All-steel type combined inclined strut supporting system and method

Abstract

The invention provides an all-steel type combined inclined strut supporting system and method.The all-steel type combined inclined strut supporting system comprises steel fender posts, hoop type steel combined ring beams, umbrella-shaped expansion mechanisms and steel advanced inclined struts, the steel fender posts are formed by combining a plurality of steel pipe piles and water stop steel sheet piles, the steel pipe piles are sleeved with the hoop type steel combined ring beams, and the water stop steel sheet piles are arranged on the umbrella-shaped expansion mechanisms; the adjacent steel combined ring beams are connected into a whole, the umbrella-shaped expansion mechanisms are arranged at the lower ends of the steel advance inclined struts, the umbrella-shaped expansion mechanisms are in a contraction state in a natural state, and 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. The upper ends of the steel advance inclined struts are connected with the corresponding hoop type steel combined ring beams, by additionally arranging the umbrella-shaped expansion mechanisms, the supporting force of the steel advance inclined struts in a shallow soil layer can be improved, the pile length of the steel advance inclined struts can be shortened, the enclosure body and the steel advance inclined struts can be rapidly connected through the hoop type steel combined ring beams, and the construction efficiency is improved. The overall stress of the supporting system is realized.

Description

Technical Field

[0001] The invention belongs to the field of underground engineering, and particularly relates to an all-steel combined diagonal bracing support system and method. Background Art

[0002] For foundation pits with shallow excavation depth (h≤7m), when the foundation pit area 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 pit edge, the need for secondary pouring of the bottom plate, and the risk of water leakage after cutting the bottom plate of the main building.

[0003] In response to the above shortcomings, a self-stabilizing foundation pit support structure system using steel advance diagonal bracing piles instead of diagonal braces 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 brace, the steel advance diagonal brace 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 steel advance diagonal braces generally use small-diameter steel pipe piles combined with post-grouting to form a combined steel pipe pile reinforcement body, or directly use 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 steel advance diagonal brace are weak, and it cannot provide sufficient support in the shallow soil layer. Therefore, the steel advance diagonal brace 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 steel advance 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, which ultimately produces a lot of waste concrete, which is not environmentally friendly. Summary of the invention

[0004] In view of the problems that steel advance diagonal braces cannot provide sufficient supporting force in shallow soil layers and the construction period of cast-in-place reinforced concrete ring beams is long, the present invention proposes a high-bearing capacity all-steel composite steel advance diagonal brace support system that can be quickly constructed. The system can improve the supporting force of steel advance diagonal braces in shallow soil layers, shorten the length of steel advance diagonal brace piles, and adopt a sleeve-type steel composite ring beam to quickly achieve the connection between the enclosure and the steel advance diagonal brace, thereby realizing the overall force of the support system.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A full-steel composite diagonal bracing support system comprises steel retaining piles, a sleeve-type steel composite ring beam, an umbrella-type expansion mechanism and a steel advance diagonal brace. The steel retaining piles are composed of a plurality of steel pipe piles and water-stop steel sheet piles. The steel pipe piles and the water-stop steel sheet piles are driven in alternately in sequence. Adjacent steel pipe piles are connected by the water-stop steel sheet piles to play a water-stopping role. The top of the steel pipe pile is higher than the top surface of the sleeve-type steel composite ring beam. The top of the water-stop steel sheet pile is flush with the bottom surface of the sleeve-type steel composite ring beam. Each sleeve-type steel composite ring beam is sleeved on each steel pipe pile. Adjacent steel composite ring beams are connected as a whole. The umbrella-type expansion mechanism is arranged at the lower end of the steel advance diagonal brace. The umbrella-type 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-type expansion mechanism expands under the action of soil resistance. The upper end of the steel advance diagonal brace is connected to the corresponding sleeve-type steel composite ring beam.

[0006] Preferably, in the above-mentioned all-steel combined diagonal brace 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 annular, 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 with the upper end plate; one end of the auxiliary rod is hinged with the middle part of the corresponding main rod, and the other end of the auxiliary rod is hinged with 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.

