Method for detecting the length of the overlap of the reinforcement of a diaphragm wall

Abstract

The application relates to a detection method for the steel bar lap joint length of an underground continuous wall, which comprises the following steps: measuring the displacement deviation of the lap joint steel bars of a first slot section and a second slot section at different depths; measuring the top opening steel bar lap joint length of the lap joint steel bars of the first slot section and the second slot section at a top opening; and calculating the steel bar lap joint length of the lap joint steel bars of the first slot section and the second slot section at different depths according to the displacement deviation and the top opening steel bar lap joint length. The application provides a detection method for the steel bar lap joint length of an underground continuous wall, which is simple and easy to operate, can effectively and accurately detect the steel bar lap joint length, and avoids the influence of the overlong or too short steel bar lap joint length on the lap joint quality of the steel bar lap joint.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, in particular to a detection method for the reinforcement lap length of an underground continuous wall, and is particularly suitable for super-deep underground continuous walls. BACKGROUND

[0002] An underground continuous wall is a unit slot section formed by pouring concrete into a reinforcement cage, and is constructed in segments to form a continuous reinforced concrete wall underground, serving as a water-cutting, anti-seepage, load-bearing and water-retaining structure. The underground continuous wall has the advantages of short construction period, reliable quality, large rigidity, low noise and suitability for various ground conditions, and is increasingly applied in large bridge foundations. In recent years, with the construction of large-span sea-crossing and river-crossing bridges and urban subways, the design and construction of underground continuous wall joints have become increasingly mature and sophisticated.

[0003] In the technology of underground continuous walls, the connecting structure between unit slot sections is one of the cores of the underground continuous wall, and the mechanical properties of the slot section joint determine the overall structural rigidity of the underground continuous wall. The joint forms include flexible joints and rigid joints, and rigid joints are widely used because they can bear tensile force, shear force, etc. between the joints. The anti-seepage effect and mechanical properties of the reinforcement lap joint in the rigid joint are better.

[0004] The reinforcement lap joint is generally formed by non-contact insertion and lap of multiple rows of reinforcement mesh extending out of the first slot section and the second slot section, and the first slot section wall and the second slot section wall are connected into a whole by the bonding action between the reinforcement in the joint and the concrete, which can better transfer tensile force, shear force, bending moment, etc., and has good integrity.

[0005] In related technologies, one of the important technical indicators of the reinforcement lap joint is the reinforcement lap length. If the reinforcement lap length is too short, the structure of the reinforcement lap joint is incomplete and cannot maintain rigidity; if the reinforcement lap length is too long, it affects the length of the non-lap section of the reinforcement, which does not meet the design and construction requirements. However, related technologies have not yet provided a detection method for the reinforcement lap length of an underground continuous wall, which affects the lap quality of the reinforcement lap joint due to the inability to accurately detect the reinforcement lap length. SUMMARY

[0006] The detection method for the reinforcement lap length of an underground continuous wall provided by the embodiments of the present application solves the technical problem that the reinforcement lap length cannot be accurately detected due to the lack of a detection method for the reinforcement lap length of an underground continuous wall in related technologies, which affects the lap quality of the reinforcement lap joint.

[0007] The embodiment of the present application provides a detection method for the steel bar lap joint length of a diaphragm wall, comprising the following steps: measuring the displacement deviation of the lap joint steel bars of a first slot section and a second slot section at different depths; measuring the top opening steel bar lap joint length of the lap joint steel bars of the first slot section and the second slot section at a top opening; and calculating the steel bar lap joint length of the lap joint steel bars of the first slot section and the second slot section at different depths according to the displacement deviation and the top opening steel bar lap joint length.

[0008] In some embodiments, the step of measuring the displacement deviation of the lap joint steel bars of the first slot section and the second slot section at different depths comprises:

[0009] arranging a first inclinometer tube at a first lap joint steel bar of the first slot section, placing a first inclinometer in the first inclinometer tube, and measuring the displacement deviation x of the first lap joint steel bar at different depths from the top opening;

[0010] arranging a second inclinometer tube at a second lap joint steel bar of the second slot section, placing a second inclinometer in the second inclinometer tube, and measuring the displacement deviation x' of the second lap joint steel bar at different depths from the top opening.

