A reusable prefabricated temporary support structure and its application method

Abstract

The present invention provides a reusable prefabricated temporary support structure, which includes a vertical support member and a U-shaped steel plate for supporting the steel arch frame in the tunnel. The vertical support member includes a first steel pipe, a steel sleeve, and a second steel pipe. One end of the first steel pipe is detachably connected to the U-shaped steel plate, and the other end of the first steel pipe extends into the steel sleeve and is detachably connected to the steel sleeve. One end of the second steel pipe extends into the steel sleeve and is detachably connected to the steel sleeve. A plurality of supports are provided at the other end of the second steel pipe and support on the bedrock of the tunnel floor. A plurality of reaction frames are provided at the bottom of the steel sleeve. The reaction frames are located directly above the supports, and the reaction frames correspond to the supports one by one. The vertical support member further includes a lifting member for jacking up the reaction frames, and the lifting member is placed on the supports. The present invention also provides an application method of the reusable prefabricated temporary support structure.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering support, and particularly to a reusable assembled temporary support structure and its application method. Background Art

[0002] With the rapid development of urban rail transit and the progress of tunnel construction technology, in recent years, more and more large-span tunnels have been put into construction. Most large-span tunnels adopt sectional excavation. Based on the mechanism of unloading and reducing the span, temporary supports are widely used. Existing temporary supports mostly use section steel, which has a long installation and removal time and cumbersome operation, affecting the time for the initial support to form a closed loop, and cannot be reused, resulting in waste of materials. Therefore, a reusable and easily installed assembled temporary support structure is needed. Summary of the Invention

[0003] The present invention provides a reusable assembled temporary support structure, aiming to provide an environmentally friendly, simple-structured, convenient-installed-and-removed, cost-reducing temporary support structure that can support in multiple directions, be assembled in modules, and be reused. The present invention solves at least some of the problems in the prior art.

[0004] The present invention is implemented as follows:

[0005] The present invention provides a reusable assembled temporary support structure, including a vertical support member and a U-shaped steel plate for supporting the steel arch frame in the tunnel arch. The vertical support member includes a first steel pipe, a steel sleeve, and a second steel pipe. One end of the first steel pipe is detachably connected to the U-shaped steel plate, and the other end of the first steel pipe extends into the steel sleeve and is detachably connected to the steel sleeve. One end of the second steel pipe extends into the steel sleeve and is detachably connected to the steel sleeve. The other end of the second steel pipe is provided with a plurality of supports that support on the tunnel floor bedrock. The bottom of the steel sleeve is provided with a plurality of reaction frames, and the reaction frames are located directly above the supports, and the reaction frames correspond to the supports one by one. The vertical support member further includes a hoisting member for jacking up the reaction frames, and the hoisting member is placed on the supports.

[0006] Further, the assembled temporary support structure further includes a steel plate. One end of the first steel pipe is welded to the steel plate, and the steel plate is bolted to the U-shaped steel plate.

[0007] Further, the upper end of the steel sleeve is reserved with holes for bolt-connecting the first steel pipe.

[0008] Further, the lower end of the steel sleeve is reserved with channels for bolt-connecting the second steel pipe.

[0009] Further, the contact surface between the support and the tunnel floor bedrock is serrated.

[0010] Furthermore, the lifting member is a jack.

[0011] Furthermore, the prefabricated temporary support structure further includes an inclined support member. The inclined support member includes a connecting buckle, two third steel pipes, and two fourth steel pipes. A plurality of convex rings are provided at intervals on the upper end of the steel sleeve. The connecting buckle is sleeved and fixed on the outer side of the convex ring. The connecting buckle includes two arc-shaped plates. One end of the two arc-shaped plates is hinged through an axle core. Both of the arc-shaped plates can rotate around the axle core. The other ends of the two arc-shaped plates are fixed by bolts. One end of the third steel pipe is rotatably connected to the arc-shaped plate. The third steel pipes correspond to the arc-shaped plates one by one. The other end of the third steel pipe extends into the fourth steel pipe and is detachably connected to the fourth steel pipe. A flat support seat for fixing to the surrounding rock of the two side walls of the tunnel is provided at the end of the fourth steel pipe away from the third steel pipe.

