A method for reinforcing construction of a steel lining by adding without changing the size of the water tunnel section

Abstract

A kind of reinforcing construction method of additional steel lining without changing the size of water tunnel section, comprising the following steps: measuring the internal shape size of original tunnel lining concrete, processing lining steel plate and ring positioning ring; chiseling concrete to install ring positioning ring and fixing with chemical anchor bolt; after the bottom of ring positioning ring is closed and reinforced, the concrete surface is processed with it as a template; then, lining steel plate is installed from bottom to top in pieces, spot welding first and then full welding with ring positioning ring; chemical grouting is carried out after each pipe section is installed; longitudinal positioning block is welded before subsequent pipe section installation. Compared with traditional crack grouting and surface treatment, the scheme effectively solves the problems of water tunnel diseases such as leakage and strength by adding lining steel plate without changing the size of water tunnel section, while maintaining the integrity of the tunnel structure, effectively solving the problems of water tunnel diseases such as leakage and strength, and the construction effect is long-term effective, which can effectively avoid the repeatability of traditional treatment method.

Description

Technical Field

[0001] This invention relates to the field of hydraulic tunnel reinforcement engineering technology, and in particular to a construction method for adding steel lining for reinforcement without changing the cross-sectional dimensions of hydraulic tunnels. Background Technology

[0002] During long-term operation, hydraulic tunnels frequently develop defects such as cracks, leaks, and surface erosion due to material aging, geological changes, and hydraulic scouring. At the same time, many old tunnels require structural reinforcement or reinforcement of tunnels with defects in lining construction quality.

[0003] Currently, traditional methods for addressing these problems mainly include crack grouting, surface repair, and demolition and reconstruction. Crack grouting and surface repair are passive treatments, often only providing temporary relief and failing to address the root cause of the problem. Their effects are not long-lasting, and the damage is prone to recurrence. Demolition and reconstruction, on the other hand, have significant drawbacks such as high project costs, long construction periods, and high safety risks during construction. Furthermore, they are often impossible to implement under certain special conditions.

[0004] Therefore, there is an urgent need for a method for reinforcing hydraulic tunnels that can provide a lasting solution to the problems of defects in hydraulic tunnels without requiring the demolition and reconstruction of the tunnels. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides a construction method for adding steel lining for reinforcement without changing the cross-sectional dimensions of hydraulic tunnels. This method can effectively and permanently solve the problems of defects in hydraulic tunnels without demolishing and rebuilding the tunnels. It has the characteristics of low cost, short construction period and safe construction.

[0006] To achieve the above objectives, the technical solution adopted by this invention is as follows: a construction method for reinforcing hydraulic tunnels by adding steel linings without changing the cross-sectional dimensions, comprising the following steps: 1. Measure the internal dimensions of the original tunnel lining concrete to determine the dimensions of the lining steel plate and the circumferential positioning ring, and process the lining steel plate and the circumferential positioning ring according to the determined dimensions; 2. Measure and mark the installation position of the circumferential positioning ring, and then remove the concrete at the installation position of the circumferential positioning ring. 3. Install a circumferential positioning ring at the installation position of the circumferential positioning ring, and fix the circumferential positioning ring with chemical anchors; IV. Seal and reinforce the bottom of the circumferential positioning ring; 5. Using two adjacent circumferential positioning rings as templates, remove the concrete that is higher than the circumferential positioning rings and remove the carbonized layer on the surface of the original lining concrete that is lower than the circumferential positioning rings. 6. Rinse the concrete surface after chiseling; 7. Install a pipe section lining steel plate. The lining steel plate of the pipe section is divided into multiple pieces and installed from bottom to top. During installation, each lining steel plate is spot welded to the circumferential positioning ring. After all the lining steel plates of the pipe section are spot welded, full welding is performed. 8. Chemical grouting shall be carried out after each pipe section of lining steel plate is installed; 9. Before installing the lining steel plates of the subsequent pipe sections, weld the longitudinal positioning blocks, and then repeat the installation steps 2 to 8 above.