[0011] In some embodiments, the first inclinometer tube is fixedly connected with the first lap joint steel bar.

[0012] In some embodiments, at different depths, the first inclinometer tube is at the same distance from the end of the first lap joint steel bar.

[0013] In some embodiments, the first inclinometer tube is provided with two pairs of grooves in mutually perpendicular directions, and one pair of the grooves is parallel to the elongation direction of the first lap joint steel bar.

[0014] In some embodiments, the measurement direction of the first inclinometer is parallel to the elongation direction of the first lap joint steel bar, and the top opening is taken as a reference point.

[0015] In some embodiments, the step of calculating the steel bar lap joint length of the lap joint steel bars of the first slot section and the second slot section at different depths according to the displacement deviation and the top opening steel bar lap joint length comprises:

[0016] obtaining the displacement deviation x of the first lap joint steel bar of the first slot section at different depths from the top opening;

[0017] obtaining the displacement deviation x' of the second lap joint steel bar of the second slot section at different depths from the top opening;

[0018] obtaining the top opening steel bar lap joint length a0;

[0019] The reinforcement overlap length of the first groove section and the second groove section at different depths is calculated, and the calculation formula is a=a0-(x'-x), wherein the displacement deviation in the direction of the second groove section is positive.

[0020] In some embodiments, multiple measurement points are set according to the total detection depth when measuring the displacement deviation.

[0021] In some embodiments, the intervals of adjacent measurement points are the same in the depth direction.

[0022] In some embodiments, the method for detecting the reinforcement overlap length of the underground continuous wall further comprises:

[0023] The reinforcement overlap length of the first groove section and the second groove section at different depths is compared with a design threshold value;

[0024] If it is not within the design threshold value, adjustment is made until the design threshold value is reached.

[0025] The technical scheme provided by the present application has the beneficial effects that the present application provides a method for detecting the reinforcement overlap length of an underground continuous wall, which measures the displacement deviation and the reinforcement overlap length of the first groove section and the second groove section at different depths, calculates the reinforcement overlap length of the first groove section and the second groove section at different depths, and is simple and easy to operate, can effectively and accurately detect the reinforcement overlap length, and avoids the problem of affecting the overlap quality of the reinforcement overlap joint due to the excessively long or short reinforcement overlap length. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 The flowchart of the method for detecting the reinforcement overlap length of the underground continuous wall in an embodiment of the present application.

[0028] Figure 2 The schematic diagram of the planar arrangement of the reinforcement overlap joint in one direction in an embodiment of the present application.

[0029] Figure 3 The schematic diagram of the planar arrangement of the reinforcement overlap joint in another direction in an embodiment of the present application.

[0030] Figure 4 The schematic diagram of the displacement deviation of the overlap reinforcement at different depths in an embodiment of the present application.

[0031] Reference signs:

[0032] 1, first slot section; 11, first lap steel bar; 12, first inclinometer; 2, second slot section; 21, second lap steel bar; 22, second inclinometer. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] The present application provides a detection method for the lap length of steel bars of an underground continuous wall, which is especially suitable for super-deep underground continuous walls. One of the joint forms of the underground continuous wall is a rigid joint, which is widely used because the joint can bear tensile force, shear force and the like. The anti-seepage effect and mechanical properties of the steel bar lap joint in the rigid joint are better. The steel bar lap joint is formed by non-contactally inserting and lapping a plurality of rows of steel bar meshes extending out of a first slot section and a second slot section. The first slot section wall and the second slot section wall are connected into a whole by the bonding action between the steel bars and the concrete in the joint, and can better transmit tensile force, shear force, bending moment and the like, and have better integrity. One of the important technical indexes of the steel bar lap joint is the lap length of the steel bars.

[0035] As shown in Figure 1 , it is a flowchart of the detection method for the lap length of steel bars of an underground continuous wall in an embodiment of the present application. Figure 1

[0036] The embodiment of the present application provides a detection method for the lap length of steel bars of an underground continuous wall, which comprises the following steps.

