A steel sheet pile support structure for a pipeline foundation pit and its construction method

Abstract

This application relates to a steel sheet pile support structure for a pipeline foundation pit and its construction method. The main technical solution is a steel sheet pile support structure for a pipeline foundation pit, which includes multiple steel sheet members and channel steels. The steel sheet member includes a main board, and wing plates are formed by bending in the same direction on both sides in the width direction of the main board. The steel sheet member is in a "︹" shape, and the openings of adjacent steel sheet members are arranged in opposite directions. The opening of the channel steel is arranged opposite to the opening of the steel sheet member, and the side of the channel steel is connected to the steel sheet member. A soil-confining cavity is formed by the enclosure of the channel steel and the steel sheet member. By setting the combination of the steel sheet member and the channel steel, on the one hand, a tubular-like structure is formed, greatly improving the bending resistance and anchoring stability. On the other hand, a soil-confining cavity is formed, and the dense soil in the soil-confining cavity is used as part of the steel sheet pile, that is, the steel sheet pile forms a retaining wall-like structure to jointly resist the pressure of the surrounding soil, thereby greatly improving the bearing capacity.

Description

Technical Field

[0001] The present application relates to the field of pipeline foundation pit construction, and particularly relates to a steel sheet pile support structure for a pipeline foundation pit and a construction method thereof. Background Art

[0002] To achieve the treatment and transportation of tap water, a water plant buries various water pipelines underground. From the water intake point to the water treatment unit and finally the outward transportation of tap water, etc., are all carried out by water pipelines.

[0003] When carrying out the construction of water supply pipeline paving, especially for large-diameter pipelines such as DN1800 steel pipes, there are often excavations of pipe trench foundation pits and the construction of foundation pit supports. The common pipeline foundation pit support is a steel sheet pile support.

[0004] A steel sheet pile is a type of profiled steel with a locking groove. Its cross-section has a straight plate type, a groove type, and a Z type. Through the connection of the locking grooves, the steel sheet piles can be freely combined to form a continuous and tight soil-retaining or water-blocking steel structure. Due to the high strength of the steel sheet piles themselves, they are easy to drive into hard soil layers, the construction is simple, the safety is high, and they can be reused, so they are widely used in the construction of pipeline foundation pit supports.

[0005] Regarding the above related technologies, the inventor believes that the steel plate structure enclosure has a relatively large area for resisting the surrounding soil, that is, a relatively high bearing capacity is required. However, the plate structure of the existing steel plate enclosure is relatively thin, and the anchoring method is simply inserted into the soil. Therefore, through comprehensive analysis, the bearing capacity of the steel plate enclosure is limited. Summary of the Invention

[0006] In order to improve the bearing capacity of the support, the present application provides a steel sheet pile support structure for a pipeline foundation pit and a construction method thereof.

[0007] A steel sheet pile support structure for a pipeline foundation pit provided by the present application adopts the following technical solution:

[0008] A steel sheet pile support structure for a pipeline foundation pit includes a plurality of steel plate members and channel steels. The steel plate members include main plates. On both sides in the width direction of the main plates, wing plates are formed by being bent obliquely in the same direction. The steel plate members are in a "︹" shape. The openings of adjacent steel plate members are arranged in opposite directions. The opening of the channel steel is arranged opposite to the opening of the steel plate member. The side of the channel steel is connected to the steel plate member. The channel steel and the steel plate member enclose a soil-confining cavity.

[0009] By adopting the above technical scheme, by arranging a combination of steel plates and channel steels, firstly, a tubular structure is formed, and the bending resistance and anchoring stability are greatly improved; secondly, a soil trapped cavity is formed, so that the dense soil in the soil trapped cavity is used as a part of the steel sheet piles, that is, the steel sheet piles form a retaining wall-like structure to jointly resist the pressure of the surrounding soil, thereby greatly improving the bearing capacity; thirdly, the anchoring area of ​​the combination of steel plates and channel steels and the soil is increased, thereby increasing the anchoring stability.

