Deformation testing device and method for underground diaphragm wall of deep trunk

Abstract

The invention relates to the technical field of underground engineering, in particular to a deep trunk underground diaphragm wall deformation testing device which comprises a reinforcement cage body, a middle strain optical fiber and a temperature correction optical fiber, and the middle strain optical fiber and the temperature correction optical fiber are laid on the side face of the reinforcement cage body and fixedly connected with the reinforcement cage body in a binding mode. A first strain optical fiber and a second strain optical fiber are laid on the outer wall of the reinforcement cage body on the outer sides of the middle strain optical fiber and the temperature correction optical fiber, and an upper horizontal optical fiber and a lower horizontal optical fiber are laid on the side surface of the reinforcement cage body; the temperature correction optical fiber detects the temperature of the continuous wall and is used for correcting underground temperature data, and deformation detection is performed through the first strain optical fiber, the middle strain optical fiber, the lower horizontal optical fiber, the second strain optical fiber and the upper horizontal optical fiber, so that deformation of the continuous wall in the horizontal direction and the vertical direction can be detected. And the detection precision is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering, and in particular to a device and method for testing deformation of underground continuous walls of deep enclosure wells. Background Art

[0002] The underground continuous wall is a foundation project that uses a trenching machine on the ground to dig a long and narrow deep trench along the peripheral axis of the deep excavation project under the condition of mud wall protection. After the trench is cleared, a steel cage is suspended in the trench, and then underwater concrete is poured using the conduit method to form a unit trench section. This process is carried out section by section, and finally a continuous reinforced concrete wall is built underground to serve as a water interception, anti-seepage, and load-bearing and water retaining structure.

[0003] When conducting pressure tests, traditional underground continuous wall soil pressure testing devices usually use digital frequency meters to read and record the frequency of soil pressure gauges to complete the pressure test of the wall soil. However, traditional test data is not accurate. First, multiple tests are required, and then data analysis is performed. This process will affect the accuracy of the wall soil pressure test data. Secondly, during the use of the current deformation testing device, multiple positioning and release operations are required, which affects the efficiency of on-site operations.

[0004] In view of the problems exposed during current use, it is necessary to improve and optimize the underground continuous wall deformation testing device and method. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a deformation testing device and method for underground continuous walls of deep enclosure wells, which are easy to operate for on-site personnel and convenient for deformation testing of continuous walls.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a deep underground continuous wall deformation testing device, comprising a steel cage body and a middle strain optical fiber and a temperature correction optical fiber laid on the side of the steel cage body, wherein the middle strain optical fiber and the temperature correction optical fiber are vertically laid on the outer wall of the steel cage body, and the middle strain optical fiber and the temperature correction optical fiber are both tied and fixedly connected to the steel cage body, and the middle strain optical fiber and the temperature correction optical fiber are arranged in parallel, and a first strain optical fiber and a second strain optical fiber are also laid on the outer side of the middle strain optical fiber and the temperature correction optical fiber on the outer wall of the steel cage body, and an upper horizontal optical fiber and a lower horizontal optical fiber are also laid on the side of the steel cage body, and an optical fiber protection tube is also arranged on the steel cage body, and the first strain optical fiber, the middle strain optical fiber, the temperature correction optical fiber, the second strain optical fiber, and the upper horizontal optical fiber all pass through the optical fiber protection tube and are connected to a data receiving device arranged on the surface.

[0007] As a preferred technical solution of a deep well underground continuous wall deformation testing device and method of the present invention, a plurality of positioning columns are fixedly provided on the side of the steel cage body, and each strain optical fiber can be positioned by the positioning columns when laid.

[0008] As a preferred technical solution of a deep underground continuous wall deformation testing device of the present invention, the lower horizontal optical fiber and the upper horizontal optical fiber form a group, and the first strain optical fiber and the second strain optical fiber form a group. When multiple groups of steel cage bodies are arranged in the groove, the lower horizontal optical fiber and the upper horizontal optical fiber can be positioned to the same height and laid by positioning columns.

[0009] As a preferred technical solution of a deep well underground continuous wall deformation testing device of the present invention, the middle strain optical fiber adopts a micro-armored strain sensing optical fiber with a metal tube in the center.

