Pressure box fixing device for primary support-secondary lining contact pressure monitoring

Abstract

The utility model relates to the technical field of engineering construction monitoring, and discloses a pressure box fixing device for primary support-secondary lining contact pressure monitoring, which comprises a concrete surface and a waterproof plate, the waterproof plate is provided with a plurality of mounting holes, fasteners are arranged in the mounting holes, the waterproof plate is mounted on the concrete surface through the fasteners, and the waterproof plate is fixed on the concrete surface through the fasteners. A pressure box mechanism is arranged between the concrete surface and the waterproof plate sheet, the pressure box mechanism comprises a pressure box body, a lead, a frequency reading instrument and a fixing clamp, and the side edge of the pressure box body is connected with the lead; according to the utility model, the pressure box body can be quickly fixed between the waterproof plate sheet and the concrete surface by utilizing the waterproof plate sheet, the installation method is simple and quick, and meanwhile, the pressure box body can be easily positioned in the middle of the waterproof plate sheet and is more stable when being fixed by utilizing the matching of the arc-shaped positioning plate and the clamping mechanism; and adjustment by a worker is not needed, so that the convenience of fixing the pressure box body is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering construction monitoring, and more specifically, to a pressure box fixing device used for primary support-secondary lining contact pressure monitoring. Background Art

[0002] When encountering complex geological conditions in underground projects such as tunnels, composite lining structures are generally used, that is, steel support + sprayed anchor as the primary support, and cast reinforced concrete as the secondary lining. In order to determine how the load is transferred between the primary support and the secondary lining, and to better evaluate the safety of the secondary lining, it is necessary to monitor the contact pressure between the primary support and the secondary lining of the tunnel in real time, that is, to monitor the pressure through the contact pressure measuring equipment of the primary support and the secondary lining of the tunnel. The usual practice is to weld the pressure box directly on the secondary lining steel bar, and the pressure box measurement value can approximately reflect the contact pressure between the primary support and the secondary lining.

[0003] When fixing the pressure box now, the staff will use the waterproof board to fix the pressure box between the waterproof board and the concrete surface. At this time, the pressure box is tightly attached to the waterproof board and the concrete surface. However, this fixing method is mostly to install some nails on the waterproof board first, and then place the pressure box on the back side of the waterproof board. At this time, the staff is required to adjust the position of the pressure box so that it is located in the center of the waterproof board. At the same time, the pressure box may move during the installation of the remaining nails, resulting in a position offset, which increases the difficulty of installing the pressure box. Utility Model Content

[0004] The utility model provides a pressure box fixing device for primary support-secondary lining contact pressure monitoring, which solves the technical problem in the related art that the pressure box needs to be position adjusted during installation.

[0005] The utility model provides a pressure box fixing device for primary support-secondary lining contact pressure monitoring, comprising a concrete surface and a waterproof plate, wherein a plurality of mounting holes are opened on the waterproof plate, nails are arranged in the mounting holes, and the waterproof plate is mounted on the concrete surface by the nails, and a pressure box mechanism is arranged between the concrete surface and the waterproof plate, and the pressure box mechanism comprises a pressure box body, a lead, a frequency reader and a fixing clamp.

[0006] Furthermore, the pressure box body is placed between the waterproof sheet and the concrete surface and is located in the exact center of the waterproof sheet. A lead is connected to the side edge of the pressure box body, and a frequency reader is connected to one end of the lead away from the pressure box body. A plurality of fixing clips are provided on the lead.

[0007] Furthermore, the waterproof sheet is made of EVA waterproof board, and the contact surface between the concrete surface and the waterproof sheet and the pressure box body are all horizontal and parallel.

[0008] Furthermore, the pressure box body is made of steel and is cylindrical, the diameter of the pressure box body is 8cm-12cm, the thickness of the pressure box body is 3cm-4cm, and the weight of the pressure box body is 1kg-3kg.