[0007] The working principle of the umbrella-shaped expansion mechanism is as follows: by evenly distributing tension springs on the lower end plate, the spring tension acts as a locking mechanism before the steel advance diagonal brace is buried in the soil and in the initial stage of burial, so that the main rod and the high-strength flexible membrane are in a contracted state; when the soil resistance exerted on the main rod and the high-strength flexible membrane combination exceeds the tension of the tension spring, the main rod is braced open by the soil resistance, and the angle becomes larger and larger until it reaches a predetermined state, thereby achieving the purpose of improving the bearing capacity of the steel advance diagonal brace.

[0008] Preferably, in the above-mentioned all-steel combined diagonal bracing support system, the umbrella-shaped expansion mechanism also includes a plurality of reinforcing ribs, one side of the reinforcing ribs are respectively welded to the upper end plates, and the other side are respectively welded to the steel advance diagonal braces. The plurality of reinforcing ribs are arranged at equal intervals along the outer circumference of the steel advance diagonal braces, thereby enhancing the bearing capacity of the upper end plates.

[0009] Preferably, in the above-mentioned all-steel combined diagonal brace 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 with the cone portion and the steel advance diagonal brace respectively, the cone 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 and the steel advance diagonal brace are connected by welding, the main function of which is to reduce the gap between the main rod and the outer wall of the steel advance diagonal brace to avoid the main rod from opening prematurely, and at the same time, it plays the role of fixing the tension spring.

[0010] Preferably, in the above-mentioned all-steel composite diagonal bracing support system, the top end of the steel pipe pile is higher than the top surface of the sleeve-type steel composite ring beam, and the top end of the water-stop steel sheet pile is flush with the bottom surface of the sleeve-type steel composite ring beam.

[0011] Preferably, in the above-mentioned all-steel composite diagonal bracing support system, the sleeve-type steel composite ring beam adopts a sleeve-type box-type structure, the sleeve-type steel composite ring beam is arranged along the edge of the foundation pit, and the adjacent sleeve-type steel composite ring beams are connected into a whole by high-strength bolts. The sleeve-type steel composite ring beam includes an outer shell, an inner shell and a plurality of connecting parts. The outer shell is a box-type structure welded by four rectangular steel plates, and the inner shell is a circular tube that can be inserted into the steel pipe pile. The inner diameter of the inner shell is slightly larger than the outer diameter of the steel pipe pile. The inner shell and the outer shell are welded and connected as a whole by a plurality of connecting parts. The plurality of connecting parts are radially and evenly arranged on the outer circumferential surface of the inner shell, and the connecting parts are steel plates. The sleeve-type steel composite ring beam adopting the above-mentioned structure not only makes the installation and connection of the sleeve-type steel composite ring beam itself very convenient, but also facilitates the rapid and efficient connection of the steel advance diagonal brace and the steel retaining pile, realizes the rapid formation of a complete support system, and effectively improves the construction safety and construction efficiency.

[0012] An all-steel combined diagonal bracing support method, using the all-steel combined diagonal bracing support system as described above, the method comprises the following steps: Step 1, constructing steel retaining piles, wherein the steel retaining piles include steel pipe piles and water-stopping steel sheets, and the steel pipe piles and water-stopping steel sheet piles are driven in alternately; 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, sleeve the sleeve-type steel composite ring beam on the top of the corresponding steel pipe pile, the top of the steel pipe pile is higher than the top surface of the sleeve-type steel composite ring beam, the top of the water-stop steel sheet pile is flush with the bottom surface of the sleeve-type steel composite ring beam, and the adjacent sleeve-type steel composite ring beams are connected into a whole with high-strength bolts; Step 4, welding the upper end of the steel advance diagonal brace to the sleeve-type steel composite ring beam to form a complete support system, thereby achieving the purpose of rapidly increasing the support force.

[0013] Preferably, in the above-mentioned all-steel combined diagonal brace support method, 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 annular, 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 with the upper end plate; one end of the auxiliary rod is hinged with the middle part of the corresponding main rod, and the other end of the auxiliary rod is hinged with 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.

