A method for detecting cold seam drilling in tunnel lining construction

Abstract

The present invention discloses a method for detecting cold joints in tunnel lining construction by drilling, which belongs to the technical field of tunnel construction and solves the technical problem in the prior art that it is difficult to determine the drilling position during the verification process of cold joint drilling in tunnel lining construction. It includes the following steps: S1, conduct on-site cleaning and investigation, and determine the number of holes to be drilled for detection based on the length and direction of the construction cold joint; S2, determine the drilling position for drilling detection based on the tunnel lining structure and the positional relationship between the construction cold joint in the tunnel lining and the tunnel lining; S3, determine the drilling direction and drilling depth; S4, determine the specific data of the construction cold joint by coring the holes. The method for detecting cold joints in tunnel lining construction of the present invention can be better used for the drilling detection of cold joints in tunnel lining construction, and has convenient operation, accurate positioning, and high detection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a cold seam drilling detection method for tunnel lining construction. Background Art

[0002] Construction cold joints are gaps formed during the pouring of lining concrete. Due to reasons such as concrete supply, process management or equipment failure, one lining plate cannot be poured continuously. The subsequent concrete pouring is carried out only after the initial or final setting of the concrete poured at a certain pouring height. Concrete structures with cold joints have great safety hazards, affecting the grip and integrity of the concrete on the steel bars, and also affecting the protection of the concrete on the steel bars. Water may corrode the steel bars through the construction cold joints, thereby affecting the waterproof performance and service life of the structure.

[0003] Impact drills are widely used in the field of civil engineering for drilling verification. For example, verification of internal defects in concrete and the fullness of grouting in prestressed pipes requires drilling sampling or endoscopic exploration to perform micro-destructive verification of non-destructive testing results.

[0004] Before conducting cold joint drilling inspection in tunnel lining construction, it is usually necessary to determine different drilling positions based on the length and direction of the construction cold joint. Currently, drilling workers usually need to rely on experience to judge the drilling position, but construction cold joints are usually horizontal or low on the primary support side, which requires a high level of experience for workers to determine the drilling position. If there is a delay or misjudgment in the drilling position judgment process, it will affect the subsequent drilling sampling and exploration results. Therefore, verification drilling for such joints is more difficult. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for detecting cold seam drilling in tunnel lining construction, so as to solve the technical problem in the prior art that it is difficult to determine the drilling position during the verification process of cold seam drilling in tunnel lining construction.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a method for detecting cold seam drilling in tunnel lining construction, comprising the following steps:

[0008] S1. Conduct site cleaning and inspection, and determine the number of holes to be drilled for testing based on the length and direction of the cold joints.

[0009] S2. Determine the drilling location for drilling inspection based on the tunnel lining structure and the positional relationship between the cold joints constructed in the tunnel lining and the tunnel lining;

[0010] S3, determining the drilling direction and drilling depth;

[0011] S4. Determine the relevant data of the construction cold joint through core drilling detection.

[0012] Optionally or preferably, determining the number of drill holes in the drilling inspection in S1 includes setting 3-5 drill holes according to different heights and shapes of construction cold joints on the tunnel lining.

[0013] Optionally or preferably, the longitudinal construction cold joint of the tunnel lining side wall is provided with 3 drill holes, and the longitudinal cold joint or crescent-shaped cold joint of the tunnel lining vault is provided with 5 drill holes.

[0014] Optionally or preferably, when determining the drilling position in the drilling inspection in S, the distance L between the drilling position and the construction cold joint is obtained by measuring the vertical distance between the construction cold joint and the center of the tunnel lining, the horizontal distance between the construction cold joint and the center of the tunnel lining, the radius of the tunnel lining, and the length of the construction cold joint on the cross section of the tunnel lining;

[0015]

[0016] Where L is the distance between the drilling position and the construction cold joint, r is the radius of the tunnel lining, x is the horizontal distance between the construction cold joint and the center of the tunnel lining, y is the vertical distance between the construction cold joint and the center of the tunnel lining, and m is half the length of the construction cold joint on the cross section of the tunnel lining.

[0017] Optionally or preferably, the drilling positions in S2 are in the middle or at both ends of each construction cold joint.

[0018] Optionally or preferably, the drilling position is located below the construction cold joint.

[0019] Optionally or preferably, the drilling direction in S3 is along the radial direction of the tunnel lining; and the drilling depth is 70%-80% of the designed thickness of the tunnel lining.

