Concrete-filled steel tube mechanized construction assembly type yielding joint suitable for tunnel surrounding rock large deformation control

Abstract

The invention discloses a concrete-filled steel tube mechanized construction assembly type yielding joint suitable for tunnel surrounding rock large deformation control, and belongs to the technical field of tunnel concrete-filled steel tube supporting. The concrete-filled steel tube mechanized construction assembly type yielding joint comprises a sleeve arranged at a concrete-filled steel tube pre-connection position, and a yielding mechanism is arranged on the side, close to a concrete-filled steel tube, in the sleeve; a reserved space is formed between the two yielding mechanisms, each yielding mechanism comprises two steel transverse plates arranged in a sleeve, steel vertical plates are symmetrically and fixedly connected between the two steel transverse plates, one sleeve is fixedly connected with a guide connection pressure bearing mechanism, the other sleeve is provided with an assembly connection pressure bearing mechanism, and the guide connection pressure bearing mechanism is fixedly connected with the guide connection pressure bearing mechanism. And the guide connection pressure-bearing mechanism is matched with the assembly connection pressure-bearing mechanism. The adjacent steel pipe concrete can be rotationally connected through the joint, the purpose of assembly is achieved, automatic and mechanical joint installation in the whole process is achieved, the labor intensity is relieved, and the construction progress is accelerated; by arranging the reserved space, the initial yielding supporting effect is achieved; the pressure of surrounding rock is fully released, and the supporting effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel steel tube concrete support, and in particular relates to a steel tube concrete mechanized construction assembled yielding node suitable for controlling large deformation of tunnel surrounding rocks. Background Art

[0002] At present, steel tube concrete support is generally used to deal with the problem of large deformation of surrounding rock in tunnels with high burial depth and high stress surrounding rock. Traditional steel tube concrete support adopts the strong support principle to strongly control the deformation of tunnel surrounding rock, and only allows small deformation of surrounding rock. Large deformation of high stress surrounding rock can easily damage steel tube concrete, resulting in an unsafe underground support environment and high cost of repeated support. In addition, traditional yield support requires a large number of nodes to be installed manually on site to connect steel tube concrete, and mechanical automated construction cannot be realized, resulting in a large number of workers working in unsafe underground spaces, which is inefficient, intensive and unsafe. Summary of the invention

[0003] The purpose of the present invention is to provide a steel tube concrete mechanized construction assembled yielding node suitable for controlling large deformation of tunnel surrounding rock, so as to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a steel tube concrete mechanized construction assembled pressure-yielding node suitable for controlling large deformation of tunnel surrounding rock, including a sleeve arranged at the pre-connection of the steel tube concrete, a pressure-yielding mechanism is provided on the side of the sleeve close to the steel tube concrete, and a reserved space is provided between the two pressure-yielding mechanisms. The pressure-yielding mechanism includes two steel horizontal plates arranged in the sleeve, and a steel vertical plate is symmetrically fixed between the two steel horizontal plates. A guiding connection pressure-bearing mechanism is fixed on one of the sleeves, and an assembly connection pressure-bearing mechanism is provided on the other sleeve, and the guiding connection pressure-bearing mechanism is adapted to the assembly connection pressure-bearing mechanism.

[0005] Preferably, the guiding connection pressure-bearing mechanism includes a connecting plate fixed to the sleeve, guide plates are symmetrically fixed on both sides of the connecting plate, a cavity is provided in the connecting plate, the pressure-releasing mechanism is located in the cavity, and a rotating pin through hole and a telescopic pin through hole are respectively provided on the guide plate, and the telescopic pin through hole and the rotating pin through hole are adapted to the assembly connection pressure-bearing mechanism.

[0006] Preferably, a first sliding surface inclined outward is provided on one side of the connecting plate close to the rotation pin shaft through hole, and a second sliding surface inclined inward is provided on the top of the guide plate.