[0014] Preferably, in the above-mentioned all-steel combined diagonal brace support method, the umbrella-shaped expansion mechanism also includes a plurality of reinforcing ribs, one side of the reinforcing ribs are respectively welded to the upper end plates, and the other side are respectively welded to the steel advance diagonal braces, and the plurality of reinforcing ribs are arranged at equal intervals along the outer circumference of the steel advance diagonal brace, thereby enhancing the bearing capacity of the upper end plates.

[0015] Preferably, in the above-mentioned all-steel combined diagonal brace support method, 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 with the cone portion and the steel advance diagonal brace respectively, the cone 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 and the steel advance diagonal brace are connected by welding, the main function of which is to reduce the gap between the main rod and the outer wall of the steel advance diagonal brace to avoid the main rod from opening prematurely, and at the same time, it plays the role of fixing the tension spring.

[0016] Preferably, in the above-mentioned all-steel composite diagonal bracing support method, the top end of the steel pipe pile is higher than the top surface of the sleeve-type steel composite ring beam, and the top end of the water-stop steel sheet pile is flush with the bottom surface of the sleeve-type steel composite ring beam.

[0017] Preferably, in the above-mentioned all-steel composite diagonal bracing support method, the sleeve-type steel composite ring beam adopts a sleeve-type box-type structure, the sleeve-type steel composite ring beam is arranged along the edge of the foundation pit, and the adjacent sleeve-type steel composite ring beams are connected into a whole by high-strength bolts. The sleeve-type steel composite ring beam includes an outer shell, an inner shell and a plurality of connecting parts. The outer shell is a box-type structure welded by four rectangular steel plates, and the inner shell is a circular tube that can be inserted into the steel pipe pile. The inner diameter of the inner shell is slightly larger than the outer diameter of the steel pipe pile. The inner shell and the outer shell are welded and connected as a whole by a plurality of connecting parts. The plurality of connecting parts are radially and evenly arranged on the outer peripheral surface of the inner shell, and the connecting parts are steel plates. The sleeve-type steel composite ring beam adopting the above-mentioned structure not only makes the installation and connection of the sleeve-type steel composite ring beam itself very convenient, but also facilitates the rapid and efficient connection of the steel advance diagonal brace and the steel retaining pile, realizes the rapid formation of a complete support system, and effectively improves the construction safety and construction efficiency.

[0018] 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: In summary, the present invention provides an all-steel composite diagonal bracing support system and method, which adopts steel retaining piles, sleeve-type steel composite ring beams, umbrella-shaped expansion mechanisms and steel advanced diagonal braces. The steel retaining piles are composed of a plurality of steel pipe piles and water-stop steel sheet piles. The steel pipe piles and the water-stop steel sheet piles are driven in alternately in sequence. The top of the steel pipe pile is higher than the top surface of the sleeve-type steel composite ring beam, and the top of the water-stop steel sheet pile is flush with the bottom surface of the sleeve-type steel composite ring beam. Each sleeve-type steel composite ring beam is sleeved on each steel pipe pile, and adjacent steel composite ring beams are connected as a whole. 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 under 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. The upper end of the steel advance diagonal brace is connected with the corresponding sleeve-type steel composite ring beam. By adding the umbrella-shaped expansion mechanism, the supporting force of the steel advance diagonal brace in the shallow soil layer can be improved, and the pile length of the steel advance diagonal brace can be shortened. By adopting the sleeve-type steel composite ring beam, the connection between the enclosure and the steel advance diagonal brace can be quickly realized, and the overall force of the support system can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the facade structure of an all-steel combined diagonal bracing support system.

[0020] Figure 2It is a planar structural diagram of an all-steel combined diagonal bracing support system.

[0021] Figure 3 It is a structural schematic diagram of the umbrella-shaped expansion mechanism in the retracted state.

