Temporary supporting structure for replacement and replacement of arch crown lining of highway tunnel

Abstract

The utility model relates to the technical field of highway engineering, discloses a temporary supporting structure for replacement and replacement of a highway tunnel vault lining, and aims to solve the problems of lining deformation control and secondary lining side wall instability damage in the tunnel arch replacement and reinforcement process. The multiple sets of temporary supporting structures for road tunnel vault lining replacement are arranged at the top of backfill hole slag of an arch lining replacement section at equal intervals. Each group comprises a transverse temporary support, a longitudinal connecting rod and a feet-lock anchor pipe, the transverse temporary supports directly abut against the linings on the two sides of the haunch and are fixed through the feet-lock anchor pipes which are arranged in an inclined mode, and firm transverse support is provided; the longitudinal connecting rods connect the adjacent transverse I-shaped steel into a whole, and the overall stability is enhanced. The temporary supporting structure cooperates with backfill hole slag to form a temporary inverted arch, stress distribution is optimized, lining deformation is effectively controlled, and inward instability of a secondary lining side wall is prevented; the device is convenient to install, high in adaptability and capable of being widely applied to tunnel engineering with different section shapes and geological conditions; and the safety and efficiency of arch replacement construction can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of highway engineering technology, and in particular to a temporary support structure for replacing the arch lining of a highway tunnel. Background Technology

[0002] With the rapid development of my country's transportation infrastructure construction, the scale of highway tunnel construction has been continuously expanding, and the total operating mileage has been steadily increasing. At the same time, the issues of tunnel maintenance and renovation have become increasingly prominent. Due to various factors such as design flaws, construction quality, material properties, and geological conditions, many existing or under-construction tunnels suffer from varying degrees of damage, with cracking of the arch lining being particularly prominent. Some tunnel arch linings have developed severe cracks, spalling, and even the risk of collapse, posing a serious threat to the safe operation and structural stability of the tunnels.

[0003] To address such issues, the common approach for repair and reinforcement is to remove and rebuild the arch lining, a process known as arch replacement. However, tunnel arch replacement involves several complex steps, including surrounding rock reinforcement, the installation of temporary protective measures, the removal of the old arch, and the installation of the new arch. Effectively controlling lining deformation and preventing inward instability and damage to the secondary lining sidewalls due to arch lining replacement is crucial for ensuring construction safety and the long-term stability of the tunnel.

[0004] The current technical challenge lies in the lack of a temporary support structure that can reasonably support and effectively control lining deformation during tunnel arch replacement construction. This not only affects the safety and efficiency of construction but may also pose long-term risks to the overall structural stability of the tunnel. Therefore, it is urgent to design a temporary support structure suitable for the replacement of the arch lining in highway tunnels to solve the above-mentioned technical problems and ensure the smooth progress of arch replacement construction and the safety of the tunnel structure. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a temporary support structure for the replacement of the arch lining of a highway tunnel. The purpose is to control the deformation of the lining during the arch replacement construction process, prevent the secondary lining sidewalls from becoming unstable and damaged inward, and thus ensure the smooth progress of the entire construction process and the long-term stability of the tunnel structure.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A temporary support structure for the replacement of the arch lining of a highway tunnel, wherein several sets of such temporary support structures are equally spaced and arranged on top of the backfill slag in the section where the arch lining of the highway tunnel is replaced.

[0008] Each set of temporary support structures for the replacement of the arch lining of the highway tunnel includes several transverse temporary supports, longitudinal connecting rods, and anchor pipes; several transverse temporary supports are set at equal intervals horizontally, and adjacent transverse temporary supports are connected and fixed by several longitudinal connecting rods; both ends of each transverse temporary support extend to the lining structure of the highway tunnel and are fixed by anchor pipes that penetrate the tunnel lining structure and are driven into the surrounding rock.

[0009] Furthermore, the lateral temporary support is a straight I-beam or an I-beam with a certain downward curvature.

[0010] Furthermore, the longitudinal connecting rods are arranged laterally staggered among several transverse temporary supports, and the two ends of each longitudinal connecting rod are welded and fixed to the two adjacent transverse temporary supports.

[0011] Furthermore, rectangular steel plates are welded and fixed at both ends of the transverse temporary support, and through holes through which the locking foot anchor pipes can pass are symmetrically provided on the steel plates.

[0012] Furthermore, the anchor pipe is a grouting pipe, which is set at an angle of 30 to 45 degrees relative to the horizontal line. One end of the anchor pipe passes through the through hole in the steel plate and is welded and fixed to the steel plate. The other end penetrates the tunnel lining structure and is driven into the surrounding rock and then grouted and fixed.