[0012] Furthermore, a steel plate with a round hole is provided on each of the two arc-shaped plates. Two connecting hole plates are provided at one end of the third steel pipe. The steel plate with a round hole extends between the two connecting hole plates. The steel plate with a round hole is connected to the two connecting hole plates by bolts, so that the third steel pipe is rotatably connected to the arc-shaped plate.

[0013] Furthermore, a reserved channel is provided on the fourth steel pipe for bolt connection of the third steel pipe.

[0014] The present invention also provides an application method of the reusable prefabricated temporary support structure, including the following steps:

[0015] S1. When the tunnel is excavated in sections, after the left section of the upper bench is excavated, measure the height of the pilot tunnel. Adjust the length of the vertical support member to the height corresponding to the pilot tunnel by sliding the first steel pipe and fix the first steel pipe with bolts;

[0016] S2. Install the steel rigid frame of the left section of the arch. Transport the vertical support member to the installation position. Erect the vertical support member by mechanical equipment or manually. Adjust the relative position of the second steel pipe and the steel sleeve through the lifting member, so that the U-shaped steel plate on the vertical support member is aligned with the end of the steel rigid frame of the left section of the arch. Weld the end of the steel rigid frame of the left section of the arch to the U-shaped steel plate. The support seat of the second steel pipe supports on the bedrock of the lower bench;

[0017] S3. After the right section of the upper bench is excavated, install the steel support of the right section of the arch. Weld the end of the steel support of the right section of the arch to the U-shaped steel plate;

[0018] S4. After the upper bench is completely excavated, fix the connecting buckle on the steel sleeve. At the same time, connect and adjust the lengths of the fourth steel pipe and the third steel pipe, so that the flat support seat of the fourth steel pipe is fixed to the surrounding rock of the two side walls to achieve the effect of inclined support;

[0019] S5. After the excavation of the left part of the lower bench is completed, construct the side wall steel support and the inverted arch steel support, remove the diagonal support members, and then adjust the relative positions of the first steel pipe and the second steel pipe through bolts and jacks so that the support of the second steel pipe is supported on the inverted arch bedrock;

[0020] S6. When removing the vertical support members, unscrew the bolts to release the connection between the U-shaped steel plate and the steel plate, rotate the bolts to retract the first steel pipe and the second steel pipe into the steel sleeve, complete the recovery of the vertical support members and transport them to the position where temporary support is needed for reuse.

[0021] The present invention has the following beneficial effects:

[0022] 1. For the reusable assembled temporary support structure described in the present invention, the U-shaped steel plate is used instead of the connecting plate to weld the arch steel support. Since the U-shaped steel plate and the temporary support are connected by bolts, only the bolts need to be unscrewed when removing the temporary support, which is simple and convenient.

[0023] 2. The reusable assembled temporary support structure described in the present invention can adjust the height of the temporary vertical and diagonal supports through the telescoping of the steel pipes, can be applied to tunnels of various cross-sections, and can achieve multi-directional support, with high flexibility and strong applicability.

[0024] 3. For the reusable assembled temporary support structure described in the present invention, since all components and joints of the support structure are prefabricated modules, the module assembly function can be realized. At the same time, when removing the temporary support after use, the support structure is not damaged, and it can be recycled, which is green and environmentally friendly and can effectively reduce project costs.

[0025] 4. For the reusable assembled temporary support structure described in the present invention, since the length can be adjusted, there is no need to separately construct the vertical support of the lower bench and weld it with the vertical support of the upper bench when excavating the lower bench of the tunnel by subsections. The invention can take into account the vertical supports of both the upper and lower benches at the same time, can effectively reduce the tunnel construction time, prompt the early closure of the initial support into a ring, and control the surrounding rock deformation and reduce settlement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is the overall schematic diagram of the temporary support provided by the embodiment of the present invention;

[0028] Figure 2 Schematic diagram of the splitting of the temporary vertical support provided by the embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the splitting of the temporary lateral bracing provided by the embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the connecting buckle provided by the embodiment of the present invention;

[0031] Figure 5 Detail drawing of the connection position between the vertical support and the lateral bracing provided by the embodiment of the present invention;

[0032] Figure 6 Detail drawing of the bottom end of the temporary support provided by the embodiment of the present invention;

[0033] Figure 7 Schematic diagram of Embodiment 1 provided by the embodiment of the present invention;

[0034] Figure 8 Schematic diagram of Embodiment 2 provided by the embodiment of the present invention;

[0035] Figure 9 Schematic diagram of Embodiment 3 provided by the embodiment of the present invention.