[0010] As a preferred technical solution of a method for testing deformation of underground continuous wall of a deep enclosure well of the present invention, the method comprises the following steps: Step 1: Determine the position of the positioning column on the steel cage body, lay the first strain optical fiber, the middle strain optical fiber, the temperature correction optical fiber, the second strain optical fiber, the lower horizontal optical fiber and the upper horizontal optical fiber on the side of the steel cage body; and tie and fix the optical fiber to the steel cage body; Step 2: Connect one end of the optical fiber in the above step to a data receiving device on the surface; Step 3: Place the steel cage body in the appropriate position in the trench, pour concrete and wait for it to solidify; Step 4: Read the corresponding measurement data from the data receiving device on the surface.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: during the actual construction process of the technical solution, positioning is performed through positioning columns, which makes it convenient for workers to install optical fibers. When several spaced steel cage bodies need to be installed in the groove, the lower horizontal optical fiber and the upper horizontal optical fiber can also be laid at the same height. After the continuous wall is cast, the lower horizontal optical fiber and the upper horizontal optical fiber can be solidified in the concrete to remain stable, which is convenient for workers to operate, and it is easy to obtain the deformation data of the continuous wall, and there is no need for workers to perform positioning multiple times.

[0012] The temperature correction optical fiber detects the temperature of the continuous wall and is used to correct the underground temperature data. Deformation detection is performed through the first strain optical fiber, the middle strain optical fiber, the lower horizontal optical fiber, the second strain optical fiber, and the upper horizontal optical fiber, so that the deformation of the continuous wall in the horizontal and vertical directions can be detected, effectively improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the continuous wall construction structure in the present invention.

[0016] In the figure: 1. steel cage body; 2. first strain optical fiber; 3. middle strain optical fiber; 4. temperature correction optical fiber; 5. lower horizontal optical fiber; 6. positioning column; 7. second strain optical fiber; 8. optical fiber protection tube; 9. upper horizontal optical fiber. DETAILED DESCRIPTION

[0017] 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example like Figure 1-2 As shown, a deformation testing device for underground continuous wall of a deep enclosure well disclosed in the present invention comprises a steel cage body 1 and a middle strain optical fiber 3 and a temperature correction optical fiber 4 laid on the side of the steel cage body 1, the middle strain optical fiber 3 and the temperature correction optical fiber 4 are vertically laid on the outer wall of the steel cage body 1, and the middle strain optical fiber 3 and the temperature correction optical fiber 4 are tied and fixedly connected to the steel cage body 1, and the middle strain optical fiber 3 and the temperature correction optical fiber 4 are arranged in parallel, and the first strain optical fiber 2 and the second strain optical fiber 7 are also laid on the outer side of the middle strain optical fiber 3 and the temperature correction optical fiber 4 on the outer wall of the steel cage body 1, and the upper horizontal optical fiber 9 and the lower horizontal optical fiber 5 are also laid on the side of the steel cage body 1, and an optical fiber protection tube 8 is also arranged on the steel cage body 1, and the first strain optical fiber 2, the middle strain optical fiber 3, the temperature correction optical fiber 4, the second strain optical fiber 7, and the upper horizontal optical fiber 9 all pass through the optical fiber protection tube 8 and are connected to a data receiving device arranged on the surface.

[0019] During the implementation of this technical solution, steel structures such as the ground-connected wall steel cage and positioning frame can also be used to tie the distributed optical fiber to the vertical steel bars of the steel cage at the corresponding position along the depth direction of the ground-connected wall to form a measurement loop at the bottom of the wall.

[0020] Among them, one of the optical fiber protection tubes 8 is tied to the outside of the middle vertical reinforcement, and the remaining optical fibers are tied to the inner sides of the upper, middle and lower vertical reinforcements respectively. After bundling, the cables and optical fiber leads are gathered to the outside of the slot section for temporary placement, and a temporary protection box is made to place the cable leads and optical fibers in it to prevent damage to the monitoring instruments by vehicles and other mechanical equipment during construction. After excavation and before the ring beam is cast, the slot section cables and optical fiber leads are gathered to the slot section and protected. Grooves are cut on the outside of the slot section until they reach the safe area next to the guardrail of the construction site, the cables and optical fibers are placed in the grooves, and backfilled with concrete. At the same time, a steel protection frame is built next to the guardrail to accommodate the MCU observation box and solar panels.

[0021] Specifically, a plurality of positioning posts 6 are fixedly provided on the side of the steel cage body 1. Each strain optical fiber can be positioned by the positioning posts 6 when laid. In this embodiment, the positioning posts 6 are protruding components, which facilitate the fixing of the optical fiber around them.

[0022] Specifically, the lower horizontal optical fiber 5 and the upper horizontal optical fiber 9 form a group, and the first strain optical fiber 2 and the second strain optical fiber 7 form a group. When multiple groups of steel cage bodies 1 are arranged in the groove, the lower horizontal optical fiber 5 and the upper horizontal optical fiber 9 can be positioned to the same height and laid by the positioning column 6. In this embodiment, the staff can replace optical fibers of different specifications according to on-site needs.

