Water stop type supporting system and method

Abstract

According to the water stop type supporting system and method, steel water stop fender posts, profile steel enclosing purlins, umbrella-shaped expansion mechanisms and steel advance inclined struts are adopted, after the lower ends of the steel advance inclined struts reach a certain depth of a soil body, the umbrella-shaped expansion mechanisms expand under the action of soil body resistance, and the upper ends of the steel advance inclined struts are connected with the profile steel enclosing purlins; the steel water stop fender post composed of the first type of H-shaped steel piles and the second type of H-shaped steel piles is adopted, the advantage that the rigidity of H-shaped steel is large can be brought into full play, the flange plates, facing the profile steel circuit purlins, on the second type of H-shaped steel piles are arranged in an extending mode towards the two sides, and the flange plates, facing the profile steel circuit purlins, on the adjacent first type of H-shaped steel piles and the second type of H-shaped steel piles are connected through rabbets. By additionally arranging the umbrella-shaped expanding mechanism, the supporting force of the steel advance inclined strut in a shallow soil layer is improved, the pile length of the steel advance inclined strut is shortened, connection of the enclosure body and the steel advance inclined strut is rapidly achieved through the structural steel enclosing purlin, and overall stress of the supporting system is achieved.

Description

Technical Field

[0001] The invention belongs to the field of underground engineering, and in particular relates to a water-stopping support system and method. Background Art

[0002] For foundation pits with shallow excavation depth (h≤7m), when the area of ​​the foundation pit is large or the distance between the foundation pit edge and the land red line is insufficient to adopt gravity dam and double-row pile enclosure, the inclined support scheme is generally adopted, combined with the construction method of the central island. The conventional inclined support scheme can save the engineering volume and cost of supports and columns, facilitate large-scale excavation, improve excavation efficiency, and save construction period. However, this method also has some disadvantages, such as complex construction procedures, cumbersome construction processes, difficult excavation of soil at the edge of the pit, the need for secondary pouring of the bottom plate, and the risk of leakage after cutting the bottom plate of the main building. Traditional steel sheet piles have small overall stiffness, large deformation, and low construction efficiency due to the small thickness of a single steel sheet pile (400mm wide or 600mm wide). H-shaped steel has high stiffness, but cannot stop water. When used in foundation pit projects, soil is easily left between two H-shaped steels.

[0003] In response to the above shortcomings, a self-stabilizing foundation pit support structure system using advanced diagonal bracing piles instead of diagonal bracing has appeared on the market. Unlike the diagonal bracing scheme, which first excavates the soil in the middle of the foundation pit and then casts and cures the bottom plate to the designed strength before constructing the diagonal bracing, the advanced diagonal bracing can be driven into the soil before the foundation pit is excavated using special construction equipment, forming a force support system together with the retaining body, thereby avoiding the secondary pouring of the foundation bottom plate. At present, the commonly used advanced diagonal bracing generally uses small-diameter steel pipe piles combined with post-grouting to form a combined steel pipe pile reinforcement body, or directly uses prefabricated reinforced concrete rectangular piles. In the soft soil area of ​​Shanghai, there is a thick and weak soil layer in the shallow part, and the side resistance and end resistance of the advanced diagonal bracing are weak, and it cannot provide sufficient support in the shallow soil layer. Therefore, the advanced diagonal bracing needs to enter the deep soil layer, the pile body is long, and the construction difficulty and project cost are high. At the same time, the connection between the advanced diagonal brace and the retaining structure adopts a cast-in-place reinforced concrete ring beam, which requires tying steel bars and curing concrete. The construction process is complicated and the construction period is long. Ultimately, a lot of waste concrete is generated, which is not environmentally friendly. Summary of the invention

[0004] The present invention proposes a high-bearing capacity water-stopping support system that can be quickly constructed, which solves the problems of low stiffness and large deformation of existing steel sheet piles, inability of H-shaped steel piles to stop water, inability of advanced diagonal bracing to provide sufficient supporting force in shallow soil layers, and long construction period of cast-in-place reinforced concrete ring beams.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A water-stopping support system, comprising a steel water-stopping retaining pile, a steel purlin, an umbrella-shaped expansion mechanism and a steel advanced diagonal brace, wherein the steel water-stopping retaining pile comprises a first type H-shaped steel pile and a second type H-shaped steel pile, wherein the first type H-shaped steel pile and the second type H-shaped steel pile are alternately driven in sequence, wherein the steel purlin is arranged on the upper side of the steel water-stopping retaining pile, and the flange plate of the second type H-shaped steel pile facing the steel purlin is extended to both sides, and the adjacent first type H-shaped steel piles and the second type H-shaped steel piles are arranged on the upper side of the steel water-stopping retaining piles. The flange plate of the H-shaped steel pile facing the steel purlin is connected through a tongue and groove connection. The umbrella-shaped expansion mechanism is arranged at the lower end of the steel advance diagonal brace. The umbrella-shaped expansion mechanism is in a contracted state in a natural state. After the lower end of the steel advance diagonal brace reaches a certain depth in the soil, the umbrella-shaped expansion mechanism expands under the action of the soil resistance. The upper end of the steel advance diagonal brace is connected to the steel purlin. There are multiple steel advance diagonal braces, and the multiple steel advance diagonal braces are arranged at equal intervals along the longitudinal direction of the steel purlin.

[0007] Preferably, in the above-mentioned water-stopping support system, the first type of H-shaped steel piles include two first flange plates, a first web plate and two first hook plates, the two ends of the first web plate are respectively vertically connected to the middle parts of the two first flange plates, the two first hook plates are symmetrically arranged on both sides of the first web plate, and the two first hook plates are arranged close to the steel purlin; the second type of H-shaped steel piles include two second flange plates, a second web plate and two second hook plates, the two ends of the second web plate are respectively vertically connected to the middle parts of the two second flange plates, the two ends of the second flange plate close to the steel purlin are respectively arranged with the second hook plates, the first flange plate far away from the steel purlin and the second flange plate far away from the steel purlin are equal in width, the width of the second flange plate close to the steel purlin is greater than that of the second flange plate close to the steel purlin The width of the first flange plate, the inner surface of the first flange plate on the first type H-shaped steel pile facing the steel purlin is fitted with the outer surface of the second flange plate on the second type H-shaped steel pile facing the steel purlin, the middle part of the second flange plate on the second type H-shaped steel pile facing the steel purlin is thickened, the width of the middle thickened part of the second flange plate on the second type H-shaped steel pile facing the steel purlin is equal to the width of the second flange plate on the second type H-shaped steel pile away from the steel purlin, and the flange plates on the adjacent first type H-shaped steel piles and the second type H-shaped steel piles facing the steel purlin are connected by tongue and groove, which means that the first flange plate on the first type H-shaped steel pile facing the steel purlin and the second flange plate on the adjacent second type H-shaped steel pile facing the steel purlin are hooked with each other through the corresponding first hook plate and second hook plate and are fitted with each other.

