A self-resetting steel sheet pile that can complete splicing at corners independently

Abstract

The present invention discloses a self-resetting steel sheet pile that can complete splicing at corners independently, which includes a main steel sheet pile board, a concave slider, and a steel spring. A groove is provided on the front wall of the main steel sheet pile board; a tenon is provided on one side wall of the main steel sheet pile board, and a first card slot and a second card slot are respectively provided on the other side wall and one side of the rear wall. The tenon is matched and engaged with the first and second card slots; the width of the concave slider matches the width of the groove, the rear wall of the concave slider is in a "concave" structure, and its thickness gradually decreases from both sides to the middle; several steel springs are connected between the bottom of the groove of the main steel sheet pile board and the middle of the rear wall of the concave slider, and the concave slider can slide in the groove along the axial direction of the steel spring. The present invention can complete splicing in the transverse, longitudinal, and corner directions through the tenon and the first and second card slots located on one side, and the formed retaining structure has high tightness and is not prone to water seepage and other situations.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-overturning of steel sheet piles for foundation pits, and specifically to a self-resetting steel sheet pile that can complete splicing at the corner alone. Background Art

[0002] With the rapid development of China's economy, urban construction has developed rapidly. To solve problems such as housing shortages and traffic difficulties brought about by urbanization, high-rise buildings in cities have emerged in an endless stream, and a well-connected underground transportation network has also appeared in the planning blueprints of major cities. Whether it is the construction of high-rise buildings or underground transportation systems, an important issue will be involved, that is, the foundation pit. As there are more and more underground projects, the engineering geological conditions and the surrounding environment are becoming more and more complex, and problems are constantly emerging. Accidents of various sizes caused by the overturning and instability of the foundation pit retaining structure have appeared in major news media. Especially in the deep foundation pit retaining projects in soft soil areas, the scope and degree of the accidents are so large that we have to pay great attention to the stability of the foundation pit retaining structure.

[0003] At present, when selecting steel sheet piles for the retaining structure, to complete the erection of the peripheral structure of a foundation pit, usually at least two types of steel sheet piles are required to complete the splicing at the corner. And the steel sheet piles at the corner usually have a small quantity, which has a certain impact on the classification storage and transportation of steel sheet piles before and after construction. If a kind of steel sheet pile can not only complete the splicing in the horizontal and vertical directions, but also complete the splicing at the corner, it will undoubtedly provide certain convenience for both production and construction.

[0004] In view of the above deficiencies, it is necessary to design and develop a new type of steel sheet pile, which can not only reduce the influence of the change in soil pressure on the foundation pit retaining structure, but also only require one type of steel sheet pile to complete the erection of the retaining structure. Summary of the Invention

[0005] The purpose of the present invention is to provide a self-resetting steel sheet pile that can complete splicing at the corner alone. This new type of steel sheet pile uses a sliding friction plane with a large friction coefficient and multiple steel springs with a large elastic coefficient to reduce the influence of the change in soil pressure on the steel sheet piles of the retaining structure. The sudden increase in soil pressure pushes the slider to slide on the established track. During the sliding process, part of the energy generated by the soil pressure is consumed by the slider during the sliding process, and a large part of it is converted into the elastic potential energy of the steel spring, thereby reducing the possibility of the overturning and instability of the retaining structure in the foundation pit to a certain extent.

[0006] To achieve the above object, the present invention discloses a self-resetting steel sheet pile that can complete splicing at the corner alone, including a steel sheet pile main board, a concave slider, and a steel spring. The steel sheet pile main board has a square structure, and a groove is provided on its front wall. A tenon is provided on one side wall of the steel sheet pile main board, and a first card slot and a second card slot are respectively provided on the other side wall and one side of the rear wall. The tenon is matched and engaged with the first and second card slots. The width of the concave slider matches the width of the groove. The rear wall of the concave slider has a "concave" structure, and its thickness gradually decreases from both sides to the middle. The bottom of the groove of the steel sheet pile main board is connected to the middle of the rear wall of the concave slider by a plurality of the steel springs, and the concave slider can slide in the groove along the axial direction of the steel spring.

[0007] The maximum thickness of the concave slider is not greater than two-thirds of the depth of the groove.

