Pre-stress corrugated steel pipe sheet vertical shaft primary support structure

Abstract

The utility model discloses a pre-stress corrugated steel pipe piece vertical shaft primary support structure, and belongs to the technical field of vertical shaft construction. A pre-stress corrugated steel pipe piece vertical shaft primary supporting structure comprises an arc-shaped supporting plate of a multi-layer corrugated structure, a supporting rod is installed at the wave trough position of the arc-shaped supporting plate through a connecting base, an anti-skid gasket is arranged between the supporting rod and the connecting base, and the pre-stress corrugated steel pipe piece vertical shaft primary supporting structure further comprises a connecting piece fixedly installed on the arc-shaped supporting plate. The two ends of the connecting piece are provided with inserting ends matched with the supporting rods and prestress systems fixedly connected with the arc-shaped supporting plates, the other end of the connecting piece is inserted into the shaft surrounding rock and used for providing active supporting of a shaft foundation pit, a bearing ring can be rapidly formed through on-site hoisting, splicing and mounting, the surrounding rock pressure generated in the early stage of shaft excavation is borne in time, and meanwhile the supporting effect is improved. The supporting rods are tightly matched with the connecting pieces through the inserting ends, so that the supporting rods generate external expansion force on the arc-shaped supporting plates, and then the arc-shaped supporting rods are tightly attached to the surface of surrounding rock, and the stable supporting effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of shaft construction technology, and in particular to an initial support structure for a prestressed corrugated steel segment shaft. Background Technology

[0002] With the rapid development of urbanization and infrastructure construction, the development and utilization of underground space has become increasingly important. As a key structure connecting the ground and underground spaces, shafts play an indispensable role in projects such as subways, mines, and water conservancy and hydropower projects. Shafts are not only used for the entry and exit of personnel and equipment, but also undertake functions such as ventilation and drainage. Therefore, their safety and stability are of paramount importance.

[0003] Due to the limited space on the operating platform of the shaft boring machine and the difficulty in transporting concrete aggregates, traditional shotcrete construction under these conditions involves complex procedures, high construction difficulty, and long construction time. Especially in areas with poor surrounding rock conditions, the limited construction conditions on the shaft boring machine make it impossible to carry out anchor spraying support in a timely manner to stabilize the surrounding rock, making it difficult to achieve the desired support effect. Utility Model Content

[0004] The purpose of this utility model is to solve the problem in the existing technology that due to the limited construction conditions on the shaft tunneling machine, it is impossible to carry out anchor spraying support in time to stabilize the surrounding rock, and it is difficult to achieve the ideal support effect. Therefore, a prestressed corrugated steel pipe segment initial support structure for shaft is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A prestressed corrugated steel segment shaft initial support structure includes an arc-shaped support plate with a multi-layer corrugated structure. Support rods are installed at the troughs of the arc-shaped support plate via connecting seats. Anti-slip pads are provided between the support rods and the connecting seats. The structure also includes a connector fixedly installed on the arc-shaped support plate. Both ends of the connector have plug-in ends adapted to the support rods. A prestressed system is fixedly connected to the arc-shaped support plate, and the other end is inserted into the surrounding rock of the shaft to provide active support for the shaft foundation pit.

[0007] To ensure the support rod can be securely installed and provide uniform preload, preferably, the connector further includes a mounting sleeve, in which a first wedge block is slidably mounted at the center, and second wedge blocks abut against both sides of the first wedge block. The insertion end is fixedly connected to the second wedge block. A threaded sleeve is fixedly mounted inside the mounting sleeve, and a countersunk hole communicating with the threaded sleeve is formed on the surface of the mounting sleeve. A screw is threaded into the threaded sleeve, and the screw is rotatably connected to the first wedge block.

[0008] To facilitate tool use, the mounting sleeve and the threaded sleeve are further perpendicular to each other in axial direction.

[0009] In order to automatically expand and contract according to the actual situation and adjust the preload to ensure that the arc-shaped support plate always maintains good contact with the surrounding rock, a spring is further provided on the plug end, and the two ends of the spring abut against the inner side wall of the mounting sleeve and the second wedge block, respectively.

[0010] In order to effectively enhance the pressure transmission capacity of the support plate to the surrounding rock and provide the necessary outward support force, preferably, the prestressed system includes steel anchors and steel strands, and the diameter of the steel anchors and steel strands and their distribution in the circumferential direction of the shaft wall are proportional to the initial support thickness of the shaft.