[0036] In the figure: 1-U-shaped steel plate, 2-steel plate, 3-first steel pipe, 4-second steel pipe, 5-steel sleeve, 6-bolt, 7-jack, 8-connecting buckle, 8-1-axis core, 9-third steel pipe, 10-fourth steel pipe. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present invention.

[0039] The terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, the meaning of "several" is two or more.

[0040] As Figures 1-9 , an embodiment of the present invention provides a reusable prefabricated temporary support structure, including a U-shaped steel plate 1, a steel plate 2, a first steel pipe 3, a second steel pipe 4, a steel sleeve 5, a bolt 6, a jack 7, a connection buckle 8, a shaft core 8-1, a third steel pipe 9, and a fourth steel pipe 10. The first steel pipe 3 is connected to the steel plate 2. The second steel pipe 4 has four supports. The steel sleeve 5 has four reaction frames. The third steel pipe 9 has two connecting orifice plates. The fourth steel pipe 10 has a flat support.

[0041] The U-shaped steel plate 1 is connected to the steel plate 2 by bolts; the steel plate 2 is welded to the first steel pipe 3; the inner diameter of the first steel pipe 3 is 18 - 22 cm, and the wall thickness is 2 - 4 cm; the inner diameter of the second steel pipe 4 is the same as that of the first steel pipe 3, the wall thickness is 2 - 4 cm, the length is not more than 1 m, and the contact surfaces of the four supports with the ground are serrated.

[0042] The inner diameter of the steel sleeve 5 is slightly larger than that of the first steel pipe 3 and the second steel pipe 4, and it can just be sleeved on the outer sides of the first steel pipe 3 and the second steel pipe 4. The wall thickness is 2 - 4 cm, and the length is 4 - 10 m. The specific length is determined according to the actual tunnel height; there are convex rings distributed at fixed distances up and down in the upper region of the steel sleeve 5. The distance between the four reaction frames at the bottom of the steel sleeve 5 corresponds to the four supports; the distance of the four reaction frames from the proximal end of the steel sleeve is about 5 - 10 cm.

[0043] Furthermore, the total length of the first steel pipe 3 and the second steel pipe 4 is similar to that of the steel sleeve 5.

[0044] Furthermore, the relative positions of the first steel pipe 3, the second steel pipe 4, the first steel pipe 3, the second steel pipe 4 and the steel sleeve 5 are fixed by bolts 6; a hole is reserved above the steel sleeve 5 for the bolt 6 to connect the first steel pipe 3; a channel is reserved at one end of the steel sleeve 5 near the reaction frame for the bolt 6 to connect the second steel pipe 4.

[0045] Furthermore, the connection buckle 8 is composed of two parts. These two parts can rotate around the shaft core 8-1 and can just be sleeved on the steel sleeve 5 with convex rings; after the connection buckle 8 is sleeved on the steel sleeve 5, it can be fixed by bolts 6. Symmetrically distributed steel plates with round holes are arranged on the outside of the connection buckle 8. The steel plates with round holes extend between the two connecting orifice plates of the third steel pipe 9. The steel plates with round holes are connected to the two connecting orifice plates by bolts 6, so that the third steel pipe 9 and the connection buckle 8 can be rotatably connected.

[0046] The connecting buckle 8 corresponds to the convex ring on the steel sleeve 5 and can be adjusted and fixed up and down; the third steel pipe 9 can rotate around the bolt 6 connected to the connecting buckle 8 to flexibly adjust the lateral support position.

[0047] Furthermore, the fourth steel pipe 10 is of a length comparable to that of the third steel pipe 9, and the two can slide relative to each other to adjust the support length. The fourth steel pipe 10 has a reserved channel for the bolt 6 to connect to the third steel pipe 9; the inner diameter of the third steel pipe 9 is 8 - 10 cm, and the wall thickness is 2 - 4 cm; the inner diameter of the fourth steel pipe 10 is slightly larger than that of the third steel pipe 9, and the wall thickness is 2 - 4 cm, and it can just fit over the third steel pipe 9.