[0008] Preferably, in the above-mentioned water-stopping support system, the umbrella-type expansion mechanism includes an upper end plate, a lower end plate, a plurality of main rods, a plurality of auxiliary rods, a high-strength flexible membrane, a plurality of tension springs and a pile cap, the lower end plate and the lower end plate are both in annular shape, the upper end plate is fixedly sleeved on the outer wall of the steel advance diagonal brace, the lower end plate is sleeved on the outer side of the steel advance diagonal brace, the pile cap is fixedly arranged at the lower end of the steel advance diagonal brace, the lower end plate is located between the upper end plate and the pile cap, and the lower end plate can move along the axial direction of the steel advance diagonal brace; the plurality of main rods are radially arranged along the periphery of the upper end plate, and the upper ends of the main rods are respectively connected to the upper The main rod is hinged to the upper end plate; one end of the auxiliary rod is hinged to the middle part of the corresponding main rod, and the other end of the auxiliary rod is hinged to the lower end plate, and the high-strength flexible membrane covers the main rod; the plurality of tension springs are evenly arranged on the lower end plate, and the two ends of the tension spring are respectively connected to the lower end plate and the pile cap. The plurality of tension springs pull down the lower end plate so that the main rod is in a contracted state before the steel advance diagonal brace is buried and in the initial stage of burial. When the steel advance diagonal brace is driven into the soil to a certain depth, the soil resistance of the main rod and the high-strength flexible membrane assembly exceeds the tension of the tension spring, and the main rod is opened by the soil resistance, so that the umbrella-shaped expansion mechanism expands.

[0009] Preferably, in the above-mentioned water-stopping support system, the pile cap includes a disc portion and a cone portion, the upper surface of the disc portion is fixedly arranged on the lower end of the steel advance diagonal brace, and the cone portion is fixedly arranged on the lower surface of the disc portion, the disc portion is coaxially fixedly connected to the cone portion and the steel advance diagonal brace, respectively, the tip of the cone portion is arranged away from the disc portion, and the outer diameter of the disc portion is 3 to 5 cm larger than the outer diameters of the upper end and the lower end.

[0010] Preferably, in the above-mentioned water-stop support system, the steel purlin is supported by a plurality of brackets, and the plurality of brackets are arranged at equal intervals along the longitudinal direction of the steel purlin. The brackets include horizontal support rods and oblique support rods. The horizontal support rods are arranged horizontally and vertically connected to the steel purlin. The lower ends of the oblique support rods are fixedly connected to the steel purlin, and the upper ends of the oblique support rods are fixedly connected to the horizontal support rods. The connection between the oblique support rods and the horizontal support rods is arranged away from the steel purlin. The steel purlin includes two H-shaped steels and two connecting plates. The two H-shaped steels are arranged in parallel up and down, the webs of the two H-shaped steels are arranged horizontally, and the flanges of the two H-shaped steels are arranged vertically. The flanges on the same side of the two H-shaped steels are connected by corresponding connecting plates, and the outer surfaces of the flanges on the same side of the two H-shaped steels are fitted with the corresponding connecting plates. A plurality of reinforcing plates are provided at equal intervals on the upper side of the web of the upper H-shaped steel and the lower side of the web of the lower H-shaped steel.

[0011] A water-stopping support method, using the water-stopping support system as described above, comprises the following steps:

[0012] Step 1, constructing steel water-stopping retaining piles, wherein the steel water-stopping retaining piles include first-type H-shaped steel piles and second-type H-shaped steel piles, and the first-type H-shaped steel piles and the second-type H-shaped steel piles are driven in alternately in sequence;

[0013] Step 2, driving in a steel advance diagonal brace, and after the lower end of the steel advance diagonal brace reaches a certain depth, the umbrella-shaped expansion mechanism expands to a predetermined state;

[0014] Step 3, installing a steel purlin, wherein the steel purlin is arranged on the upper side of the steel water-stopping retaining pile;

[0015] Step 4: weld the upper end of the steel advance diagonal brace to the steel purlin to form a high-bearing capacity water-stop support system.

[0016] Preferably, in the water-stop support method as described above, the first type of H-shaped steel piles include two first flange plates, a first web plate and two first hook plates, the two ends of the first web plate are respectively vertically connected to the middle parts of the two first flange plates, the two first hook plates are symmetrically arranged on both sides of the first web plate, and the two first hook plates are arranged close to the steel purlin; the second type of H-shaped steel piles include two second flange plates, a second web plate and two second hook plates, the two ends of the second web plate are respectively vertically connected to the middle parts of the two second flange plates, the second hook plates are respectively arranged at the two ends of the second flange plate close to the steel purlin, the width of the first flange plate far away from the steel purlin and the second flange plate far away from the steel purlin are equal, the width of the second flange plate close to the steel purlin is greater than that of the second flange plate close to the steel purlin The width of the first flange plate, the inner surface of the first flange plate on the first type H-shaped steel pile facing the steel perimeter purlin is fitted with the outer surface of the second flange plate on the second type H-shaped steel pile facing the steel perimeter purlin, the middle part of the second flange plate on the second type H-shaped steel pile facing the steel perimeter purlin is thickened, the width of the middle thickened part of the second flange plate on the second type H-shaped steel pile facing the steel perimeter purlin is equal to the width of the second flange plate on the second type H-shaped steel pile far away from the steel perimeter purlin, and the flange plates on the adjacent first type H-shaped steel piles and the second type H-shaped steel piles facing the steel perimeter purlin are connected by tongue and groove, which means that the first flange plate on the first type H-shaped steel pile facing the steel perimeter purlin and the second flange plate on the adjacent second type H-shaped steel pile facing the steel perimeter purlin are hooked with each other through the corresponding first hook plate and second hook plate and are fitted with each other.

[0017] Preferably, in the water-stopping support method as described above, the umbrella-type expansion mechanism includes an upper end plate, a lower end plate, a plurality of main rods, a plurality of auxiliary rods, a high-strength flexible membrane, a plurality of tension springs and a pile cap, the lower end plate and the lower end plate are both in annular shape, the upper end plate is fixedly sleeved on the outer wall of the steel advance diagonal brace, the lower end plate is sleeved on the outer side of the steel advance diagonal brace, the pile cap is fixedly arranged at the lower end of the steel advance diagonal brace, the lower end plate is located between the upper end plate and the pile cap, and the lower end plate can move along the axial direction of the steel advance diagonal brace; the plurality of main rods are radially arranged along the periphery of the upper end plate, and the upper ends of the main rods are respectively connected to the upper end plate and the pile cap. The upper end plate is hinged; one end of the auxiliary rod is hinged to the middle part of the corresponding main rod, and the other end of the auxiliary rod is hinged to the lower end plate, and the high-strength flexible membrane covers the main rod; the plurality of tension springs are evenly arranged on the lower end plate, and the two ends of the tension spring are respectively connected to the lower end plate and the pile cap, and the plurality of tension springs pull down the lower end plate so that the main rod is in a contracted state before the steel advance diagonal brace is inserted into the soil and in the initial stage of insertion. When the steel advance diagonal brace is driven into the soil to a certain depth, the soil resistance of the main rod and the high-strength flexible membrane assembly exceeds the tension of the tension spring, and the main rod is opened by the soil resistance, so that the umbrella-shaped expansion mechanism expands.