[0007] As a further improvement of the present invention, the circumferential positioning ring is used for radial positioning of the lining steel plate; the circumferential positioning serves as a detection benchmark for whether the concrete removal is in place; and the circumferential positioning acts as a grout stop during chemical grouting.

[0008] As a further improvement of the present invention, in step one, the inner diameter of the lining steel plate is the same as the inner diameter of the original tunnel lining concrete.

[0009] As a further improvement of the present invention, in step three, the spacing between the chemical anchors of the circumferential positioning ring is 2 meters.

[0010] As a further improvement of the present invention, in step seven, the connection between each lining steel plate is made by single-sided welding.

[0011] As a further improvement of the present invention, in step seven, when installing the lining steel plate, its two ends are tightly attached to the circumferential positioning ring, and the position of the longitudinal weld is reserved.

[0012] As a further improvement of the present invention, the lining steel plate is pre-reserved with grouting holes during processing, including the bottom, top and both sides, with at least two holes at each location, which serve as grouting holes and venting holes respectively.

[0013] As a further improvement of the present invention, in step eight, chemical grouting is performed through the grouting holes on the lining steel plate; the chemical grouting is performed from bottom to top and symmetrically from left to right; after the chemical grouting is completed, the grouting holes are sealed by welding.

[0014] As a further improvement of the present invention, in step nine, the longitudinal positioning block is used for radial positioning of the upstream lining steel plate during subsequent pipe section installation. When the lining steel plate is installed, it can be radially installed in place by closely adhering to the longitudinal positioning block, and only longitudinal adjustment of the lining steel plate is required.

[0015] The beneficial effects of this invention are as follows: I. Excellent treatment effect: Compared with traditional crack grouting and surface treatment, this solution adds lining steel plates without changing the cross-sectional dimensions of the hydraulic tunnel. While maintaining the integrity of the tunnel structure, it effectively strengthens the tunnel structure and solves problems such as leakage and strength in hydraulic tunnels. The construction effect is long-term and can effectively avoid the repetitive nature of traditional treatment methods.

[0016] Second, high safety assurance: The entire construction process is carried out inside the existing lining, without the need for large-scale demolition and reconstruction, which greatly reduces the construction safety risks.

[0017] Third, it is economical and efficient with a short construction period: Compared with demolition and reconstruction, this method significantly reduces costs, has clear construction procedures, and greatly shortens the construction period.

[0018] IV. Adjustable structural strength: Different degrees of reinforcement of the tunnel can be achieved by selecting lining steel plates of different thicknesses. When the thickness of the lining steel plate reaches a certain level, it can be directly used as a pressurized tunnel steel pipe.

[0019] V. Wide range of applications: This solution only requires a small amount of chiseling away from the original lining surface. It will not cause large-scale damage to the tunnel during construction and will have little disturbance to the overall tunnel structure. Therefore, it has a wide range of applications and is particularly suitable for various hydraulic tunnel reinforcement scenarios where demolition and reconstruction are not allowed or impossible. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments.

[0021] A method for reinforcing hydraulic tunnels by adding steel linings without altering the cross-sectional dimensions includes the following steps: Step 1: A precise measurement of the internal dimensions of the original tunnel lining concrete is conducted to determine the internal structural dimensions and tunnel axis, thereby determining the required dimensions of the lining steel plates and circumferential positioning rings. Subsequently, the lining steel plates and circumferential positioning rings are fabricated according to the determined dimensions. The inner diameter of the lining steel plates is the same as the inner diameter of the original tunnel lining concrete. During fabrication, because a single tunnel section's lining steel plate cannot be installed as a whole in one go, each tunnel section is divided into multiple lining steel plates for fabrication, which are then welded together as a whole during on-site construction.

[0022] Step 2: Measure and mark the installation position of the circumferential positioning ring at the predetermined location. Use a rock drill to remove the original lining concrete at the marked area to create the installation position.

