Temporary supporting steel frame for tunnel adopting partial excavation method

Abstract

The utility model belongs to the technical field of tunnel engineering, and discloses a temporary support steel frame for a tunnel by a partial excavation method, which comprises a main body annular steel frame and an auxiliary steel frame, a main support steel frame is detachably mounted on the outer wall of the main body annular steel frame, an auxiliary support steel frame is detachably mounted on the outer wall of the auxiliary steel frame, and the main support steel frame and the auxiliary support steel frame are detachably mounted on the outer wall of the main body annular steel frame. A protection mechanism is arranged on the outer wall of the main supporting steel frame, and a supporting mechanism is arranged on the outer wall of the bottom end of the main supporting steel frame. The supporting mechanism comprises a fixing plate, the outer wall of the bottom end of the fixing plate is fixedly connected with a fixing block, and the inner wall of the fixing block is elastically connected with a moving rod through a connecting spring. According to the utility model, the joints of the main support steel frame and the auxiliary support steel frame and the main body annular steel frame and the auxiliary steel frame can be protected, the problem of difficulty in disassembly is avoided during later disassembly, damage is avoided during disassembly, the problem that a temporary support cannot be recycled is avoided, and the replacement cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel engineering, and particularly relates to a temporary support steel frame for a tunnel using the partial excavation method. Background Technique

[0002] Under the condition of soft surrounding rock, during the construction of a mined tunnel, the tunnel section needs to be gradually excavated and formed by dividing it into partial pilot tunnels. The role of the pilot tunnel is to provide space and support for the main excavation of the tunnel, so as to ensure the overall stability while avoiding large-scale excavation. In addition, permanent support and temporary support need to be installed during the partial excavation of the tunnel. The permanent support can provide long-term structural stability after the tunnel construction is completed, while the temporary support is a structure that supports the permanent support to ensure the stability of the support structure during the excavation process.

[0003] In some existing technologies, due to the large span at both ends of the permanent support, the general axial force of the temporary support may not achieve a good support effect, which may cause the permanent support to sink or tilt, and even cause changes in the geometric shape of the tunnel structure, affecting the stability. Moreover, when installing the temporary support, both sides need to be bolted to the permanent support. To improve the connection strength, the connection points need to be covered with shotcrete. However, when the temporary support needs to be removed, the connection points on both sides are covered with concrete, making it difficult to remove it completely. Mechanical breaking of the concrete will damage the steel frame structure of the temporary support, resulting in the temporary support being disposable and unable to be recycled, with a high cost, and the troublesome removal will reduce the work efficiency. Therefore, a temporary support steel frame for a tunnel using the partial excavation method is proposed to solve the above problems. Content of the Utility Model

[0004] To solve the problems raised in the above background technique, the utility model provides a temporary support steel frame for a tunnel using the partial excavation method.

[0005] To achieve the above object, the utility model provides the following technical solution: A temporary support steel frame for a tunnel using the partial excavation method, including a main circumferential steel frame and a secondary steel frame. The outer wall of the main circumferential steel frame is detachably installed with a main support steel frame, the outer wall of the secondary steel frame is detachably installed with a secondary support steel frame, a protection mechanism is arranged on the outer wall of the main support steel frame, and a support mechanism is arranged on the outer wall at the bottom of the main support steel frame;

[0006] The support mechanism includes a fixing plate. A fixing block is fixedly connected to the outer wall at the bottom of the fixing plate. A moving rod is elastically connected to the inner wall of the fixing block through a connecting spring. A clamping block is fixedly connected to the outer wall of the moving rod. A support rod is rotatably connected to the inner wall of the fixing block. A clamping groove is opened in the inner wall of the support rod. An empty groove is opened in the inner wall of the support rod. An installation plate is hinged to the outer wall at the bottom of the support rod. Axial force sensing monitors are fixedly connected to the outer walls at the bottoms of the main support steel frame and the secondary support steel frame.