[0020] Based on the above technical solution, the embodiments of the present invention can produce at least the following technical effects:

[0021] The present invention provides a method for detecting cold joints in tunnel lining construction by drilling holes. By accurately setting the number, position and direction of drill holes in the drilling detection, the quality of the drill holes is improved. Without damaging the waterproof board and the existing structure, the core samples taken out by drilling can better reflect the existence and development of cold joints in tunnel lining construction, thereby improving the detection efficiency of cold joints in tunnel lining construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of the cold seam drilling detection method for tunnel lining construction of the present invention;

[0023] Figure 2 This is a schematic diagram of the arrangement of drilling holes in the tunnel lining section in the cold seam drilling detection method for tunnel lining construction of the present invention;

[0024] Figure 3 yes Figure 2 A partial enlarged schematic diagram of the middle part A;

[0025] Figure 4 It is a schematic diagram of the relationship between construction cold joints and drilling hole positions in the tunnel lining construction cold joint drilling detection method of the present invention.

[0026] In the figure: 1. Construction of cold joint; 2. Tunnel lining; 3. Drilling; 4. Top surface of inner rail. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work shall fall within the scope of protection of the present invention.

[0028] See also Figure 1 A method for detecting cold seam drilling in tunnel lining construction comprises the following steps:

[0029] S1. Conduct site cleaning and inspection, and determine the number of holes to be drilled for testing based on the length and direction of the cold joints.

[0030] Specifically, the on-site cleanup inspection includes:

[0031] (1) Investigate the location of the cold joint: During the on-site investigation, the location of the cold joint must be clearly identified, including the starting and ending positions of the cold joint and the form of the cold joint;

[0032] (2) Check the status of the cold joint: During the inspection, it is necessary to check the status of the cold joint, including the degree of cracks, depth, width, etc. of the cold joint, and also to check the filling and density of the cold joint;

[0033] (3) Measure the size of the cold joint: It is necessary to measure the size of the cold joint, including the length, width, depth of the cold joint and the relevant dimensions of the tunnel lining, so as to determine the depth and position of the drill hole;

[0034] (4) Understanding the tunnel structure: On-site inspection also requires understanding the tunnel structure, including the shape, structural type, and wall properties, in order to select appropriate detection methods;

[0035] (5) Consider safety factors: Safety factors also need to be considered during on-site inspections, such as determining the ventilation conditions at the construction site and the safety of the surrounding environment.

[0036] The above-mentioned on-site inspection can fully understand the tunnel and cold joint conditions, providing an important basis for subsequent testing and treatment. At the same time, the on-site inspection can also help personnel better understand the tunnel structure and environment, so as to better select detection methods and determine treatment plans.

[0037] See also Figure 2 In this embodiment, the method for determining the number of drill holes in the drilling inspection is to set 3-5 drill holes 3 according to the different heights and shapes of the construction cold joints 1 on the tunnel lining 2; specifically, the longitudinal construction cold joints of the tunnel lining side walls are provided with 3 drill holes, and the crescent-shaped cold joints of the tunnel lining arch are provided with 5 drill holes; the above-mentioned drill holes are respectively arranged in sequence along the top surface of the inner rail of the tunnel cross section and upward along the radial direction of the cross section, and the heights of the above-mentioned drill hole positions from the top surface of the inner rail are 129 cm, 300 cm, 450 cm, 600 cm, 650 cm, 700 cm, 750 cm, and 800 cm respectively, and the thickness of the tunnel lining is 50 cm; by selecting a suitable distance for drilling according to the different heights of the construction cold joints, it is ensured that the core samples obtained by drilling can reflect the conditions of the construction cold joints.

[0038] S2. Determine the drilling location for drilling inspection based on the tunnel lining structure and the positional relationship between the cold joints constructed in the tunnel lining and the tunnel lining;

[0039] See also Figures 3 and 4 The method for determining the drilling position in the drilling detection in step S2 above comprises the following steps:

[0040] The distance between the drilling position and the construction cold joint is obtained by measuring the vertical distance between the construction cold joint and the lining circle center on the tunnel lining surface, the horizontal distance between the construction cold joint and the lining circle center, the tunnel lining radius, and the length of the construction cold joint on the tunnel lining cross section. The distance L between the drilling position and the construction cold joint is:

[0041]

[0042] Where L is the distance between the drilling position and the construction cold joint, r is the radius of the tunnel lining, x is the horizontal distance between the construction cold joint and the center of the lining circle, y is the vertical distance between the construction cold joint and the center of the lining circle, and m is half the length of the construction cold joint on the cross section of the tunnel lining.

[0043] It should be noted that in order to ensure that the core sample after drilling has verification reference value, drilling should not be carried out across the construction cold joint. The drilling position should be below the construction cold joint, and the position of each drilling position for each construction cold joint in the longitudinal direction of the tunnel should be selected between and at both ends of the construction cold joint.