[0023] Step 3: Install the circumferential positioning ring in the installation position and fix it with chemical anchors. The spacing of the chemical anchors should be controlled at 2 meters to ensure that the circumferential positioning ring is installed firmly.

[0024] Step 4: To ensure that the subsequent chemical grouting does not leak, the bottom of the circumferential positioning ring is sealed and the circumferential positioning ring is reinforced.

[0025] Step 5: Using two adjacent circumferential positioning rings as reference frames, inspect the concrete surface between them. Use tools to chisel away the raised parts of the original lining concrete that are higher than the reference surface of the circumferential positioning rings, and chisel away the carbonized layer on the surface of the original lining concrete that is lower than the reference surface of the circumferential positioning rings.

[0026] Step Six: Use a high-pressure water gun to rinse the concrete surface after the chiseling treatment in Step Five.

[0027] Step Seven: Begin installing the lining steel plates for the first pipe section. Divide the lining steel plates of this pipe section into several segments and install them from bottom to top. During installation, ensure that both ends of each lining steel plate are tightly against the circumferential positioning rings, and reserve the positions for longitudinal welds. After each lining steel plate is in place, first spot weld it to the circumferential positioning rings for fixation. After all the lining steel plates of this pipe section have been spot welded and fixed, perform full welding to connect the lining steel plates into a whole. The circumferential connections between the lining steel plates are made using single-sided welding.

[0028] Step 8: After the first pipe section's lining steel plate is installed and fully welded, chemical grouting is immediately performed. The lining steel plate has pre-drilled holes located at the bottom, top, and both sides, with at least two holes at each location. These two holes serve as a grouting hole and a vent hole, respectively. Chemical grouting is performed through these pre-drilled holes on the lining steel plate. The chemical grouting process proceeds symmetrically from bottom to top, ensuring that the grout fills the gap between the lining steel plate and the original concrete lining. After chemical grouting is completed, all grouting holes are sealed by welding.

[0029] Step Nine: After the lining steel plate of the first pipe section is installed, before installing the lining steel plates of subsequent pipe sections, weld longitudinal positioning blocks on the upstream side of the pipe section. Then, repeat steps two through eight above to install, weld, and chemically grout the lining steel plates of all subsequent pipe sections until the entire tunnel reinforcement is completed. The longitudinal positioning blocks serve as radial positioning on the upstream side. When installing the lining steel plates, they can be radially installed in place by being close to the longitudinal positioning blocks, requiring only longitudinal adjustment.

[0030] Through the implementation of this embodiment, the tunnel was successfully reinforced without changing the cross-sectional dimensions of the tunnel flow, thus solving the problems of leakage and structural safety in the tunnel.

[0031] In the above steps, the circumferential positioning ring mainly serves three functions: 1. Positioning the lining steel plate. During installation, the lining steel plate can be radially installed by fitting it tightly against the circumferential positioning ring; only longitudinal adjustment is required.

[0032] 2. Verify that the concrete removal is complete. This construction method does not change the original inner diameter of the tunnel lining; therefore, a small amount of concrete needs to be removed from the lining surface. Due to the large area to be removed, conventional instrument measurement methods cannot accurately and conveniently determine whether the removal is complete. After installing circumferential positioning rings on both sides, it is only necessary to use a straightedge or string line to visually check whether the removal is complete.

[0033] 3. The function of the grout-stopping ring. After the steel lining plate of each pipe section is installed, chemical grouting is required for fixation, and the circumferential positioning ring can play the role of stopping the grouting.

[0034] The above-described embodiments are merely illustrative of the present invention. Any equivalent embodiments made by those skilled in the art, without departing from the scope of the technical features disclosed in the present invention, using partial modifications or alterations to the technical content disclosed in the present invention, shall still fall within the scope of the technical features of the present invention.