[0007] Preferably, the fixing plate is fixedly connected to the outer wall of the bottom end of the main support steel frame, the moving rod is slidably connected to the inner wall of the fixing block, and a wedge-shaped abutting block is arranged on the inner wall of the top end of the auxiliary support steel frame.

[0008] Preferably, one end of the connecting spring is fixedly connected to the inner wall of the fixing block, and the other end of the connecting spring is fixedly connected to the outer wall of the moving rod.

[0009] Preferably, the clamping block is clamped with the clamping groove, and the mounting plate is fixedly connected to the outer wall of the main body circumferential steel frame through bolts.

[0010] Preferably, the protection mechanism includes a protective cover, a connecting plate is fixedly connected to the outer wall of the protective cover, a convex block is fixedly connected to the outer wall of the top end of the main support steel frame, two wedge blocks are slidably connected to the inner wall of the convex block, and the two wedge blocks are elastically connected by a return spring.

[0011] Preferably, the protective cover is in contact with the outer wall of the main body circumferential steel frame, and the connecting plate is in contact with the outer wall of the main support steel frame.

[0012] Preferably, both ends of the return spring are fixedly connected to the outer walls of the two wedge blocks respectively, and the convex block is inserted into the connecting plate.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The present utility model can improve the stability of the main support steel frame and the auxiliary support steel frame through the support mechanism, and the wedge-shaped abutting block can improve the support strength of the main support steel frame and the auxiliary support steel frame for the main body annular steel frame and the auxiliary steel frame, avoiding deformation of the main body annular steel frame and the auxiliary steel frame. By spraying concrete outside the protective cover, the joints of the main support steel frame, the auxiliary support steel frame, the main body annular steel frame and the auxiliary steel frame can be protected. When disassembling in the later stage, the concrete is broken and the protective cover is cut off, and then the joints can be exposed for disassembly, which will not cause the problem that the concrete directly covers the joints and is difficult to disassemble, and will not damage the main support steel frame and the auxiliary support steel frame during disassembly, avoiding the problem that the temporary support cannot be recycled, and reducing the replacement cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the main structure of the present utility model;

[0016] Figure 2 is a front view schematic diagram of the main structure of the present utility model;

[0017] Figure 3 is a schematic diagram of the structures of the main support steel frame, the auxiliary support steel frame, the support mechanism and the protection mechanism of the present utility model;

[0018] Figure 4Schematic diagram of the disassembled structure of the protection mechanism, main support steel frame, and secondary support steel frame of the present utility model;

[0019] Figure 5 Schematic diagram of the disassembled structure of the cross-section of the fixing block and the cross-section of the support rod of the present utility model;

[0020] Figure 6 For the present utility model Figure 4 Enlarged structure diagram of part A in;

[0021] Figure 7 Schematic diagram of the cross-section of the main support steel frame, secondary support steel frame, and wedge-shaped abutting block of the present utility model.

[0022] In the figure: 1, main body circumferential steel frame; 2, secondary steel frame; 3, main support steel frame; 4, support mechanism; 401, fixing plate; 402, fixing block; 403, connecting spring; 404, moving rod; 405, clamping block; 406, support rod; 407, card slot; 408, empty slot; 409, mounting plate; 5, protection mechanism; 501, protective cover; 502, connecting plate; 503, convex block; 504, reset spring; 505, wedge block; 6, secondary support steel frame; 7, axial force sensing monitor; 8, wedge-shaped abutting block. Specific implementation manners

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0024] As Figures 1 to 7 shown, the present utility model provides a temporary support steel frame for a tunnel using the partial excavation method, including a main body circumferential steel frame 1 and a secondary steel frame 2. The outer wall of the main body circumferential steel frame 1 is detachably installed with a main support steel frame 3, the outer wall of the secondary steel frame 2 is detachably installed with a secondary support steel frame 6, the outer wall of the main support steel frame 3 is provided with a protection mechanism 5, the bottom outer wall of the main support steel frame 3 is provided with a support mechanism 4, the support mechanism 4 includes a fixing plate 401, the bottom outer wall of the fixing plate 401 is fixedly connected with a fixing block 402, the inner wall of the fixing block 402 is elastically connected with a moving rod 404 through a connecting spring 403, the outer wall of the moving rod 404 is fixedly connected with a clamping block 405, the inner wall of the fixing block 402 is rotatably connected with a support rod 406, the inner wall of the support rod 406 is provided with a card slot 407, the inner wall of the support rod 406 is provided with an empty slot 408, the bottom outer wall of the support rod 406 is hinged with a mounting plate 409, and axial force sensing monitors 7 are fixedly connected to the bottom outer walls of the main support steel frame 3 and the secondary support steel frame 6.

