A fabricated pipeline trench foundation pit type steel support system

Abstract

The utility model provides a kind of assembly type pipeline trench foundation pit section steel supporting system, the supporting pile includes H-type steel pile, the H-type steel pile is penetrated in the non-embedded section and embedded section of supporting pile, the supporting pile further includes long steel plate in non-embedded section, long steel plate is fixedly connected on the web of H-type steel pile to form the insertion slot between long steel plate and the flange of H-type steel pile, supporting system further includes steel sheet wall, the steel sheet wall is inserted in insertion slot, H-type steel pile is away from the end of insertion slot and can be detached with section steel surrounding purlin by connecting component, the novel steel supporting system of the utility model can realize the quick installation of supporting system, also can improve the recycling rate of supporting system, so that its steel recycling rate reaches 100%, more can realize the universal support of rock quality foundation pit and soil foundation pit, increase the security of foundation pit, reduce the disturbance influence to surrounding environment.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline trench foundation pit support, and relates to a prefabricated steel support system for pipeline trench foundation pits. Background Technology

[0002] With the accelerated pace of urban renewal, pipeline construction is also speeding up. In urban centers and other areas with complex surrounding environments and no space for slope protection, the vertical support method for pipeline pits needs to be determined based on the site's geology. If the pipeline pit is made of rock (strong, moderate, or slightly weathered), a steel pipe pile support system is typically used, and the pit sidewalls need to be reinforced with wire mesh and shotcrete to stabilize the rock. If the pipeline pit is made of soil (fill, cohesive soil, silt layer, etc.), a sheet pile support system is typically used.

[0003] As can be seen from the above, the existing vertical support system for pipeline trenches needs to be selected according to the geological conditions of the project, and a uniform support system cannot be achieved. In practical use, both steel pipe pile support systems and steel sheet pile support systems have the following disadvantages: 1. In the steel pipe pile support system, the embedded section of the steel pipe pile needs to be embedded in the rock, which makes recycling difficult and wastes materials. In addition, the sidewall of the foundation pit needs to be reinforced with mesh and shotcrete on site to stabilize the soil and rock between the piles, which slows down the construction progress. 2. Although the sidewall of the foundation pit is not reinforced with mesh and shotcrete in the steel sheet pile support system, the vibration during the driving of steel sheet piles is severe, which has a significant impact on the safety of buildings (structures) around the foundation pit. 3. Furthermore, steel pipe pile and steel sheet pile support systems often use welding to fix the steel walers to the steel pipe piles (steel sheet piles), and the connection between steel walers also needs to be welded. This makes it difficult to dismantle the steel sheet piles and steel walers, and the welding process also increases the safety hazards for on-site construction workers.

[0004] Based on the above situation, there is an urgent need for a new type of prefabricated steel structure support system to solve the problems of slow installation and construction, low recycling rate, significant impact on the surrounding environment, and safety hazards of the foundation pit system. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this utility model proposes a prefabricated steel support system for pipeline trench foundation pits. This system enables rapid installation of the foundation pit system, improves the recycling rate of the support system, reduces the impact on the surrounding environment, and enhances safety. The solution is as follows: A prefabricated steel support system for pipeline trench foundation pits includes support piles, steel walers, and steel supports. The support piles include H-shaped steel piles that penetrate both the non-embedded and embedded sections of the support piles. Each support pile also includes a long steel plate located in the non-embedded section. The long steel plate is fixedly connected to the web of the H-shaped steel pile to form an insertion groove between the long steel plate and the flange of the H-shaped steel pile. The support system also includes a steel plate retaining wall that is inserted into the insertion groove. The end of the H-shaped steel pile away from the insertion groove is detachably connected to the steel waler via a connecting component.

[0006] Furthermore, the support system also includes a pile bottom rubber sleeve, which is detachably connected to the embedded section of the support pile.

[0007] Furthermore, the connecting component is a Z-shaped plate.

[0008] Furthermore, the steel walers include H-beams.

[0009] Furthermore, the pile bottom sleeve is an elastic rubber sleeve.

[0010] Furthermore, the joints of the steel walers are connected by waler corner connectors or straight connectors such as walers.

[0011] Furthermore, the long steel plate and H-beam steel pile are fixed by welding; the connecting parts, H-beam steel pile and steel waler are fixedly connected by bolts and nuts.