[0037] Step S1, measuring the displacement deviation of the lap steel bars of the first slot section and the second slot section at different depths;

[0038] Step S2, measuring the top-opening steel bar lap length of the lap steel bars of the first slot section and the second slot section at a top opening;

[0039] Step S3, calculating the steel bar lap length of the lap steel bars of the first slot section and the second slot section at different depths according to the displacement deviation and the top-opening steel bar lap length.

[0040] ​The embodiment of the application provides a detection method for the steel bar lap joint length of an underground continuous wall, which measures the displacement deviation of the lap joint steel bars of a first groove section and a second groove section at different depths and the lap joint length of the top steel bars, calculates the steel bar lap joint length of the lap joint steel bars of the first groove section and the second groove section at different depths, and can effectively and accurately detect the steel bar lap joint length, thereby avoiding the influence of the excessively long or short steel bar lap joint length on the lap joint quality of the steel bar lap joint.

[0041] As shown in Figure 2 and Figure 3 , wherein, Figure 2 is a schematic diagram of the planar arrangement of the steel bar lap joint in one direction in an embodiment of the application. Figure 3 is a schematic diagram of the planar arrangement of the steel bar lap joint in another direction in an embodiment of the application.

[0042] In some embodiments, the step S1 of measuring the displacement deviation of the lap joint steel bars of the first groove section and the second groove section at different depths comprises the following steps.

[0043] A first inclinometer tube 12 is arranged at the first lap joint steel bar 11 of the first groove section 1, a first inclinometer is placed in the first inclinometer tube 12, and the displacement deviation x of the first lap joint steel bar 11 at different depths from the top is measured.

[0044] A second inclinometer tube 22 is arranged at the second lap joint steel bar 21 of the second groove section 2, a second inclinometer is placed in the second inclinometer tube 22, and the displacement deviation x' of the second lap joint steel bar 21 at different depths from the top is measured.

[0045] In some embodiments, the first groove section 1 refers to a first-stage groove section, specifically a steel box; and the second groove section 2 refers to a second-stage groove section, specifically a steel reinforcement cage. The first-stage groove section and the second-stage groove section extend out of a plurality of rows of steel mesh sheets for non-contact plug-in lap joint, which are the first lap joint steel bar 11 and the second lap joint steel bar 21 respectively.

[0046] The inclinometer tube is a measuring tube for observing horizontal displacement and provides a measuring channel for devices such as inclinometers. The inclinometer is an in-situ monitoring instrument for measuring the inclination and azimuth angle of a drill hole. When the first groove section 1 and the second groove section 2 are lowered to the design elevation, the inclinometer is used to measure the line shape of the first lap joint steel bar 11 and the second lap joint steel bar 21 at different depths.

[0047] Specifically, the inclinometer tube in the embodiment of the application comprises the first inclinometer tube 12 arranged at the first lap joint steel bar 11 of the first groove section 1 and the second inclinometer tube 22 arranged at the second lap joint steel bar 21 of the second groove section 2.

[0048] The installation mode and the measurement mode of the first inclinometer tube 12 are described below, and the installation mode and the measurement mode of the second inclinometer tube 22 are the same as those of the first inclinometer tube 12, only the installation positions are different.

[0049] In some embodiments, the first inclinometer tube 12 is fixedly connected to the first lapped reinforcing bar 11, such that the entire length of the first inclinometer tube 12 is completely tied to the first lapped reinforcing bar 11, so that the first inclinometer tube 12 remains vertical and stationary during use, ensuring the stability of the measurement.

[0050] In some embodiments, the end distance between the first inclinometer tube 12 and the first lapped reinforcing bar 11 is the same at different depths.

[0051] In some embodiments, the first inclinometer tube 12 is provided with two pairs of grooves perpendicular to each other, one pair of which is parallel to the elongation direction of the first lapped reinforcing bar 11 to ensure the accuracy of the measurement direction.

[0052] In some embodiments, the measuring direction of the first inclinometer is parallel to the elongation direction of the first lapped reinforcing bar 11, with the top opening as the reference point, which facilitates measurement and improves accuracy.

