A trenching pipe trench larssen pile support structure

Abstract

The utility model provides a kind of pipeline trench Larsen pile supporting structure, including steel sheet pile support, guard steel and threaded pull rod, steel sheet pile support is connected in turn and supports in the trench both sides, the inside of both sides steel sheet pile support is provided with a row of guard steel, guard steel is clamped on steel sheet pile support by supporting element, threaded pull rod is sequentially passed from guard steel and steel sheet pile support, and it extends to the outside of steel sheet pile support, steel sheet pile support outside is fixed with positioning pile in the trench side wall soil body interval, positioning pile is fixed with hoop, positioning pile's hoop is connected with fixed plate, threaded pull rod is pulled to fixed plate.The utility model adopts a kind of external anchoring type supporting structure, it passes threaded pull rod and is applied to the earth pressure on steel sheet pile, is transferred to the positioning pile and fixed plate system outside the trench, finally by external soil body, removes the obstacle in the trench center, provides open, unobstructed operating space for large machinery.

Description

Technical Field

[0001] This utility model relates to the field of trench support technology, and in particular to a Larsen pile support structure for laying pipeline trenches. Background Technology

[0002] In municipal engineering and road construction, underground pipeline laying is frequently required. This typically involves excavating trenches of considerable depth and width. To ensure construction safety and prevent soil collapse on both sides of the trench, reliable support for the trench sidewalls is essential. For deeper trenches, one support method is a combination system of steel sheet pile walers and internal bracing. This system involves driving steel sheet piles into both sides of the trench, then installing multiple horizontal steel walers (usually large I-beams or H-beams) inside, and finally installing numerous steel pipes or internal steel bracing between the opposing walers. For example, patent CN210177511U discloses a steel sheet pile support structure. However, this support system, with its crisscrossing horizontal bracing between the walers, forms a massive internal support grid. This structure significantly encroaches on valuable working space within the trench, severely restricting the rotation, movement, and operating radius of large construction machinery such as excavators and cranes. This causes considerable inconvenience for subsequent pipeline laying and drastically reduces work efficiency. In response to this situation, there is an urgent need for a new trench support structure that can maximize the release of working space within the trench while ensuring the same support strength. Summary of the Invention

[0003] This utility model aims to address the shortcomings of existing technologies by providing a Larsen pile support structure for laying pipe trenches.

[0004] To achieve the above objectives, this utility model adopts the following technical solution:

[0005] A Larssen pile support structure for laying pipeline trenches includes sheet pile support components, protective steel, and threaded tie rods. The sheet pile support components are sequentially connected and supported on both sides of the trench. A row of protective steel is provided on the inner side of each sheet pile support component. The protective steel is fixed to the sheet pile support component by fasteners. The threaded tie rod passes through the protective steel and the sheet pile support component sequentially and extends outward from the sheet pile support component. Positioning piles are fixed at intervals in the soil of the trench sidewall on the outer side of the sheet pile support component. Hoops are fixed on the positioning piles. Fixing plates are connected between the hoops of the positioning piles. The extended end of the threaded tie rod is equipped with a pad and a lock nut to be fastened to the fixing plate.

[0006] The sheet pile support component has bolt holes and screw holes cyclically opened on adjacent sheet piles.

[0007] The support component includes a support block and a locking bolt. The support block has a bolt through hole, and the locking bolt passes through the bolt through hole of the support block and the bolt hole of the sheet pile support component and is fastened to the sheet pile support component.

[0008] The guard steel is an I-beam, and the height of the support block of the support member is higher than the height of the lower flange plate of the guard steel. Fixing holes are spaced apart on the upper flange plate of the guard steel, and threaded tie rods pass through the fixing holes.

[0009] The locking bolt is threaded with two locking nuts.

[0010] The web of the protective steel is provided with reinforcing plates on both sides of the fixing holes.

[0011] The trench is provided with at least two layers of horizontal support structures consisting of protective steel and threaded tie rods on both sides, with the upper and lower layers staggered in the vertical direction.

[0012] The beneficial effects of this utility model are as follows: This utility model adopts an externally anchored support structure, which transmits the soil pressure acting on the sheet piles to the positioning piles and fixing plate system on the outside of the trench through threaded tie rods, and is ultimately borne by the external soil. This removes the obstacles in the center of the trench, providing a wide and unobstructed working space for large machinery. The protective steel is firmly fixed to the sheet piles by the brackets, forming a stable force transmission system. The threaded tie rods are then tightened to the fixing plates on the sidewall soil of the trench, ensuring the stable support of the sheet pile support for the trench. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the steel sheet pile structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the protective steel structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the structure after the protective steel and the support are connected according to this utility model;

[0017] Figure 5 This is a schematic diagram of the support structure of this utility model.