[0010] Optionally, the channel steel with its opening direction facing the pipeline foundation pit is named as the first channel steel, and the first channel steel includes a first web and first side plates fixed on both sides of the first web in the width direction, wherein the first web is arranged opposite to the main board of the corresponding steel plate member, and the side edge of the first side plate is connected to the wing plate; the first side plate and the first web are both inclined, and the horizontal distance between the first web and the main board gradually increases from top to bottom, and the horizontal distance between the two first webs gradually increases from top to bottom.

[0011] By adopting the above technical scheme, firstly, the soil-trapped cavity is made into a shape with a large lower end and a small upper end. Therefore, during the insertion process of the first channel steel, the oblique accumulation of its inner surface is utilized to further compact the soil in the soil-trapped cavity, so as to form a soil with a small upper end and a large lower end. The compacted soil can further improve the lateral pressure resistance of the overall structure. Secondly, due to the shape of the soil in the soil-trapped cavity, it is easier to disassemble the first channel steel upward (similar to the mold demolding process), thereby reducing the difficulty of subsequent disassembly. Thirdly, the outer surface of the first web is also an inclined surface. Therefore, when the pressure level of the outer soil is transmitted to the first web, it will be guided and dispersed by the outer surface of the first web, thereby improving the lateral pressure resistance of the overall structure in disguise.

[0012] Optionally, the channel steel with its opening direction facing away from the pipeline foundation pit is named as the second channel steel, and the second channel steel includes a second web and second side plates fixed on both sides of the second web in the width direction, wherein the second web is arranged opposite to the main board of the corresponding steel plate, and the side edges of the second side plates are connected to the wing plates; the second side plates and the second webs are both vertically arranged, and the inner surfaces of the second webs and the second side plates are both inclined surfaces, and the horizontal distance between the inner surface of the second web and the inner surface of the main board gradually increases from top to bottom, and the horizontal distance between the inner surfaces of the two second webs gradually increases from top to bottom.

[0013] By adopting the above technical solutions, firstly, the soil-confining cavity is shaped with a larger lower end and a smaller upper end. Therefore, during the downward insertion of the second channel steel, the soil in the soil-confining cavity is further compacted by the oblique extrusion of its inner inclined surface to form a soil mass with a smaller upper end and a larger lower end. The compacted soil can further improve the lateral pressure resistance of the overall structure. Secondly, due to the shape of the soil in the soil-confining cavity, it is easier to disassemble the second channel steel upward (similar to the mold demolding process), thus reducing the subsequent disassembly difficulty. Thirdly, the outer surface of the second channel steel is a vertical plane, so it can reduce the disturbance to the already filled pipeline foundation pit during the upward extraction and disassembly process, and thus has a higher safety factor.

[0014] Optionally, the first side plate is perpendicular to the middle position of the surface of the flange of the corresponding steel plate member; the second side plate is perpendicular to the middle position of the surface of the flange of the corresponding steel plate member.

[0015] By adopting the above technical solutions, the cross-section of the soil-confining cavity is hexagonal, that is, the lower opening of the soil-confining cavity is more accessible to the soil, and more soil can ensure the compactness of the soil in the soil-confining cavity in the later stage, thereby improving the lateral pressure resistance of the overall structure.

[0016] Optionally, a first sliding block is provided on the side of the first side plate, and a first sliding groove for the first sliding block to slide vertically is provided on the flange; a second sliding block is provided on the side of the second side plate, and a second sliding groove for the second sliding block to slide vertically is provided on the flange.

[0017] By adopting the above technical solutions, the first channel steel and the second channel steel are detachably connected to the steel plate member respectively. Therefore, when it is necessary to disassemble and recycle the steel sheet pile later, the first channel steel and the second channel steel can be disassembled first, and finally the steel plate member can be disassembled. In this way, the disturbance to the soil can be greatly reduced.

[0018] Optionally, it further includes a curing agent release structure for spraying a soil curing agent on the outer peripheral side of the soil-confining cavity.

[0019] By adopting the above technical solutions, by setting the curing agent release structure, firstly, the outer surface of the soil in the soil-confining cavity is relatively dense and stable, so as to improve the lateral pressure resistance. Secondly, it is convenient for subsequent upward disassembly, that is, it reduces the driving of the soil to move upward together during the disassembly process, effectively reducing the disturbance and the disassembly difficulty.