[0008] The inner walls on both sides of the groove form sliding friction planes.

[0009] A limiting block is provided at the connection between the sliding friction plane and the bottom of the groove.

[0010] The steel spring includes a middle steel spring and two side steel springs. One end of the middle steel spring is connected to the middle of the rear wall of the concave slider, and the other end is connected to the middle of the bottom of the groove. One end of the two side steel springs is connected to both sides of the rear wall of the concave slider, and the other end is connected to both sides of the bottom of the groove. The length and outer diameter of the middle steel spring are greater than those of the two side steel springs.

[0011] A limiting rod is sleeved inside the steel spring. One end of the limiting rod is fixed to the bottom of the groove, and its length is less than the length of the steel spring.

[0012] An upper stop block and a lower stop block fixed in the groove are provided at the upper and lower parts of the groove.

[0013] The bottom of the steel sheet pile main board and the bottom of the lower stop block have a wedge-shaped structure.

[0014] The cross-section of the tenon has an isosceles trapezoid structure, and its width gradually decreases from outside to inside.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The present invention can effectively reduce the possibility of the overturning instability of the retaining structure in the foundation pit and reduce the damage to the steel sheet piles. When the soil pressure outside the retaining structure increases sharply due to reasons such as soil immersion and slope overload, the concave slider in the main board of the steel sheet pile can move within the established groove track. The friction coefficient between the concave slider and the main board of the steel sheet pile is relatively large, so that part of the energy brought by the sharply increased soil pressure can be converted into heat energy generated by friction. At the same time, the steel spring will contract during the sliding process of the concave slider, and part of the energy will also be converted into the elastic potential energy of the steel spring. Using this kind of steel sheet pile, a large part of the energy brought by the sharply increased soil pressure will be converted into heat energy and the elastic potential energy of the steel spring, thereby reducing the influence of soil pressure changes on the steel sheet piles of the retaining structure.

[0017] 2. The present invention can realize the reset function of the concave slider, and the device has a long service life and can be used many times. When the soil pressure increases sharply, the slider will displace in the established groove. At this time, the steel spring is compressed. When the soil pressure decreases, the concave slider will return to the initial position due to the reset action of the steel spring, thus realizing the reset function of the slider. The limit block is arranged between the concave slider and the main board of the steel sheet pile, and its height and width are set according to the arrangement position, density and compression limit of the steel spring. When the slider is sliding, the limit block can limit the excessive displacement of the slider, resulting in excessive compression of the steel spring, thus ensuring the normal rebound function and service life of the steel spring.

[0018] 3. This invention can achieve the splicing at the corner of the retaining structure alone and can meet various basic shapes required in foundation pit engineering. When the common retaining structure is built, usually two types of steel sheet piles need to be selected to complete the splicing at the corner. However, the steel sheet pile of the present invention can complete the splicing in the transverse, longitudinal and corner directions by the tenon and multiple card slots on one side, and the composed retaining structure has high tightness and is not easy to leak water and other situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional schematic diagram of the structural composition of the present invention;

[0020] Figure 2 is a top view sectional schematic diagram of the present invention;

[0021] Figure 3 is a schematic diagram of the bottom structure of the main board of the steel sheet pile of the present invention;

[0022] Figure 4 is a schematic diagram of the longitudinal splicing of the present invention;

[0023] Figure 5 is a schematic diagram of the splicing at the corner of the present invention.

[0024] In the figure: 1 is the main board of the steel sheet pile, 2 is the concave slider, 3 is the steel spring, 4 is the limit rod, 5 is the limit block, 6 is the sliding friction plane, 7 is the tenon, 8 is the first card slot, 9 is the second card slot, 10 is the upper stop block, 11 is the lower stop block, and 12 is the groove. Detailed implementation mode

[0025] In order to make the purpose, technical means and efficacy of the present invention more clearly understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described this time are only used to explain the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work fall within the protection scope of the present invention.

