A connection stable hat-shaped steel sheet pile and a method for installing the same

Abstract

The application discloses a cap-shaped steel sheet pile with stable connection and a mounting method, which comprises a cap-shaped steel sheet pile body, the cap-shaped steel sheet pile body is a cap-shaped steel sheet pile structure, both sides of the cap-shaped steel sheet pile body are fixedly connected with connecting plates, one side of each connecting plate is fixedly connected with a clamping plate, the clamping plate of the cap-shaped steel sheet pile body is connected with the clamping plate of an adjacent cap-shaped steel sheet pile body in a clamping and matching mode, connecting pieces for reinforcing the connection of the two clamping plates are arranged at the connecting position of the two clamping plates, and an inserting plate is fixedly connected to the lower side of the cap-shaped steel sheet pile body. The cap-shaped steel sheet pile has the advantages that every two adjacent cap-shaped steel sheet piles are connected through the clamping plates, the connecting position is further reinforced by using the connecting pieces, the compression resistance of the two connected cap-shaped steel sheet piles to the forward direction and the lateral direction is simultaneously improved, and therefore the overall stability of a foundation pit enclosing structure formed by the cap-shaped steel sheet piles is improved.

Description

Technical Field

[0001] This invention relates to the field of cap-shaped steel sheet pile technology, and in particular to a cap-shaped steel sheet pile with a stable connection and an installation method thereon. Background Technology

[0002] In the foundation pit construction phase of building construction, it is necessary to install a retaining structure to improve the stability of the excavated foundation pit and ensure the safety of the construction. Since cap-shaped sheet piles serve both as water-stopping and soil-retaining elements, multiple cap-shaped sheet piles can be interlocked to form a continuous retaining structure, which is easy to assemble and disassemble and can be reused. Therefore, cap-shaped sheet piles are commonly used to protect the foundation pit when installing retaining structures. However, two adjacent cap-shaped sheet piles are usually interlocked and directly connected by splicing, with a support column erected at the connection point for reinforcement. This reinforcement method is prone to loosening under prolonged positive pressure, requiring regular inspections by construction personnel. Any loosening must be reinforced immediately, which is cumbersome, time-consuming, and labor-intensive. Furthermore, this reinforcement method has very little resistance to lateral pressure; under significant lateral pressure, the entire retaining structure may deform, posing a significant safety hazard to the foundation pit construction. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a securely connected cap-shaped steel sheet pile and its installation method, thereby solving the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A stable cap-shaped sheet pile includes a cap-shaped sheet pile body, wherein the cap-shaped sheet pile body is a cap-shaped sheet pile structure, and connecting plates are fixedly connected to both sides of the cap-shaped sheet pile body. Each connecting plate has a fixedly connected clamping plate on one side. The clamping plate of the cap-shaped sheet pile body is engaged with the clamping plate of the adjacent cap-shaped sheet pile body. A connector for reinforcing the connection between the clamping plates of two cap-shaped sheet pile bodies is provided at the connection point. An insert plate is fixedly connected to the lower side of the cap-shaped sheet pile body.

[0006] Preferably, the connector includes two L-shaped plates that can be spliced ​​together to form a rectangular frame. The two L-shaped plates can be tightly attached to the side wall where the two cap-shaped steel sheet pile bodies are connected. It also includes a locking barrel with an insertion port at the bottom, which is inserted into and connected to the rectangular frame formed by splicing the two L-shaped plates.

[0007] Preferably, each L-shaped plate is fixedly connected to two vertically arranged inflatable side strips, each inflatable side strip is set on the side wall at the junction of the L-shaped plate and the cap-shaped steel sheet pile body, each L-shaped plate side wall is provided with two inflatable chambers, each inflatable chamber is correspondingly set with an inflatable side strip, each inflatable chamber is slidably connected to a piston plate, each inflatable chamber bottom side is fixedly connected to the piston plate, each piston plate side side is fixedly connected to a push rod, each push rod extends out of the inflatable chamber, and each inflatable chamber is connected to the corresponding inflatable side strip through a vent pipe.

[0008] Preferably, the lower end of the insert plate is tapered.

[0009] Preferably, both sides of the insert plate are fixedly connected to support plates that are inclined upwards.

[0010] Preferably, both support plates are provided with multiple square holes.

[0011] A method for installing a securely connected cap-shaped steel sheet pile, wherein the cap-shaped steel sheet pile body is used in combination with H-beams for foundation pit support, comprising the following steps:

[0012] Step 1: Measure and mark the excavation positions on the soil-facing side and the foundation pit side of the H-beam respectively. Extend the edge of the combined structure of the cap-shaped steel sheet pile body and the H-beam by .m. Install the guide plate, which is composed of a single layer of double-row steel sections.