[0044] S3, determining the drilling direction and drilling depth;

[0045] In this embodiment, after the drilling position is determined by the above method, the drilling direction is selected to be the radial direction along the tunnel lining diameter; the drilling depth is selected to ensure that the core sample can detect and verify the construction cold joint situation and does not damage the waterproof structure of the tunnel lining; specifically, the drilling depth is 70%-80% of the design thickness of the tunnel lining. When determining the drilling depth, it is necessary to comprehensively consider the internal structural characteristics of the tunnel, the cold joint position, the performance of the drilling instrument, and the experience and practice of the staff. In this embodiment, the drilling depth is 70% of the design thickness of the tunnel lining.

[0046] It should be noted that when conducting drilling inspections, vibration will have a certain impact on the tunnel structure and the construction cold joints. When drilling, some methods need to be adopted to minimize the impact of vibration on the cold joints. First, use low-vibration drilling equipment or drilling equipment with vibration reduction function to reduce the vibration amplitude of the equipment and reduce the impact of vibration on the structure. Second, use vibration isolation materials such as rubber plates to isolate the drilling equipment from the structure as much as possible to reduce the degree of vibration transmission to the structure. In this embodiment, it is necessary to pay attention to the impact of vibration at the drilling position on the construction cold joint. In addition, other vibration isolation and vibration reduction measures can be taken according to actual conditions, such as using low-speed drilling and progressive drilling layer by layer to minimize the impact of vibration.

[0047] The present invention provides a method for detecting cold seam drilling in tunnel lining construction, which has the following beneficial effects:

[0048] By accurately setting the number, location and direction of drill holes in drilling inspection, the quality of drilling holes can be improved. Without damaging the waterproof board and existing structure, the core samples taken out from the drilling can better reflect the existence and development of cold joints in tunnel lining construction, thereby improving the detection efficiency of cold joints in tunnel lining construction.

[0049] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting cold seam drilling in tunnel lining construction, characterized in that: The following steps are involved: S1. Conduct site cleaning and inspection, and determine the number of drill holes (3) to be drilled for testing based on the length and direction of the construction cold joint (1); S2, determining the position of the drilling hole (3) for drilling (3) detection based on the structure of the tunnel lining (2) and the positional relationship between the cold joint (1) constructed in the tunnel lining (2) and the tunnel lining (2); S3, determining the direction and depth of the drilling hole (3); S4, determining relevant data of the construction cold joint (1) by coring and testing the drilling hole (3); When determining the position of the borehole (3) in the borehole (3) detection in S2, the distance between the position of the borehole (3) and the construction cold joint (1) is obtained by measuring the vertical distance between the construction cold joint (1) on the surface of the tunnel lining (2) and the center of the tunnel lining (2), the horizontal distance between the construction cold joint (1) and the center of the tunnel lining (2), the radius of the tunnel lining (2), and the length of the construction cold joint (1) on the cross section of the tunnel lining (2). L ; in, L is the distance between the drilling hole (3) and the construction cold joint (1), r is the radius of the tunnel lining (2), x is the horizontal distance between the construction cold joint (1) and the center of the tunnel lining (2), y is the vertical distance between the construction cold joint (1) and the center of the tunnel lining (2), m It is half the length of the cold joint (1) constructed on the cross section of the tunnel lining (2).

2. The method for detecting cold seam drilling in tunnel lining construction according to claim 1, characterized in that: The number of the boreholes (3) in the S1 borehole (3) test is: 3-5 boreholes (3) are set according to the different heights and shapes of the cold joints (1) constructed on the tunnel lining (2).

3. The method for detecting cold seam drilling in tunnel lining construction according to claim 2, characterized in that: The longitudinal cold joint (1) of the side wall of the tunnel lining (2) is provided with three drill holes (3), and the longitudinal cold joint (1) or crescent-shaped cold joint (1) of the arch of the tunnel lining (2) is provided with five drill holes (3).

4. The method for detecting cold seam drilling in tunnel lining construction according to claim 3, characterized in that: The drilling holes (3) in S2 are located at the middle or both ends of each construction cold joint (1).

5. The method for detecting cold seam drilling in tunnel lining construction according to claim 4, characterized in that: The drill hole (3) is located below the construction cold joint (1).

6. The method for detecting cold seam drilling in tunnel lining construction according to claim 1, characterized in that: The direction of the drilling hole (3) in S3 is along the radial direction of the tunnel lining (2); the depth of the drilling hole (3) is 70%-80% of the designed thickness of the tunnel lining (2).

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