[0018] Preferably, in the water-stopping support method as described above, the pile cap includes a disc portion and a cone portion, the upper surface of the disc portion is fixedly arranged on the lower end of the steel advance diagonal brace, and the cone portion is fixedly arranged on the lower surface of the disc portion, the disc portion is coaxially fixedly connected to the cone portion and the steel advance diagonal brace, respectively, the tip of the cone portion is arranged away from the disc portion, and the outer diameter of the disc portion is 3 to 5 cm larger than the outer diameters of the upper end and the lower end.

[0019] Preferably, in the water-stop support method as described above, the steel purlin is supported by a plurality of brackets, and the plurality of brackets are arranged at equal intervals along the longitudinal direction of the steel purlin, and the brackets include horizontal support rods and oblique support rods, the horizontal support rods are arranged horizontally and vertically connected to the steel purlin, the lower ends of the oblique support rods are fixedly connected to the steel purlin, the upper ends of the oblique support rods are fixedly connected to the horizontal support rods, and the connection between the oblique support rods and the horizontal support rods is arranged away from the steel purlin, and the The steel purlin includes two H-shaped steels and two connecting plates. The two H-shaped steels are arranged in parallel up and down, the webs of the two H-shaped steels are arranged horizontally, and the flanges of the two H-shaped steels are arranged vertically. The flanges on the same side of the two H-shaped steels are connected by corresponding connecting plates, and the outer surfaces of the flanges on the same side of the two H-shaped steels are fitted with the corresponding connecting plates. A plurality of reinforcing plates are provided at equal intervals on the upper side of the web of the upper H-shaped steel and the lower side of the web of the lower H-shaped steel.

[0020] It can be seen from the technical solutions disclosed above that, compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] In summary, the present invention provides a water-stopping support system and method.

[0022] The present invention provides a water-stopping support system and method, which adopts steel water-stopping retaining piles composed of first-class H-steel piles and second-class H-steel piles, which can give full play to the advantage of greater rigidity of H-steel, and by extending the flange plates of the second-class H-steel piles facing the steel purlin to both sides, that is, the extended flanges of the second-class H-steel piles, the flange plates of the adjacent first-class H-steel piles and the second-class H-steel piles facing the steel purlin are connected by tongue and groove, which can achieve water stopping and prevent soil flow between piles, improve the shortcomings of the existing H-steel piles with poor water stopping performance and easy soil flow, so that the adaptability of the support system in foundation pit support is further expanded; by adding an umbrella-type expansion mechanism The umbrella-shaped expansion mechanism is in a contracted state under natural conditions. After the lower end of the steel advance diagonal brace reaches a certain depth in the soil, the umbrella-shaped expansion mechanism expands under the action of soil resistance, thereby effectively improving the supporting force of the steel advance diagonal brace in the shallow soil layer and shortening the length of the steel advance diagonal brace pile; the use of steel purlins, steel water-stop retaining piles and steel advance diagonal braces can achieve rapid connection between the steel water-stop retaining piles and the steel advance diagonal brace, quickly realize the overall force of the support system, improve construction safety and efficiency, and effectively solve the problems of the steel advance diagonal brace being unable to provide sufficient supporting force in the shallow soil layer and the long construction period of the cast-in-place reinforced concrete ring beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the facade structure of a water-stop support system.

[0024] Figure 2 It is a schematic diagram of the plane structure of a water-stop support system.

[0025] Figure 3 It is a structural schematic diagram of the umbrella-shaped expansion mechanism in the retracted state.

[0026] Figure 4 It is a structural schematic diagram of the umbrella-type expansion mechanism in the expanded state.

[0027] Figure 5 yes Figure 4 Top view of the .

[0028] Figure 6 It is a structural diagram of steel water-stop retaining piles.

[0029] Figure 7 It is a structural diagram of the first type of H-shaped steel pile.

[0030] Figure 8 It is a structural diagram of the second type of H-shaped steel pile.

[0031] Fig. 9 It is a schematic diagram of the connection between the steel purlin and the steel water-stop retaining piles.

[0032] Fig.10 It is a structural schematic diagram of the umbrella-type expansion mechanism in the expanded state.

[0033] In the figure: 1-steel water-stop retaining pile, 11-first type H-steel pile, 111-first flange plate, 112-first web plate, 113-first hook plate, 12-second type H-steel pile, 121-second flange plate, 122-second web plate, 123-second hook plate, 2-steel purlin, 21-H-steel, 22-connecting plate, 23-reinforcement plate, 3-umbrella-shaped expansion mechanism, 31-upper end plate, 32-lower end plate, 33-main rod, 34-secondary rod, 35-high-strength flexible membrane, 36-tension spring, 37-pile cap, 38-reinforcement rib plate, 4-steel advanced diagonal brace, 5-bracket, 51-diagonal support rod, 52 horizontal support rod. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The technical content and features of the present invention will be described in detail below by combining the enumerated embodiments with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the accompanying drawings, but this cannot be a limitation of the technical solution of the present invention.

[0035] See also Figures 1 to 10 The present embodiment discloses a water-stopping support system, comprising a steel water-stopping retaining pile 1, a steel purlin 2, an umbrella-shaped expansion mechanism 3 and a steel advanced diagonal brace 4, wherein the steel water-stopping retaining pile 1 comprises a first type H-shaped steel pile 11 and a second type H-shaped steel pile 12, wherein the first type H-shaped steel pile 11 and the second type H-shaped steel pile 12 are alternately driven in sequence, wherein the steel purlin 2 is arranged on the upper side of the steel water-stopping retaining pile 1, and the flange plates of the second type H-shaped steel pile 12 facing the steel purlin 2 are extended to both sides, and the adjacent first type The flange plates of the H-shaped steel piles 11 and the second type H-shaped steel piles 12 facing the steel purlin 2 are connected by tongue and groove. The umbrella-shaped expansion mechanism 3 is arranged at the lower end of the steel advance diagonal brace 4. The umbrella-shaped expansion mechanism 3 is in a contracted state in a natural state. After the lower end of the steel advance diagonal brace 4 reaches a certain depth of the soil, the umbrella-shaped expansion mechanism expands under the action of the soil resistance. The upper end of the steel advance diagonal brace 4 is connected to the steel purlin 2. There are multiple steel advance diagonal braces 4, and the multiple steel advance diagonal braces 4 are arranged at equal intervals along the longitudinal direction of the steel purlin 2.

