Step-type portal frame for tunnel roof lifting

Abstract

The utility model provides a step-type portal frame for tunnel roof lifting. The step-type portal frame comprises a portal frame body and a primary supporting frame arranged on the inner side of the portal frame body. The portal frame body comprises a top supporting frame and step supporting frames correspondingly arranged at the left end and the right end of the top supporting frame, each step supporting frame comprises at least two steps, the upper portions of the step supporting frames are connected with the top supporting frame, and supporting leg frames are arranged below the step supporting frames; the primary supporting frame comprises an upper arc-shaped support and a lower arc-shaped support, the arc top of the upper arc-shaped support faces the top supporting frame, and an opening of the lower arc-shaped support faces the top supporting frame. The top supporting frame, the step supporting frame and the supporting leg frame are all connected with the upper arc-shaped support, and the left end and the right end of the lower arc-shaped support are connected with the left end and the right end of the upper arc-shaped support respectively. The step-shaped portal frame for tunnel roof lifting has the advantages of being good in integrality and flexible and convenient to construct.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of tunnel construction, especially a step type portal for tunnel roof picking. BACKGROUND

[0002] In the roof picking construction process, the traditional roof picking method adopts the integral portal, but the integral portal is inconvenient to assemble in the tunnel, and the structural strength is poor after assembly, and in the actual construction process, the excavation amount behind the integral portal is large, which easily causes serious waste of concrete, and the self-weight of the concrete is too large, so it is easy to cause arch collapse and large-scale spouting behind the portal, which is not dense and forms a cavity, in addition, multiple blasting and cannon head processing are required during the excavation process, which also easily causes disturbance of the surrounding rock, and there is a risk of arch collapse and arch collapse, so the portal needs to have good structural strength and stability, but the existing integral portal has the problems of poor structural strength and inconvenient construction, which is not conducive to convenient and safe excavation construction. SUMMARY

[0003] Therefore, the utility model aims at providing a step type portal for tunnel roof picking to solve the problems of poor structural strength and inconvenient construction of the existing integral portal.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0005] A step type portal for tunnel roof picking, comprising a portal body and an initial support frame arranged on the inner side of the portal body.

[0006] The portal body comprises a top support frame and step support frames arranged on the left and right ends of the top support frame, the step support frame comprises at least two steps, the upper part of the step support frame is connected with the top support frame, and the lower part is provided with a support leg frame.

[0007] The initial support frame comprises an upper arc-shaped support and a lower arc-shaped support, the arc top of the upper arc-shaped support is arranged towards the top support frame, and the opening of the lower arc-shaped support is arranged towards the top support frame; the top support frame, the step support frame and the support leg frame are connected with the upper arc-shaped support, and the left and right ends of the lower arc-shaped support are connected with the left and right ends of the upper arc-shaped support.

[0008] Further, the top support frame and the step support frame, and the step support frame and the support leg frame are connected through reinforcing plates.

[0009] Further, the reinforcing plates are arranged at least at intervals.

[0010] Further, the top support frame, the step support frame, the support leg frame, the upper arc-shaped support and the lower arc-shaped support are all made of double-spliced I-beams.

[0011] Further, the top support frame, the step support frame and the leg frame are all made of two spliced double-spliced I-beams.

[0012] Further, the step support frame comprises a vertical end and a horizontal end, and the horizontal end is provided with an arc surface part matched with the upper arc-shaped support at one end of the upper arc-shaped support.

[0013] Further, the vertical end and the horizontal end are connected through a connecting plate, and the connecting plate is arranged at intervals at least twice, and each connecting plate is connected at one end with the vertical end and at the other end with the horizontal end.

[0014] Further, the step support frame is provided with a shielding cover for shielding the connecting part of the vertical end and the horizontal end, and the shielding cover is detachably mounted on the step support frame.

[0015] Further, the upper arc-shaped support comprises an upper arc-shaped section and a lower support section, and the support section is provided with two at the left and right ends of the arc-shaped section; the arc top of the arc-shaped section is connected with the top support frame, the arc surface of the arc-shaped section is connected with the step support frame, and the left and right ends of the arc-shaped section are respectively connected with the two leg frames.

[0016] Further, the support section is arranged in an inclined manner, and the support section is connected at one end with the arc-shaped section and at the other end with the leg frame at an acute angle.

