Steel pipe-truss combined type recoverable pipe roof supporting system and construction method thereof

Abstract

The invention provides a steel pipe-truss combined type recoverable pipe-roofing supporting system and a construction method thereof, and belongs to the technical field of pipe-roofing supporting. The steel pipe-truss combined type recoverable pipe-roofing supporting system comprises steel pipes, connecting steel plates and steel structure trusses; the steel pipes comprise basic unit steel pipes, unit steel pipes and common steel pipes, first connecting parts are arranged on the pipe walls of the basic unit steel pipes in the axial direction, second connecting parts are arranged on the pipe walls of the unit steel pipes in the axial direction, and the first connecting parts and the second connecting parts are connected so that the unit steel pipes can be fixed to the basic unit steel pipes; a plurality of common steel pipes are arranged between the adjacent unit steel pipes on the top and the side. Groove holes are formed in the pipe walls of the steel pipes, and the connecting steel plates penetrate through the groove holes in the steel pipes and are fixed to the steel pipes. The steel structure truss penetrates through the groove holes and is fixed to the connecting steel plate. The transverse rigidity and the bearing capacity of the pipe roofing supporting structure are enhanced, the overall stability is improved, the situation that temporary supports need to be erected due to insufficient structural stability in the construction process is reduced, and therefore the utilization rate of construction operation space and underground space is increased.

Description

Technical Field

[0001] The present application belongs to the technical field of pipe curtain support, and specifically relates to a steel pipe-truss composite recyclable pipe curtain support system and a construction method thereof. Background Art

[0002] With the acceleration of urbanization, subway station construction is gradually moving towards deeper levels and larger spans. This trend places higher demands on the safety, economy, and environmental friendliness of support structures. The pipe curtain method, a technology that continuously drives steel pipes underground to form temporary or permanent support structures, is widely used in underground excavation projects for subway stations due to its advantages such as minimal ground disturbance and wide applicability. The pipe curtain method uses advanced support to form a continuous "pipe curtain wall" that bears the surrounding soil and water pressure and isolates the excavation area from the surrounding strata. Subsequently, the stratum is reinforced by grouting or filling the steel pipes with concrete to enhance the integrity of the stratum, reduce settlement, and ensure construction safety.

[0003] However, traditional pipe curtain support structures and their construction methods still have many significant defects. First, the structural performance and durability of traditional pipe curtain construction methods are insufficient. During construction, adjacent steel pipes are connected by locks, which makes the overall stability of the structure poor, and the lateral stiffness and bearing capacity are weak. Therefore, during the excavation process, temporary supports are often required to maintain the overall stiffness of the support structure, which not only greatly reduces the construction operation space, but also reduces the utilization rate of underground space. Secondly, existing pipe curtains mostly use ordinary steel pipes that are buried in the stratum at one time, and the materials cannot be recycled, resulting in waste of resources and high costs. Large-diameter pipe curtains are consumed in large quantities and are difficult to reversely eject, further increasing project costs.

[0004] In view of the problems of non-recyclable materials, low lateral bearing capacity, low underground space utilization, insufficient structural durability and large environmental disturbance, there is an urgent need to develop a steel pipe-truss composite recyclable pipe curtain support system and its construction method to achieve safe and efficient excavation of underground projects. Summary of the Invention

[0005] Therefore, the technical problem to be solved by this application is to provide a steel pipe-truss composite recyclable pipe curtain support system and its construction method, which can at least solve one of the technical problems of non-recyclable materials, low lateral bearing capacity, low underground space utilization, insufficient structural durability and large environmental disturbance.