[0007] Preferably, the assembly connection pressure-bearing mechanism includes two limiters fixedly connected to the sleeve, the two limiters are respectively provided with the rotating pin through hole and the telescopic pin through hole, and the two rotating pin through holes are provided with rotating pins passing through, and the rotating pins are fixedly connected to the guide plate through a high-strength nut.

[0008] Preferably, a telescopic pin is provided in the telescopic pin through hole.

[0009] Preferably, the sleeve comprises a U-shaped steel, a cover plate is provided on the outer side of the U-shaped steel, a bolt is passed through between the U-shaped steel and the cover plate, and the high-strength nut is provided at one end of the bolt located inside the U-shaped steel.

[0010] The present invention discloses the following technical effects: adjacent steel tube concrete can be rotatably connected through the node to achieve the purpose of assembly, realize the automatic mechanized installation of the node in the whole process, reduce labor intensity, speed up the construction progress, simple operation and save costs; by setting the reserved space, the initial pressure-releasing support effect is achieved; the surrounding rock pressure is fully released, the support effect is improved, multiple repeated support is avoided, the construction period is shortened and the construction cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0012] Figure 1 This is a front view of the assembled yielding node structure of the present invention;

[0013] Figure 2 It is a side view of the assembled yield node structure of the present invention;

[0014] Figure 3 It is a front view of the assembled pressure-yielding node structure after connection of the present invention;

[0015] Figure 4 It is a front view of the guide connection pressure bearing mechanism and the assembly connection pressure bearing mechanism structure of the assembled pressure-yielding node of the present invention;

[0016] Figure 5 It is a structural side view of the guide connection pressure bearing mechanism and the assembly connection pressure bearing mechanism of the assembled pressure-yielding node of the present invention;

[0017] Figure 6 The present invention is trying to release the pressure mechanism.

[0018] In the figure: 1. Bolt connection hole; 2. U-shaped steel; 3. Telescopic pin; 4. Pressure release mechanism; 5. Rotating pin; 6. High-strength nut; 7. Guide plate; 8. Connecting plate; 9. Limiter; 10. Steel horizontal plate; 11. Steel vertical plate; 13. Bolt; 14. Rotating pin through hole; 15. Telescopic pin through hole; 16. Steel tube concrete. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figure 1-Figure 6 As shown, this embodiment provides a steel tube concrete mechanized construction assembled yielding node suitable for controlling large deformation of tunnel surrounding rock, including a sleeve arranged at the pre-connection of steel tube concrete 16, a yielding mechanism 4 is provided on the side of the sleeve close to the steel tube concrete 16, and a reserved space is provided between the two yielding mechanisms 4. The yielding mechanism 4 includes two steel horizontal plates 10 arranged in the sleeve, and a steel vertical plate 11 is symmetrically fixed between the two steel horizontal plates 10. A guiding connection pressure-bearing mechanism is fixed on one of the sleeves, and an assembly connection pressure-bearing mechanism is provided on the other sleeve, and the guiding connection pressure-bearing mechanism is adapted to the assembly connection pressure-bearing mechanism.

[0022] Through this node, adjacent steel tube concrete 16 can be rotatably connected to achieve the purpose of assembly, realize the automatic mechanized installation of the node in the whole process, reduce labor intensity, speed up the construction progress, simple operation and save costs; by setting the reserved space, the initial pressure-releasing support effect is achieved; the surrounding rock pressure is fully released, the support effect is improved, repeated support is avoided, the construction period is shortened and the construction cost is reduced.

[0023] Further optimization scheme, the guide connection pressure bearing mechanism includes a connection plate 8 fixed to the sleeve, and the guide plates 7 are symmetrically fixed on both sides of the connection plate 8. A cavity is provided in the connection plate 8, and the pressure bearing mechanism 4 is located in the cavity. The guide plate 7 is respectively provided with a rotation pin through hole 14 and a telescopic pin through hole 15. The telescopic pin through hole 15 and the rotation pin through hole 14 are adapted to the assembly connection pressure bearing mechanism. It is used to fix the rotation pin 5 and the telescopic pin 3.