[0036] The present invention provides a water-stopping support system. By adopting a steel water-stopping retaining pile 1 composed of a first type H-steel pile 11 and a second type H-steel pile 12, the advantage of the greater rigidity of the H-steel is fully utilized. By extending the flange plates of the second type H-steel pile 12 facing the steel purlin to both sides, that is, extending the flanges of the second type H-steel pile, the flange plates of the adjacent first type H-steel piles 11 and the second type H-steel piles 12 facing the steel purlin 2 are connected by tongue and groove, which can effectively achieve water stopping and prevent soil flow between piles, thereby improving the shortcomings of the existing H-steel piles with poor water stopping performance and easy soil flow, so that the adaptability of the support system in foundation pit support is further expanded; by adding an umbrella-type expansion mechanism 3. The umbrella-shaped expansion mechanism 3 is in a contracted state in a natural state. After the lower end of the steel advance diagonal brace 4 reaches a certain depth in the soil, the umbrella-shaped expansion mechanism 3 expands under the action of the soil resistance, thereby effectively improving the supporting force of the steel advance diagonal brace 4 in the shallow soil layer and shortening the pile length of the steel advance diagonal brace 4. The steel purlin 2, the steel water-stop retaining pile 1 and the steel advance diagonal brace 4 are adopted to realize the rapid connection of the steel water-stop retaining pile 1 and the steel advance diagonal brace 4, quickly realize the overall force of the support system, improve the construction safety and construction efficiency, and effectively solve the problems that the steel advance diagonal brace 4 cannot provide sufficient supporting force in the shallow soil layer and the cast-in-place reinforced concrete ring beam has a long construction period.

[0037] Preferably, in the above-mentioned water-stopping support system, the first type H-shaped steel pile 11 includes two first flange plates 111, a first web 112 and two first hook plates 113, the two ends of the first web 112 are respectively vertically connected to the middle of the two first flange plates 111, the two first hook plates 113 are symmetrically arranged on both sides of the first web 112, and the two first hook plates 113 are arranged close to the steel purlin 2. The second type H-shaped steel pile 12 includes two second flange plates 121, a second web plate 122 and two second hook plates 123, the two ends of the second web plate 122 are respectively vertically connected to the middle parts of the two second flange plates 121, the two ends of the second flange plate 121 close to the steel purlin 2 are respectively provided with the second hook plates 123, the first flange plate 111 away from the steel purlin 2 and the second flange plate 121 away from the steel purlin 2 are equal in width, the width of the second flange plate 121 close to the steel purlin 2 is greater than the width of the first flange plate 111 close to the steel purlin 2, the inner surface of the first flange plate 111 on the first type H-shaped steel pile 11 facing the steel purlin 2 and the second flange plate 111 on the second type H-shaped steel pile 11 facing the steel purlin 2 21 is fitted on the outer surface, the middle part of the second flange plate 121 on the second type H-shaped steel pile 11 facing the steel purlin 2 is thickened, and the width of the middle thickened part of the second flange plate 121 on the second type H-shaped steel pile 11 facing the steel purlin 2 is equal to the width of the second flange plate 121 on the second type H-shaped steel pile 11 away from the steel purlin 2, and the flange plates on the adjacent first type H-shaped steel piles 11 and second type H-shaped steel piles 12 facing the steel purlin 2 are connected by tongue and groove, which means that the first flange plate 111 on the first type H-shaped steel pile 11 facing the steel purlin 2 and the second flange plate 121 on the adjacent second type H-shaped steel pile 12 facing the steel purlin 2 are hooked and fitted to each other through the corresponding first hook plate 113 and second hook plate 123. As can be seen from the above. The steel water-stop retaining pile 1 adopts the first type H-shaped steel pile 11 and the second type H-shaped steel pile 12. The first type H-shaped steel pile 11 is formed by adding two first hook plates 113 to the existing H-shaped steel pile. The second type H-shaped steel pile 12 is extended with a flange plate relative to the existing H-shaped steel pile and is additionally provided with a second hook plate 123, which can give full play to the advantage of the greater rigidity of the H-shaped steel. Moreover, by extending the flange of the special H-shaped steel pile, the first flange plate 111 on the first type H-shaped steel pile 11 facing the steel purlin 2 and the second flange plate 121 on the adjacent second type H-shaped steel pile 12 facing the steel purlin 2 are hooked and connected to each other through the corresponding first hook plates 113 and second hook plates 123, which can effectively stop water and prevent soil flow between piles, improve the shortcomings of poor water-stopping and easy soil flow of H-shaped steel, and further expand the adaptability of the support system in foundation pit support. In addition. H-shaped steel has large production volume, is easy to obtain, is cheap, is quick and efficient to construct, can be recycled, is green and environmentally friendly, and has low cost. It is especially suitable for foundation pits within a depth of 7m and in soil conditions with low permeability.

[0038] Preferably, in the above-mentioned water-stopping support system, the umbrella-type expansion mechanism 3 includes an upper end plate 31, a lower end plate 32, a plurality of main rods 33, a plurality of auxiliary rods 34, a high-strength flexible membrane 35, a plurality of tension springs 36 and a pile cap 37, the lower end plate 32 and the lower end plate 32 are both annular, the upper end plate 31 is fixedly sleeved on the outer wall of the steel advance diagonal brace 4, the lower end plate 32 is sleeved on the outer side of the steel advance diagonal brace 4, the pile cap 37 is fixedly set at the lower end of the steel advance diagonal brace 4, the lower end plate 32 is located between the upper end plate 31 and the pile cap 37, and the lower end plate 32 can move along the axial direction of the steel advance diagonal brace 4; the plurality of main rods 33 are radially arranged along the periphery of the upper end plate 31, and the upper ends of the main rods 33 are respectively connected to the upper end plate 31 and the lower end plate 32. The upper end plate 31 is hinged; one end of the auxiliary rod 34 is hinged to the middle part of the corresponding main rod 33, and the other end of the auxiliary rod 34 is hinged to the lower end plate 32, and the high-strength flexible membrane 35 covers the main rod 33; the plurality of tension springs 36 are evenly arranged on the lower end plate 32, and the two ends of the tension spring 36 are respectively connected to the lower end plate 32 and the pile cap 37. The plurality of tension springs 36 pull down the lower end plate 32 so that the main rod 33 is in a contracted state before the steel advance diagonal brace 4 is buried and in the initial stage of burial. When the steel advance diagonal brace 4 is driven into the soil to a certain depth, the soil resistance of the main rod 33 and the high-strength flexible membrane 35 combination exceeds the pulling force of the tension spring 36, and the main rod 33 is opened by the soil resistance, so that the umbrella-shaped expansion mechanism expands. The auxiliary rod 34 is mainly used to expand the angle of the main rod 33; the pile cap 37 is connected to the steel advance diagonal brace 4 by welding, and its main function is to reduce the gap between the main rod 33 and the outer wall of the steel advance diagonal brace 4 to avoid the main rod 33 from opening prematurely, and at the same time, it plays the role of fixing the tension spring 36.