[0006] In order to solve the above problems, the first aspect of the present application provides a steel pipe-truss composite recyclable pipe curtain support system, including steel pipes, connecting steel plates and steel structure trusses; the steel pipes include basic unit steel pipes, unit steel pipes and ordinary steel pipes, the wall of the basic unit steel pipe is provided with a first connecting part along the axial direction, the wall of the unit steel pipe is provided with a second connecting part along the axial direction, the first connecting part is connected to the second connecting part so that the unit steel pipe is fixed on the basic unit steel pipe; a plurality of ordinary steel pipes are arranged between adjacent unit steel pipes at the top and side; a slot is opened on the wall of the steel pipe, the connecting steel plate passes through the slot on the steel pipe and is fixed to the plurality of steel pipes; the steel structure truss passes through the slot and is fixed on the connecting steel plate.

[0007] Optionally, the first connecting portion is a slide groove opened along the axial direction, the unit steel pipe is provided with a first opening along the axial direction, and the guide block adapted to the slide groove is provided on the end face of the first opening.

[0008] Optionally, adjacent steel pipes form an angle at the position where the slots are opened, and reinforcing ribs are provided on the inner wall of the steel pipe at the angle position.

[0009] Optionally, a second opening is provided on the side of the ordinary steel pipe away from the soil.

[0010] Optionally, the diameter of the basic unit steel pipe is larger than the diameters of the unit steel pipe and the ordinary steel pipe.

[0011] A second aspect of the present application provides a construction method for a steel pipe-truss composite recyclable pipe-roof support system as described in any one of the above, comprising:

[0012] Determine the jacking position according to the shape of the excavation section, and jack the steel pipe to a set depth position in sequence based on the jacking position; the steel pipe includes a basic unit steel pipe, a unit steel pipe and an ordinary steel pipe;

[0013] Slot all steel pipes, pass the connecting steel plates through the slots and connect and secure them to the steel pipes;

[0014] The steel structure truss is erected in the tube curtain to form a tube curtain support structure together with the tube curtain;

[0015] excavating the soil below the pipe-roof supporting structure;

[0016] The formwork was set up and the bottom plate, side walls and top plate were poured to complete the construction of the subway station structure.

[0017] Optionally, the step of determining the jacking position according to the excavation cross-sectional shape, and sequentially jacking the steel pipe to a set depth position based on the jacking position; wherein the steel pipe includes a basic unit steel pipe, a unit steel pipe, and an ordinary steel pipe, comprises:

[0018] Determine the insertion position of the basic unit steel pipe according to the shape of the excavation cross section, and push the basic unit steel pipe into the excavation cross section with the insertion position as the base point;

[0019] Pushing the unit steel pipe into the excavated section, and locking the unit steel pipe with the basic unit steel pipe;

[0020] A plurality of common steel pipes are pushed in simultaneously between the adjacent unit steel pipes at the top and the side.

[0021] Optionally, the step of erecting the steel structure truss in the tube roof to form a tube roof support structure together with the tube roof includes:

[0022] erecting the prefabricated steel structure trusses along the depth direction in the tube roof;

[0023] The truss steel pipe is hoisted into the basic unit steel pipe, and the truss steel pipe is used to erect the steel structure truss passing through the slot and arranged along the height and width directions of the pipe curtain; the steel structure truss along the height and width directions is connected to the prefabricated steel structure truss along the depth direction into one; the steel structure truss arranged along the height and width directions is connected to the connecting steel plate.

[0024] Optionally, after the step of erecting the steel structure truss through the slotted holes and connecting the steel structure truss to the connecting steel plate, the method further includes:

[0025] The pipe wall of the ordinary steel pipe away from the soil is cut off.

[0026] Optionally, during the steel pipe jacking process, bentonite is injected into the pipe head of the steel pipe.