[0013] The beneficial effects of this utility model are:

[0014] 1. Provides stable support and ensures construction safety: This temporary support structure, through the synergistic effect of transverse temporary supports, longitudinal connecting rods, and anchor pipes, forms a highly integrated and stable support system. During the replacement of the arch lining in highway tunnels, it can effectively control tunnel lining deformation, prevent rock instability or inward damage to the secondary lining sidewalls caused by the removal of the old arch, thereby significantly improving construction safety.

[0015] 2. Forming a temporary invert arch to optimize stress distribution: This temporary support structure works in conjunction with the backfill muck to form a temporary invert arch during the replacement of the arch lining, thus optimizing the stress distribution of the tunnel structure. This design not only effectively distributes the load on the arch but also avoids structural instability caused by local stress concentration, ensuring the overall stability of the tunnel during construction.

[0016] 3. Preventing instability of the secondary lining sidewalls and protecting the existing structure: During the replacement of the arch lining, the secondary lining sidewalls are prone to inward instability and failure due to the loss of upper support. This temporary support structure, through robust lateral and longitudinal connections combined with the anchoring effect of the anchor pipes, provides reliable lateral restraint, effectively preventing instability of the secondary lining sidewalls and protecting the safety of the existing tunnel structure.

[0017] 4. Enhanced construction efficiency and shortened construction period: The temporary support structure is reasonably designed and easy to install, and can be deployed and put into use in a short period of time; its efficient and stable support performance reduces potential safety hazards and rework risks during construction, thereby improving construction efficiency and shortening the overall construction period of arch replacement and reinforcement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the installation location of the temporary support structure for replacing the arch lining of a highway tunnel according to this utility model.

[0019] Figure 2 This is a schematic diagram of the overall structure of the temporary support structure for the replacement of the arch lining of each highway tunnel according to this utility model.

[0020] Figure 3 This is a schematic diagram of the end structure of the transverse temporary support of this utility model;

[0021] Figure 4 This is a schematic diagram showing the connection between the novel transverse temporary support and the locking anchor pipe.

[0022] In the figure, 1—temporary transverse support, 2—longitudinal connecting rod, 3—anchor pipe, 4—lining structure, 5—steel plate, and 6—through hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] To address the issues of lining deformation control and secondary lining sidewall instability during tunnel arch replacement and reinforcement, this embodiment provides a temporary support structure for highway tunnel arch lining replacement. For example... Figure 1 As shown, several sets of temporary support structures for the replacement of the arch lining of the highway tunnel are evenly spaced on top of the backfill slag in the section where the arch lining of the highway tunnel is being replaced. For example... Figure 2 As shown, each set of temporary support structures for the replacement of the arch lining of the highway tunnel includes several transverse temporary supports 1, longitudinal connecting rods 2, and anchor pipes 3.

[0025] Specifically, such as Figure 2As shown, the transverse temporary support 1 is made of I25b I-beams, and its length is determined according to the tunnel cross-section and the replacement range of the lining arch. Several transverse temporary supports 1 are set at equal horizontal intervals, with a longitudinal spacing of 60cm. Both ends of each transverse temporary support 1 extend to the lining structure 4 of the highway tunnel to support the lining on both sides of the arch, providing direct support. It should be noted that the transverse temporary support 1 can be made of straight I25b I-beams or I25b I-beams with a downward curvature, depending on the actual engineering requirements.

[0026] like Figure 2 As shown, the longitudinal connecting rod 2 is used to connect adjacent transverse temporary supports 1 into one unit, enhancing overall stability; and for connection between temporary support structures for the replacement of arch linings in adjacent highway tunnels. The longitudinal connecting rod 2 is made of I16 I-beams, and the longitudinal connecting rods 2 are arranged laterally staggered among several transverse temporary supports 1, with a spacing of 100cm; both ends of each longitudinal connecting rod 2 are welded and fixed to two adjacent transverse temporary supports 1.

[0027] like Figure 1 and Figure 2 As shown, the anchor pipe 3 is driven diagonally downward at both ends of the transverse temporary support 1. The anchor pipe 3 penetrates the tunnel lining structure 4 and is driven into the surrounding rock to provide anchoring force and support force to the transverse temporary support 1.

[0028] The temporary support structure for the replacement of the arch lining of this highway tunnel utilizes a support system consisting of backfill muck, transverse temporary supports 1, longitudinal connecting rods 2, and anchor pipes 3 to form a temporary invert arch during the replacement of the arch lining, thereby achieving effective support for the tunnel structure. Its working principle is as follows:

[0029] 1. Coordinated backfilling of tunnel slag to form a temporary inverted arch: Before replacing the arch lining, the surrounding rock of the replacement section is reinforced and backfilled with tunnel slag. A transverse temporary support 1 is placed on top of the backfilled tunnel slag, working together with the tunnel slag to form a temporary inverted arch. This structure can effectively share the arch load, optimize the stress distribution, and prevent lining deformation or collapse caused by the removal of the old arch.