[0022] Figure 4 This is a schematic diagram of the structure of the umbrella-shaped expansion mechanism in its expanded state. Figure 5 yes Figure 4 Top view of the .

[0023] In the figure: 1-steel retaining piles, 11-steel pipe piles, 12-waterstop steel sheet piles, 2-hoop-type steel composite ring beam, 21-outer shell, 22-inner shell, 23-connecting parts, 24-high-strength bolts, 3-umbrella-type 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-reinforced ribs, 4-steel advanced diagonal braces. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figures 1 to 5 The present embodiment discloses an all-steel composite diagonal bracing support system, comprising a steel retaining pile 1, a sleeve-type steel composite ring beam 2, an umbrella-shaped expansion mechanism 3, and a steel advanced diagonal brace 4. The steel retaining pile 1 is composed of a plurality of steel pipe piles 11 and water-stop steel sheet piles 12. The steel pipe piles 11 and the water-stop steel sheet piles 12 are driven in turn. The top of the steel pipe pile 11 is higher than the top surface of the sleeve-type steel composite ring beam 2. The top of the water-stop steel sheet pile 12 is aligned with the sleeve-type steel composite ring beam 2. The bottom surface of the combined ring beam 2 is flush, each sleeve-type steel composite ring beam 2 is sleeved on each steel pipe pile 11, and adjacent steel composite ring beams are connected into a whole. 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 under 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 3 expands under the action of the soil resistance, and the upper end of the steel advance diagonal brace 4 is connected to the corresponding sleeve-type steel composite ring beam 2.

[0026] The present invention provides an all-steel composite diagonal brace support system and method. By adding an umbrella-shaped 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 of 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 sleeve-shaped steel composite ring beam 2, the steel retaining pile 1 and the steel advance diagonal brace 4 are adopted to achieve a quick connection between the steel retaining pile 1 and the steel advance diagonal brace 4, quickly realize the overall force of the support system, improve 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.

[0027] Preferably, in the above-mentioned all-steel combined diagonal brace 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 arranged 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 divided into The auxiliary rod 34 is respectively hinged to the middle part of the corresponding main rod 33, and the other end of the auxiliary rod 34 is respectively 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, and 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.

[0028] Preferably, in the above-mentioned all-steel combined diagonal bracing support system, the high-strength flexible membrane 35 adopts any one of PTFE membrane (i.e., polytetrafluoroethylene membrane), geotextile, and polypropylene high-strength geotextile.

[0029] Preferably, in the above-mentioned all-steel combined diagonal bracing 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.

[0030] Preferably, in the above-mentioned all-steel combined diagonal brace 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.

[0031] Preferably, in the above-mentioned all-steel combined diagonal bracing 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 in the form of gluing, bundling or intermediate clamping.

[0032] Preferably, in the above-mentioned all-steel composite diagonal bracing support system, the sleeve-type steel composite ring beam 2 adopts a sleeve-type box-type structure, the sleeve-type steel composite ring beam 2 is arranged along the edge of the foundation pit, and adjacent sleeve-type steel composite ring beams 2 are connected into a whole by high-strength bolts 24. The sleeve-type steel composite ring beam 2 includes an outer shell 21, an inner shell 22 and a plurality of connecting parts 23. The outer shell 21 is a box-type structure welded by four rectangular steel plates, and the inner shell 22 is a circular tube into which the steel pipe piles 11 can be inserted. The inner diameter of the inner shell 22 is slightly larger than the outer diameter of the steel pipe piles 11. The inner shell 22 and the outer shell 21 are welded and connected as a whole by a plurality of connecting parts 23. The plurality of connecting parts 23 are radially and evenly arranged on the outer peripheral surface of the inner shell 22, and the connecting parts 23 are made of steel plates. The sleeve-type steel composite ring beam 2 using the above-mentioned structure not only makes the installation and connection of the sleeve-type steel composite ring beam 2 itself very convenient, but also facilitates the rapid and efficient connection of the steel advance diagonal brace 4 and the steel retaining pile 1, thereby realizing the rapid formation of a complete support system and effectively improving construction safety and efficiency.