[0024] On the connection side, the cross section of the end of the casing does not overlap with the end of the pressure-releasing mechanism 4. The casing is extended by a distance compared to the pressure-releasing mechanism 4, so that a reserved space is formed between the pressure-releasing mechanisms 4 in the casings on both sides. After the high-strength nut 6 and the bolt 13 are tightened, the pre-tightening force of the bolt 13 generated by the two makes the U-shaped steel 2 and the cover plate form a static friction with the steel tube concrete 16 between the two when the structure is under pressure. The static friction offsets the pressure on the structure and achieves the initial compression resistance effect; when the pressure is greater than the static friction, the steel tube concrete 16 and the pressure-releasing mechanism 4 are displaced together in the reserved space to release the surrounding rock pressure until the pressure-releasing mechanism 4 on one side is displaced to contact the pressure-releasing mechanism 4 on the other side, and the pressure-releasing mechanism 4 is initially compressed to achieve the first pressure-releasing support effect;

[0025] Furthermore, after the first yielding support is achieved, the two yielding mechanisms 4 respectively pass through the rectangular space reserved by the connecting plate 8 and the space reserved between the two limiters 9, move to contact each other, and work together. The yielding mechanism 4 first uses the compressive resistance of low-carbon steel to achieve the effect of early support; as the surrounding rock pressure and deformation increase, the steel vertical plate 11 reaches the yield limit and produces plastic deformation, and the yielding mechanism 4 is used to compress and deform to release the surrounding rock pressure, so that the high-stress surrounding rock pressure is within the bearing capacity of the support; when the steel vertical plate is compressed and deformed so that the two steel horizontal plates 10 contact each other, the yielding mechanism 4 forms a strong support effect, thereby forming a support form that combines resistance and release, realizing double yielding support, and completing effective support for large deformation of the tunnel surrounding rock.

[0026] According to a further optimized solution, a first sliding surface inclined outward is provided on one side of the connecting plate 8 close to the rotation pin through hole 14, and a second sliding surface inclined inward is provided on the top of the guide plate 7.

[0027] A certain rotation space is given to the stopper 9 so that the stopper 9 can be rotated by the rotating pin 5, thereby forming a fixedly rotatable assembled steel tube concrete 16 structure.

[0028] A further optimized solution is that the assembly connection pressure-bearing mechanism includes two limiters 9 fixedly connected to the sleeve, the two limiters 9 are respectively provided with a rotating pin through hole 14 and a telescopic pin through hole 15, and a rotating pin 5 is penetrated in the two rotating pin through holes 14, and the rotating pin 5 is fixedly connected to the guide plate 7 through a high-strength nut 6.

[0029] According to a further optimized solution, a telescopic pin 3 is provided in the telescopic pin through hole 15 .

[0030] The telescopic pin 3 and the limiter 9 where it is located rotate. When the telescopic pin 3 contacts the guide plate 7, the upper end of the guide plate 7 forms a sliding surface inclined inward. As the telescopic pin 3 enters, the guide plate 7 applies pressure, and the telescopic pin 3 is compressed. When the two ends of the telescopic pin 3 enter the telescopic pin through holes 15 set on both sides of the guide plate 7, the node is fixed, realizing the full mechanized installation of the steel tube concrete 16 support.

[0031] According to a further optimized solution, the casing includes a U-shaped steel 2, a cover plate is provided on the outer side of the U-shaped steel 2, a bolt 13 is passed through between the U-shaped steel 2 and the cover plate, and a high-strength nut 6 is provided at one end of the bolt located inside the U-shaped steel 2.

[0032] The casing is connected to the cover plate by U-shaped steel 2 through bolts 13 passing through bolt connection holes 1, and is fixed on the side of U-shaped steel 2 using high-strength nuts 6. The casing is placed at the connection section of the steel tube concrete 16 to cover and protect the section of the steel tube concrete 16.