[0018] In the diagram: 1-Sheet pile support component; 11-Bolt hole; 12-Threaded rod hole; 13-Locking nut; 2-Sheet pile guard; 21-Fixing hole; 3-Threaded tie rod; 4-Reinforcing plate; 5-Support block; 6-Locking bolt; 7-Positioning pile; 8-Fixing plate; 9-Clamping hoop;

[0019] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] A Larssen pile support structure for laying pipeline trenches includes sheet pile support components 1, protective steel 2, and threaded tie rods 3. The sheet pile support components 1 are sequentially connected and supported on both sides of the trench. A row of protective steel 2 is provided on the inner side of each sheet pile support component 1. The protective steel 2 is fixed to the sheet pile support component 1 by fasteners. The threaded tie rods 3 pass through the protective steel 2 and the sheet pile support component 1 sequentially and extend to the outside of the sheet pile support component 1. Positioning piles 7 are fixed at intervals in the soil of the trench sidewall on the outside of the sheet pile support component 1. Clamps 9 are fixed on the positioning piles 7. Fixing plates 8 are connected between the clamps 9 of the positioning piles 7. The extended end of the threaded tie rod 3 is equipped with a pad and a locking nut 13 to be fastened to the fixing plate 8.

[0022] The sheet pile support component 1 has bolt holes 11 and threaded rod holes 12 cyclically opened on adjacent sheet piles, which are used to connect locking bolts 6 and threaded tie rods 3, respectively.

[0023] The support component includes a support block 5 and a locking bolt 6. The support block 5 has a bolt through hole. The locking bolt 6 passes through the bolt through hole of the support block 5 and the bolt hole 12 of the sheet pile support component 1 and is fastened to the sheet pile support component 1, that is, the support component is fixed to the sheet pile support component 1.

[0024] The guard steel 2 is an I-beam. The height of the support block 5 of the support member is higher than the height of the lower flange plate of the guard steel 2. Fixing holes 21 are spaced apart on the upper flange plate of the guard steel 2, and the threaded tie rod 3 passes through the fixing holes 21.

[0025] Two locking nuts 13 are threaded onto the locking bolt 6 to prevent the locking bolt 6 from loosening.

[0026] The web of the guard steel 2 is provided with reinforcing plates 4 on both sides corresponding to the fixing holes 21. The reinforcing plates 4 are provided at key positions of the guard steel 2, which effectively prevents the flange plate from deforming or tearing due to local stress concentration and improves the load-bearing capacity of the component.

[0027] The trench is provided with at least two layers of horizontal support structure consisting of guard steel 2 and threaded tie rod 3 on both sides, with the upper and lower layers staggered in the vertical direction.

[0028] During the construction of this utility model, the first step is: construction preparation and pile driving.

[0029] Determine the trench excavation boundary and the location for driving the external positioning piles 7;

[0030] Larsen IV type steel sheet piles are selected as the steel sheet pile support component 1. They are driven into the soil on both sides of the trench in sequence using a vibratory hammer to form a closed support wall. The steel sheet piles have pre-set cyclically arranged bolt holes 11 and screw holes 12 when they leave the factory.

[0031] Positioning piles 7 are driven into the soil at intervals of 2 meters at a distance of about 1.5 meters from the back of the sheet pile. These are steel pipe piles with a diameter of φ219mm and their length is determined by calculation to ensure sufficient anchoring force.

[0032] Step 2: Install the external anchoring system:

[0033] On the driven positioning pile 7, a clamp 9 is fixed at the designed elevation position. The clamp 9 is made of two semi-circular steel hoops fastened with high-strength bolts to ensure a tight connection with the positioning pile 7.

[0034] A fixing plate 8, made of 20mm thick steel plate, is placed horizontally between the clamps 9 of two rows of positioning piles 7 at the same elevation, and welded to the clamps 9 to form a stable external support frame.

[0035] Step 3: Excavation and installation of internal support system

[0036] After the trench is excavated in layers to the design elevation of the first support, which is set at -2.0 meters, the first layer of support is installed.