[0026] As Figures 1-5 shown, a self-resetting steel sheet pile that can complete the splicing at the corner alone in the present invention includes a main board 1 of the steel sheet pile, a concave slider 2 and a steel spring 3. The main board 1 of the steel sheet pile has a square structure, and a groove 12 is provided on its front wall; a tenon 7 is provided on one side wall of the main board 1 of the steel sheet pile, and a first card slot 8 and a second card slot 9 are respectively provided on the other side wall and one side of the rear wall. The tenon 7 is matched and engaged with the first and second card slots; the width of the concave slider 2 matches the width of the groove 12. The rear wall of the concave slider 2 has a "concave" structure, and its thickness gradually decreases from both sides to the middle; the bottom of the groove 12 of the main board 1 of the steel sheet pile is connected to the middle of the rear wall of the concave slider 2 through a plurality of the steel springs 3. The concave slider 2 can slide in the groove 12 along the axial direction of the steel spring 3. In this case, the splicing in the horizontal, vertical and corner directions can be completed through the tenon 7 and the first and second card slots on one side, and the formed retaining structure has high tightness and is not easy to leak water and other situations; through the concave slider 2 can slide in the groove 12, the friction coefficient between the concave slider 2 and the main board 1 of the steel sheet pile is relatively large, so that part of the energy brought by the suddenly increased earth pressure is converted into heat energy generated by friction; at the same time, the steel spring 3 will contract during the sliding process of the concave slider 2, and part of the energy will also be converted into the elastic potential energy of the steel spring 3; using this kind of steel sheet pile, a large part of the energy brought by the suddenly increased earth pressure will be converted into heat energy and the elastic potential energy of the steel spring, so as to reduce the influence of the change of earth pressure on the steel sheet pile of the retaining structure; when the earth pressure suddenly increases, the concave slider 2 will displace in the established groove 12 and the steel spring 3 will be compressed; when the earth pressure decreases, the concave slider 2 will return to the initial position due to the resetting action of the steel spring 3, so as to realize the reset function of the concave slider.

[0027] The maximum thickness of the concave slider 2 is not greater than two-thirds of the depth of the groove 12, so that the concave slider 2 has enough space to slide in the groove 12 of the main board 1 of the steel sheet pile, and at the same time, the steel spring 3 has enough space for arrangement and compression.

[0028] Both inner walls of the groove 12 form sliding friction planes 6 with a relatively large coefficient of friction, so that more energy can be dissipated during the sliding process of the concave slider 2. Moreover, the sliding friction plane 6 is preferably made of a hydrophobic material to prevent the steel spring 3 from rusting and failing due to long-term water seepage.

[0029] A limiting block 5 is provided at the connection between the sliding friction plane 6 and the bottom of the groove 12. The height and width of the limiting block 5 should be set according to the placement position of the steel spring 3, the density of the arrangement, and its compression limit, so as to prevent the steel spring 3 from being stressed beyond the bearing capacity limit during the sliding process of the concave slider 2, which may reduce its service life or even cause the device to fail due to inability to rebound normally.

[0030] The steel spring 3 includes a middle steel spring and two side steel springs. One end of the middle steel spring is connected to the middle of the rear wall of the concave slider 2, and the other end is connected to the middle of the bottom of the groove 12. One end of the two side steel springs is connected to both sides of the rear wall of the concave slider 2, and the other end is connected to both sides of the bottom of the groove 12. The length and outer diameter of the middle steel spring are greater than those of the two side steel springs. The middle steel spring is set to be longer, thicker, and denser than the two side steel springs, which can improve the energy conversion efficiency. And to ensure the long-term normal use of the device, the steel spring 3 is made of a compression spring with good corrosion resistance.

[0031] A limiting rod 4 is sleeved inside the steel spring 3. One end of the limiting rod 4 is fixed to the bottom of the groove 12, and its length is less than that of the steel spring 3.

[0032] An upper stop block 10 and a lower stop block 11 fixed inside the groove 12 are provided at the upper and lower parts of the groove 12. The length of the groove 12 is restricted by the upper and lower stop blocks to ensure that the concave slider 2 can only slide along the axial direction of the steel spring 3 and cannot move in the vertical direction.

[0033] The bottom of the steel sheet pile main board 1 and the bottom of the lower stop block 11 are in a wedge-shaped structure to improve the penetrability during the construction of the steel sheet pile and the operability of the splicing between the steel sheet piles.