[0012] Compared with the prior art, the advantages of this utility model are as follows: This utility model's prefabricated steel support system for pipeline trenches and foundation pits not only enables rapid installation of the support system but also improves its recycling rate, achieving a 100% steel recycling rate. Furthermore, it enables universal support for both rock and soil foundation pits, increasing the safety of the foundation pit, reducing disturbance to the surrounding environment, avoiding on-site welding construction, and reducing steel consumption and the risk of open flame operations. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the prefabricated pipeline trench foundation pit steel support system according to an embodiment of this utility model; Figure 2 This is a schematic cross-sectional view of the combined steel pile structure according to an embodiment of the present invention; Figure 3 This is a top view schematic diagram of the prefabricated steel support system according to an embodiment of this utility model; Figure 4 This is a side view schematic diagram of the prefabricated steel support system according to an embodiment of this utility model; Figure 5 This is a partial elevation view of the embedded section of the prefabricated steel support system according to an embodiment of this utility model; Figure 6 This is a schematic diagram of the direct connection parts such as the steel waler in the foundation pit according to an embodiment of this utility model; Figure 7 This is a schematic diagram of the steel waler connection at the inner corner of the foundation pit according to an embodiment of this utility model.

[0014] In the above figures: 1. Support piles; 11. H-beam steel piles; 12. Long steel plates; 2. Steel plate retaining walls; 3. Steel walers; 4. Connecting components; 5. Pile bottom rubber sleeves; 6. Waler corner connectors; 7. Waler and other straight connectors; 8. Steel supports. Detailed Implementation

[0015] To facilitate understanding of this utility model by those skilled in the art, the specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0016] like Figures 1-7 As shown, this utility model proposes a novel prefabricated support system with steel profiles as the main material, which mainly includes support piles 1, steel plate retaining walls 2, steel walers 3, connecting components 4, pile bottom rubber sleeves 5, waler corner connectors 6, waler and other straight connectors 7, and steel supports 8.

[0017] Glossary: ​​As a pile foundation, the retaining pile 1 is mainly divided into two sections: the non-embedded section and the embedded section. The non-embedded section is the part of the retaining pile 1 located above the bottom of the excavation pit, directly exposed to the excavation face. Its core function is to retain soil and water, protecting the excavation space of the trench. The non-embedded section directly bears the active earth pressure, water pressure, and construction loads from the outside of the pit, preventing soil collapse and providing a safe working space for pipeline laying and trench construction; it also transfers the loads it bears to the lower embedded section. The embedded section, through friction with the surrounding soil and passive earth pressure, limits excessive rotation or displacement of the pile body, preventing instability and failure of the support structure; it also bears the bending moment transmitted by the pile body, avoiding excessive settlement or uplift at the pile bottom.

[0018] The retaining pile 1 is a composite steel pile, comprising an H-shaped steel pile 11 that penetrates both the non-embedded and embedded sections. The retaining pile 1 also includes a long steel plate 12 located in the non-embedded section. One end of the long steel plate is welded to the web of the H-shaped steel pile 11 to form an insertion groove between the long steel plate and the flange of the H-shaped steel pile on the side closest to the soil. The steel plate is inserted into the insertion groove. Specifically, the H-shaped steel pile 11 and the long steel plate 12 are fully welded together. The long steel plate 12 is located on the side of the H-shaped steel pile 11 closest to the soil and is welded to the bottom elevation of the excavation pit. Figure 2 As shown, a long steel plate 12 is welded to each of the corresponding positions on both sides of the web of the H-shaped steel pile 11.

[0019] In traditional support systems, the waler and piles are connected using an "upper hanging, lower support" method. This involves drilling holes in the upper part of the waler (away from the pile) and the pile body at the waler's installation elevation, then connecting the upper part of the waler to the pile body using steel wire ropes—this is the "upper hanging." Steel brackets are welded to the lower part of the waler at the pile body, with the spacing between the steel brackets being an integer multiple of the pile spacing—this is the "lower support." This traditional welding connection between the waler and piles makes steel recovery difficult, and the connection point only restricts the vertical displacement of the waler, failing to create a truly effective integrated structure. During excavation, as the supporting force increases, the waler's support cannot be effectively transferred to the piles, thus affecting the safety of the excavation pit.