[0027] By means of the above technical solution, the present invention has at least the following beneficial effects:

[0028] The embodiment of the present application provides a steel pipe-truss composite recyclable pipe curtain support system and its construction method, which adopts modular units as the core and is composed of basic unit steel pipes (high-strength alloy steel pipes), unit steel pipes, ordinary steel pipes, built-in connecting steel plates and steel structure trusses. The basic unit steel pipes and unit steel pipes are mechanically engaged with each other through prefabricated locking grooves, and cooperate with grouting channels to form multiple sealing barriers. This structural design significantly enhances the lateral stiffness and bearing capacity of the pipe curtain support structure, improves the overall stability, and reduces the need to erect temporary supports due to insufficient structural stability during construction, thereby improving the construction operation space and underground space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1This is a front view of the steel pipe-truss composite recyclable pipe-roof support system according to an embodiment of the present application;

[0030] Figure 2 This is a diagram of the pipe jacking position of the steel pipe-truss composite recyclable pipe curtain support system according to an embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of the side groove positions of the steel pipe of the basic unit of the steel pipe-truss composite recyclable pipe curtain support system according to an embodiment of the present application;

[0032] Figure 4 Schematic diagram of the side groove positions of the unit steel pipes and ordinary steel pipes of the steel pipe-truss composite recyclable pipe curtain support system according to an embodiment of the present application;

[0033] Figure 5 Schematic diagram of the locking method of the basic unit steel pipes and unit steel pipes of the steel pipe-truss composite recyclable pipe curtain support system according to an embodiment of the present application;

[0034] Figure 6 This is a schematic diagram of the position of the connecting steel plates of the steel pipe-truss composite recyclable pipe-roof support system in an embodiment of the present application.

[0035] Figure 7 This is a flow chart of the construction method of the steel pipe-truss composite recyclable pipe curtain support system according to an embodiment of the present application.

[0036] The reference numerals indicate:

[0037] 1. Basic unit steel pipe; 101. Chute;

[0038] 2. Unit steel pipe; 201, guide block;

[0039] 3. Ordinary steel pipe;

[0040] 4. Steel structure truss;

[0041] 5. Connect steel plates. DETAILED DESCRIPTION

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0044] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0045] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0046] See also Figures 1 to 6 As shown, according to the first aspect of the embodiment of the present application, a steel pipe-truss composite recyclable pipe curtain support system is provided, including steel pipes, connecting steel plates 5 and steel structure trusses 4; the steel pipes include basic unit steel pipes 1, unit steel pipes 2 and ordinary steel pipes 3, the wall of the basic unit steel pipe 1 is axially provided with a first connecting portion, the wall of the unit steel pipe 2 is axially provided with a second connecting portion, the first connecting portion is connected to the second connecting portion to fix the unit steel pipe 2 on the basic unit steel pipe 1; multiple ordinary steel pipes 3 are arranged between the unit steel pipes 2 at the top and the side; slots are opened on the wall of the steel pipe, the connecting steel plates 5 pass through the slots on the steel pipes and are fixed to multiple steel pipes; the steel structure trusses 4 pass through the slots and are fixed on the connecting steel plates 5.

[0047] It adopts modular units as the core, and is composed of basic unit steel pipe 1 (high-strength alloy steel pipe), unit steel pipe 2, ordinary steel pipe 3, built-in connecting steel plate 5 and steel structure truss 4. The basic unit steel pipe 1 and the unit steel pipe 2 are mechanically engaged through prefabricated locking grooves, and cooperate with grouting channels to form multiple sealing barriers. This structural design significantly enhances the lateral stiffness and bearing capacity of the pipe curtain support structure, improves the overall stability, and reduces the need to erect temporary supports due to insufficient structural stability during construction, thereby improving the construction operation space and underground space utilization.

[0048] The steel pipes are slotted in their walls, and the connecting steel plate 5 passes through the slots and is secured to the multiple steel pipes. In this embodiment, the excavation cross-section is rectangular, so the two slots on the basic unit steel pipe 1 are perpendicular to each other. The unit steel pipe 2 has a slot on the side of its wall opposite the second connecting portion, while the ordinary steel pipe 3 also has slots on the opposite side of its wall. At this point, the slots of the base unit steel pipe 1, unit steel pipe 2, and ordinary steel pipe 3, all located on the same plane, are interconnected. The connecting steel plate 5 passes through the slots on the basic unit steel pipe 1, unit steel pipe 2, and ordinary steel pipe 3 and is welded to form a single body. In other embodiments, other mechanical connection methods, such as bolting or riveting, may also be used.