[0020] Optionally, the curing agent release structure includes a curing agent tank and a conveying steel pipe. The liquid infusion end of the curing agent tank is sequentially connected with an electric pump and a conveying hose. A plurality of through holes are vertically formed in both the channel steel and the steel plate member. The lower end of the through hole is communicated with the soil-confining cavity through a through port formed in the opposite surfaces of the channel steel and the steel plate member. The upper end of the conveying steel pipe is connected to the conveying hose, and the lower end of the conveying steel pipe is inserted into the through hole and is communicated with the through port.

[0021] By adopting the above technical solution, through the electric transmission method, the curing agent is sequentially passed through the conveying hose, the conveying steel pipe, and the through port from the curing agent tank and enters the soil-confining cavity. And since the through port is located at the lower end of the channel steel, during the downward movement of the channel steel, the curing agent can be evenly released, so that the outer surface of the soil in the soil-confining cavity can come into contact with the curing agent, facilitating uniform curing. Moreover, the conveying steel pipe is detachable, that is, it can be reused in different channel steels and steel plate members.

[0022] Optionally, the curing agent release structure includes a curing agent tank and a pressing pump body disposed in the middle of the inner surface of the channel steel. The channel steel is provided with a conveying channel. The upper end of the conveying channel is communicated with the curing agent tank through a conveying hose, and the lower end of the conveying channel is communicated with the soil-confining cavity. The suction and discharge end of the pressing pump body is communicated with the middle of the conveying channel. The pressing surface of the pressing pump body is flush with the corresponding inner surface of the channel steel, and the pressing direction of the pressing pump body is perpendicular to the corresponding inner surface of the channel steel.

[0023] By adopting the above technical solution, since the inner surface of the channel steel is an inclined surface, during the downward insertion of the channel steel, the reaction force of the soil will be stably applied to the pressing surface of the pressing pump body, thereby converting it into the power for releasing the curing agent. And during the downward insertion of the channel steel, it is vibrated downward. Therefore, when the channel steel vibrates upward, the pressing surface of the pressing pump body will quickly separate from the soil, that is, the pressing surface of the pressing pump body will lose the soil pressure, and the pressing end of the pressing pump body will reset to facilitate sucking the curing agent.

[0024] A construction method of a pipeline foundation pit steel sheet pile support structure provided by the present application adopts the following technical solution:

[0025] A construction method of a pipeline foundation pit steel sheet pile support structure includes the following steps:

[0026] S1. Construction preparation;

[0027] S2. Driving the steel sheet piles: First, connect the channel steel and the corresponding steel plate member, and then use the single driving method to drive the connected channel steel and steel plate member in sequence along the length direction of the pipeline foundation pit.

[0028] Optionally, in step S3, when the channel steel is connected to the steel plate, an anchor cable is tied and fixed at the lower end of the channel steel with the opening facing away from the pipeline foundation pit, and the other end of the anchor cable passes upward through the soil cavity and extends to the top of the channel steel. After the channel steel and the steel plate are driven into the soil, the upper end of the anchor cable is straightened in the direction away from the pipeline foundation pit and fixed to the surrounding soil with an anchor rod.

[0029] By adopting the above technical solution and setting the anchor cable in a tensioned state, the lateral pressure resistance of the steel sheet piles can be effectively improved.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. By arranging a combination of steel plates and channel steels, on the one hand, a tubular structure is formed, and the bending resistance and anchoring stability are greatly improved. On the other hand, a soil cavity is formed, so that the dense soil in the soil cavity is used as a part of the steel sheet piles, that is, the steel sheet piles form a retaining wall structure to jointly resist the pressure of the surrounding soil, thereby greatly improving the pressure bearing capacity;

[0032] 2. By limiting the shapes of the first channel steel and the second channel steel, firstly, the soil in the trapped soil cavity is further compacted, and the lateral pressure resistance of the overall structure is further improved; secondly, the difficulty of subsequent disassembly is reduced; thirdly, the guiding force of the outer slope is utilized to improve the lateral pressure resistance of the overall structure in disguised form;

[0033] 3. By setting up a curing agent release structure, on the one hand, the outer surface of the soil in the trapped soil cavity is made denser and more stable to improve the ability to resist lateral pressure. On the other hand, it is convenient for subsequent upward removal and disassembly, that is, the upward movement of the soil during the disassembly process is reduced, effectively reducing disturbance and reducing the difficulty of disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0035] Figure 2 It is a partial schematic diagram of the top view of Example 1.