[0017] Compared with the prior art, the step type portal frame for tunnel roof picking has the following advantages:

[0018] The step type portal frame for tunnel roof picking has the advantages of good integrity and flexible and convenient construction, the top support frame, the step support frame and the leg frame are spliced on site, the operation is simple, the step support frame is beneficial to the excavation of both sides of the portal frame, the excavation can also be carried out according to the initial support frame contour in the portal frame body, the secondary excavation at the side corners can be avoided, the disturbance of blasting to the surrounding rock is reduced, and the stability of the tunnel structure is beneficial. By using this step type portal frame, the excavation amount is also reduced, the amount of sprayed concrete and secondary lining concrete is reduced, unnecessary material waste is avoided, the safety hidden danger caused by the self weight of the concrete is reduced, the risk of the existence of a cavity behind the portal frame is reduced, and the safety of the intersection position is ensured. In addition, the shielding cover arranged on the step support frame can also protect the welding position, reduce the post-period chiseling engineering quantity, and is beneficial to rapid construction. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A structure schematic view of a stepped gantry for tunnel roof picking according to an embodiment of the present application.

[0021] Marked explanation:

[0022] 1, top support frame; 2, stepped support frame; 3, support leg frame; 4, upper arc-shaped support; 5, lower arc-shaped support; 6, shielding cover; 7, reinforcing plate; 8, connecting plate; 9, arc-shaped section; 10, support section. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] A stepped gantry for tunnel roof picking, as shown in Figure 1 The stepped gantry for tunnel roof picking comprises a gantry body and a primary support frame arranged on the inner side of the gantry body.

[0028] The door frame body comprises a top support frame 1 and a stepped support frame 2 arranged at both ends of the top support frame 1, the stepped support frame 2 comprises at least two steps, the top of the stepped support frame 2 is connected with the top support frame 1, and the bottom of the stepped support frame 2 is provided with a support leg frame 3.

[0029] The primary support frame comprises an upper arc-shaped support frame 4 and a lower arc-shaped support frame 5, the top of the upper arc-shaped support frame 4 is arranged towards the top support frame 1, and the opening of the lower arc-shaped support frame 5 is arranged towards the top support frame 1; the top support frame 1, the stepped support frame 2 and the support leg frame 3 are all connected with the upper arc-shaped support frame 4, and the left and right ends of the lower arc-shaped support frame 5 are respectively connected with the left and right ends of the upper arc-shaped support frame 4.

[0030] The top support frame 1, the stepped support frame 2, the support leg frame 3, the upper arc-shaped support frame 4 and the lower arc-shaped support frame 5 can be integrally machined and then transported to the tunnel construction site for welding and splicing, which reduces the construction difficulty of the door frame and is beneficial to improve the convenience of the construction of the door frame.

[0031] In actual application, the position, height and length of the steps on the door frame body can be calculated by using CAD drawing software, and the door frame body under different step heights can be simulated by using BIM technology core software Revit, the stress of the primary support frame under different step heights and positions is analyzed, and the door frame shape is drawn, which is produced by a steel member prefabrication plant and spliced on site.

[0032] Preferably, the top support frame 1 and the stepped support frame 2, and the stepped support frame 2 and the support leg frame 3 are connected by a reinforcing plate 7. The reinforcing plate 7 is arranged at intervals.

[0033] In actual application, the stepped support frame 2 can adopt two steps, three steps or multiple steps, and the skilled person in the art can select a stepped support frame 2 with a suitable number of steps according to the construction needs, which improves the applicability of the door frame. By arranging multiple stepped support frames 2, the subsequent positive hole arc-shaped primary support frame and the door frame body are conveniently connected, multiple points are connected, which is beneficial to improve the structural strength and stability of the door frame as a whole. At the same time, it is also beneficial to improve the stability of the top cantilever structure, so that the subsequent positive hole excavation is more simple and convenient, safe and reliable.

[0034] The top support frame 1, the step support frame 2, the leg support frame 3, the upper arc-shaped support frame 4 and the lower arc-shaped support frame 5 are all made of double-ply I-beams. For example, the top support frame 1, the step support frame 2 and the leg support frame 3 are all made of two double-ply I-beams which are welded and spliced to form a "sun" shape. The upper arc-shaped support frame 4 and the lower arc-shaped support frame 5 are made of double-ply I-beams, which can ensure the structural strength of the primary support frame and reduce the weight of the primary support frame. Since the primary support frame is arc-shaped, the double-ply I-beams can meet the strength requirements. In addition, the top support frame 1, the step support frame 2 and the leg support frame 3 are made of two double-ply I-beams which are welded and spliced, which can improve the structural strength of the portal body and ensure the overall structural strength of the portal body by cooperating with the reinforcing plates 7.