[0030] 2. Controlling Lining Deformation: Transverse temporary supports 1 directly abut against the lining on both sides of the arch waist, providing transverse support force; longitudinal connecting rods 2 connect adjacent transverse temporary supports 1 into one unit, enhancing overall stability. Locking anchor pipes 3 are driven obliquely downward into the surrounding rock and grouted for fixation, further anchoring the transverse temporary supports 1 and preventing them from slipping or loosening. Through the synergistic effect of these components, lining deformation is effectively controlled.

[0031] 3. Preventing instability and damage to the secondary lining sidewalls: During the replacement of the arch lining, the secondary lining sidewalls are prone to instability due to the loss of upper support. The temporary support structure for the replacement of the arch lining of this highway tunnel provides reliable support for the secondary lining sidewalls through robust lateral support and the lateral restraint force of the anchor pipes 3, preventing instability and damage and ensuring construction safety.

[0032] 4. Maintaining Tunnel Structural Stability: The temporary support structure for the replacement of the tunnel arch lining is tightly connected through welding and anchoring, forming a robust and highly stable temporary support system. During construction, this temporary support structure maintains the overall stability of the tunnel, ensuring the smooth progress of the arch replacement work. The temporary support structure is removed after the new lining reaches its design strength, guaranteeing the long-term stability and safety of the tunnel structure.

[0033] Furthermore, as a preferred technical solution in this embodiment, to ensure the stability of the connection between the locking anchor pipe 3 and both ends of the transverse temporary support 1, such as... Figure 3 and Figure 4 As shown, in this embodiment, rectangular steel plates 5 are welded and fixed at both ends of the transverse temporary support 1. The steel plates 5 are symmetrically provided with through holes 6 through which the locking anchor pipe 3 can pass. The steel plates 5 serve as connectors to fix the locking anchor pipe 3 and tightly connect the locking anchor pipe 3 to the transverse temporary support 1, thereby enhancing the connection strength and ensuring that the function of the locking anchor pipe 3 can be effectively transmitted to the transverse temporary support 1.

[0034] In addition, to ensure that the anchor pipe 3 provides anchoring force, in this embodiment, the anchor pipe 3 is a 42×4 grouting pipe. The anchor pipe 3 is set at an angle of 30~45 degrees relative to the horizontal line. One end of the anchor pipe passes through the through hole 6 on the steel plate 5 and is welded and fixed to the steel plate 5. The other end of the anchor pipe penetrates the tunnel lining structure 4 and is driven into the surrounding rock and then grouted and fixed.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A temporary support structure for replacing the arch lining of a highway tunnel, characterized in that: Several sets of temporary support structures for the replacement of the arch lining of the highway tunnel are set at equal intervals on top of the backfill slag in the section where the arch lining of the highway tunnel is replaced. Each set of temporary support structures for the replacement of the arch lining of the highway tunnel includes several transverse temporary supports, longitudinal connecting rods, and anchor pipes; several transverse temporary supports are set at equal intervals horizontally, and adjacent transverse temporary supports are connected and fixed by several longitudinal connecting rods; both ends of each transverse temporary support extend to the lining structure of the highway tunnel and are fixed by anchor pipes that penetrate the tunnel lining structure and are driven into the surrounding rock.

2. The temporary support structure for replacing the arch lining of a highway tunnel according to claim 1, characterized in that: The lateral temporary support is a straight I-beam or an I-beam with a downward curve.

3. The temporary support structure for replacing the arch lining of a highway tunnel according to claim 1, characterized in that: The longitudinal connecting rods are arranged laterally staggered among several transverse temporary supports, and the two ends of each longitudinal connecting rod are welded and fixed to the two adjacent transverse temporary supports.

4. The temporary support structure for replacing the arch lining of a highway tunnel according to claim 1, characterized in that: The two ends of the lateral temporary support are welded and fixed with rectangular steel plates, and the steel plates are symmetrically provided with through holes through which the locking foot anchor pipes can pass.

5. The temporary support structure for replacing the arch lining of a highway tunnel according to claim 3, characterized in that: The anchor pipe is a grouting pipe. The anchor pipe is set at an angle of 30 to 45 degrees relative to the horizontal line. One end of the anchor pipe passes through the through hole in the steel plate and is welded and fixed to the steel plate. The other end of the anchor pipe penetrates the tunnel lining structure and is driven into the surrounding rock and then grouted and fixed.

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