[0020] This utility model abandons the traditional "upper hanging, lower supporting" welding connection method for the connection between the steel waler 3 and the support pile 1. Instead, it uses four connecting components 4 at the connection point between the support pile 1 and the steel waler 3 to fix the flange of the steel waler 3 to the support pile 1. To standardize the support material and increase the connection point area between the steel waler 3 and the support pile 1, both the steel waler 3 and the H-beam steel pile 11 are made of H-beam steel. The connecting components 4 are arranged symmetrically in two groups, upper and lower, with two in each group. They are fixed to the upper and lower flanges of the steel waler 3 and the H-beam steel pile 11 with bolts and nuts, respectively. See [reference needed]. Figure 4 The steel waler 3 is connected to the flange of the H-beam steel pile 11 near the foundation pit. The connecting component is a Z-shaped plate.

[0021] To facilitate the recycling of the retaining pile 1, the support system also includes a pile bottom rubber sleeve. Before construction, the pile bottom rubber sleeve 5 needs to be installed on the embedded section of the H-beam steel pile 11. (See attached diagram.) Figure 5 To avoid damage to the pile bottom rubber sleeve 5 during material transportation, the pile bottom rubber sleeve can be installed on-site. Specifically, the pile bottom rubber sleeve 5 can be made of ordinary soft rubber. During installation, it should be ensured that the pile bottom rubber sleeve 5 is in close contact with the H-beam steel pile 11. If installation is difficult, grease can be applied to the embedded section beforehand to facilitate the installation of the pile bottom rubber sleeve and the removal of the support pile 1.

[0022] The construction process of the support system of this utility model is as follows: Step 1: First, weld the H-shaped steel pile 11 to the long steel plate 12 to form a composite steel pile, namely the support pile 1, and fully weld the weld seam.

[0023] Step 2: Level the construction site to bring the site elevation to the design elevation. Locate the foundation pit according to the design, determine the inner edge of the pit and the center line of the piles, and use a drilling rig to drill holes in the soil according to the center line of the positioning piles, with the hole depth reaching the design pile bottom elevation.

[0024] Step 3: Place the support pile 1 in the hole. Before placing it, install the pile bottom rubber sleeve 5 of the same length to the bottom of the support pile 1 according to the embedment depth required in the design drawings. If the installation is difficult, apply an appropriate amount of grease to the bottom of the pile for lubrication.

[0025] Step 4: Place the support pile 1 inside the borehole, ensuring the steel pile is vertical. Pour cement mortar into the borehole up to the bottom elevation of the foundation pit, i.e., the upper edge of the pile bottom sleeve 5. After the mortar solidifies, continue to backfill the original soil into the borehole up to the site leveling elevation, ensuring that the borehole is filled densely.

[0026] Step 5: Repeat the drilling → pile laying → grouting (original soil) steps until each pile in the site foundation pit support is installed.

[0027] Step 6: The foundation pit is excavated in layers, with each layer excavated 0.5m. After each layer is excavated, steel plate retaining wall 2 is installed. Excavation of the foundation pit stops 0.5m below the steel support 8 elevation in the design drawings, and steel walers 3 are erected.

[0028] Step 7, as follows Figure 1 As shown, the steel waler 3 is pre-drilled at the factory according to the spacing of the steel piles, and the steel waler 3 is connected to the support pile 1 by bolts connected by connecting components 4. Figure 4 As shown, the connecting component 4 is drilled according to the bolt hole diameter. The steel waler 3 is hoisted to the steel pile inside the foundation pit using a small crane, and its position is then finely adjusted manually for connection.

[0029] Step 8: Install the first steel walers 3 one by one on the inner wall of the foundation pit until a closed loop of walers is formed. If the foundation pit is long, when the steel walers 3 are joined together, the walers are connected to each other by multiple straight connectors 7, such as walers. See [link / reference]. Figure 6 This ensures that the waler connections are of equal strength. When the steel walers 3 overlap, the walers at the corners of the foundation pit are connected to each other via waler corner connectors 6, see [link / reference]. Figure 7 .

[0030] Step 9: After the steel waler 3 is installed, install the first steel support 8.

[0031] Step 10: Continue to excavate the foundation pit in layers. Excavate to 0.5m below the elevation of the second steel support and erect the second steel waler. Repeat the installation process of steel waler 3 and steel support 8 in steps 7 to 9.

[0032] Step 11: Continue excavating the foundation pit in layers and install steel plate retaining walls 2 to the foundation elevation, construct pipeline foundations, and install pipelines after the foundations are completed.

[0033] Step 12: After the pipeline is installed, backfill the foundation pit in layers according to the design requirements to 0.5m below the second steel support 8, and then remove the steel support 8.

[0034] Step 13: After the steel support is removed, manually remove the second steel waler 3 and remove the steel waler 3 components. Continue backfilling the foundation pit to 0.5m below the first steel support 8. Remove the first steel support 8, steel waler 3 and related components, and move them out of the foundation pit. Continue backfilling the foundation pit to the design site elevation.