[0025] Adopting the above solution: When the mined - out tunnel is constructed by the partial - excavation method, the main circumferential steel frame 1 and the secondary steel frame 2 are its main supporting structures, and both are made of welded I - steel. The main supporting steel frame 3 and the secondary supporting steel frame 6 are temporary supports. On the opposite sides of the main circumferential steel frame 1, the secondary steel frame 2, the main supporting steel frame 3, and the secondary supporting steel frame 6, steel plates are welded. As Figure 1 、 Figure 2 shown, the main supporting steel frame 3 and the secondary supporting steel frame 6 are respectively fixed on the steel plates on the outer walls of the main circumferential steel frame 1 and the secondary steel frame 2 by bolts, playing a supporting role. The steel plates on the outer walls of the main circumferential steel frame 1 and the secondary steel frame 2 are relatively thick. When the bolts are tightened into the steel plates, they will not contact the surfaces of the main circumferential steel frame 1 and the secondary steel frame 2. That is, only threaded holes need to be opened on the steel plates to install the main supporting steel frame 3 and the secondary supporting steel frame 6, without the need to open threaded holes on the main circumferential steel frame 1 and the secondary steel frame 2, thus not affecting the main body of the supporting structure. The above - mentioned structures are all prior arts and are all made of steel.

[0026] As Figures 1 to 3 shown, the main supporting steel frame 3 is slidably connected to the inner wall of the secondary supporting steel frame 6, and the combined length of the two can be adjusted to ensure that the temporary support meets different length requirements. The two ends of the main supporting steel frame 3 and the secondary supporting steel frame 6 are respectively fixed on the steel plates on the outer walls of the main circumferential steel frame 1 and the secondary steel frame 2. On the steel plates on the outer walls of the main supporting steel frame 3 and the secondary supporting steel frame 6, a protection mechanism 5 is provided. The protection mechanism 5 can protect the connection points between the two and the steel plates on the outer walls of the main circumferential steel frame 1 and the secondary steel frame 2. When it is necessary to spray - mix and cover to improve the strength of the connection, the spray - mix can be applied to the outside of the protection mechanism 5, so that it will not affect the bolts at the connection after solidification; on the outer walls at the bottom ends of the main supporting steel frame 3 and the secondary supporting steel frame 6, a support mechanism 4 is provided, which can support the two and improve the strength of their temporary support. The other end of the support mechanism 4 is fixed on the steel plates on the outer walls of the main circumferential steel frame 1 and the secondary steel frame 2 by bolts; the axial - force sensing monitor 7 is a prior art. One group is installed below the connection between the secondary supporting steel frame 6 and the main supporting steel frame 3, and the other group is installed below the connection between the secondary steel frame 2 and the secondary supporting steel frame 6, which can determine whether the axial force of the temporary support can play a supporting role, and can also give an alarm when the monitored axial force exceeds the allowable limit value, enabling the operator to discover it in time.

[0027] As Figure 3 and Figure 4As shown in the figure, the fixed plate 401 is fixedly connected to the outer wall of the bottom end of the main support steel frame 3. The moving rod 404 is slidably connected to the inner wall of the fixed block 402. A wedge-shaped abutting block 8 is arranged on the inner wall of the top end of the auxiliary support steel frame 6. One end of the connecting spring 403 is fixedly connected to the inner wall of the fixed block 402, and the other end of the connecting spring 403 is fixedly connected to the outer wall of the moving rod 404. The clamping block 405 is clamped with the clamping groove 407. The mounting plate 409 is fixedly connected to the outer wall of the main body circumferential steel frame 1 by bolts.