[0049] Specifically, based on the shape of the excavation section, there are five basic unit steel pipes 1, four of which are located at the corners of the rectangular excavation section, and one is located at the center of the top of the rectangular excavation section. There are ten unit steel pipes 2, with one basic unit steel pipe 1 being compatible with two unit steel pipes 2; and the line connecting the two unit steel pipes 2 at the corners and the center of the basic unit steel pipe 1 is perpendicular to each other.

[0050] Among them, the steel structure truss 4 passes through the slot and is fixed on the connecting steel plate 5. In this embodiment, no ordinary steel pipe 3 is set between the two unit steel pipes 2 located at the ground of the rectangular excavation section. Therefore, except for the ground, other parts need to have built-in steel structure trusses 4 to support the whole and form a pipe curtain support structure.

[0051] The built-in steel structure truss 4 greatly improves the strength of the pipe curtain support structure, eliminating the need for temporary support structures to be erected during the construction process, thereby greatly increasing the construction operation space and improving the utilization rate of underground space, providing a wider operating space for the construction of subway stations, and facilitating subsequent construction operations and equipment installation.

[0052] In another embodiment, the first connecting portion is a slide groove 101 opened along the axial direction, the unit steel pipe 2 is provided with a first opening along the axial direction, and a guide block 201 adapted to the slide groove 101 is provided on the end face of the first opening.

[0053] The first connection portion is a chute 101 extending axially. This means the chute 101 extends axially along the basic unit steel pipe 1, is located on the outer surface of the basic unit steel pipe 1, and does not penetrate the wall of the basic unit steel pipe 1. The length of the chute 101 is determined based on the overall design requirements of the pipe curtain support structure and typically extends throughout the entire length of the basic unit steel pipe 1 to ensure a stable sliding connection between the unit steel pipes 2.

[0054] Specifically, the cross-sectional shape of the chute 101 can be rectangular, T-shaped, or other suitable shapes. Rectangular chute 101 is easy to manufacture and suitable for simple connection requirements; T-shaped chute 101 has better resistance to disengagement and can more firmly secure the guide block 201. The dimensions of the chute 101 (such as width and depth) are designed based on the dimensions of the guide block 201 on the unit steel pipe 2 to ensure a good fit between the two, while leaving an appropriate gap to reduce friction and allow for a certain degree of assembly error.

[0055] Specifically, the inner surface of the slide 101 can be subjected to appropriate surface treatment, such as sandblasting, plating or coating with lubricant, to improve its wear resistance and lubricity, and ensure good matching relationship between the unit steel pipe 2 and the basic unit steel pipe 1 when the unit steel pipe 2 is pushed forward.

[0056] The unit steel pipe 2 is provided with a first opening along the axial direction, and a guide block 201 is provided on the end face of the first opening, which is adapted to the chute 101. In other words, the unit steel pipe 2 is provided with a first opening along the axial direction, and the size and shape of the first opening are adapted to the outer diameter of the basic unit steel pipe 1, so that the unit steel pipe 2 can partially fit over the basic unit steel pipe 1. The shape and size of the guide block 201 fully match the chute 101 and can be tightly embedded in the chute 101. The guide block 201 can be made of high-strength alloy material to meet the requirements of structural strength and wear resistance. The connection between the guide block 201 and the unit steel pipe 2 can be welded, bolted, or other reliable mechanical connection methods to ensure that the guide block 201 will not loosen or fall off during use. Here, the guide block 201 is used to guide the unit steel pipe 2 to slide along the axial direction of the basic unit steel pipe 1, and at the same time, through cooperation with the chute 101, a mechanical engagement is achieved between the unit steel pipe 2 and the basic unit steel pipe 1. This engagement method can enhance the overall stability of the pipe curtain support structure, improve the lateral rigidity and load-bearing capacity.

