile and the fastener shall be filled with magnesium phosphate cement mortar;

[0035] (7) Continue construction of superimposed steel sheet pile bodies and connecting locks, and continuously drive the piles until the required sinking depth of the steel sheet piles is reached; repeat the construction by following steps 3 to 6 above; adjust the total length of all connected steel sheet pile bodies by aligning the bolt holes at different height positions of the connecting locks to achieve the most economical and suitable pile driving depth.

[0036] (8) Excavate the foundation pit to the bottom (completing the construction of steel supports during the excavation process);

[0037] (9) Construction subbase and pipe laying (or inspection well);

[0038] (10) Backfilling of the foundation pit;

[0039] (11) Remove the sheet pile body. During the removal process, apply grease and disassemble the connecting mechanism (remove the magnesium phosphate cement mortar).

[0040] (12) The sheet pile body and connecting lock are recycled for future use.

[0041] The advantages of this utility model are:

[0042] Compared with conventional gravity retaining walls, steel sheet piles and the special fasteners of this patent can be reused, making them more economical;

[0043] The construction speed is fast. Because the steel sheet piles are connected into a whole, they occupy less area compared to cast-in-place piles or piles made by construction methods with a thickness of more than 600mm, and the construction machinery is simple.

[0044] No open flame work is required on site, avoiding the entry of flammable and explosive materials such as acetylene and oxygen. For chemical, petroleum, and hazardous chemical storage and transportation plants, 100% fire-free operation can be achieved.

[0045] After the steel sheet piles of this patent are constructed, they can be completely removed by sequentially extracting them in sections, without creating underground obstacles or waste.

[0046] Although the above methods are illustrated and described as a series of structures for the sake of simplicity, it should be understood and appreciated that these methods are not specifically limited, as some structures may occur in different orders and / or concurrently with other actions from those illustrated and described herein or not illustrated and described herein but which may be understood by those skilled in the art, according to one or more embodiments.

[0047] The prior description of this disclosure is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not intended to be limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sheet pile with a detachable connection mechanism, characterized in that... This includes the sheet pile body, connecting locks, and connecting bolts; The sheet pile body is a long strip of steel plate with several rows of bolt holes at both ends; The connecting latch is a short strip of steel plate with a cross-sectional shape that matches the sheet pile body and can be tightly nested on the sheet pile body; the connecting latch also has several rows of bolt holes corresponding to the bolt hole positions of the sheet pile body; The sheet pile body and the connecting lock are detachably connected by connecting bolts passing through corresponding bolt holes; Several sheet piles can be connected together in sequence along their length by several connecting locks. By adjusting the arrangement of the bolt holes on the sheet piles and the bolt holes on the connecting locks, the total length of two adjacent sheet piles can be adjusted.

2. The sheet pile with a detachable connection mechanism as described in claim 1, characterized in that... The sheet pile body has two rows of bolt holes, two in each row; the connecting lock has four rows of bolt holes, two in each row; the spacing between adjacent upper and lower rows of bolt holes is the same.

3. The sheet pile with a detachable connection mechanism as described in claim 1 or 2, characterized in that... The cross-sectional shape of the sheet pile body is a U-shape formed by stamping a single-sided steel plate; two adjacent sheet pile bodies can be connected together by having their U-shaped openings facing each other and their sides fitting together from the inside.

4. The sheet pile with a detachable connection mechanism as described in claim 3, characterized in that... The sheet pile body and connecting lock are made of modular, standard-specification customized components.

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