[0037] Install the support: Place the support block 5 against the inside of the sheet pile, use the locking bolt 6 to pass through the bolt holes 11 on the support block 5 and the sheet pile, and then screw on two locking nuts 13 at the end of the locking bolt 6 and tighten them to secure the support block 5.

[0038] Install guard steel 2: Use a single 20# I-beam with a length of about 12 meters as guard steel 2, and hoist it and place it on the rows of pre-installed support blocks 5. The height of the support blocks 5 is designed to effectively limit the displacement of the I-beam.

[0039] Pre-threaded tie rod 3: Pass the threaded tie rod 3 (fine rolled threaded steel, diameter φ28mm) through the inside of the trench in sequence: fixing hole 21 on the upper flange of the I-beam → screw hole 12 on the sheet pile. At this time, the end of the threaded tie rod 3 faces the outside of the trench.

[0040] Step 4: Connect the internal and external systems and tension them:

[0041] The end of the threaded tie rod 3, which has already passed through the sheet pile support 1, continues to extend outward, passing through the trench sidewall coating so that it finally passes through and is fixed to the fixing plate 8.

[0042] A washer is fitted onto the end of the threaded tie rod 3, and then the nut is tightened. A hydraulic wrench or similar tool is used to simultaneously tension and tighten the nut, causing the threaded tie rod 3 to bear preload. Thus, the earth pressure is effectively transferred to the external stable soil through the path of "protective steel 2 → support member → sheet pile → threaded tie rod 3 → fixing plate 8 → clamp 9 → positioning pile 7".

[0043] Local reinforcement: In order to disperse the concentrated stress on the flange of the I-beam by the threaded tie rod 3, a reinforcing plate 4 was welded on both sides of the web of the I-beam corresponding to the fixing hole 21 during the factory manufacturing process.

[0044] Step 5: Subsequent construction: After confirming that the first layer of support is firmly installed, continue excavating downwards to the next layer of support elevation, set at -5.0 meters or the bottom of the trench. The installation method of the second layer of support is exactly the same as that of the first layer. The upper and lower layers of support structures are staggered in the vertical direction to avoid stress concentration and facilitate installation.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A Larssen pile support structure for laying pipe trenches, characterized in that, The structure includes sheet pile support components (1), protective steel (2), and threaded tie rods (3). The sheet pile support components (1) are connected and supported on both sides of the trench in sequence. A row of protective steel (2) is set on the inner side of the sheet pile support components (1) on both sides. The protective steel (2) is fixed to the sheet pile support components (1) by means of fasteners. The threaded tie rods (3) pass through the protective steel (2) and the sheet pile support components (1) and extend to the outside of the sheet pile support components (1). Positioning piles (7) are fixed at intervals in the soil of the trench side wall on the outside of the sheet pile support components (1). Hoops (9) are fixed on the positioning piles (7). Fixing plates (8) are connected between the hoops (9) of the positioning piles (7). The extended end of the threaded tie rods (3) is equipped with a pad and a locking nut (13) to be fastened to the fixing plate (8).

2. The Larssen pile support structure for laying pipe trenches according to claim 1, characterized in that, The sheet pile support member (1) has bolt holes (11) and screw holes (12) cyclically opened on adjacent sheet piles.

3. The Larssen pile support structure for laying pipe trenches according to claim 2, characterized in that, The support includes a support block (5) and a locking bolt (6). The support block (5) has a bolt through hole. The locking bolt (6) passes through the bolt through hole of the support block (5) and the bolt hole (11) of the sheet pile support (1) and is fastened to the sheet pile support (1).

4. The Larssen pile support structure for laying pipe trenches according to claim 3, characterized in that, The guard steel (2) is an I-beam. The height of the support block (5) of the support member is higher than the height of the lower flange plate of the guard steel (2). Fixing holes (21) are spaced apart on the upper flange plate of the guard steel (2). The threaded tie rod (3) passes through the fixing holes (21).

5. A Larssen pile support structure for laying pipe trenches according to claim 3, characterized in that, Two locking nuts (13) are threaded onto the locking bolt (6).

6. A Larssen pile support structure for laying pipe trenches according to claim 4, characterized in that, The protective steel (2) has reinforcing plates (4) on both sides of the web corresponding to the fixing holes (21).

7. A Larssen pile support structure for laying pipe trenches according to claim 1, characterized in that, The trench is provided with at least two layers of horizontal support structure consisting of protective steel (2) and threaded tie rod (3) on both sides, with the upper and lower layers staggered in the vertical direction.

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