[0057] The coordinated design of chute 101 and guide block 201 ensures a reliable connection between the unit steel pipe 2 and the basic unit steel pipe 1, enhancing the overall stability of the pipe-roof support structure, improving lateral rigidity and load-bearing capacity, and effectively addressing the insufficient lateral load-bearing capacity of traditional pipe-roof construction methods. The coordination of chute 101 and guide block 201 absorbs stress caused by uneven ground settlement or construction disturbances, making the pipe-roof support structure more adaptable, stable in complex underground environments, and reducing construction risks.

[0058] In another embodiment, adjacent steel pipes form an angle at the slot opening position, and reinforcing ribs are provided on the inner wall of the steel pipe at the angle position.

[0059] Among them, adjacent steel pipes form an angle at the slot opening position, and reinforcing ribs are provided on the inner wall of the steel pipe at the angle position. That is to say, the setting position of the reinforcing ribs corresponds one to one with the opening position of the slot hole; the arrangement of the reinforcing ribs at the angle of the slot opening position significantly improves the stiffness, stability and durability of the structure, and further increases the safety of adapting to complex construction environments.

[0060] In another embodiment, a second opening is provided on the side of the common steel pipe 3 away from the soil.

[0061] A second opening is opened on the side of the ordinary steel pipe 3 away from the soil. The second opening is arranged along the normal direction of the ordinary steel pipe 3. The main purpose is to facilitate material recycling and reuse without affecting the structural strength of the steel pipe, thereby reducing resource waste and lowering engineering costs.

[0062] In another embodiment, the diameter of the basic unit steel pipe 1 is larger than the diameters of the unit steel pipe 2 and the ordinary steel pipe 3. The basic unit steel pipe 1 adopts a larger diameter and is usually located at key positions of the pipe curtain support structure (such as the corners and upper middle position of the rectangular excavation section). The larger diameter can provide higher bending stiffness and compressive strength, so as to better withstand soil pressure and water pressure during construction, and ensure the stability and safety of the entire pipe curtain support structure. The diameters of the unit steel pipe 2 and the ordinary steel pipe 3 are smaller than the basic unit steel pipe 1, and are mainly used to fill other positions of the pipe curtain support structure to play an auxiliary support role. The smaller diameter makes it easier to push in and adjust the position of the ordinary steel pipe 3 and the unit steel pipe 2 during construction, while reducing material consumption and reducing engineering costs.

[0063] The second aspect of the embodiment of the present application provides a construction method for a steel pipe-truss composite recyclable pipe curtain support system applied to any one of the above items, such as Figure 7 As shown, the construction steps include the following:

[0064] Step S1, determine the jacking position according to the excavation cross-sectional shape, and jack the steel pipes to the set depth position in sequence based on the jacking position; the steel pipes include basic unit steel pipes 1, unit steel pipes 2 and ordinary steel pipes 3.

[0065] Step S11 , determining the insertion position of the basic unit steel pipe 1 according to the shape of the excavation cross section, and pushing the basic unit steel pipe 1 into the excavation cross section with the insertion position as a base point.

[0066] Specifically: In this embodiment, the excavation section is rectangular, so the jacking position is determined to be the corner position and the top middle position of the rectangular excavation section. Based on the determined jacking position, a mechanical device (such as a jack or hydraulic jacking equipment) is used to jack the basic unit steel pipe 1 into the excavation section with the jacking position as the base point. The basic unit steel pipe 1 is usually located at the key positions of the excavation section (such as the corner points and the upper middle position of the rectangular section). These positions are key parts that withstand soil pressure and water pressure. By jacking the basic unit steel pipe 1 with the designed jacking position as the base point, a stable support point can be provided for the entire pipe curtain support structure, ensuring the overall stability of the structure.