[0048] Furthermore, a reusable prefabricated temporary support structure includes the following usage steps:

[0049] Step 1: When the tunnel is excavated in sections, taking the two - step CD method as an example, the tunnel section is divided into two layers and four parts. First, excavate the left part. After the excavation of the upper - step left part is completed, measure the height of the pilot tunnel, adjust the length of the temporary support to the corresponding height by sliding the first steel pipe 3 and fix it with the bolt 6.

[0050] Step 2: Install the steel section arch frame in the arch part of the left part. Transport the temporary support to the installation position, erect it by mechanical equipment or manually, and finely adjust the relative position of the second steel pipe 4 and the steel sleeve 5 through the jack 7 so that the U - shaped steel plate 1 on the temporary support is aligned with the end of the steel section arch frame in the arch part of the left part. Weld the end of the steel section arch frame in the arch part of the left part to the U - shaped steel plate 1 of the temporary support. The four supports of the second steel pipe 4 rest on the bedrock of the lower step.

[0051] Step 3: After the excavation of the upper - step right part is completed, install the steel section arch support in the arch part of the right part and weld the end of the steel section arch support in the arch part of the right part to the U - shaped steel plate 1 of the temporary support.

[0052] Step 4: After the excavation of the upper step is completed, fix the connecting buckle 8 on the steel sleeve 5, and at the same time connect and adjust the lengths of the fourth steel pipe 10 and the third steel pipe 9 so that the flat supports of the fourth steel pipe 10 are fixed to the surrounding rocks of the two side walls to achieve the effect of diagonal support.

[0053] Step 5: After the excavation of the lower - step left part is completed, install the side - wall and invert steel section supports, remove the diagonal supports on both sides of the temporary support, and then adjust the relative positions of the first steel pipe 3 and the second steel pipe 4 through the bolt 6 and the jack 7 so that the four supports of the second steel pipe 4 rest on the invert bedrock.

[0054] Step 6: When demolishing the temporary support, unscrew the bolt to release the connection between the U - shaped steel plate 1 and the steel plate 2, rotate the bolt 6 to retract the first steel pipe 3 and the second steel pipe 4 into the steel sleeve 5, complete the recovery of the temporary support and transport it to the position where temporary support is needed for reuse.

[0055] Furthermore, the vertical support members of the temporary support can be implemented separately. For specific details, refer to the schematic diagram of Embodiment 1.

[0056] Furthermore, the temporary supports are connected by the third steel pipes 9. The third steel pipes 9 can also be nested with each other and fixed by bolts, enabling adjustable length and flexibility. Eventually, the modular assembly function can be achieved. For specific details, refer to the schematic diagram of Embodiment 3.