[0013] Step 2: Level the site. Use a vibratory hammer and crawler crane to drive the cap-shaped steel sheet pile body and H-beam steel composite structure. First, drive two sets of cap-shaped steel sheet pile bodies and H-beam steel composite structures at both ends of the guide plate as positioning piles, and weld them to the guide plate as a whole. Use a total station to control the verticality when driving the positioning piles, and adjust them in time if there is any deviation.

[0014] Step 3: Ensure that the guide plate is positioned ~cm lower than the top of the cap-shaped sheet pile body and the H-beam composite structure. Then, set an H-beam as a guide pile for every other cap-shaped sheet pile body. After the guide piles are driven in, weld the guide plate onto the guide piles. Then drive in the cap-shaped sheet pile body. When driving the cap-shaped sheet pile body into adjacent cap-shaped sheet pile bodies, connect them by interlocking the connecting plate and the clamping plate.

[0015] Step 4: When driving the cap-shaped steel sheet pile body and the H-beam composite structure, apply a mixture of grease and grease to the side walls of the pile.

[0016] During the driving process, the pile head height difference is adjusted to ≤cm. After the cap-shaped steel sheet pile body and H-beam are driven to the corresponding elevation, the connected cap-shaped steel sheet pile bodies and adjacent cap-shaped steel sheet pile bodies are firmly fixed with connectors.

[0017] Step 5: After the cap-shaped steel sheet pile body and the H-beam composite structure are completed, clean, level, and compact the ground within a certain range of .m.

[0018] A plastic isolation membrane is wrapped around the exposed part of the cap-shaped steel sheet pile body and the H-shaped steel composite structure, then the steel bars are tied, wooden boards are installed, and C-type concrete is poured, so as to provide effective support during the excavation of the foundation pit side.

[0019] Preferably, in step four, the inclination of each pile is measured and monitored at any time during the driving process to ensure that it does not exceed a certain percentage. When the deviation is too large and cannot be corrected by the alignment method, the pile is pulled out and driven again.

[0020] The advantages of this invention are: every two adjacent cap-shaped sheet piles are connected by a clamping plate and the connection is further reinforced by a connector, which can simultaneously improve the compressive strength of the two connected cap-shaped sheet piles in both the positive and lateral directions, thereby improving the overall stability of the foundation pit retaining structure formed by the cap-shaped sheet piles. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the basic structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the connection structure between the cap-shaped steel sheet pile body and the adjacent cap-shaped steel sheet pile bodies;

[0023] Figure 3 This is a basic structural diagram of the connector;

[0024] Figure 4 yes Figure 2 Sectional view of AA;

[0025] Figure 5 This is a schematic diagram of the basic structure of two L-shaped plates;

[0026] Figure 6 yes Figure 5 Enlarged view of part E in the middle;

[0027] Figure 7 This is a schematic diagram of the connection structure between the inflatable edge strip and the L-shaped plate;

[0028] Figure 8 This is a schematic diagram of the basic structure of the insert plate;

[0029] Figure 9 This is a schematic diagram of the connection structure between the positioning pile and the guide plate;

[0030] Figure 10 This is a diagram showing the state of foundation pit support using a combination of H-beams and cap-shaped sheet piles. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] Example 1

[0033] like Figure 1-8 As shown, the present invention provides a stable cap-shaped sheet pile, comprising a cap-shaped sheet pile body 1, which is a cap-shaped sheet pile structure. Connecting plates 2 are welded to both side walls of the cap-shaped sheet pile body 1, and a fixing plate 21 is welded to one side of each connecting plate 2. The fixing plates 21 of the cap-shaped sheet pile body 1 are engaged with the fixing plates 21 of adjacent cap-shaped sheet pile bodies 1, and multiple cap-shaped sheet pile bodies 1 are interconnected through the fixing plates 21 to form a retaining structure. The cap-shaped sheet pile bodies 1 connected by the fixing plates 21 have good resistance to frontal pressure. A fixing insert plate 4 is welded to the lower side of the cap-shaped sheet pile body 1, and the lower end of the insert plate 4 is conical. The conical lower end of the insert plate 4 allows for easier insertion into the ground, improving the stability of the cap-shaped sheet pile body 1. Both sides of the insert plate 4 are welded and fixed with inclined upward support plates 41. The two support plates 41 can be inserted into the ground together with the insert plate 4. After being inserted into the ground, the upper side of the support plates 41 is covered by compacted soil, making the cap-shaped steel sheet pile body 1 more stable after being inserted into the ground. Each of the two support plates 41 is provided with multiple square holes 411. After the support plates 41 are inserted into the ground, the soil can fill the upper and lower sides of the support plates 41 through the square holes 411, avoiding residual gaps near the support plates 41 and reducing the stability of the cap-shaped steel sheet pile body 1. At the same time, after the soil on the upper and lower sides of the support plates 41 is compacted, it can be connected together through the square holes 411, further improving the stability of the cap-shaped steel sheet pile body 1 after being inserted into the ground.