[0067] In step S12 , the unit steel pipe 2 is pushed forward to a set depth position, and the unit steel pipe 2 is locked with the basic unit steel pipe 1 .

[0068] Specifically, the first opening of the unit steel pipe 2 is aligned with the basic unit steel pipe 1, and the guide block 201 on the unit steel pipe 2 is aligned with the chute 101. The unit steel pipe 2 is axially pushed forward using a mechanical device (such as a jack or hydraulic jacking equipment), gradually embedding the guide block 201 into the chute 101 until the unit steel pipe 2 is tightly connected to the basic unit steel pipe 1. During the jacking process, the cooperation between the guide block 201 and the chute 101 ensures the precise alignment and stable connection of adjacent unit steel pipes, reduces installation errors, and improves construction efficiency and quality.

[0069] The combination of chute 101 and guide block 201 creates a slidable connection between the unit steel pipe 2 and the basic unit steel pipe 1. This connection effectively absorbs stress generated by uneven ground settlement or construction disturbances during construction, preventing structural damage caused by localized stress concentration, thereby improving the overall stability and reliability of the pipe-roof support structure. Furthermore, the combination of chute 101 and guide block 201 enhances the lateral rigidity of the pipe-roof support structure, reducing deformation caused by lateral forces during construction and ensuring construction safety.

[0070] In step S13, multiple common steel pipes 3 are simultaneously jacked in between adjacent unit steel pipes 2 at the top and sides. These pipes are primarily used to fill other areas of the pipe curtain support structure, providing auxiliary support. Jacking multiple common steel pipes 3 together significantly reduces the time required to lay the pipe curtain.

[0071] During the steel pipe jacking process, soil is excavated inside the pipe while the pipe is being pushed forward, and the position of the steel pipe is monitored by laser correction in real time. During the steel pipe jacking process, bentonite is injected into the pipe head to reduce the friction resistance between the steel pipe and the surrounding soil. At the same time, the lubricating film formed by the bentonite can effectively isolate the soil from the steel pipe surface, reducing the wear on the steel pipe surface.

[0072] Specifically, when it is detected that the jacking position is offset, the correction cylinder at the rear of the jacking machine head is used to apply asymmetric thrust, adjust the posture of the jacking machine head, and guide the subsequent pipe sections to gradually return to the original jacking position.

[0073] Step S2: slot holes are made in all steel pipes, and the connecting steel plates 5 are passed through the slot holes and connected and fixed to the steel pipes.

[0074] Among them, slots are made in all steel pipes; that is, workers enter the pipes and make slots on the pipe walls of the basic unit steel pipes 1, unit steel pipes 2 and ordinary steel pipes 3 along the depth direction of the pipe curtain; the purpose of making the slots is to install the connecting steel plates 5 and lay out the steel structure trusses 4 arranged along the height and width directions of the pipe curtain.

[0075] The connecting steel plates 5 are inserted through the slots and fixed to the steel pipes. Specifically, the connecting steel plates 5 are inserted through the slots extending along the width of the pipe curtain, forming connecting steel plates 5 extending along the width of the pipe curtain. Furthermore, the connecting steel plates 5 are inserted through the slots extending along the height of the pipe curtain, forming connecting steel plates 5 extending along the height of the pipe curtain. The connecting steel plates 5 are welded to the steel pipes. After all the connecting steel plates 5 are welded, the worker withdraws from the steel pipes. Welding the connecting steel plates 5 ensures the continuity and integrity of the pipe curtain. In other embodiments, the reinforcing ribs and the inner wall of the steel pipes, as well as the connecting steel plates 5 and the steel pipes, can also be connected by other mechanical means, such as bolts or rivets.

[0076] Step S3: erecting a steel structure truss 4 inside the tube roof to form a tube roof support structure together with the tube roof.