[0035] Step 14: After the foundation pit backfilling is completed, pull out the support pile 1 and steel plate retaining wall 2, and backfill the remaining gaps with plain soil or clay. Construction is complete.

[0036] The prefabricated steel support system for pipeline trenches and foundation pits of this utility model has a wide range of applications and can realize universal support for rock foundation pits and soil foundation pits. It solves the problem that traditional support types rely too much on engineering geology for selection. For example, Quaternary soil layers are suitable for steel sheet pile support systems, while weathered rock layers are more suitable for steel pipe pile support systems.

[0037] This utility model discloses a novel prefabricated steel support system for pipeline trenches. By using support piles that are welded together with H-shaped steel piles 11 and long steel plates 12, inserting steel plate retaining walls 2 between the piles, and installing pile bottom rubber sleeves 5 in the embedded section of the support piles, it can achieve universal support for both rock and soil foundation pits. This eliminates the construction step of hanging wire mesh and spraying concrete, saves materials and construction time, and avoids the impact of severe vibration during the installation of steel sheet piles on surrounding buildings.

[0038] Traditional steel pipe piles (sheet piles) are typically welded to steel walers due to their small contact area. This necessitates cutting and dismantling the walers during removal, which can easily damage the structure and reduce their lifespan. Cutting also leads to steel wastage. Furthermore, on-site cutting and welding with open flames increases safety hazards. In contrast, this new steel support system uses composite steel piles, which significantly increase the actual connection area between the piles and the walers compared to traditional steel pipe piles. The support piles and walers are bolted together, eliminating on-site open-flame welding and cutting, thus removing safety hazards, saving construction time, and preventing the waste of welding rods and the loss of support components caused by welding and cutting.

[0039] To ensure the overall stability of the foundation pit and prevent overturning, steel pipe pile support systems often involve injecting cement grout between the steel pipe pile and the borehole (the borehole diameter is usually slightly larger than the steel pipe pile diameter) and inside the steel pipe pile after the steel pipe pile is inserted into the borehole. This ensures the embedment effect of the steel pipe pile and the safety of the foundation pit. After the cement grout solidifies, it bonds tightly with the steel pipe pile and the surrounding soil and rock, making it impossible to pull out the steel pipe pile, resulting in steel waste. This is also the reason for the high cost of steel pipe pile support construction. This utility model uses a support pile 1 for foundation pit support piles, and a pile bottom rubber sleeve 5 is installed in the embedded section of the pile. Although cement grout is also injected into the borehole, the rubber sleeve 5 prevents the steel pile from directly contacting the cement grout. After construction is completed, the steel pile can be pulled out, realizing the reuse of the steel pile and greatly saving the support cost.

[0040] The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A prefabricated steel support system for pipeline trench foundation pits, comprising support piles, steel walers, and steel supports, characterized in that, The support pile includes an H-shaped steel pile, which penetrates both the non-embedded and embedded sections of the support pile. The support pile also includes a long steel plate located in the non-embedded section. The long steel plate is fixedly connected to the web of the H-shaped steel pile so that an insertion groove is formed between the long steel plate and the flange of the H-shaped steel pile. The support system also includes a steel plate retaining wall, which is inserted into the insertion groove. The end of the H-shaped steel pile away from the insertion groove is detachably connected to the steel waler through a connecting component.

2. The prefabricated steel support system for pipeline trench foundation pit according to claim 1, characterized in that, The support system also includes a pile bottom rubber sleeve, which is detachably connected to the embedded section of the support pile.

3. The prefabricated steel support system for pipeline trench foundation pit according to claim 1, characterized in that, The connecting component is a Z-shaped plate.

4. The prefabricated steel support system for pipeline trench foundation pit according to claim 1, characterized in that, Steel walers include H-beams.

5. A prefabricated steel support system for pipeline trench foundation pits according to claim 2, characterized in that, The bottom sleeve of the pile is an elastic rubber sleeve.

6. The prefabricated steel support system for pipeline trench foundation pit according to claim 1, characterized in that, The joints of the steel walers are connected by waler corner connectors or straight connectors such as walers.

7. The prefabricated steel support system for pipeline trench foundation pit according to claim 1, characterized in that, The long steel plate and H-beam steel pile are fixed by welding; the connecting parts, H-beam steel pile and steel waler are fixedly connected by bolts and nuts.

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