[0053] like Figure 4 As shown, Figure 4 This is a schematic diagram showing the displacement deviation of lapped reinforcing bars at different depths in one embodiment of the present invention.

[0054] After the first trench section 1 is lowered to the design elevation, the first inclinometer is placed inside the first inclinometer tube 12 to obtain the displacement deviation x(x1, x2, x3…) of the first lapped reinforcing bar 11 at different depths from the top opening of the steel box of the first trench section 1, where x1=ΔL×sinθ1, x2=x1+ΔL×sinθ2, ......, x m =x m-1 +ΔL×sinθ m .according to Figure 4 The displacement deviation of the first lapped steel bar 11 at different depths is in two states: 1 and 2.

[0055] Similarly, in the second trench section 2, after the second trench section 2 is lowered to the design elevation, a second inclinometer is placed inside the second inclinometer tube 22 to obtain the displacement deviation x′(x′1, x′2, x′3…) of the second lapped reinforcing bars 21 at different depths from the top opening of the reinforcing cage of the second trench section 2. Based on… Figure 4 The displacement deviation of the second lapped steel bar 21 at different depths is 3 and 4.

[0056] In some embodiments, calculating the lap length of the reinforcing bars in the first and second trench sections at different depths, based on the displacement deviation and the lap length of the top reinforcement, includes:

[0057] Obtain the displacement deviation x of the first lapped steel bar 11 at different depths from the top opening in the first trench segment 1;

[0058] Obtain the displacement deviation x′ of the second lapped steel bar 21 at different depths from the top opening in the second trench segment 2;

[0059] Obtain the lap length a0 of the top rebar;

[0060] Calculate the lap length of the lapped steel bars in the first trench segment 1 and the second trench segment 2 at different depths. The calculation formula is: a=a0-(x′-x), where the displacement deviation in the direction of the second trench segment 2 is positive.

[0061] In some embodiments, when measuring displacement deviation, multiple measurement points are set according to the total detection depth.

[0062] In some embodiments, adjacent measurement points are spaced at the same interval along the depth direction.

[0063] For example, when the total detection depth is 64 meters, a measurement point is set every 2 meters along the depth direction, which makes the measurement of displacement deviation more accurate.

[0064] In some embodiments, the method for detecting the lap length of the reinforcing bars in a diaphragm wall further includes:

[0065] The lap length of the reinforcing bars in the first trench segment 1 and the second trench segment 2 at different depths is compared with the design threshold.

[0066] If the value is not within the design threshold, adjustments will be made until the design threshold is reached.

[0067] This further ensures that the lap length of the reinforcing bars meets the design and construction requirements, and avoids the lap length of the reinforcing bars being too long or too short, which would affect the lap quality of the reinforcing bar lap joint.

[0068] The present invention will now be described in detail through a specific embodiment.

[0069] In this embodiment, the first trench section 1 is the first-phase trench section, specifically a steel box with a length of 65m. The second trench section 2 is the second-phase trench section, specifically a reinforcing cage with a length of 65m. The lap length detection depth of the lapped reinforcing bars is 64m. A high-precision inclinometer is selected, with a measurement accuracy of 0.01° and a resolution of 0.001°.

[0070] A first inclinometer tube 12 is installed at the first lapped reinforcing bar 11 of the first trench section 1, and a second inclinometer tube 22 is installed at the second lapped reinforcing bar 21 of the second trench section 2.

[0071] After the first trench section 1 is lowered to the design elevation, the first inclinometer is placed in the first inclinometer tube 12 to obtain the displacement deviation x (x1, x2, x3...) of the first lapped reinforcing bar 11 at different depths from the top opening of the steel cage of the first trench section 1; after the second trench section 2 is lowered to the design elevation, the second inclinometer is placed in the second inclinometer tube 22 to obtain the displacement deviation x′ (x′1, x′2, x′3...) of the second lapped reinforcing bar 21 at different depths from the top opening of the reinforcing cage of the second trench section 2. The displacement deviation data of the lapped reinforcing bars at different depths are shown in Table 1.

[0072] Table 1. Displacement deviation of lapped reinforcing bars at different depths

[0073]

[0074]

[0075] The lap length a0 of the top reinforcement at the top opening is measured using measuring equipment.