[0035] By arranging the primary support frame with a positive hole arc shape inside the portal body, the upper arc-shaped support frame 4 and the lower arc-shaped support frame 5 of the primary support frame can form a stable internal support structure inside the portal body, which not only facilitates subsequent positive hole excavation construction, but also improves the structural strength of the portal body, so that the portal can better play a supporting role.

[0036] Preferably, the step support frame 2 includes a vertical end and a horizontal end, and the horizontal end is provided with an arc surface portion which cooperates with the upper arc-shaped support frame 4 at one end of the upper arc-shaped support frame 4. For example, the vertical end and the horizontal end can be fixed by welding, and the arc surface portion and the upper arc-shaped support frame 4 can also be fixed by welding. By arranging the arc surface portion which cooperates with the upper arc-shaped support frame 4, the structural strength of the connection between the step support frame 2 and the upper arc-shaped support frame 4 can be improved, and the stability of the connection can be ensured.

[0037] In actual application, the top support frame 1 can be welded and connected with the uppermost vertical end of the step support frame 2, and the leg support frame 3 can be welded and connected with the lowermost horizontal end of the step support frame 2, so that the portal body has good structural stability, and the step support frame 2 can play a good role in structural reinforcement and stress dispersion.

[0038] Preferably, the vertical end and the horizontal end are connected by a connecting plate 8, and the connecting plate 8 is arranged at intervals. Each connecting plate 8 is connected to the vertical end at one end and connected to the horizontal end at the other end. For example, the connecting plate 8 can be arranged at intervals of two, three, four or more, and each connecting plate 8 is welded and fixed to the vertical end at one end and welded and fixed to the horizontal end at the other end. By arranging multiple connecting plates 8 at intervals, the structural strength of the connection between the vertical end and the horizontal end can be improved.

[0039] Preferably, the step support frame 2 is provided with a shielding cover 6 for shielding the connection between the vertical end and the horizontal end, and the shielding cover 6 is detachably mounted on the step support frame 2. Exemplarily, the shielding cover 6 can be made of a wooden board, which is lighter in structure and lower in cost, and easy to assemble. In actual use, the shielding cover 6 can be fixed on the step support frame 2 by steel wire binding, and other ways of fixing the shielding cover 6 can also be selected by those skilled in the art according to actual needs, as long as the shielding cover 6 can be detachably mounted on the step support frame 2, which will not be described here. By providing the shielding cover 6, good protection effect can be achieved for the welding position of the vertical end and the horizontal end of the step support frame 2, so as to avoid that the welding points are covered when the concrete is sprayed in the later stage, and the goal of simple and easy removal of the concrete sprayed on the welding points, closer connection and more convenient welding can be achieved.

[0040] Preferably, the upper arc-shaped support 4 includes an upper arc-shaped segment 9 and lower support segments 10, two of which are provided at the left and right ends of the arc-shaped segment 9; the arc top of the arc-shaped segment 9 is connected with the top support frame 1, the step support frame 2 is connected with the arc surface of the arc-shaped segment 9, and the left and right ends of the arc-shaped segment 9 are respectively connected with two leg supports 3. Exemplarily, the upper arc-shaped support 4 can also adopt a multi-segment splicing structure, and the segments are connected by welding, so as to facilitate construction. By adopting the upper arc-shaped support 4 with the above structure, the upper arc-shaped support 4 can form a stable structure with the lower arc-shaped support 5, so as to realize the internal support of the portal body and facilitate subsequent excavation of the main hole.

[0041] Preferably, the support segments 10 are inclined, and one end of the support segment 10 is connected with the arc-shaped segment 9, and the other end forms an acute angle with the leg support 3. Exemplarily, the left and right ends of the lower arc-shaped support 5 are respectively welded with the leg support, and by inclining the support segment 10 inwardly to the portal body, when the lower end support segment 10 of the upper arc-shaped support 4 is stressed, the arc-shaped segment 9 can extrude the leg support 3 outwardly and conduct and disperse the stress, so as to improve the structural stability and reliability of the whole portal.