[0028] Adopting the above scheme: As Figure 7 shown in the figure, when both ends of the main support steel frame 3 and the auxiliary support steel frame 6 are fixedly completed, the combined length between them is fixed. There is an opening at the top end of the auxiliary support steel frame 6, and the main support steel frame 3 can only move horizontally in the inner wall of the auxiliary support steel frame 6. Since the tunnel will generate inward stress on the main body circumferential steel frame 1 and the auxiliary steel frame 2, causing the two to squeeze the main support steel frame 3 and the auxiliary support steel frame 6, after both ends of the main support steel frame 3 and the auxiliary support steel frame 6 are fixedly completed, the operator can use a jack or other means to select a suitable wedge-shaped abutting block 8 and insert it into the space between the main support steel frame 3 and the auxiliary support steel frame 6 from the opening at the top end of the auxiliary support steel frame 6. The three straight surfaces of the wedge-shaped abutting block 8 are adapted to the inner wall of the auxiliary support steel frame 6, while the inclined surface contacts the outer wall of the main support steel frame 3. After the wedge-shaped abutting block 8 is inserted into the space between the main support steel frame 3 and the auxiliary support steel frame 6, when the main body circumferential steel frame 1 and the auxiliary steel frame 2 squeeze the main support steel frame 3 and the auxiliary support steel frame 6 due to stress, the main support steel frame 3 will not move inward into the auxiliary support steel frame 6 due to the blocking force of the wedge-shaped abutting block 8, thus providing a good supporting force for the main body circumferential steel frame 1 and the auxiliary steel frame 2, improving the supporting strength, and preventing the two from deforming due to tunnel stress. Moreover, the wedge-shaped abutting block 8 is not restricted by the distance between the main support steel frame 3 and the auxiliary support steel frame 6. According to the different distances between the main body circumferential steel frame 1 and the auxiliary steel frame 2, the distance between the main support steel frame 3 and the auxiliary support steel frame 6 is also different. The operator can select a wedge-shaped abutting block 8 of a suitable size for adaptation, so as to provide support at any distance, which is more flexible.

[0029] After the main support steel frame 3 and the secondary support steel frame 6 are welded and fixed, the support rod 406 can be flipped and fixed to the steel plates on the outer walls of the main circumferential steel frame 1 and the secondary steel frame 2 by bolts, so as to support the main support steel frame 3 and the secondary support steel frame 6; the moving rod 404 can only move horizontally inside the inner wall of the fixed block 402. Without being affected by external forces, the connecting spring 403 keeps the latch 405 on the moving rod 404 in a state of being clamped with a set of clamping grooves 407 due to its own elastic force. There are multiple sets of clamping grooves 407, which are evenly distributed in a circumferential manner at equal angles on the inner wall of the support rod 406. The clamping grooves 407 are communicated with the empty grooves 408. By pressing the moving rod 404 to make it move horizontally and squeezing the connecting spring 403 to make it contract, the latch 405 can be moved from the inner wall of the clamping groove 407 to the inner wall of the empty groove 408, and the limit of the support rod 406 can be released to flip it; when the mounting plate 409 contacts the steel plate on the outer wall of the main circumferential steel frame 1 or the secondary steel frame 2, the mounting plate 409 can be fixed to the steel plate on the outer wall of the main circumferential steel frame 1 or the secondary steel frame 2 by bolts, so as to complete the adjustment and support of the support mechanism 4, improve the axial force of the main support steel frame 3 and the secondary support steel frame 6, ensure its strength, and there is no need to drill bolt holes on the main circumferential steel frame 1 or the secondary steel frame 2, which will not affect the two.