[0011] To ensure that the prestress can be evenly distributed throughout the support structure, angle steel plates are welded onto the steel anchor rods to form barbs.

[0012] To further reduce construction time, both the steel anchor rods and the steel strands are anchored with resin anchoring agent, and a normal preload is applied when fixing the arc-shaped support plate.

[0013] Compared with the prior art, this utility model provides an initial support structure for prestressed corrugated steel segment shafts, which has the following beneficial effects:

[0014] 1. This prestressed corrugated steel pipe segment initial support structure for shafts can quickly form a bearing ring through on-site hoisting, splicing, and installation, promptly bearing the surrounding rock pressure generated in the early stages of shaft excavation. At the same time, the support rods are tightly fitted with the connectors through the plug-in ends, causing the support rods to generate an outward expansion force on the arc-shaped support plate, thereby closely adhering to the surrounding rock surface and forming a stable support effect. In addition, in areas with poor surrounding rock, a certain amount of prestress can be applied to the prestressed system, providing active support force in the early stages of shaft excavation.

[0015] 2. The initial support structure of this prestressed corrugated steel pipe segment shaft, through the setting of the spring built into the connector, if the surrounding rock undergoes slight deformation or displacement, the spring can automatically extend and retract according to the actual situation to adjust the preload, ensuring that the arc support plate always maintains good contact with the surrounding rock. If necessary, the position of the first wedge block can be finely adjusted by rotating the screw again to reset the preload to adapt to different construction needs.

[0016] 3. The prestressed corrugated steel pipe segment initial support structure for vertical shafts effectively solves the problems of complex procedures, high construction difficulty, long construction time, and inability to provide sufficient support force to the surrounding rock of the shaft in a timely manner when using a shaft tunneling machine for construction. These problems are caused by the limited construction conditions on the shaft tunneling machine, the small space of the operating platform, and the difficulty in transporting concrete aggregates. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an arc-shaped support plate structure for the initial support structure of a prestressed corrugated steel pipe segment vertical shaft proposed in this utility model.

[0018] Figure 2 This is a schematic diagram of the connection seat and support rod installation structure of the initial support structure of the prestressed corrugated steel pipe segment vertical shaft proposed in this utility model.

[0019] Figure 3 This is a schematic diagram of the connecting component structure of the initial support structure of the prestressed corrugated steel pipe segment shaft proposed in this utility model.

[0020] Figure 4 This is a schematic diagram of the prestressed system structure of the initial support structure for a prestressed corrugated steel pipe segment shaft proposed in this utility model. Detailed Implementation

[0021] In the diagram: 1. Arc-shaped support plate; 2. Connecting seat; 3. Support rod; 4. Anti-slip pad; 5. Connector; 501. Plug-in end; 502. Mounting sleeve; 503. First wedge block; 504. Second wedge block; 505. Threaded sleeve; 506. Countersunk hole; 507. Screw; 508. Spring; 6. Prestressed system; 601. Rebar anchor; 602. Steel strand; 603. Angle steel sheet.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Example:

[0025] Reference Figures 1-4 A prestressed corrugated steel segment shaft initial support structure includes an arc-shaped support plate 1 with a multi-layered corrugated structure. The arc-shaped support plate 1 is a prefabricated component. The appropriate thickness and corrugation type of the arc-shaped support plate 1 are selected according to the surrounding rock conditions of the shaft. Through on-site hoisting, splicing, and installation, a load-bearing ring can be quickly formed to promptly bear the surrounding rock pressure generated in the initial stage of shaft excavation. Support rods 3 are installed at the troughs of the arc-shaped support plate 1 via connecting seats 2. Anti-slip pads 4 are provided between the support rods 3 and the connecting seats 2 to prevent slippage due to… The displacement caused by external pressure ensures that it can withstand the pressure from the surrounding rock without significant deformation. It also includes a connector 5 fixedly installed on the arc-shaped support plate 1. Both ends of the connector 5 have plug-in ends 501 that are adapted to the support rod 3. It also includes a prestressed system 6 fixedly connected to the arc-shaped support plate 1, with the other end inserted into the surrounding rock of the shaft. This allows the arc-shaped support plate 1 to be subjected to a uniformly distributed outward expansion force, ensuring that it fits tightly against the surface of the surrounding rock and forms a stable support effect, which is used to provide active support for the shaft foundation pit.