[0039] Preferably, in the above-mentioned water-stopping support system, the high-strength flexible membrane 35 is any one of PTFE membrane (i.e., polytetrafluoroethylene membrane), geotextile, and polypropylene high-strength geotextile.

[0040] Preferably, in the above-mentioned water-stopping support system, the umbrella-shaped expansion mechanism 3 also includes a plurality of reinforcing ribs 38, one side of the reinforcing ribs 38 is respectively welded to the upper end plate 31, and the other side is respectively welded to the steel advance diagonal brace 4. The plurality of reinforcing ribs 38 are arranged at equal intervals along the outer circumference of the steel advance diagonal brace 4, which can play a role in enhancing the bearing capacity of the upper end plate 31.

[0041] Preferably, in the above-mentioned water-stopping support system, the pile cap 37 includes a disc portion and a cone portion, the upper surface of the disc portion is fixedly arranged at the lower end of the steel advance diagonal brace 4, the cone portion is fixedly arranged at the lower surface of the disc portion, the disc portion is coaxially fixedly connected with the cone portion and the steel advance diagonal brace 4 respectively, the cone tip of the cone portion is arranged away from the disc portion, the outer diameters of the upper end and the lower end are equal, the outer diameter of the disc portion is 3 to 5 cm larger than the outer diameters of the upper end and the lower end, and the pile cap 37 is connected to the steel advance diagonal brace 4 by welding. The above-mentioned structure and connection method are mainly used to reduce the gap between the main rod 33 and the outer wall of the steel advance diagonal brace 4, avoid the main rod 33 from opening prematurely, and at the same time, play the role of fixing the tension spring 36.

[0042] Preferably, in the above-mentioned water-stopping support system, the main rod 33 includes two lower structures, and the upper and lower structures are connected by bolts, and the high-strength flexible membrane 35 is clamped between adjacent main rods 33 by gluing, bundling or intermediate clamping.

[0043] Preferably, in the above-mentioned water-stop support system, the steel purlin 2 is supported by a plurality of brackets 5, and the plurality of brackets 5 are arranged at equal intervals along the longitudinal direction of the steel purlin 2. The brackets 5 include a horizontal support rod 51 and an oblique support rod 52. The horizontal support rod 51 is arranged horizontally and vertically connected to the steel purlin 2. The lower end of the oblique support rod 52 is fixedly connected to the steel purlin 2, and the upper end of the oblique support rod 52 is fixedly connected to the horizontal support rod 51. The connection between the oblique support rod 52 and the horizontal support rod 51 is arranged away from the steel purlin 2. The steel purlin 2 includes two H-shaped steels 21 and two connecting plates 22. The two H-shaped steels 21 are arranged in parallel up and down, the webs of the two H-shaped steels 21 are arranged horizontally, and the flanges of the two H-shaped steels 21 are arranged vertically. The flanges on the same side of the two H-shaped steels 21 are connected by corresponding connecting plates 22. The outer surfaces of the flanges on the same side of the two H-shaped steels 21 are fitted with the corresponding connecting plates 22. The upper side of the web of the upper H-shaped steel 21 and the lower side of the web of the lower H-shaped steel are respectively provided with a plurality of reinforcing plates 23 at equal intervals. The steel purlin 2 with the above structure not only makes the installation and connection of the steel purlin 2 itself very convenient, but also facilitates the rapid and efficient connection of the steel advanced diagonal brace 4 and the steel water-stopping retaining pile 1, realizes the rapid formation of a complete support system, and effectively improves the construction safety and efficiency.

[0044] Please continue reading Figures 1 to 10 This embodiment also discloses a water-stopping support method, which uses the water-stopping support system as described above, and the method comprises the following steps:

[0045] Step 1, constructing steel water-stopping retaining piles 1, wherein the steel water-stopping retaining piles 1 include first-type H-shaped steel piles and second-type H-shaped steel piles, wherein the first-type H-shaped steel piles and the second-type H-shaped steel piles are driven in alternately in sequence;

[0046] Step 2, driving the steel advance diagonal brace 4, and after the lower end of the steel advance diagonal brace 4 reaches a certain depth, the umbrella-shaped expansion mechanism expands to a predetermined state;

[0047] Step 3, installing the steel purlin 2, wherein the steel purlin 2 is arranged on the upper side of the steel water-stopping retaining pile 1;

[0048] Step 4, welding the upper end of the steel advanced diagonal brace 4 to the steel purlin 2 to form a high-bearing capacity water-stopping support system.

[0049] The present invention provides a water-stopping support method. By adopting a steel water-stopping retaining pile 1 composed of a first type H-steel pile 11 and a second type H-steel pile 12, the advantage of the greater rigidity of the H-steel is fully utilized. By extending the flange plates of the second type H-steel pile 12 facing the steel purlin to both sides, that is, extending the flanges of the second type H-steel pile, the flange plates of the adjacent first type H-steel piles 11 and the second type H-steel piles 12 facing the steel purlin 2 are connected by tongue and groove, which can effectively achieve water stopping and prevent soil flow between piles, improve the shortcomings of the existing H-steel piles with poor water stopping performance and easy soil flow, so that the adaptability of the support system in foundation pit support is further expanded; by adding an umbrella-type expansion mechanism 3. The umbrella-shaped expansion mechanism 3 is in a contracted state in a natural state. After the lower end of the steel advance diagonal brace 4 reaches a certain depth in the soil, the umbrella-shaped expansion mechanism 3 expands under the action of the soil resistance, thereby effectively improving the supporting force of the steel advance diagonal brace 4 in the shallow soil layer and shortening the pile length of the steel advance diagonal brace 4. The steel purlin 2, the steel water-stop retaining pile 1 and the steel advance diagonal brace 4 are adopted to realize the rapid connection of the steel water-stop retaining pile 1 and the steel advance diagonal brace 4, quickly realize the overall force of the support system, improve the construction safety and construction efficiency, and effectively solve the problems that the steel advance diagonal brace 4 cannot provide sufficient supporting force in the shallow soil layer and the cast-in-place reinforced concrete ring beam has a long construction period.