[0077] Step S31: Prefabricated steel trusses 4 are installed along the depth direction within the tube roof. Specifically, prefabricated steel trusses 4 are installed along the depth direction within the basic unit steel tubes 1, unit steel tubes 2, and common steel tubes 3. Specifically, a crane is used to lift the prefabricated steel trusses 4 and place them within the basic unit steel tubes 1, unit steel tubes 2, and common steel tubes 3, installing the prefabricated steel trusses 4 along the depth direction.

[0078] Step S32: hoist the truss steel pipe into the basic unit steel pipe (1), use the truss steel pipe to erect the steel structure truss (4) passing through the slot and arranged along the height direction and width direction of the pipe curtain; connect the steel structure truss (4) along the height direction and width direction with the prefabricated steel structure truss (4) along the depth direction into one; connect the steel structure truss (4) arranged along the height direction and width direction to the connecting steel plate (5), and finally form the pipe curtain support structure. The pipe curtain support structure forms an advanced pre-support system, which can maintain the stability of the excavation surface and reduce the risk of soil collapse during the excavation process.

[0079] Specifically, a crane is used to lift the truss steel pipe and place it inside the basic unit steel pipe 1. A robot then enters the basic unit steel pipe 1 to assemble the truss steel pipe and install the steel structure trusses 4, which are arranged along the height and width of the pipe curtain through multiple slots. The steel structure trusses 4 along the height and width are connected to the prefabricated steel structure trusses 4 along the depth. The steel structure trusses 4 arranged along the height and width are connected to the connecting steel plates 5. Anti-rust paint or anti-corrosion coating is applied to the welding area to prevent corrosion of the steel pipe and connecting steel plates 5 caused by the high temperatures generated during welding. When welding, start from the middle of the steel structure trusses 4 and the connecting steel plates 5 and gradually move toward both ends to reduce welding deformation.

[0080] In other embodiments, the steel structure trusses 4 along the height direction and the width direction are connected to the steel structure trusses 4 along the depth direction in an integrated manner by bolt connection or other reliable mechanical connection methods.

[0081] Step S4: excavating the soil below the pipe-roof supporting structure.

[0082] Step S5: cutting off the pipe wall of the common steel pipe 3 on the side away from the soil.

[0083] Specifically, after all the soil beneath the pipe-roof support structure is excavated, the pipe wall of the ordinary steel pipe 3 on the side away from the soil is removed. This facilitates material recycling and reuse without affecting the strength of the steel pipe structure, thereby reducing resource waste and lowering project costs.

[0084] Step S6: supporting the formwork and pouring the bottom plate, side walls and top plate to complete the construction of the subway station structure.

[0085] It adopts modular units as the core, and is composed of basic unit steel pipe 1 (high-strength alloy steel pipe), unit steel pipe 2, ordinary steel pipe 3, built-in connecting steel plate 5 and steel structure truss 4. The basic unit steel pipe 1 and the unit steel pipe 2 are mechanically engaged through prefabricated locking grooves, and cooperate with grouting channels to form multiple sealing barriers. This structural design significantly enhances the lateral stiffness and bearing capacity of the pipe curtain support structure, improves the overall stability, and reduces the need to erect temporary supports due to insufficient structural stability during construction, thereby improving the construction operation space and underground space utilization.

[0086] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0087] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A steel pipe-truss composite recyclable pipe curtain support system, characterized in that: include: A steel pipe, comprising a basic unit steel pipe (1), a unit steel pipe (2) and an ordinary steel pipe (3), wherein the wall of the basic unit steel pipe (1) is provided with a first connection portion along the axial direction, and the wall of the unit steel pipe (2) is provided with a second connection portion along the axial direction, wherein the first connection portion is connected to the second connection portion so that the unit steel pipe (2) is fixed to the basic unit steel pipe (1); and a plurality of ordinary steel pipes (3) are provided between the unit steel pipes (2) at the top and the side. A connecting steel plate (5), wherein a slot is provided on the wall of the steel pipe, and the connecting steel plate (5) passes through the slot on the steel pipe and is fixed to the plurality of steel pipes; A steel structure truss (4) passes through the slot and is fixed on the connecting steel plate (5).