[0036] Figure 3 4 is a cross-sectional view of the first channel steel of Example 1.

[0037] Figure 4 4 is a cross-sectional view of the second channel steel of Example 1.

[0038] Figure 5 Schematic diagram of the curing agent release structure of Example 2.

[0039] Figure 6 It is a cross-sectional view of the channel steel of Example 3.

[0040] Figure 7 is Figure 6 The partial enlarged view of position A in it.

[0041] Explanation of reference numerals: 1, steel plate part; 2, channel steel; 3, cross bar; 4, anchor cable; 10, soil confinement cavity; 11, main board; 12, wing plate; 13, first chute; 14, second chute; 15, through hole; 21, first channel steel; 211, first web; 212, first side plate; 213, first slider; 22, second channel steel; 221, second web; 222, second side plate; 223, second slider; 23, conveying channel; 24, avoidance groove; 25, sliding hole; 41, anchor rod; 51, curing agent tank; 52, electric pump; 521, conveying hose; 53, conveying steel pipe; 54, pressing pump body; 541, pump block; 542, pressing round block; 543, spring; 544, first one-way valve; 545, second one-way valve. Detailed implementation manners

[0042] The following further elaborates on this application Figures 1-7 in conjunction with the attached drawings.

[0043] Embodiment 1 of this application discloses a steel sheet pile support structure for a pipeline foundation pit.

[0044] Referring to Figure 1 , Figure 2 , the steel sheet pile support structure for a pipeline foundation pit includes multiple steel plate parts 1, channel steels 2 and cross bars 3. Among them, the steel plate part 1 includes a main board 11, and wing plates 12 are formed by being bent obliquely in the same direction on both sides in the width direction of the main board 11, so that the steel plate part 1 is in a "︹" shape. Moreover, locking grooves are provided on the sides of the wing plates 12. Therefore, adjacent steel plate parts 1 are connected through the locking grooves on their own sides, so that the openings of adjacent steel plate parts 1 are arranged in opposite directions, that is, the openings of some steel plate parts 1 face the pipeline foundation pit, and the openings of the other part of the steel plate parts 1 face away from the pipeline foundation pit.

[0045] As Figure 2 shown, the opening of the channel steel 2 is arranged opposite to the opening of the steel plate part 1, and a soil confinement cavity 10 is formed by the channel steel 2 and the steel plate part 1 enclosing each other. Specifically, the channel steel 2 with the opening direction facing the pipeline foundation pit is named the first channel steel 21, and the channel steel 2 with the opening direction facing away from the pipeline foundation pit is named the second channel steel 22; among them, the first channel steel 21 includes a first web 211 and first side plates 212 fixed on both sides in the width direction of the first web 211. The first web 211 is arranged opposite to the main board 11 of the corresponding steel plate part 1. The first side plates 212 are perpendicular to the middle positions of the surfaces of the wing plates 12 of the corresponding steel plate parts 1. Moreover, first sliders 213 are provided on the sides of the first side plates 212, and first chutes 13 are vertically penetrated and opened on the inner surfaces of the wing plates 12. The first sliders 213 are slidably connected with the first chutes 13.

[0046] As shown Figure 3 in Figure 3 , both the first side plate 212 and the first web 211 are inclined. Specifically, the horizontal distance between the first web 211 and the main board 11 gradually increases from top to bottom, and the horizontal distance between the two first webs 211 also gradually increases from top to bottom. That is, the upper end of the soil-trapping cavity 10 formed between the first channel steel 21 and the corresponding steel plate member 1 is small, and the lower end is large.

[0047] As shown Figure 2 in Figure 2 , the second channel steel 22 includes a second web 221 and second side plates 222 fixed to both sides in the width direction of the second web 221. The second web 221 is disposed opposite to the main board 11 of the corresponding steel plate member 1. The second side plates 222 are perpendicular to the middle position of the surface of the wing plate 12 of the corresponding steel plate member 1. And a second slider 223 is provided on the side of the second side plate 222, and a second chute 14 is vertically penetrated through the inner surface of the wing plate 12. The second slider 223 is slidably connected to the second chute 14.