[0030] As Figure 4 and Figure 6 shown, the protection mechanism 5 includes a protective cover 501. A connecting plate 502 is fixedly connected to the outer wall of the protective cover 501. A convex block 503 is fixedly connected to the outer wall of the top end of the main support steel frame 3. Two wedge blocks 505 are slidably connected to the inner wall of the convex block 503. The two wedge blocks 505 are elastically connected by a return spring 504; the protective cover 501 contacts the outer wall of the main circumferential steel frame 1, and the connecting plate 502 contacts the outer wall of the main support steel frame 3; the two ends of the return spring 504 are respectively fixedly connected to the outer walls of the two wedge blocks 505, and the convex block 503 is inserted into the connecting plate 502.

[0031] The above scheme is adopted: the protective cover 501 and the connecting plate 502 are both made of plastic, which has low cost and can be cut according to actual needs; the protective cover 501 can be fixed to the steel plate of the outer wall of the main annular steel frame 1 or the auxiliary steel frame 2 by bolts, and the connecting plate 502 in the protective mechanism 5 can be fixed to the outer wall of the main support steel frame 3 or the auxiliary support steel frame 6. When installing the protective cover 501, the circular through groove of the connecting plate 502 can be aligned with the position of the protrusion 503, and the connecting plate 502 can be moved downward to insert the protrusion 503 into the circular through groove. The inner wall of the circular through groove squeezes the arc surface of the wedge block 505, so that the two groups of wedge blocks 505 are forced to move toward the middle at the same time, and the protective cover 501 is installed. The positioning spring 504 contracts under force, and when the connecting plate 502 moves to contact the outer wall of the main supporting steel frame 3 or the auxiliary supporting steel frame 6, the wedge block 505 pops out to both sides due to the elastic force of the reset spring 504, and the straight surface of the wedge block 505 contacts the top outer wall of the connecting plate 502, so that the connecting plate 502 can be limited and fixed on the outer wall of the main supporting steel frame 3 or the auxiliary supporting steel frame 6; then the protective cover 501 can be fixed to the steel plate of the outer wall of the main annular steel frame 1 or the auxiliary steel frame 2 by bolts, and the installation of the protective mechanism 5 can be completed. After the installation is completed, the connection between the protective cover 501 and the main supporting steel frame 3 or the auxiliary supporting steel frame 6 can be sprayed and covered to improve the strength of the connection.

[0032] When it is necessary to remove the protection mechanism 5, the concrete outside the protection cover 501 can be broken. Since the protection mechanism 5 is a disposable structure, even if the protection cover 501 is damaged during cutting and breaking, it will not affect the main support steel frame 3 or the auxiliary support steel frame 6. The protection cover 501 can be directly replaced after being damaged. By pressing the two sets of wedge blocks 505 to make them disengage from the connecting plate 502, the protection cover 501 and the connecting plate 502 can be removed from the main support steel frame 3 or the auxiliary support steel frame 6. There is no need to spray and cover the connection between the main support steel frame 3, the auxiliary support steel frame 6 and the main annular steel frame 1, the auxiliary steel frame 2. When disassembling and breaking the concrete, the main annular steel frame 1 and the auxiliary steel frame 2 will not be cut and damaged, thereby ensuring the integrity of the main support steel frame 3 and the auxiliary support steel frame 6. They can be recycled again after disassembly, reducing the replacement cost.

[0033] The working principle and use process of this utility model:

[0034] When the dark-digging tunnel is constructed by the partial excavation method, the main annular steel frame 1 and the auxiliary steel frame 2 serve as the main supporting structures. Steel plates are welded on one side of the two relative to the main supporting steel frame 3 and the auxiliary supporting steel frame 6. The main supporting steel frame 3 and the auxiliary supporting steel frame 6 are respectively fixed to the steel plates on the outer walls of the main annular steel frame 1 and the auxiliary steel frame 2 by bolts, playing a role of temporary support. The main supporting steel frame 3 is slidably connected to the inner wall of the auxiliary supporting steel frame 6. The combined length of the two can be adjusted according to the spacing between the main annular steel frame 1 and the auxiliary steel frame 2 to meet different length requirements.