[0034] The cross-section of the tenon 7 is an isosceles trapezoid structure, and its width gradually decreases from the outside to the inside to ensure that the tenon 7 will not come off after being clamped with the first and second grooves.

[0035] Working principle: The overturning instability of the retaining structure mainly occurs in the gravity structure or the cantilever retaining structure. Under the action of the active earth pressure outside the pit, the retaining structure rotates around a certain point at its lower part, and the top of the retaining structure topples into the pit. When the earth pressure outside the steel sheet pile of the retaining structure is within the safe range, the displacement range of the concave slider in the track is small, but the small displacement can also share part of the energy generated by the earth pressure for the steel sheet pile, which is helpful for extending the service life of the steel sheet pile. This invention can effectively reduce the possibility of the overturning instability of the retaining structure in the foundation pit and reduce the damage to the steel sheet pile. When the earth pressure outside the retaining structure surges due to reasons such as soil immersion and surcharge on the top slope, the slider in the steel sheet pile can move in the established groove track. The friction coefficient between the contact surface of the slider and the main board of the steel sheet pile is large, and part of the energy brought by the surging earth pressure can be converted into heat energy generated by friction. At the same time, the steel spring will contract during the sliding process of the concave slider, and part of the energy will be converted into the elastic potential energy of the steel spring. When using this kind of steel sheet pile, a large part of the energy brought by the surging earth pressure will be converted into heat energy and the elastic potential energy of the steel spring, thereby reducing the influence of the earth pressure change on the steel sheet pile of the retaining structure.

[0036] The above are only the preferred embodiments of the present invention. Based on these embodiments, it should be noted that various changes, modifications, substitutions, and improvements can be made to the embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self - resetting steel sheet pile that can complete splicing at the corner independently, Characterized in that: It includes a steel sheet pile main board (1), a concave slider (2) and a steel spring (3). The steel sheet pile main board (1) is of a square structure, and a groove (12) is provided on its front wall; a tenon (7) is provided on one side wall of the steel sheet pile main board (1), and a first card slot (8) and a second card slot (9) are respectively provided on the other side wall and one side of the rear wall. The tenon (7) is matched and engaged with the first and second card slots; The width of the concave slider (2) matches the width of the groove (12). The rear wall of the concave slider (2) is of a "concave" structure, and its thickness gradually decreases from both sides to the middle; the bottom of the groove (12) of the steel sheet pile main board (1) is connected to the middle of the rear wall of the concave slider (2) through a plurality of the steel springs (3). The concave slider (2) can slide in the groove (12) along the axial direction of the steel spring (3); sliding friction planes (6) are formed on both inner walls of the groove (12); a limiting block (5) is provided at the connection of the sliding friction plane (6) and the bottom of the groove (12); the steel spring (3) includes a middle steel spring and two side steel springs. One end of the middle steel spring is connected to the middle of the rear wall of the concave slider (2), and the other end is connected to the middle of the bottom of the groove (12); one end of the two side steel springs is connected to both sides of the rear wall of the concave slider (2), and the other end is connected to both sides of the bottom of the groove (12); the length and outer diameter of the middle steel spring are larger than those of the two side steel springs; the cross - section of the tenon (7) is of an isosceles trapezoid structure, and its width gradually decreases from outside to inside.

2. A self - resetting steel sheet pile that can complete splicing at the corner independently according to claim 1, Characterized in that: The maximum thickness of the concave slider (2) is not greater than two - thirds of the depth of the groove (12).

3. A self - resetting steel sheet pile that can complete splicing at the corner independently according to claim 2, Characterized in that: A limiting rod (4) is sleeved inside the steel spring (3). One end of the limiting rod (4) is fixed to the bottom of the groove (12), and its length is less than the length of the steel spring (3).

4. A self - resetting steel sheet pile that can complete splicing at the corner independently according to claim 3, Characterized in that: An upper stop block (10) and a lower stop block (11) fixed in the groove (12) are provided at the upper and lower parts of the groove (12).

5. A self - resetting steel sheet pile that can complete splicing at the corner independently according to claim 4, Characterized in that: The bottom of the steel sheet pile main board (1) and the bottom of the lower stop block (11) are of a wedge - shaped structure.

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