[0076] The lap length of the reinforcing bars in the first and second phase trench sections at different depths is calculated using the formula: a = a0 - (x′ - x), where the displacement deviation towards the second phase trench section is positive. The data are shown in Table 2.

[0077] Table 2. Lap length of reinforcing bars at different depths

[0078]

[0079]

[0080]

[0081] In this embodiment, the lap length of the reinforcing bars in the first trench segment 1 and the second trench segment 2 at different depths meets the design threshold, so no adjustment is required.

[0082] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the method or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" can be 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; it can be a connection within two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0083] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0084] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for detecting the lap length of reinforcing bars in a diaphragm wall, characterized in that, Includes the following steps: Measure the displacement deviation of the lapped reinforcing bars of the first trench section (1) and the second trench section (2) at different depths; Measure the lap length of the top reinforcement of the first trench segment (1) and the second trench segment (2) at the top opening; Based on the displacement deviation and the lap length of the top reinforcement, calculate the lap length of the reinforcement at different depths of the first trench segment (1) and the second trench segment (2); The displacement deviation of the lapped reinforcing bars in the first trench segment (1) and the second trench segment (2) at different depths includes: A first inclinometer tube (12) is installed at the first lapped reinforcing bar (11) of the first trench section (1). A first inclinometer is placed inside the first inclinometer tube (12) to measure the displacement deviation of the first lapped reinforcing bar (11) from the top opening at different depths. ; A second inclinometer tube (22) is installed at the second lapped steel bar (21) of the second groove section (2). A second inclinometer is placed inside the second inclinometer tube (22) to measure the displacement deviation x´ of the second lapped steel bar (21) at different depths from the top opening.

2. The method for detecting the lap length of reinforcing bars in a diaphragm wall as described in claim 1, characterized in that, The first inclinometer tube (12) is fixedly connected to the first lapped steel bar (11).

3. The method for detecting the lap length of reinforcing bars in a diaphragm wall as described in claim 2, characterized in that, At different depths, the end distance between the first inclinometer tube (12) and the first lapped reinforcing bar (11) is the same.

4. The method for detecting the lap length of reinforcing bars in a diaphragm wall as described in claim 2, characterized in that, The first inclinometer tube (12) is provided with two pairs of grooves that are perpendicular to each other, one of which is parallel to the elongation direction of the first lapped steel bar (11).

5. The method for detecting the lap length of reinforcing bars in a diaphragm wall as described in claim 2, characterized in that, The measuring direction of the first inclinometer is parallel to the elongation direction of the first lapped steel bar (11), with the top opening as the reference point.

6. The method for detecting the lap length of reinforcing bars in a diaphragm wall as described in claim 1, characterized in that, The calculation of the lap length of the reinforcing bars at different depths in the first trench segment (1) and the second trench segment (2) based on the displacement deviation and the lap length of the top reinforcing bar includes: Obtain the displacement deviation of the first lapped steel bar (11) of the first trench segment (1) at different depths from the top opening. ; Obtain the displacement deviation x´ of the second lapped steel bar (21) of the second groove segment (2) at different depths from the top opening; Obtain the lap length a0 of the top rebar; The lap length of the reinforcing bars in the first trench segment (1) and the second trench segment (2) at different depths is calculated using the following formula: Among them, the displacement deviation in the direction of the second groove segment (2) is positive.

7. The method for detecting the lap length of reinforcing bars in a diaphragm wall as described in claim 1, characterized in that, When measuring displacement deviation, multiple measurement points are set according to the total detection depth.

8. The method for detecting the lap length of reinforcing bars in a diaphragm wall as described in claim 7, characterized in that, Along the depth direction, the intervals between adjacent measurement points are the same.

9. A method for detecting the lap length of reinforcing bars in a diaphragm wall as described in claim 1, characterized in that, The method for detecting the lap length of the reinforcing bars in the diaphragm wall also includes: The lap length of the reinforcing bars in the first trench segment (1) and the second trench segment (2) at different depths is compared with the design threshold. If the value is not within the design threshold, adjustments will be made until the design threshold is reached.

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