[0050] Preferably, in the above-mentioned water-stopping support method, the first type H-shaped steel pile 11 includes two first flange plates 111, a first web 112 and two first hook plates 113, the two ends of the first web 112 are respectively vertically connected to the middle of the two first flange plates 111, the two first hook plates 113 are symmetrically arranged on both sides of the first web 112, and the two first hook plates 113 are arranged close to the steel purlin 2. The second type H-shaped steel pile 12 includes two second flange plates 121, a second web plate 122 and two second hook plates 123, the two ends of the second web plate 122 are respectively vertically connected to the middle parts of the two second flange plates 121, the two ends of the second flange plate 121 close to the steel purlin 2 are respectively provided with the second hook plates 123, the first flange plate 111 away from the steel purlin 2 and the second flange plate 121 away from the steel purlin 2 are equal in width, the width of the second flange plate 121 close to the steel purlin 2 is greater than the width of the first flange plate 111 close to the steel purlin 2, the inner surface of the first flange plate 111 on the first type H-shaped steel pile 11 facing the steel purlin 2 and the second flange plate 111 on the second type H-shaped steel pile 11 facing the steel purlin 2 21 is fitted on the outer surface, the middle part of the second flange plate 121 on the second type H-shaped steel pile 11 facing the steel purlin 2 is thickened, and the width of the middle thickened part of the second flange plate 121 on the second type H-shaped steel pile 11 facing the steel purlin 2 is equal to the width of the second flange plate 121 on the second type H-shaped steel pile 11 away from the steel purlin 2, and the flange plates on the adjacent first type H-shaped steel piles 11 and second type H-shaped steel piles 12 facing the steel purlin 2 are connected by tongue and groove, which means that the first flange plate 111 on the first type H-shaped steel pile 11 facing the steel purlin 2 and the second flange plate 121 on the adjacent second type H-shaped steel pile 12 facing the steel purlin 2 are hooked and fitted to each other through the corresponding first hook plate 113 and second hook plate 123. As can be seen from the above. The steel water-stop retaining pile 1 adopts the first type H-shaped steel pile 11 and the second type H-shaped steel pile 12. The first type H-shaped steel pile 11 is formed by adding two first hook plates 113 to the existing H-shaped steel pile. The second type H-shaped steel pile 12 is extended with a flange plate relative to the existing H-shaped steel pile and is additionally provided with a second hook plate 123, which can give full play to the advantage of the greater rigidity of the H-shaped steel. Moreover, by extending the flange of the special H-shaped steel pile, the first flange plate 111 on the first type H-shaped steel pile 11 facing the steel purlin 2 and the second flange plate 121 on the adjacent second type H-shaped steel pile 12 facing the steel purlin 2 are hooked and connected to each other through the corresponding first hook plates 113 and second hook plates 123, which can effectively stop water and prevent soil flow between piles, improve the shortcomings of poor water-stopping and easy soil flow of H-shaped steel, and further expand the adaptability of the support system in foundation pit support. In addition. H-shaped steel has large production volume, is easy to obtain, is cheap, is quick and efficient to construct, can be recycled, is green and environmentally friendly, and has low cost. It is especially suitable for foundation pits within a depth of 7m and in soil conditions with low permeability.

[0051] Preferably, in the above-mentioned water-stopping support method, the umbrella-type expansion mechanism 3 includes an upper end plate 31, a lower end plate 32, a plurality of main rods 33, a plurality of auxiliary rods 34, a high-strength flexible membrane 35, a plurality of tension springs 36 and a pile cap 37, the lower end plate 32 and the lower end plate 32 are both annular, the upper end plate 31 is fixedly sleeved on the outer wall of the steel advance diagonal brace 4, the lower end plate 32 is sleeved on the outer side of the steel advance diagonal brace 4, the pile cap 37 is fixedly set at the lower end of the steel advance diagonal brace 4, the lower end plate 32 is located between the upper end plate 31 and the pile cap 37, and the lower end plate 32 can move along the axial direction of the steel advance diagonal brace 4; the plurality of main rods 33 are radially arranged along the periphery of the upper end plate 31, and the upper ends of the main rods 33 are respectively connected to the upper end plate 31 and the lower end plate 32. The upper end plate 31 is hinged; one end of the auxiliary rod 34 is hinged to the middle part of the corresponding main rod 33, and the other end of the auxiliary rod 34 is hinged to the lower end plate 32, and the high-strength flexible membrane 35 covers the main rod 33; the plurality of tension springs 36 are evenly arranged on the lower end plate 32, and the two ends of the tension spring 36 are respectively connected to the lower end plate 32 and the pile cap 37. The plurality of tension springs 36 pull down the lower end plate 32 so that the main rod 33 is in a contracted state before the steel advance diagonal brace 4 is buried and in the initial stage of burial. When the steel advance diagonal brace 4 is driven into the soil to a certain depth, the soil resistance of the main rod 33 and the high-strength flexible membrane 35 combination exceeds the pulling force of the tension spring 36, and the main rod 33 is opened by the soil resistance, so that the umbrella-shaped expansion mechanism 3 expands. The auxiliary rod 34 is mainly used to expand the angle of the main rod 33; the pile cap 37 is connected to the steel advance diagonal brace 4 by welding, and its main function is to reduce the gap between the main rod 33 and the outer wall of the steel advance diagonal brace 4 to avoid the main rod 33 from opening prematurely, and at the same time, it plays the role of fixing the tension spring 36.

[0052] Preferably, in the above-mentioned water-stopping support method, the umbrella-shaped expansion mechanism 3 also includes a plurality of reinforcing ribs 38, one side of the reinforcing ribs 38 is respectively welded to the upper end plate 31, and the other side is respectively welded to the steel advance diagonal brace 4. The plurality of reinforcing ribs 38 are arranged at equal intervals along the outer periphery of the steel advance diagonal brace 4, thereby enhancing the bearing capacity of the upper end plate 31.

[0053] Preferably, in the above-mentioned water-stopping support method, the pile cap 37 includes a disc portion and a cone portion, the upper surface of the disc portion is fixedly arranged on the lower end of the steel advance diagonal brace 4, and the cone portion is fixedly arranged on the lower surface of the disc portion, the disc portion is coaxially fixedly connected with the cone portion and the steel advance diagonal brace 4 respectively, the tip of the cone portion is arranged away from the disc portion, the outer diameter of the disc portion is 3 to 5 cm larger than the outer diameters of the upper end and the lower end, and the pile cap 37 is connected to the steel advance diagonal brace 4 by welding, and its main function is to reduce the gap between the main rod 33 and the outer wall of the steel advance diagonal brace 4 to avoid the main rod 33 from opening prematurely, and at the same time, it plays the role of fixing the tension spring 36.