[0026] Based on the specific geological conditions of the surrounding rock of the shaft (such as rock type, hardness, and fissure development), select an arc-shaped support plate 1 of appropriate thickness and corrugation type, and complete all necessary processing steps, including welding the connecting seat 2 of the support rod 3, installing anti-slip pads 4, and fixing the connecting parts 5. Safely transport the prefabricated arc-shaped support plate 1 to the construction site and use a crane or other hoisting equipment to lift it into the shaft. According to the design drawings, assemble the arc-shaped support plates 1 sequentially inside the shaft to form a complete load-bearing ring. Adjacent arc-shaped support plates 1 are mechanically connected by high-strength locking buckles, and elastic sealing strips are installed at the joints to prevent groundwater seepage. The support rod 3 is tightly fitted with the connecting parts 5 through the plug end 501, so that the support rod 3 generates an outward expansion force on the arc-shaped support plate 1, thereby closely adhering to the surface of the surrounding rock and forming a stable support effect. At the same time, in areas with poor surrounding rock, a certain amount of prestress can be applied to the prestressed system 6 to provide active support force in the early stage of shaft excavation.

[0027] To ensure the support rod 3 is securely installed and provides uniform preload, the connector 5 further includes a mounting sleeve 502. A first wedge block 503 is slidably mounted at the center of the mounting sleeve 502. Second wedge blocks 504 abut against both sides of the first wedge block 503. The insertion end 501 is fixedly connected to the second wedge blocks 504. When the first wedge block 503 moves, the wedge-shaped surface pushes the second wedge block 504 outwards, thereby causing the insertion end 501 to move outwards. The mounting sleeve 502... A threaded sleeve 505 is fixedly installed inside. The axis directions of the mounting sleeve 502 and the threaded sleeve 505 are perpendicular to each other. A countersunk hole 506 is opened on the surface of the mounting sleeve 502, which is in communication with the threaded sleeve 505. A screw 507 is installed on the internal thread of the threaded sleeve 505. The screw 507 is rotatably connected to the first wedge block 503. Tools such as wrenches are allowed to be used to rotate the screw 507. A spring 508 is sleeved on the insertion end 501. The two ends of the spring 508 abut against the inner side wall of the mounting sleeve 502 and the second wedge block 504, respectively.

[0028] Without any external force applied, the spring 508 is in a naturally extended state, the first wedge block 503 is located at the innermost side of the mounting sleeve 502, and the second wedge block 504 and the insertion end 501 are also in the corresponding retracted position. When the support rod 3 is inserted into the insertion end 501 of the connector 5, since the insertion end 501 is fixedly connected to the second wedge block 504, the insertion of the support rod 3 will compress the spring 508, causing the second wedge block 504 to retract inward, which facilitates the smooth entry of the support rod 3. Once the support rod 3 is fully inserted, the position of the first wedge block 503 can be adjusted by rotating the screw 507. As the screw 507 rotates, the first wedge block 503 slides along the inside of the mounting sleeve 502 and pushes the second wedge blocks 504 on both sides outward. After being pushed, the second wedge blocks 504 expand outward, thereby pushing the insertion end 501 to move outward. At the same time, the spring 508 generates a greater elastic force due to being further compressed. This elastic force is transmitted to the support rod 3 through the second wedge block 504, forming a uniformly distributed preload force, which causes the support rod 3 to generate an outward expansion force on the support plate.

[0029] If the surrounding rock undergoes slight deformation or displacement, the spring 508 can automatically extend and retract according to the actual situation to adjust the preload and ensure that the arc-shaped support plate 1 always maintains good contact with the surrounding rock. If necessary, the position of the first wedge block 503 can be finely adjusted by rotating the screw 507 again to reset the preload and adapt to different construction needs.

[0030] In order to effectively enhance the pressure transmission capacity of the arc-shaped support plate 1 to the surrounding rock and provide the necessary outward expansion support force, the prestressed system 6 includes steel anchor rods 601 and steel strands 602. The diameter of the steel anchor rods 601 and steel strands 602 and their distribution in the circumferential direction of the shaft wall are proportional to the initial support thickness of the shaft. Furthermore, angle steel plates 603 are welded to the steel anchor rods 601 to form barbs. Both the steel anchor rods 601 and steel strands 602 are anchored with resin anchoring agent, and a normal preload is applied when fixing the arc-shaped support plate 1.