[0035] During construction, the positions of the main circumferential steel frame 1 and the auxiliary steel frame 2 are in a fixed state, and the steel plates have been welded. Therefore, according to the distance between the main circumferential steel frame 1 and the auxiliary steel frame 2, the main supporting steel frame 3 and the auxiliary supporting steel frame 6 can be pulled to adjust their combined length, so that the two ends of the main supporting steel frame 3 and the auxiliary supporting steel frame 6 can respectively contact the steel plates on the outer walls of the main circumferential steel frame 1 and the auxiliary steel frame 2. The main supporting steel frame 3 and the auxiliary supporting steel frame 6 can be installed on the steel plates on the outer walls of the main circumferential steel frame 1 and the auxiliary steel frame 2 through bolts. Then, a wedge-shaped abutting block 8 of a suitable size is selected, so that its three straight faces are adapted to the inner wall of the auxiliary supporting steel frame 6, and the inclined face corresponds to the outer wall of the main supporting steel frame 3. Through a jack or other existing technologies, the wedge-shaped abutting block 8 is inserted between the main supporting steel frame 3 and the auxiliary supporting steel frame 6 from the top opening of the auxiliary supporting steel frame 6. In this state, the stress generated by the tunnel on the main circular steel frame 1 and the auxiliary steel frame 2 is transmitted to the main supporting steel frame 3 and the auxiliary supporting steel frame 6, and the two are blocked by the wedge-shaped abutting block 8, so that the two will not move inward, thereby improving the overall strength of the main circular steel frame 1 and the auxiliary steel frame 2 and reducing the influence of the tunnel stress on the two; and according to the distance between the main circular steel frame 1 and the auxiliary steel frame 2, after adjusting the distance between the main supporting steel frame 3 and the auxiliary supporting steel frame 6, by replacing wedge-shaped abutting blocks 8 of different sizes, support can be carried out at any distance between the two, and the adaptability is relatively high; after the main supporting steel frame 3 and the auxiliary supporting steel frame 6 are installed, the circular through groove of the connecting plate 502 can be made to correspond to the convex block 503 on the outer wall of the top of the main supporting steel frame 3, and then the connecting plate 502 is moved downward so that the convex block 503 is inserted into the circular through groove; when the connecting plate 502 moves to contact the outer wall of the main supporting steel frame 3 or the auxiliary supporting steel frame 6, the wedge block 505 pops out to both sides due to the elastic force of the return spring 504, and the straight face of the wedge block 505 contacts the top outer wall of the connecting plate 502 to limit the connecting plate 502 and fix it on the outer wall of the main supporting steel frame 3 or the auxiliary supporting steel frame 6.

[0036] Then, the protective cover 501 is fixed to the steel plate of the outer wall of the main annular steel frame 1 or the auxiliary steel frame 2 by bolts to complete the installation of the protective mechanism 5. After the installation is completed, the connection between the protective cover 501 and the main support steel frame 3 or the auxiliary support steel frame 6 can be sprayed and covered to improve the strength of the connection; then, by pressing the moving rod 404 to move it laterally, squeezing the connecting spring 403 to shrink it, the block 405 moves from the inner wall of the slot 407 to the inner wall of the empty slot 408, releasing the limit of the support rod 406, and the support rod 406 is moved. Flip the mounting plate 409 until it contacts the steel plate on the outer wall of the main annular steel frame 1 or the auxiliary steel frame 2, and fix the mounting plate 409 to the steel plate by bolts, thereby completing the adjustment support of the support mechanism 4, increasing the axial force of the main support steel frame 3 and the auxiliary support steel frame 6, and ensuring the strength of the support, and completing the installation of the temporary support. The axial force sensing monitor 7 below can monitor the axial force of the temporary support in real time, and issue an alarm when the monitored axial force exceeds the allowable limit, so that the operator can find the problem in time and take corresponding measures.