[0048] As shown Figure 4 in Figure 4 , both the second side plate 222 and the second web 221 are vertically arranged, and the inner surfaces of the second web 221 and the second side plate 222 are both inclined planes, so that the horizontal distance between the inner surface of the second web 221 and the inner surface of the main board 11 gradually increases from top to bottom, and the horizontal distance between the inner surfaces of the two second webs 221 gradually increases from top to bottom. That is, the upper end of the soil-trapping cavity 10 formed between the second channel steel 22 and the corresponding steel plate member 1 is small, and the lower end is large.

[0049] Embodiment 1 also discloses a construction method for a steel sheet pile support structure of a pipeline foundation pit, including the following steps:

[0050] S1. Construction preparation: Measure and set the pipeline center line, and release the trench side line and the boundaries for stacking soil and materials; conduct the hoisting and stacking of the steel plate member 1 and the channel steel 2. The stacking location is selected on a flat and solid site that will not undergo large settlement deformation due to the weight, and is convenient for transporting to the piling construction site.

[0051] S2. Driving of the steel sheet pile support, including the following steps:

[0052] S2.1. Driving of the steel plate member 1 and the channel steel 2: Through the sliding connection, the channel steel 2 and the steel plate member 1 have been pre-connected, and then by using the vibration piling method, the combination of the steel plate member 1 and the channel steel 2 is simultaneously driven into the soil, and then the connected channel steel 2 and steel plate member 1 are successively driven along the length direction of the pipeline foundation pit.

[0053] During this period, during the driving of the sheet piles in the middle section of the length of the pipeline foundation pit, one end of the anchor cable 4 is first fixed to the lower end of the corresponding channel steel 2. The specific fixing method can be that a connecting ring is welded to the lower end of the channel steel 2, and the end of the anchor cable 4 is tied to the connecting ring. The other end of the anchor cable 4 passes upward through the soil-confining cavity 10 and extends above the channel steel 2 and is placed on the ground. After the channel steel 2 and the steel plate member 1 are driven into the soil, the upper end of the anchor cable 4 is straightened along the direction away from the pipeline foundation pit, and then the upper end of the anchor cable 4 is fixed to the surrounding soil by the anchor rod 41 (such as Figure 1 as shown).

[0054] S2.2. Excavate the trench, and then horizontally arrange the cross bar 3 along the width direction of the pipeline foundation pit, and both ends of the cross bar 3 are fixedly connected to the sheet piles on one side, and the sheet pile support structure is completed.

[0055] When the sheet pile support structure needs to be disassembled, first disassemble the cross bar 3, and then sequentially disassemble the sheet piles in the reverse driving direction. Specifically, first separately pull out the channel steel 2 upward in sequence to reduce soil disturbance until all the channel steel 2 is pulled out, and then sequentially pull out the steel plate member 1 one by one upward.

[0056] The implementation principle of Embodiment 1 is as follows: First, the combination of the steel plate member 1 and the channel steel 2 can form a tubular-like structure, greatly improving the bending resistance and anchoring stability. Second, the combination of the steel plate member 1 and the channel steel 2 forms a soil-confining cavity 10, and during the downward insertion of the channel steel 2, the soil in the soil-confining cavity 10 is further compacted by the oblique extrusion of its inner surface to form a soil body with a small upper end and a large lower end. The dense soil in the soil-confining cavity 10 serves as part of the sheet pile, that is, the sheet pile forms a retaining wall-like structure to jointly resist the pressure of the surrounding soil, thereby greatly improving the bearing capacity; and, the upward disassembly of the channel steel 2 is easier (similar to the mold demolding process), thus reducing the subsequent disassembly difficulty.

[0057] Embodiment 2 is different from Embodiment 1 in that, as Figure 5 shown, the pipeline foundation pit sheet pile support structure further includes a curing agent release structure for spraying soil curing agent on the outer peripheral side of the soil-confining cavity 10. A plurality of through holes 15 are vertically penetrated through the upper surfaces of the channel steel 2 and the steel plate member 1, and the lower ends of the through holes 15 are communicated with the soil-confining cavity 10 through openings formed on the opposite surfaces of the channel steel 2 and the steel plate member 1.