[0042] In actual application, by adopting the step-type portal for roof picking construction technology, the subsequent main hole arc-shaped primary support and the portal body are conveniently overlapped, the roof picking structure is more stable, and the subsequent main hole excavation is more simple and convenient, safe and reliable in quality.

[0043] The utility model discloses a step type portal for tunnel roof picking, has the advantages that the whole is good, and construction is flexible and convenient, through adopting roof support frame, step support frame, support leg frame carries out on -the -spot splicing, and the operation is simple, and step support frame is favorable to portal both sides excavation, and also can refer to the primary support frame contour in the portal body and excavate when excavating, can avoid two side edge position secondary excavation, reduces the disturbance of blasting to surrounding rock, is favorable to the stability of tunnel structure. By utilizing this portal, it is also favorable to reduce the excavation amount, and reduce the dosage of shotcrete and secondary lining concrete, avoid unnecessary material waste, reduce the security risk caused by the dead weight of concrete, simultaneously reduce the risk that the cavity exists behind the portal, guarantee the safety of intersection position. In addition, by setting up the shielding cover on the step support frame, the welding position can be protected, the post-period chiseling engineering quantity is reduced, and the quick construction is favorable.

[0044] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A stepped portal for tunnel jacking, characterized by: The gate frame body comprises a primary support frame arranged inside the gate frame body. The gate frame body comprises a top support frame (1) and a stepped support frame (2) arranged at the left and right ends of the top support frame (1), the stepped support frame (2) comprises at least two steps, the top of the stepped support frame (2) is connected with the top support frame (1), and the lower end of the stepped support frame (2) is provided with a support leg frame (3). The primary support frame comprises an upper arc-shaped support frame (4) and a lower arc-shaped support frame (5), the top of the upper arc-shaped support frame (4) is arranged towards the top support frame (1), and the opening of the lower arc-shaped support frame (5) is arranged towards the top support frame (1); the top support frame (1), the stepped support frame (2) and the support leg frame (3) are connected with the upper arc-shaped support frame (4), and the left and right ends of the lower arc-shaped support frame (5) are connected with the left and right ends of the upper arc-shaped support frame (4) respectively.

2. A step-type portal for tunnel jacking according to claim 1, characterized in that: The top support frame (1) and the stepped support frame (2) and the stepped support frame (2) and the support leg frame (3) are connected through a reinforcing plate (7).

3. A stepped portal for tunnel jacking according to claim 2, characterised in that: The reinforcing plate (7) is arranged at least in two intervals.

4. A stepped portal for tunnel jacking according to claim 3, characterised in that: The top support frame (1), the stepped support frame (2), the support leg frame (3), the upper arc-shaped support frame (4) and the lower arc-shaped support frame (5) are all made of double-spliced I-beams.

5. A stepped portal for tunnel jacking according to claim 4, characterised in that: The top support frame (1), the stepped support frame (2) and the support leg frame (3) are all made of two spliced double-spliced I-beams.

6. A step portal for tunnel jacking according to any one of claims 1-4, characterized in that: The stepped support frame (2) comprises a vertical end and a horizontal end, and the horizontal end is provided with an arc surface part matched with the upper arc-shaped support frame (4) at one end of the upper arc-shaped support frame (4).

7. A stepped portal for tunnel jacking according to claim 6, characterised in that: The vertical end and the horizontal end are connected through a connecting plate (8), and the connecting plate (8) is arranged at least in two intervals, one end of each connecting plate (8) is connected with the vertical end, and the other end is connected with the horizontal end.

8. A stepped portal for tunnel jacking according to claim 7, characterised in that: The stepped support frame (2) is provided with a shielding cover (6) for shielding the connection between the vertical end and the horizontal end, and the shielding cover (6) is detachably mounted on the stepped support frame (2).

9. A stepped portal for tunnel jacking according to claim 6, characterised in that: The upper arc-shaped support frame (4) comprises an upper arc-shaped section (9) and a lower support section (10), the support section (10) is provided with two at the left and right ends of the arc-shaped section (9), the top of the arc-shaped section (9) is connected with the top support frame (1), the stepped support frame (2) is connected with the arc surface of the arc-shaped section (9), and the left and right ends of the arc-shaped section (9) are connected with two support leg frames (3) respectively.

10. A step-type portal for tunnel jacking according to claim 9, characterized in that: The support section (10) is arranged obliquely, one end of the support section (10) is connected with the arc-shaped section (9), and the other end is connected with the support leg frame (3) at an acute angle.

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