[0054] Preferably, in the above-mentioned water-stopping support method, the main rod 33 includes two lower structures, and the upper and lower structures are connected by bolts, and the high-strength flexible membrane 35 is clamped between adjacent main rods 33 by gluing, bundling or intermediate clamping.

[0055] Preferably, in the above-mentioned water-stop support system, the steel purlin 2 is supported by a plurality of brackets 5, and the plurality of brackets 5 are arranged at equal intervals along the longitudinal direction of the steel purlin 2. The brackets 5 include a horizontal support rod 51 and an oblique support rod 52. The horizontal support rod 51 is arranged horizontally and vertically connected to the steel purlin 2. The lower end of the oblique support rod 52 is fixedly connected to the steel purlin 2, and the upper end of the oblique support rod 52 is fixedly connected to the horizontal support rod 51. The connection between the oblique support rod 52 and the horizontal support rod 51 is arranged away from the steel purlin 2. The steel purlin 2 includes two H-shaped steels 21 and two connecting plates 22. The two H-shaped steels 21 are arranged in parallel up and down, the webs of the two H-shaped steels 21 are arranged horizontally, and the flanges of the two H-shaped steels 21 are arranged vertically. The flanges on the same side of the two H-shaped steels 21 are connected by corresponding connecting plates 22. The outer surfaces of the flanges on the same side of the two H-shaped steels 21 are fitted with the corresponding connecting plates 22. The upper side of the web of the upper H-shaped steel 21 and the lower side of the web of the lower H-shaped steel are respectively provided with a plurality of reinforcing plates 23 at equal intervals. The steel purlin 2 with the above structure not only makes the installation and connection of the steel purlin 2 itself very convenient, but also facilitates the rapid and efficient connection of the steel advanced diagonal brace 4 and the steel water-stopping retaining pile 1, realizes the rapid formation of a complete support system, and effectively improves the construction safety and efficiency.

[0056] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A water-stopping support system, characterized in that: The invention comprises a steel water-stopping retaining pile, a steel purlin, an umbrella-shaped expansion mechanism and a steel advanced diagonal brace. The steel water-stopping retaining pile comprises a first type H-shaped steel pile and a second type H-shaped steel pile. The first type H-shaped steel pile and the second type H-shaped steel pile are driven in turn alternately. The steel purlin is arranged on the upper side of the steel water-stopping retaining pile. The flange plate of the second type H-shaped steel pile facing the steel purlin is extended to both sides. The adjacent first type H-shaped steel pile and the second type H-shaped steel pile are connected to the steel purlin. The flange plate of the upper steel purlin is connected through a tongue and groove connection, and an umbrella-shaped expansion mechanism is arranged at the lower end of the steel advance diagonal brace. The umbrella-shaped expansion mechanism is in a contracted state in a natural state. After the lower end of the steel advance diagonal brace reaches a certain depth of the soil, the umbrella-shaped expansion mechanism expands under the action of the soil resistance, and the upper end of the steel advance diagonal brace is connected to the steel purlin. There are multiple steel advance diagonal braces, and the multiple steel advance diagonal braces are arranged at equal intervals along the longitudinal direction of the steel purlin.

2. The water-stopping support system according to claim 1, characterized in that: The first type of H-shaped steel pile comprises two first flange plates, a first web plate and two first hook plates, the two ends of the first web plate are respectively vertically connected to the middle of the two first flange plates, the two first hook plates are symmetrically arranged on both sides of the first web plate, and the two first hook plates are arranged close to the section steel purlin; the second type of H-shaped steel pile comprises two second flange plates, a second web plate and two second hook plates, the two ends of the second web plate are respectively vertically connected to the middle of the two second flange plates, the two ends of the second flange plate close to the section steel purlin are respectively arranged with the second hook plates, the first flange plate far from the section steel purlin and the second flange plate far from the section steel purlin are equal in width, the width of the second flange plate close to the section steel purlin is greater than the width of the first flange plate close to the section steel purlin, The inner surface of the first flange plate of the first type H-shaped steel pile facing the steel purlin is fitted with the outer surface of the second flange plate of the second type H-shaped steel pile facing the steel purlin, the middle part of the second flange plate of the second type H-shaped steel pile facing the steel purlin is thickened, and the width of the middle thickened part of the second flange plate of the second type H-shaped steel pile facing the steel purlin is equal to the width of the second flange plate on the second type H-shaped steel pile away from the steel purlin. The flange plates of adjacent first type H-shaped steel piles and second type H-shaped steel piles facing the steel purlin are connected by tongue and groove, which means that the first flange plate of the first type H-shaped steel pile facing the steel purlin and the second flange plate of the adjacent second type H-shaped steel pile facing the steel purlin are hooked with each other and fitted with each other through the corresponding first hook plate and second hook plate.

3. The water-stopping support system according to claim 1, characterized in that: The umbrella-shaped expansion mechanism includes an upper end plate, a lower end plate, a plurality of main rods, a plurality of auxiliary rods, a high-strength flexible membrane, a plurality of tension springs and a pile cap, the lower end plate and the lower end plate are both in annular shape, the upper end plate is fixedly sleeved on the outer wall of the steel advance diagonal brace, the lower end plate is sleeved on the outer side of the steel advance diagonal brace, the pile cap is fixedly arranged at the lower end of the steel advance diagonal brace, the lower end plate is located between the upper end plate and the pile cap, and the lower end plate can move along the axial direction of the steel advance diagonal brace; the plurality of main rods are radially arranged along the periphery of the upper end plate, and the upper ends of the main rods are respectively hinged to the upper end plates; the auxiliary rods are One end of the rod is hinged to the middle part of the corresponding main rod, and the other end of the auxiliary rod is hinged to the lower end plate, and the high-strength flexible membrane covers the main rod; the plurality of tension springs are evenly arranged on the lower end plate, and the two ends of the tension spring are respectively connected to the lower end plate and the pile cap, and the plurality of tension springs pull down the lower end plate so that the main rod is in a contracted state before the steel advance diagonal brace is buried and in the initial stage of burial. When the steel advance diagonal brace is driven into the soil to a certain depth, the soil resistance of the main rod and the high-strength flexible membrane assembly exceeds the tension of the tension spring, and the main rod is opened by the soil resistance, so that the umbrella-shaped expansion mechanism expands.

4. The water-stopping support system according to claim 3, characterized in that: The pile cap includes a disc portion and a cone portion, the upper surface of the disc portion is fixedly arranged on the lower end of the steel advance diagonal brace, and the cone portion is fixedly arranged on the lower surface of the disc portion, the disc portion is coaxially fixedly connected to the cone portion and the steel advance diagonal brace respectively, the cone tip of the cone portion is arranged away from the disc portion, and the outer diameter of the disc portion is 3 to 5 cm larger than the outer diameters of the upper end and the lower end.