[0033] Please continue reading Figures 1 to 5The present invention also discloses a full-steel combined diagonal bracing support method, which adopts the full-steel combined diagonal bracing support system as described above, and the method comprises the following steps: Step 1, constructing steel retaining piles 1, wherein the steel retaining piles 1 include steel pipe piles 11 and water-stopping steel sheets, wherein the steel pipe piles 11 and water-stopping steel sheet piles 12 are alternately driven in; 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 3 expands to a predetermined state; Step 3, sleeve the sleeve-type steel composite ring beam 2 on the top of the corresponding steel pipe pile 11, the top of the steel pipe pile 11 is higher than the top surface of the sleeve-type steel composite ring beam 2, the top of the water-stop steel sheet pile 12 is flush with the bottom surface of the sleeve-type steel composite ring beam 2, and the adjacent sleeve-type steel composite ring beams 2 are connected into a whole with high-strength bolts 24; Step 4, welding the upper end of the steel advanced diagonal brace 4 to the sleeve-type steel composite ring beam 2 to form a complete support system, thereby achieving the purpose of rapidly increasing the support force.

[0034] The present invention provides an all-steel combined diagonal brace support method, which adds an umbrella-shaped 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 of 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; by adopting the sleeve-type steel composite ring beam 2, the steel retaining pile 1 and the steel advance diagonal brace 4, the steel retaining pile 1 and the steel advance diagonal brace 4 can be quickly connected, the overall force of the support system can be quickly realized, the construction safety and construction efficiency are improved, and the problems of the steel advance diagonal brace 4 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 are effectively solved.

[0035] Preferably, in the above-mentioned all-steel combined diagonal brace 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 divided into The auxiliary rod 34 is respectively hinged to the middle part of the corresponding main rod 33, and the other end of the auxiliary rod 34 is respectively 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, and 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.

[0036] Preferably, in the above-mentioned all-steel combined diagonal brace 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, and the plurality of reinforcing ribs 38 are arranged at equal intervals along the outer periphery of the steel advance diagonal brace 4, so as to enhance the bearing capacity of the upper end plate 31.

[0037] Preferably, in the above-mentioned all-steel combined diagonal brace 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 cone tip of the cone portion is arranged away from the disc portion, the outer diameter of the disc portion is 3~5cm larger than the outer diameter 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.

[0038] Preferably, in the above-mentioned all-steel combined diagonal bracing 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 in the form of gluing, bundling or intermediate clamping.

[0039] Preferably, in the above-mentioned all-steel composite diagonal bracing support method, the sleeve-type steel composite ring beam 2 adopts a sleeve-type box-type structure, the sleeve-type steel composite ring beam 2 is arranged along the edge of the foundation pit, and adjacent sleeve-type steel composite ring beams 2 are connected into a whole by high-strength bolts 24. The sleeve-type steel composite ring beam 2 includes an outer shell 21, an inner shell 22 and a plurality of connecting parts 23. The outer shell 21 is a box-type structure welded by four rectangular steel plates, and the inner shell 22 is a circular tube into which the steel pipe piles 11 can be inserted. The inner diameter of the inner shell 22 is slightly larger than the outer diameter of the steel pipe piles 11. The inner shell 22 and the outer shell 21 are welded and connected as a whole by a plurality of connecting parts 23. The plurality of connecting parts 23 are radially and evenly arranged on the outer peripheral surface of the inner shell 22, and the connecting parts 23 are made of steel plates. The sleeve-type steel composite ring beam 2 using the above-mentioned structure not only makes the installation and connection of the sleeve-type steel composite ring beam 2 itself very convenient, but also facilitates the rapid and efficient connection of the steel advance diagonal brace 4 and the steel retaining pile 1, thereby realizing the rapid formation of a complete support system and effectively improving construction safety and efficiency.