[0037] When it is necessary to dismantle the temporary support, the bolts of the mounting plate 409 are unscrewed, and then the concrete outside the protective cover 501 is broken. Since the protective mechanism 5 is a disposable structure, even if the protective cover 501 is damaged during cutting and breaking, it will not affect the main support steel frame 3 or the auxiliary support steel frame 6. The protective cover 501 can be directly replaced after being damaged. After the concrete is broken, the two sets of wedge blocks 505 are pressed to make them disengage from the connecting plate 502, and the protective cover 501 and the connecting plate 502 can be removed from the main support steel frame 3 or the auxiliary support steel frame 6. Under the protection of the protective cover 501, there is no need to spray and cover the connection between the main support steel frame 3, the auxiliary support steel frame 6 and the main annular steel frame 1 and the auxiliary steel frame 2, which ensures the integrity of the main support steel frame 3 and the auxiliary support steel frame 6. They can be recycled after disassembly, which reduces the replacement cost. At the same time, the disassembly and installation process is more convenient, which improves the overall efficiency.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A temporary support steel frame for a tunnel using a partial excavation method, comprising a main annular steel frame (1) and an auxiliary steel frame (2), characterized in that: The outer wall of the main annular steel frame (1) is detachably mounted with a main support steel frame (3), the outer wall of the auxiliary steel frame (2) is detachably mounted with an auxiliary support steel frame (6), the outer wall of the main support steel frame (3) is provided with a protection mechanism (5), and the outer wall of the bottom end of the main support steel frame (3) is provided with a support mechanism (4); The support mechanism (4) comprises a fixed plate (401), the bottom outer wall of the fixed plate (401) is fixedly connected to a fixed block (402), the inner wall of the fixed block (402) is elastically connected to a moving rod (404) via a connecting spring (403), the outer wall of the moving rod (404) is fixedly connected to a clamping block (405), the inner wall of the fixed block (402) is rotatably connected to a support rod (406), the inner wall of the support rod (406) is provided with a clamping groove (407), the inner wall of the support rod (406) is provided with an empty groove (408), the bottom outer wall of the support rod (406) is hinged with a mounting plate (409), and the bottom outer walls of the main support steel frame (3) and the auxiliary support steel frame (6) are both fixedly connected to an axial force sensing monitor (7).

2. A temporary support steel frame for a tunnel using a partial excavation method according to claim 1, characterized in that: The fixing plate (401) is fixedly connected to the outer wall of the bottom end of the main supporting steel frame (3), the moving rod (404) is slidably connected to the inner wall of the fixing block (402), and the top inner wall of the secondary supporting steel frame (6) is provided with a wedge-shaped abutment block (8).

3. A temporary support steel frame for a tunnel using a partial excavation method according to claim 1, characterized in that: One end of the connecting spring (403) is fixedly connected to the inner wall of the fixing block (402), and the other end of the connecting spring (403) is fixedly connected to the outer wall of the moving rod (404).

4. A temporary support steel frame for a tunnel using a partial excavation method according to claim 1, characterized in that: The clamping block (405) is clamped with the clamping groove (407), and the mounting plate (409) is fixedly connected to the outer wall of the main annular steel frame (1) by means of bolts.

5. The temporary support steel frame for a tunnel using a partial excavation method according to claim 1, characterized in that: The protection mechanism (5) comprises a protection cover (501), the outer wall of the protection cover (501) is fixedly connected with a connecting plate (502), the top outer wall of the main support steel frame (3) is fixedly connected with a protrusion (503), the inner wall of the protrusion (503) is slidably connected with two groups of wedge blocks (505), and the two groups of wedge blocks (505) are elastically connected via a return spring (504).

6. A temporary support steel frame for a tunnel using a partial excavation method according to claim 5, characterized in that: The protective cover (501) contacts the outer wall of the main annular steel frame (1), and the connecting plate (502) contacts the outer wall of the main supporting steel frame (3).

7. A temporary support steel frame for a tunnel using a partial excavation method according to claim 5, characterized in that: The two ends of the return spring (504) are respectively fixedly connected to the outer walls of the two groups of wedge blocks (505), and the protrusion (503) is plugged into the connecting plate (502).

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