[0023] Specifically, the middle strain optical fiber 3 adopts a micro-armored strain sensing optical fiber with a metal tube in the center. The strain sensing optical fiber used in this embodiment has a diameter of 3.5 mm and a weight of 19 kg / km; a maximum tensile strength of 700 N during installation; a maximum compressive strength of 800 N / cm; an attenuation of ≤0.4 Db / km; a Brillouin parameter temperature sensitivity of 1.1 MHz / K, a strain sensitivity of 4501.1 MHz / %, and a central Brillouin frequency of 10.6 GHz.

[0024] Working principle and use process of the present invention: The present invention includes the following steps: Step 1: Determine the position of the positioning column 6 on the steel cage body 1, lay the first strain optical fiber 2, the middle strain optical fiber 3, the temperature correction optical fiber 4, the second strain optical fiber 7, the lower horizontal optical fiber 5 and the upper horizontal optical fiber 9 on the side of the steel cage body 1; and tie and fix the optical fiber to the steel cage body 1; Step 2: Connect one end of the optical fiber in the above step to a data receiving device on the surface; Step 3: Place the steel cage body 1 at a suitable position in the groove, pour concrete and wait for solidification; Step 4: Read the corresponding measurement data from the data receiving device on the surface.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to be a further limitation of the present invention. All equivalent changes made using the contents of the present specification and drawings are within the protection scope of the present invention.

Claims

1. A deformation testing device for underground continuous wall of deep enclosure well, characterized by: The invention comprises a steel cage body (1) and a middle strain optical fiber (3) and a temperature correction optical fiber (4) laid on the side of the steel cage body (1), wherein the middle strain optical fiber (3) and the temperature correction optical fiber (4) are laid vertically on the outer wall of the steel cage body (1), and the middle strain optical fiber (3) and the temperature correction optical fiber (4) are tied and fixedly connected to the steel cage body (1), and the middle strain optical fiber (3) and the temperature correction optical fiber (4) are arranged in parallel, and the middle strain optical fiber (3) and the temperature correction optical fiber (4) are located outside the middle strain optical fiber (3) and the temperature correction optical fiber (4). The outer wall of the steel cage body (1) is also provided with a first strain optical fiber (2) and a second strain optical fiber (7); an upper horizontal optical fiber (9) and a lower horizontal optical fiber (5) are also provided on the side of the steel cage body (1); an optical fiber protection tube (8) is also provided on the steel cage body (1); the first strain optical fiber (2), the middle strain optical fiber (3), the temperature correction optical fiber (4), the second strain optical fiber (7), and the upper horizontal optical fiber (9) all pass through the optical fiber protection tube (8) and are connected to a data receiving device provided on the ground surface.

2. A deep well underground continuous wall deformation testing device according to claim 1, characterized in that: A plurality of positioning columns (6) are also fixedly provided on the side of the steel cage body (1), and each strain optical fiber can be positioned by the positioning columns (6) when being laid.

3. A deep well underground continuous wall deformation testing device according to claim 2, characterized in that: The lower horizontal optical fiber (5) and the upper horizontal optical fiber (9) form a group, and the first strain optical fiber (2) and the second strain optical fiber (7) form a group. When a plurality of groups of steel cage bodies (1) are arranged in the groove, the lower horizontal optical fiber (5) and the upper horizontal optical fiber (9) can be positioned to the same height and laid by means of a positioning column (6).

4. A deep well underground continuous wall deformation testing device according to claim 1, characterized in that: The middle strain optical fiber (3) is a micro-armored strain sensing optical fiber with a metal tube in the center.

5. The method for testing the deformation of underground continuous wall of a deep well according to claim 1, characterized in that: The following steps are involved: Step 1: Determine the position of the positioning column (6) on the steel cage body (1), and lay the first strain optical fiber (2), the middle strain optical fiber (3), the temperature correction optical fiber (4), the second strain optical fiber (7), the lower horizontal optical fiber (5) and the upper horizontal optical fiber (9) on the side of the steel cage body (1); and tie and fix the optical fiber to the steel cage body (1); Step 2: Connect one end of the optical fiber in step 1 to a data receiving device on the surface; Step 3: Place the steel cage body (1) at a suitable position in the groove, pour concrete and wait for it to solidify; Step 4: Read the corresponding measurement data from the data receiving device on the surface.

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