[0031] The number of steel anchor bolts 601 and steel strands 602 distributed circumferentially on the shaft wall is also proportional to the initial support thickness of the shaft. This means that as the support thickness increases, the number of steel anchor bolts 601 and steel strands 602 will also increase accordingly to ensure that the prestress can be evenly distributed throughout the support structure. Furthermore, a reasonable spacing not only helps to improve the overall performance of the prestressing system 6, but also avoids local stress concentration. Under normal circumstances, the steel anchor bolts 601 and steel strands 602 will be arranged according to a certain pattern to ensure that each point can withstand appropriate pressure.

[0032] Installation process of the prestressed system 6:

[0033] 1. Drill holes in the shaft wall; the depth and diameter should meet the design requirements.

[0034] 2. Insert the steel anchor rod 601 and steel strand 602 into the drilled hole and fill them with resin anchoring agent for fixation;

[0035] 3. Ensure the anchoring agent is fully cured before proceeding to the next step to guarantee a tight bond between the steel anchor rod 601 and the steel strand 602 and the well wall;

[0036] 4. Apply normal preload to the steel anchor 601 and steel strand 602. This preload is transmitted to the well wall through the steel anchor 601, so that the arc-shaped support plate 1 is subjected to a uniformly distributed outward expansion force and tightly adheres to the surrounding rock surface.

[0037] 5. When applying prestress, attention should be paid to gradual loading to ensure uniform distribution of prestress and avoid excessive local stress that could lead to structural damage.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A prestressed corrugated steel segment shaft initial support structure, comprising an arc-shaped support plate (1) with a multi-layer corrugated structure, characterized in that, The trough of the arc-shaped support plate (1) is fitted with a support rod (3) via a connecting seat (2), and an anti-slip pad (4) is provided between the support rod (3) and the connecting seat (2); It also includes a connector (5) fixedly installed on the arc-shaped support plate (1), the two ends of the connector (5) having plug-in ends (501) adapted to the support rod (3); In addition, a prestressed system (6) fixedly connected to the arc-shaped support plate (1) is inserted into the surrounding rock of the shaft at the other end to provide active support for the shaft foundation pit.

2. The initial support structure for a prestressed corrugated steel segment shaft according to claim 1, characterized in that, The connector (5) further includes a mounting sleeve (502), a first wedge block (503) is slidably mounted at the center of the mounting sleeve (502), and second wedge blocks (504) abut against both sides of the first wedge block (503). The insertion end (501) is fixedly connected to the second wedge blocks (504). The mounting sleeve (502) has a threaded sleeve (505) fixedly installed inside. The mounting sleeve (502) has a countersunk hole (506) that communicates with the threaded sleeve (505) on its surface. The threaded sleeve (505) has a screw (507) threaded inside it. The screw (507) is rotatably connected to the first wedge block (503).

3. The initial support structure for a prestressed corrugated steel segment shaft according to claim 2, characterized in that, The mounting sleeve (502) and the threaded sleeve (505) are perpendicular to each other in axial direction.

4. The initial support structure for a prestressed corrugated steel segment shaft according to claim 3, characterized in that, A spring (508) is sleeved on the plug end (501), and the two ends of the spring (508) abut against the inner side wall of the mounting sleeve (502) and the second wedge block (504), respectively.

5. The initial support structure for a prestressed corrugated steel segment shaft according to claim 1, characterized in that, The prestressed system (6) includes steel anchor rods (601) and steel strands (602). The diameter of the steel anchor rods (601) and the number of steel strands (602) distributed in the circumferential direction of the shaft wall are proportional to the initial support thickness of the shaft.

6. The initial support structure for a prestressed corrugated steel segment shaft according to claim 5, characterized in that, Angle steel plates (603) are welded onto the steel anchor rod (601) to form barbs.

7. The initial support structure for a prestressed corrugated steel segment shaft according to claim 6, characterized in that, Both the steel anchor rod (601) and the steel strand (602) are anchored with resin anchoring agent, and a normal preload is applied when fixing the arc-shaped support plate (1).

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