[0058] The curing agent release structure includes a curing agent tank 51 and a delivery steel pipe 53. The liquid delivery end of the curing agent tank 51 is sequentially connected with an electric pump 52 and a delivery hose 521. One end of the delivery hose 521 is connected to the delivery steel pipe 53. The delivery steel pipe 53 is in plug-in fit with the through hole 15, and the lower end of the delivery steel pipe 53 is communicated with the opening.

[0059] First, insert the conveying steel pipe 53 into the through holes 15 of the pre-inserted channel steel 2 and the steel plate member 1 in a plug-in fit. During the downward insertion process of the steel plate member 1, the electric pump 52 is started to sequentially pass the curing agent from the curing agent tank 51 through the conveying hose 521, the conveying steel pipe 53, and the through port, and then enter the soil-confining cavity 10. And during the downward movement of the channel steel 2, the curing agent is evenly released so that the outer surface of the soil in the soil-confining cavity 10 can come into contact with the curing agent, causing the outer surface of the soil in the soil-confining cavity 10 to solidify, making it relatively dense and stable, so as to improve the lateral pressure resistance. And the dense and stable soil can reduce the upward movement of the soil driven by the removal of the channel steel 2 or the steel plate member 1, that is, effectively reduce the disturbance and the removal difficulty.

[0060] After the corresponding channel steel 2 or steel plate member 1 is inserted downward, the conveying steel pipe 53 is pulled out upward for use in the next steel sheet pile, that is, recycled.

[0061] Embodiment 3 is different from Embodiment 2 in that, as Figure 6 、 Figure 7 shown, the curing agent release structure includes a curing agent tank 51 (not marked in the figure) and a pressing pump body 54 provided in the middle of the inner surface of the channel steel 2. Specifically, a conveying channel 23 is opened downward on the upper surface of the channel steel 2. The upper end of the conveying channel 23 is detachably connected to the curing agent tank 51 through a conveying hose 521, and the lower end of the conveying channel 23 communicates with the soil-confining cavity 10.

[0062] The pressing pump body 54 includes a pump block 541 and a pressing circular plate fixed to one end of the pump block 541. An avoidance groove 24 is opened in the lower part of the inner surface of the channel steel 2. A sliding hole 25 is opened between the avoidance groove 24 and the conveying channel 23. The pump block 541 is slidably connected with the sliding hole 25 along the direction perpendicular to the inner surface of the channel steel 2. The pressing circular block 542 is located in the avoidance groove 24, and the end face of the pressing circular block 542 is flush with the inner surface of the channel steel 2. A spring 543 is provided in the avoidance groove 24, and the spring 543 is used to force the pressing circular block 542 to slide toward the middle of the soil-confining cavity 10; a first one-way valve 544 is provided in the upper part of the conveying channel 23, and a second one-way valve 545 is provided in the lower part of the conveying channel 23.

[0063] During the downward insertion process of the channel steel 2, the reaction force of the soil in the soil-confining cavity 10 will be stably applied to the end face of the pressing circular block 542 to pressurize the curing agent so that it flows into the soil-confining cavity 10 through the second one-way valve 545. Since the channel steel 2 is inserted downward in a vibrating manner during the downward insertion process, when the channel steel 2 vibrates upward, the pressing circular block 542 will quickly move upward away from the soil. Therefore, under the elastic force of the spring 543, the pump block 541 resets to suck the curing agent into the area between the first one-way valve 544 and the second one-way valve 545 of the conveying channel 23 for subsequent pressurization.