[0057] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for applying a reusable prefabricated temporary support structure, characterized in that, The temporary support structure includes a vertical support member and a U-shaped steel plate (1) for supporting the steel arch in the tunnel. The vertical support member includes a first steel pipe (3), a steel sleeve (5), and a second steel pipe (4). One end of the first steel pipe (3) is detachably connected to the U-shaped steel plate (1), and the other end of the first steel pipe (3) extends into the steel sleeve (5) and is detachably connected to the steel sleeve (5). One end of the second steel pipe (4) extends into the steel sleeve (5) and is detachably connected to the steel sleeve (5). The other end of the second steel pipe (4) is provided with a number of supports that support on the bedrock of the tunnel floor. The bottom of the steel sleeve (5) is provided with a number of reaction frames. The reaction frames are located directly above the supports, and the reaction frames correspond to the supports one by one. The vertical support member further includes a lifting member for jacking up the reaction frames. The lifting member is placed on the supports, and the lifting member is a jack (7). The application method of the temporary support structure includes the following steps: S1. When the tunnel is excavated in sections, after the left section of the upper bench is excavated, measure the height of the pilot tunnel. Adjust the length of the vertical support member to the height corresponding to the pilot tunnel by sliding the first steel pipe (3) and fix the first steel pipe (3) with bolts (6). S2. Install the steel arch in the left section of the upper bench. Transport the vertical support member to the installation position and erect the vertical support member by mechanical equipment or manually. The vertical support member further includes a lifting member for jacking up the reaction frames. The lifting member is a jack (7). The lifting member is placed on the supports. Adjust the relative position of the second steel pipe (4) and the steel sleeve (5) by the lifting member so that the U-shaped steel plate (1) on the vertical support member is aligned with the end of the steel arch in the left section of the upper bench. Weld the end of the steel arch in the left section of the upper bench to the U-shaped steel plate (1). The support of the second steel pipe (4) supports on the bedrock of the lower bench. S3. After the right section of the upper bench is excavated, install the steel arch support in the right section of the upper bench and weld the end of the steel arch support in the right section of the upper bench to the U-shaped steel plate (1). S4. After the upper bench is completely excavated, install the diagonal support member. Fix the connecting buckle (8) on the steel sleeve (5). At the same time, connect and adjust the lengths of the fourth steel pipe (10) and the third steel pipe (9) so that the flat support of the fourth steel pipe (10) is fixed to the surrounding rocks on both side walls to achieve the effect of diagonal support. Among them, one end of the third steel pipe (9) is rotatably connected to the connecting buckle (8), the other end of the third steel pipe (9) extends into the fourth steel pipe (10) and is detachably connected to the fourth steel pipe (10), and the end of the fourth steel pipe (10) away from the third steel pipe (9) is provided with a flat support fixed to the surrounding rocks on both side walls of the tunnel. S5. After the left section of the lower bench is excavated, install the side wall steel support and the invert steel support. Remove the diagonal support member, and then adjust the relative positions of the first steel pipe (3) and the second steel pipe (4) by bolts (6) and the jack (7) so that the support of the second steel pipe (4) supports on the bedrock of the invert. S6. When removing the vertical support member, loosen the bolts to release the connection between the U-shaped steel plate (1) and the steel plate (2), and rotate the bolts (6) to retract the first steel pipe (3) and the second steel pipe (4) into the steel sleeve (5), completing the recovery of the vertical support member and transporting it to the position where temporary support is required for reuse.

2. The application method of the reusable prefabricated temporary support structure according to claim 1, characterized in that: It further includes a steel plate (2). One end of the first steel pipe (3) is welded to the steel plate (2), and the steel plate (2) is connected to the U-shaped steel plate (1) by bolts.

3. The application method of the reusable prefabricated temporary support structure according to claim 1, characterized in that: A hole is reserved at the upper end of the steel sleeve (5) for the bolt (6) to connect the first steel pipe (3).

4. The application method of the reusable prefabricated temporary support structure according to claim 1, characterized in that: A channel is reserved at the lower end of the steel sleeve (5) for the bolt (6) to connect the second steel pipe (4).

5. The application method of the reusable prefabricated temporary support structure according to claim 1, characterized in that: The contact surface between the support and the bedrock of the tunnel floor is serrated.

6. The application method of the reusable prefabricated temporary support structure according to claim 1, characterized in that: The upper end of the steel sleeve (5) is provided with a number of spaced convex rings. The connecting buckle (8) is sleeved and fixed on the outside of the convex rings. The connecting buckle (8) includes two arc-shaped plates. One end of the two arc-shaped plates is hinged by an axle core (8-1). The two arc-shaped plates can rotate around the axle core (8-1). The other end of the two arc-shaped plates is fixed by a bolt (6). One end of the third steel pipe (9) is rotatably connected to the arc-shaped plate. The third steel pipes (9) correspond to the arc-shaped plates one by one. The other end of the third steel pipe (9) extends into the fourth steel pipe (10) and is detachably connected to the fourth steel pipe (10). A flat support fixed to the surrounding rock of the two side walls of the tunnel is provided at the end of the fourth steel pipe (10) far from the third steel pipe (9).

7. The application method of the reusable prefabricated temporary support structure according to claim 6, characterized in that: A steel plate with a round hole is provided on each of the two arc-shaped plates. Two connecting hole plates are provided at one end of the third steel pipe (9). The steel plate with a round hole extends between the two connecting hole plates. The steel plate with a round hole is connected to the two connecting hole plates by bolts (6), so that the third steel pipe (9) is rotatably connected to the arc-shaped plate.

8. The application method of the reusable prefabricated temporary support structure according to claim 6, characterized in that: A channel is reserved on the fourth steel pipe (10) for the bolt (6) to connect the third steel pipe (9).

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