[0033] The present invention has a simplified node structure in which the single-section steel tube concrete 16 on both sides can be rotated and fixed only by rotating the pin shaft 5 and the rotating pin shaft; the initial pressure-yielding support effect is achieved by the combination of the pre-tightening force of the bolt 13 and the built-in reserved space of the casing; further cooperates with the pressure-yielding mechanism 4 to form a double pressure-yielding pressure-yielding support scheme; the support structure is composed of the casing, steel tube concrete 16, the pressure-yielding mechanism 4, the reserved space and the connecting node; the steel tube concrete 16 has this pressure-yielding method and assembly form.

[0034] A construction method for a steel tube concrete mechanized construction assembled yielding node suitable for controlling large deformation of tunnel surrounding rock, comprising the following steps:

[0035] S1. Install a casing at the connection of two steel tube concrete 16 located at the same vertical position, and set a pressure relief mechanism in the casing;

[0036] S2. Installing a guide connection pressure-bearing mechanism and an assembly connection pressure-bearing mechanism in two adjacent casings respectively;

[0037] S3, setting the rotating pin 5 in the rotating pin through hole 14; setting the telescopic pin 3 in the telescopic pin through hole 15.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 a limitation on the present invention.

[0039] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A steel tube concrete mechanized construction assembled pressure relief node suitable for controlling large deformation of tunnel surrounding rock, comprising a sleeve arranged at a pre-connection of a steel tube concrete (16), characterized in that: A pressure-releasing mechanism (4) is provided on one side of the sleeve close to the steel tube concrete (16), and a reserved space is provided between the two pressure-releasing mechanisms (4). The pressure-releasing mechanism (4) includes two steel horizontal plates (10) arranged in the sleeve, and a steel vertical plate (11) is symmetrically fixed between the two steel horizontal plates (10). A guiding connection pressure-bearing mechanism is fixed on one of the sleeves, and an assembly connection pressure-bearing mechanism is provided on the other sleeve, and the guiding connection pressure-bearing mechanism is compatible with the assembly connection pressure-bearing mechanism.

2. The steel tube concrete mechanized construction assembled yielding node suitable for large deformation control of tunnel surrounding rock according to claim 1 is characterized in that: The guide connection pressure-bearing mechanism comprises a connection plate (8) fixedly connected to the sleeve, guide plates (7) are symmetrically fixedly connected to the two sides of the connection plate (8), a cavity is provided in the connection plate (8), the pressure-releasing mechanism (4) is located in the cavity, and a rotating pin shaft through hole (14) and a telescopic pin shaft through hole (15) are respectively provided on the guide plate (7), and the telescopic pin shaft through hole (15) and the rotating pin shaft through hole (14) are adapted to the assembly connection pressure-bearing mechanism.

3. The steel tube concrete mechanized construction assembled yielding node suitable for large deformation control of tunnel surrounding rock according to claim 2 is characterized by: A first sliding surface inclined outward is provided on one side of the connecting plate (8) close to the rotating pin shaft through hole (14), and a second sliding surface inclined inward is provided on the top of the guide plate (7).

4. The steel tube concrete mechanized construction assembled yielding node suitable for large deformation control of tunnel surrounding rock according to claim 2 is characterized by: The assembly connection pressure bearing mechanism comprises two limiters (9) fixedly connected to the sleeve, the two limiters (9) are respectively provided with the rotation pin shaft through hole (14) and the telescopic pin shaft through hole (15), and a rotation pin shaft (5) is inserted into the two rotation pin shaft through holes (14), and the rotation pin shaft (5) is fixedly connected to the guide plate (7) through a high-strength nut (6).

5. The steel tube concrete mechanized construction assembled yielding node suitable for large deformation control of tunnel surrounding rock according to claim 2 is characterized in that: A telescopic pin (3) is arranged in the telescopic pin through hole (15).

6. The steel tube concrete mechanized construction assembled yielding node suitable for large deformation control of tunnel surrounding rock according to claim 4 is characterized in that: The sleeve comprises a U-shaped steel (2), a cover plate is provided on the outer side of the U-shaped steel (2), a bolt (13) is passed between the U-shaped steel (2) and the cover plate, and the high-strength nut (6) is provided at one end of the bolt (13) located inside the U-shaped steel (2).

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