5. The water-stopping support system according to claim 1, characterized in that: The steel purlin is supported by a plurality of brackets, and the plurality of brackets are arranged at equal intervals along the longitudinal direction of the steel purlin, and the bracket comprises a horizontal support rod and an oblique support rod, the horizontal support rod is arranged horizontally and vertically connected to the steel purlin, the lower end of the oblique support rod is fixedly connected to the steel purlin, the upper end of the oblique support rod is fixedly connected to the horizontal support rod, and the connection between the oblique support rod and the horizontal support rod is arranged away from the steel purlin, and the steel purlin comprises two H-shaped steels and two connecting plates, the two H-shaped steels are arranged parallel to each other up and down, the webs of the two H-shaped steels are arranged horizontally, and the flange plates of the two H-shaped steels are arranged vertically, the flange plates on the same side of the two H-shaped steels are connected by corresponding connecting plates, the outer surfaces of the flange plates on the same side of the two H-shaped steels are fitted with the corresponding connecting plates, and the upper side of the web of the upper H-shaped steel and the lower side of the web of the lower H-shaped steel are respectively provided with a plurality of reinforcing plates at equal intervals.

6. A water-stopping support method, characterized in that: Using the water-stopping support system as claimed in claim 1, the method comprises the following steps: Step 1, constructing steel water-stopping retaining piles, wherein the steel water-stopping retaining piles include first-type H-shaped steel piles and second-type H-shaped steel piles, and the first-type H-shaped steel piles and the second-type H-shaped steel piles are driven in alternately in sequence; Step 2, driving in a steel advance diagonal brace, and after the lower end of the steel advance diagonal brace reaches a certain depth, the umbrella-shaped expansion mechanism expands to a predetermined state; Step 3, installing a steel purlin, wherein the steel purlin is arranged on the upper side of the steel water-stopping retaining pile; Step 4: weld the upper end of the steel advance diagonal brace to the steel purlin to form a high-bearing capacity water-stop support system.

7. The water-stopping support method according to claim 6, characterized in that: The first type of H-shaped steel pile comprises two first flange plates, a first web plate and two first hook plates. The first type of H-shaped steel pile comprises two first flange plates, a first web plate and two first hook plates. The two ends of the first web plate are respectively vertically connected to the middle of the two first flange plates. The two first hook plates are symmetrically arranged on both sides of the first web plate. The two first hook plates are arranged close to the steel purlin. The second type of H-shaped steel pile comprises two second flange plates, a second web plate and two second hook plates. The two ends of the second web plate are respectively vertically connected to the middle of the two second flange plates. The second hook plates are respectively arranged at the two ends of the second flange plate close to the steel purlin. The widths of the first flange plate far from the steel purlin and the second flange plate far from the steel purlin are equal. The width of the second flange plate close to the steel purlin is greater than The width of the first flange plate close to the steel purlin, the inner surface of the first flange plate on the first type H-steel pile facing the steel purlin and the outer surface of the second flange plate on the second type H-steel pile facing the steel purlin are fitted together, the middle part of the second flange plate on the second type H-steel pile facing the steel purlin is thickened, the width of the middle thickened part of the second flange plate on the second type H-steel pile facing the steel purlin is equal to the width of the second flange plate on the second type H-steel pile away from the steel purlin, and the flange plates on the adjacent first type H-steel piles and the second type H-steel piles facing the steel purlin are connected through tongue and groove, which means that the first flange plate on the first type H-steel pile facing the steel purlin and the second flange plate on the adjacent second type H-steel pile facing the steel purlin are hooked with each other through the corresponding first hook plate and second hook plate and fitted together.

8. The water-stopping support method according to claim 6, characterized in that: The umbrella-shaped expansion mechanism includes an upper end plate, a lower end plate, a plurality of main rods, a plurality of auxiliary rods, a high-strength flexible membrane, a plurality of tension springs and a pile cap, the lower end plate and the lower end plate are both in annular shape, the upper end plate is fixedly sleeved on the outer wall of the steel advance diagonal brace, the lower end plate is sleeved on the outer side of the steel advance diagonal brace, the pile cap is fixedly arranged at the lower end of the steel advance diagonal brace, the lower end plate is located between the upper end plate and the pile cap, and the lower end plate can move along the axial direction of the steel advance diagonal brace; the plurality of main rods are radially arranged along the periphery of the upper end plate, and the upper ends of the main rods are respectively hinged to the upper end plates; the auxiliary rods are One end of the rod is hinged to the middle part of the corresponding main rod, and the other end of the auxiliary rod is hinged to the lower end plate, and the high-strength flexible membrane covers the main rod; the plurality of tension springs are evenly arranged on the lower end plate, and the two ends of the tension spring are respectively connected to the lower end plate and the pile cap, and the plurality of tension springs pull down the lower end plate so that the main rod is in a contracted state before the steel advance diagonal brace is buried and in the initial stage of burial. When the steel advance diagonal brace is driven into the soil to a certain depth, the soil resistance of the main rod and the high-strength flexible membrane assembly exceeds the tension of the tension spring, and the main rod is opened by the soil resistance, so that the umbrella-shaped expansion mechanism expands.

9. The water-stopping support method according to claim 8, characterized in that: The pile cap includes a disc portion and a cone portion, the upper surface of the disc portion is fixedly arranged on the lower end of the steel advance diagonal brace, and the cone portion is fixedly arranged on the lower surface of the disc portion, the disc portion is coaxially fixedly connected to the cone portion and the steel advance diagonal brace respectively, the cone tip of the cone portion is arranged away from the disc portion, and the outer diameter of the disc portion is 3 to 5 cm larger than the outer diameters of the upper end and the lower end.

10. The water-stopping support method according to claim 6, characterized in that: The steel purlin is supported by a plurality of brackets, and the plurality of brackets are arranged at equal intervals along the longitudinal direction of the steel purlin, and the bracket comprises a horizontal support rod and an oblique support rod, the horizontal support rod is arranged horizontally and vertically connected to the steel purlin, the lower end of the oblique support rod is fixedly connected to the steel purlin, the upper end of the oblique support rod is fixedly connected to the horizontal support rod, and the connection between the oblique support rod and the horizontal support rod is arranged away from the steel purlin, and the steel purlin comprises two H-shaped steels and two connecting plates, the two H-shaped steels are arranged parallel to each other up and down, the webs of the two H-shaped steels are arranged horizontally, and the flange plates of the two H-shaped steels are arranged vertically, the flange plates on the same side of the two H-shaped steels are connected by corresponding connecting plates, the outer surfaces of the flange plates on the same side of the two H-shaped steels are fitted with the corresponding connecting plates, and the upper side of the web of the upper H-shaped steel and the lower side of the web of the lower H-shaped steel are respectively provided with a plurality of reinforcing plates at equal intervals.

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