2. The steel pipe-truss composite recyclable pipe-roof support system according to claim 1, characterized in that: The first connecting portion is a sliding groove (101) opened in the axial direction, the unit steel pipe (2) is provided with a first opening in the axial direction, and the guide block (201) adapted to the sliding groove (101) is provided on the end face of the first opening.

3. The steel pipe-truss composite recyclable pipe-roof support system according to claim 1, characterized in that: Adjacent steel pipes form an angle at the position where the slots are opened, and reinforcing ribs are provided on the inner wall of the steel pipe at the angle position.

4. The steel pipe-truss composite recyclable pipe-roof support system according to claim 1, characterized in that: The common steel pipe (3) is provided with a second opening on a side away from the soil.

5. The steel pipe-truss composite recyclable pipe-roof support system according to claim 1, characterized in that: The diameter of the basic unit steel pipe (1) is larger than the diameters of the unit steel pipe (2) and the ordinary steel pipe (3).

6. A construction method for the steel pipe-truss composite recyclable pipe-roof support system according to any one of claims 1 to 5, characterized in that: The construction steps include: The jacking position is determined according to the shape of the excavation cross section, and the steel pipe is jacked to a set depth position based on the jacking position to form a pipe curtain; the steel pipe includes a basic unit steel pipe (1), a unit steel pipe (2) and an ordinary steel pipe (3); Slots are made in all the steel pipes, and the connecting steel plates (5) are passed through the slots and fixedly connected to the steel pipes; The steel structure truss (4) is erected in the tube curtain to form a tube curtain support structure together with the tube curtain; excavating the soil below the pipe-roof supporting structure; The formwork was set up and the bottom plate, side walls and top plate were poured to complete the construction of the subway station structure.

7. The construction method of a steel pipe-truss composite recyclable pipe-roof support system according to claim 6, characterized in that: The step of determining the jacking position according to the excavation cross-sectional shape and sequentially jacking the steel pipe to a set depth position based on the jacking position; wherein the steel pipe includes a basic unit steel pipe (1), a unit steel pipe (2) and an ordinary steel pipe (3), comprises: Determining the insertion position of the basic unit steel pipe (1) according to the shape of the excavation cross section, and pushing the basic unit steel pipe (1) into the excavation cross section with the insertion position as a base point; Pushing the unit steel pipe (2) into the excavated cross section, and locking the unit steel pipe (2) with the basic unit steel pipe (1); A plurality of common steel pipes (3) are pushed in simultaneously between the adjacent unit steel pipes (2) at the top and the side.

8. The construction method of a steel pipe-truss composite recyclable pipe-roof support system according to claim 6, characterized in that: The step of erecting the steel structure truss (4) in the tube curtain to form a tube curtain support structure together with the tube curtain comprises: erecting the prefabricated steel structure truss (4) in the tube curtain along the depth direction; The truss steel pipe is hoisted into the basic unit steel pipe (1), and the steel structure truss (4) is erected through the slot and arranged along the height direction and width direction of the pipe curtain using the truss steel pipe; the steel structure truss (4) along the height direction and width direction is connected to the prefabricated steel structure truss (4) along the depth direction into one; and the steel structure truss (4) arranged along the height direction and width direction is connected to the connecting steel plate (5).

9. The construction method of a steel pipe-truss composite recyclable pipe-roof support system according to claim 6, characterized in that: Before the steps of supporting the formwork and pouring the bottom plate, side walls and top plate, the following steps are included: The pipe wall of the ordinary steel pipe (3) on the side away from the soil is cut off.

10. The construction method of a steel pipe-truss composite recyclable pipe-roof support system according to claim 6, characterized in that: During the steel pipe jacking process, bentonite is injected into the pipe head of the steel pipe.

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