[0064] That is, the force between the channel steel 2 and the soil body is converted into the driving force released by the curing agent, and the timing of the release of the curing agent is adapted to the timing of the contact between the channel steel 2 and the soil body, so as to ensure that the soil body can effectively receive the curing agent, thereby greatly improving the utilization rate and effect of the curing agent.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A steel sheet pile support structure for a pipeline foundation pit, characterized in that: It includes multiple steel plate members (1), channel steels (2) and a curing agent release structure. The steel plate member (1) includes a main board (11). Wings (12) are formed by being bent obliquely in the same direction on both sides of the main board (11) in the width direction. The steel plate member (1) is in a "︹" shape. The openings of adjacent steel plate members (1) are arranged in opposite directions. The opening of the channel steel (2) is arranged opposite to the opening of the steel plate member (1). The side of the channel steel (2) is connected to the steel plate member (1). A soil-confining cavity (10) is formed by the enclosure of the channel steel (2) and the steel plate member (1). The channel steel (2) with the opening direction facing the pipe foundation pit is named the first channel steel (21). The first channel steel (21) includes a first web (211) and first side plates (212) fixed to both sides of the first web (211) in the width direction. Among them, the first web (211) is arranged opposite to the main board (11) of the corresponding steel plate member (1), and the side of the first side plate (212) is connected to the wing (12). The first side plate (212) and the first web (211) are both inclined. The horizontal distance between the first web (211) and the main board (11) gradually increases from top to bottom, and the horizontal distance between the two first webs (211) gradually increases from top to bottom. The channel steel (2) with the opening direction away from the pipe foundation pit is named the second channel steel (22). The second channel steel (22) includes a second web (221) and second side plates (222) fixed to both sides of the second web (221) in the width direction. Among them, the second web (221) is arranged opposite to the main board (11) of the corresponding steel plate member (1), and the side of the second side plate (222) is connected to the wing (12). The second side plate (222) and the second web (221) are both vertically arranged. The inner surfaces of the second web (221) and the second side plates (222) are both inclined planes. The horizontal distance between the inner surface of the second web (221) and the inner surface of the main board (11) gradually increases from top to bottom, and the horizontal distance between the inner surfaces of the two second webs (221) gradually increases from top to bottom. The curing agent release structure is used to spray soil curing agent on the outer peripheral side of the soil-confining cavity (10). The curing agent release structure includes a curing agent tank (51) and a push-type pump body (54) arranged in the middle of the inner surface of the channel steel (2). The channel steel (2) is provided with a conveying channel (23). The upper end of the conveying channel (23) is communicated with the curing agent tank (51) through a conveying hose (521). The lower end of the conveying channel (23) is communicated to the soil-confining cavity (10). The suction and discharge end of the push-type pump body (54) is communicated with the middle of the conveying channel (23). The pressing surface of the push-type pump body (54) is flush with the corresponding inner surface of the channel steel (2), and the pressing direction of the push-type pump body (54) is perpendicular to the corresponding inner surface of the channel steel (2).

2. The steel sheet pile support structure for the pipeline foundation pit according to claim 1, characterized in that: The first side plate (212) is perpendicular to the middle position of the surface of the wing plate (12) of the corresponding steel plate member (1); the second side plate (222) is perpendicular to the middle position of the surface of the wing plate (12) of the corresponding steel plate member (1).

3. The steel sheet pile support structure for the pipeline foundation pit according to claim 1, wherein: A first slider (213) is provided on the side of the first side plate (212), and a first chute (13) for the first slider (213) to slide vertically is provided on the wing plate (12); a second slider (223) is provided on the side of the second side plate (222), and a second chute (14) for the second slider (223) to slide vertically is provided on the wing plate (12).

4. A construction method of the steel sheet pile support structure for the pipeline foundation pit according to any one of claims 1-3, characterized in that: It includes the following steps: S1. Construction preparation; S2. Driving of steel sheet piles: The channel steel (2) and the corresponding steel plate member (1) are pre-connected, and then the connected channel steel (2) and steel plate member (1) are driven in sequence along the length direction of the pipeline foundation pit by the single driving method.

5. The construction method of the steel sheet pile support structure for the pipeline foundation pit according to claim 4, characterized in that: In step S3, when the channel steel (2) and the steel plate member (1) are connected, the anchor cable (4) is tied and fixed at the lower end of the channel steel (2) with the opening facing away from the pipeline foundation pit, and the other end of the anchor cable (4) passes upward through the soil-confining cavity (10) and extends above the channel steel (2). After the channel steel (2) and the steel plate member (1) are driven into the soil, the upper end of the anchor cable (4) is straightened along the direction away from the pipeline foundation pit and fixed in the surrounding soil by the anchor rod (41).

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