[0040] 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. An all-steel combined diagonal bracing support system, characterized in that: It includes steel retaining piles, a sleeve-type steel composite ring beam, an umbrella-shaped expansion mechanism and a steel advance diagonal brace. The steel retaining piles are composed of a plurality of steel pipe piles and water-stop steel sheet piles. The steel pipe piles and the water-stop steel sheet piles are driven in alternately in sequence. The top of the steel pipe pile is higher than the top surface of the sleeve-type steel composite ring beam, and the top of the water-stop steel sheet pile is flush with the bottom surface of the sleeve-type steel composite ring beam. Each sleeve-type steel composite ring beam is sleeved on each steel pipe pile, and adjacent steel composite ring beams are connected into a whole. 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 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 corresponding sleeve-type steel composite ring beam.

2. The all-steel combined diagonal bracing support system according to claim 1 is 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.

3. The all-steel combined diagonal bracing support system according to claim 1 is characterized in that: The umbrella-shaped expansion mechanism also includes a plurality of reinforcing ribs, one side of which is welded to the upper end plate, and the other side is welded to the steel advance diagonal brace. The plurality of reinforcing ribs are arranged at equal intervals along the outer circumference of the steel advance diagonal brace.

4. The all-steel combined diagonal bracing system according to claim 2, 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 all-steel combined diagonal bracing support system according to claim 1, characterized in that: The hoop-type steel composite ring beam adopts a hoop-type box-type structure. The hoop-type steel composite ring beam is arranged along the edge of the foundation pit. Adjacent hoop-type steel composite ring beams are connected into a whole by high-strength bolts. The hoop-type steel composite ring beam includes an outer shell, an inner shell and a plurality of connecting parts. The outer shell is a box-type structure welded by four rectangular steel plates. The inner shell is a circular tube that can allow steel pipe piles to extend into. The inner shell and the outer shell are welded and connected as a whole by a plurality of connecting parts. The plurality of connecting parts are radially and evenly arranged on the outer circumferential surface of the inner shell. The connecting parts are made of steel plates.

6. An all-steel combined diagonal bracing support method, characterized in that: Using the all-steel combined diagonal bracing system as claimed in claim 1, the method comprises the following steps: Step 1, constructing steel retaining piles, wherein the steel retaining piles include steel pipe piles and water-stopping steel sheets, and the steel pipe piles and water-stopping steel sheet piles are driven in alternately; 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, sleeve the sleeve-type steel composite ring beam on the top of the corresponding steel pipe pile, the top of the steel pipe pile is higher than the top surface of the sleeve-type steel composite ring beam, the top of the water-stop steel sheet pile is flush with the bottom surface of the sleeve-type steel composite ring beam, and the adjacent sleeve-type steel composite ring beams are connected into a whole with high-strength bolts; Step 4, welding the upper end of the steel advance diagonal brace to the sleeve-type steel composite ring beam to form a complete support system, thereby achieving the purpose of rapidly increasing the support force.

7. The all-steel combined diagonal bracing 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.

8. The all-steel combined diagonal bracing support method according to claim 6, characterized in that: The umbrella-shaped expansion mechanism also includes a plurality of reinforcing ribs, one side of which is welded to the upper end plate, and the other side is welded to the steel advance diagonal brace. The plurality of reinforcing ribs are arranged at equal intervals along the outer circumference of the steel advance diagonal brace.

9. The all-steel combined diagonal bracing support method according to claim 7, 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 all-steel combined diagonal bracing support method according to claim 6, characterized in that: The hoop-type steel composite ring beam adopts a hoop-type box-type structure. The hoop-type steel composite ring beam is arranged along the edge of the foundation pit. Adjacent hoop-type steel composite ring beams are connected into a whole by high-strength bolts. The hoop-type steel composite ring beam includes an outer shell, an inner shell and a plurality of connecting parts. The outer shell is a box-type structure welded by four rectangular steel plates. The inner shell is a circular tube that can allow steel pipe piles to extend into. The inner shell and the outer shell are welded and connected as a whole by a plurality of connecting parts. The plurality of connecting parts are radially and evenly arranged on the outer circumferential surface of the inner shell. The connecting parts are made of steel plates.

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