Claims

1. A method for reinforcing hydraulic tunnels by adding steel linings without altering the cross-sectional dimensions, characterized in that, Includes the following steps:

1. Measure the internal dimensions of the original tunnel lining concrete to determine the dimensions of the lining steel plate and the circumferential positioning ring, and process the lining steel plate and the circumferential positioning ring according to the determined dimensions; 2. Measure and mark the installation position of the circumferential positioning ring, and then remove the concrete at the installation position of the circumferential positioning ring.

3. Install a circumferential positioning ring at the installation position of the circumferential positioning ring, and fix the circumferential positioning ring with chemical anchors; IV. Seal and reinforce the bottom of the circumferential positioning ring; 5. Using two adjacent circumferential positioning rings as templates, remove the concrete that is higher than the circumferential positioning rings and remove the carbonized layer on the surface of the original lining concrete that is lower than the circumferential positioning rings.

6. Rinse the concrete surface after chiseling; 7. Install a pipe section lining steel plate. The lining steel plate of the pipe section is divided into multiple pieces and installed from bottom to top. During installation, each lining steel plate is spot welded to the circumferential positioning ring. After all the lining steel plates of the pipe section are spot welded, full welding is performed.

8. Chemical grouting shall be carried out after each pipe section of lining steel plate is installed; 9. Before installing the lining steel plates of the subsequent pipe sections, weld the longitudinal positioning blocks, and then repeat steps two to eight above.

2. The method for reinforcing hydraulic tunnels by adding steel linings without changing the cross-sectional dimensions of the tunnel, as described in claim 1, is characterized in that: The circumferential positioning ring is used for radial positioning of the lining steel plate; the circumferential positioning serves as a benchmark for detecting whether the concrete removal is in place; the circumferential positioning acts as a stop for grouting during chemical grouting.

3. The method for reinforcing hydraulic tunnels by adding steel linings without changing the cross-sectional dimensions of the tunnel, as described in claim 1, is characterized in that: In step one, the inner diameter of the lining steel plate is the same as the inner diameter of the original tunnel lining concrete.

4. The method for reinforcing hydraulic tunnels by adding steel linings without changing the cross-sectional dimensions of the tunnel, as described in claim 1, is characterized in that: In step three, the spacing between the chemical anchors of the circumferential positioning ring is 2 meters.

5. The method for reinforcing hydraulic tunnels by adding steel linings without changing the cross-sectional dimensions of the tunnel, as described in claim 1, is characterized in that: In step seven, the connection between each lining steel plate is made by single-sided welding.

6. The method for reinforcing hydraulic tunnels by adding steel linings without changing the cross-sectional dimensions of the tunnel, as described in claim 1, is characterized in that: In step seven, when installing the lining steel plate, its two ends are tightly attached to the circumferential positioning ring, leaving space for the longitudinal weld.

7. The method for reinforcing hydraulic tunnels by adding steel linings without changing the cross-sectional dimensions of the tunnel, as described in claim 1, is characterized in that: The lining steel plate is pre-drilled with grouting holes during processing, including the bottom, top and both sides, with at least two holes at each location, which serve as a grouting hole and an air vent, respectively.

8. The method for reinforcing a hydraulic tunnel by adding steel lining without changing the cross-sectional dimensions of the tunnel, as described in claim 7, is characterized in that: In step eight, chemical grouting is performed through the grouting holes on the lining steel plate; the chemical grouting is carried out from bottom to top and symmetrically from left to right; after the chemical grouting is completed, the grouting holes are sealed by welding.

9. The method for reinforcing hydraulic tunnels by adding steel linings without changing the cross-sectional dimensions of the tunnel, as described in claim 1, is characterized in that: In step nine, the longitudinal positioning block is used for radial positioning of the upstream lining steel plate during subsequent pipe section installation. When installing the lining steel plate, the lining steel plate can be radially installed in place by closely adhering to the longitudinal positioning block, and only longitudinal adjustment of the lining steel plate is required.