[0034] The connection point of the clamping plates 21 of the two cap-shaped sheet pile bodies 1 is provided with a connector 3 to improve the stability of the connection. The connector 3 includes two L-shaped plates 31, which can be spliced ​​into a rectangular frame. After the two L-shaped plates 31 are spliced ​​into a rectangular frame, the opposite sides of the two L-shaped plates 31 can be tightly attached to the side wall where the two cap-shaped sheet pile bodies 1 are connected. It also includes a rectangular locking barrel 32 with an insertion port at the bottom. The locking barrel 32 is inserted into the rectangular frame formed by splicing the two L-shaped plates 31. The locking barrel 32 is inserted from the top of the two L-shaped plates 31, so that the locking barrel 32 firmly fixes the rectangular frame formed by splicing the two L-shaped plates 31 to the side wall where the two cap-shaped sheet pile bodies 1 are connected. While improving the resistance of the connection point of the two cap-shaped sheet pile bodies 1 to frontal pressure, it can also improve the resistance of the enclosure structure formed by the cap-shaped sheet pile bodies 1 to lateral pressure, thereby improving the overall stability of the enclosure structure formed by the cap-shaped sheet pile bodies 1. Each L-shaped plate 31 is fixedly connected to two vertically arranged inflatable side strips 33. Each inflatable side strip 33 is set on the side wall where the L-shaped plate 31 meets the cap-shaped sheet pile body 1. When the locking barrel 32 fixes the two rectangular frames spliced ​​from the L-shaped plates 31 to the side wall where the two cap-shaped sheet pile bodies 1 meet, an inflatable side strip 33 is provided in the gap between each L-shaped plate 31 and the cap-shaped sheet pile body 1. Each L-shaped plate 31 has two inflation chambers 34 on its side wall, and the inflation chambers 34 are arranged one-to-one with the inflatable side strips 33. A piston plate 35 is slidably connected in each inflation chamber 34, and a spring 36 is fixedly connected between the bottom side of each inflation chamber 34 and the piston plate 35. A push rod 37 is fixedly connected to one side of each piston plate 35. In the free state, the spring 36 will push the push rod 37 out of the inflation chamber 34. When the L-shaped plate 31 contacts the cap-shaped sheet pile body 1, the cap-shaped sheet pile body 1 pushes the push rod 37, causing the piston plate 35 to compress the spring 36 and move towards the bottom of the inflation chamber 34. Each inflation chamber 34 is connected to the corresponding inflation strip 33 through a vent pipe 38. As the piston plate 35 moves towards the bottom of the inflation chamber 34, air in the inflation chamber 34 is introduced into the inflation strip 33 through the vent pipe 38, causing the inflation strip 33 to inflate. At the same time, the piston plate 35 moves to the upper end of the vent pipe 38 to block the opening of the vent pipe 38, preventing air in the inflation strip 33 from flowing out backward through the vent pipe 38. The gap between the L-shaped plate 31 and the cap-shaped sheet pile body 1 is filled by the inflated inflation strip 33, so that the L-shaped plate 31 not only improves the stability of the joint of the cap-shaped sheet pile body 1 but also has a good waterproof effect. Furthermore, by pulling the locking barrel 32 upwards, the two L-shaped plates 31 can be separated. At the same time, under the force of the spring 32, the piston plate 35 will push the push rod 37 back to its original position. The disassembly is flexible and the plate can be reused.

[0035] In use, two adjacent cap-shaped sheet pile bodies 1 are connected by clamping plates 21, and then the cap-shaped sheet pile bodies 1 are driven into the ground of the foundation pit through insert plates 4. After multiple cap-shaped sheet pile bodies 1 are connected to each other by clamping plates 21, a retaining structure is formed. Then, the connection between clamping plates 21 of every two adjacent cap-shaped sheet pile bodies 1 is reinforced by connectors 3. Finally, part of the soil is backfilled and compacted on the retaining structure above the ground of the foundation pit, and then an appropriate internal support structure is installed to improve the overall stability of the foundation pit retaining structure.

[0036] like Figures 9-10 As shown, and in combination Figures 1-6 A method for installing a securely connected cap-shaped steel sheet pile, wherein the cap-shaped steel sheet pile body 1 is used in combination with H-beams for foundation pit support, includes the following steps:

[0037] Step 1: Determine the excavation positions of the soil-facing side 6 and the pit side 7 of the H-beam 5 respectively. To ensure sufficient operating space for the construction of the main structure, extend the edge of the combined structure of the cap-shaped steel sheet pile body 1 and the H-beam 5 by 1.5m and install the guide plate 51. The guide plate 51 is composed of a single layer of double-row steel sections.

[0038] Step 2: Level the site. Use a vibratory hammer and crawler crane to drive the cap-shaped steel sheet pile body 1 and H-beam 5 combined structure. First, drive two sets of cap-shaped steel sheet pile body 1 and H-beam 5 combined structure as positioning piles 52 at both ends of the guide plate 51, and weld them to the guide plate 51 as a whole. When driving the positioning piles 52, use a total station to control the verticality and adjust in time if there is any deviation.

[0039] Step 3: Ensure that the guide plate 51 is positioned 30-50cm lower than the top of the combined structure of the cap-shaped sheet pile body 1 and the H-beam 5, so as to ensure that the pile hammer will not hit the guide plate 51. Then, set an H-beam 5 as a guide pile every other cap-shaped sheet pile body 1. After the guide piles are driven in, weld the guide plate 51 onto the guide piles, and then drive in the cap-shaped sheet pile body 1. When the cap-shaped sheet pile body 1 is driven into adjacent cap-shaped sheet pile bodies 1, it is connected by the connecting plate 2 and the clamping plate 21.

[0040] Step 4: When driving the cap-shaped steel sheet pile body 1 and H-beam 5 into the combined structure, apply a mixture of grease and grease to the side walls of the piles to reduce frictional resistance during driving and enhance seepage prevention performance; during the driving process, measure and monitor the inclination of each pile at any time to ensure it does not exceed 1%. If the inclination is too large and cannot be corrected by aligning, pull it out and drive it again.

[0041] During the driving process, the elevation of the pile head may be uneven. The pile head elevation difference needs to be adjusted to ≤10cm. After the cap-shaped steel sheet pile body 1 and H-beam 5 are driven to the corresponding elevation, the connected cap-shaped steel sheet pile body 1 and the adjacent cap-shaped steel sheet pile body 1 are fixed firmly with the connector 3 to increase the overall stability and avoid the adjacent steel sheet piles from sinking due to excessive resistance when driving the steel sheet piles.

[0042] Step 5: After the cap-shaped steel sheet pile body 1 and H-beam 5 are combined, the ground within a 1.2m radius of its location is cleaned, leveled, and compacted.

[0043] A plastic isolation membrane is wrapped around the exposed part of the combined structure of the cap-shaped steel sheet pile body 1 and the H-shaped steel 5, then the steel bars are tied, wooden boards are installed, and C30 concrete is poured, so as to provide effective support for the excavation of the foundation pit side 7.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A securely connected cap-shaped sheet pile, comprising a cap-shaped sheet pile body (1), wherein the cap-shaped sheet pile body (1) is a cap-shaped sheet pile structure, characterized in that: The cap-shaped sheet pile body (1) is fixedly connected to both sides of the connecting plate (2), and a clamping plate (21) is fixedly connected to one side of each connecting plate (2). The clamping plate (21) of the cap-shaped sheet pile body (1) is engaged with the clamping plate (21) of the adjacent cap-shaped sheet pile body (1). A connector (3) for reinforcing the connection between the clamping plates (21) of the two cap-shaped sheet pile bodies (1) is provided at the connection point. An insert plate (4) is fixedly connected to the lower side of the cap-shaped sheet pile body (1). The lower end of the insert plate (4) is conical. An inclined upward support plate (41) is fixedly connected to both sides of the insert plate (4). Multiple square holes (411) are provided on both support plates (411). The connector (3) includes two L-shaped plates (31), which can be spliced ​​into a rectangular frame. The two L-shaped plates (31) can be tightly attached to the side wall of the two cap-shaped steel sheet pile bodies (1) respectively. It also includes a locking barrel (32) with an insertion port at the bottom. The locking barrel (32) is inserted into the rectangular frame formed by splicing the two L-shaped plates (31). Each L-shaped plate (31) is fixedly connected to two vertically arranged inflatable side strips (33). Each inflatable side strip (33) is set on the side wall where the L-shaped plate (31) meets the cap-shaped steel sheet pile body (1). Each L-shaped plate (31) side wall is provided with two inflatable chambers (34). The inflatable chambers (34) and the inflatable side strips (33) are arranged one-to-one. Each inflatable chamber (34) is slidably connected to a piston plate (35). A spring (36) is fixedly connected between the bottom side of each inflatable chamber (34) and the piston plate (35). A push rod (37) is fixedly connected to one side of each piston plate (35). Each push rod (37) extends out of the inflatable chamber (34). Each inflatable chamber (34) and the corresponding inflatable side strip (33) are connected through a vent pipe (38).

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