[0009] Furthermore, a curved positioning plate is provided on one side of the concrete surface close to the waterproof sheet, the outer side of the pressure box body is fitted with the inner side of the curved positioning plate, and the height of the curved positioning plate is smaller than the height of the pressure box body.

[0010] Furthermore, the upper end of the arc-shaped positioning plate is provided with two symmetrically distributed grooves, and a clamping mechanism is provided in the grooves;

[0011] The clamping mechanism includes a cross bar, a slider, a clamping plate and a spring. The cross bar is arranged in the groove, the slider is slidably arranged on the cross bar, the clamping plate is arranged at the upper end of the slider, one side of the clamping plate abuts against the outer side of the pressure box body, the spring is sleeved on the outer side of the cross bar, and the two ends of the spring are respectively connected to the inner wall of the groove and the slider, and the height of the clamping plate is less than the height of the pressure box body.

[0012] Furthermore, a wire threading groove is provided at the bottom end of the arc-shaped positioning plate, and one end of the lead wire away from the pressure box body passes through the wire threading groove.

[0013] Furthermore, an upper end of the clamping plate on one side close to the pressure box body is sloped.

[0014] The beneficial effects of the utility model are:

[0015] The utility model provides a waterproof plate, an arc-shaped positioning plate, a clamping mechanism and a wire threading groove. When fixing the pressure box body, the mounting hole of the waterproof plate in the middle position is aligned with the arc-shaped positioning plate. Then, the pressure box body can be quickly fixed between the waterproof plate and the concrete surface by using the waterproof plate. The installation method is simple and quick. At the same time, the cooperation of the arc-shaped positioning plate and the clamping mechanism can make the pressure box body easily located in the center position of the waterproof plate when fixed and more stable, without the need for staff to adjust. Moreover, since the notch of the wire threading groove is larger, the lead wire on the pressure box body can be more easily passed through the wire threading groove, which further improves the convenience of fixing the pressure box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of Embodiment 1 of the present utility model;

[0017] Figure 2 This is an axial view of the tunnel after the pressure box body is fixed in Example 1 of the utility model;

[0018] Figure 3 It is a structural schematic diagram of Embodiment 2 of the present utility model;

[0019] Figure 4 It is a schematic diagram of the explosion structure of Example 2 of the utility model;

[0020] Figure 5 It is a schematic diagram of the local structure in Embodiment 2 of the present utility model;

[0021] Figure 6 It is a schematic cross-sectional view of the arc-shaped positioning plate in Embodiment 2 of the present utility model;

[0022] Figure 7 yes Figure 6 A magnified schematic diagram of the structure of part A.

[0023] In the figure: 1. concrete surface; 2. waterproof sheet; 3. mounting hole; 4. nail; 5. pressure box mechanism; 501. pressure box body; 502. lead wire; 503. frequency reader; 504. fixing clamp; 6. arc positioning plate; 7. groove; 8. clamping mechanism; 801. cross bar; 802. slider; 803. clamping plate; 804. spring; 9. wire threading groove. DETAILED DESCRIPTION

[0024] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0025] Example 1

[0026] like Figure 1-Figure 3 As shown, this embodiment provides a pressure box fixing device for primary support-secondary lining contact pressure monitoring, including a concrete surface 1 and a waterproof sheet 2, a plurality of mounting holes 3 are opened on the waterproof sheet 2, nails 4 are arranged in the mounting holes 3, the waterproof sheet 2 is installed on the concrete surface 1 through the nails 4, a pressure box mechanism 5 is arranged between the concrete surface 1 and the waterproof sheet 2, and the pressure box mechanism 5 includes a pressure box body 501, a lead 502, a frequency reader 503 and a fixing clamp 504.

[0027] The pressure box body 501 is placed between the waterproof sheet 2 and the concrete surface 1 and is located at the exact center of the waterproof sheet 2. A lead wire 502 is connected to the side edge of the pressure box body 501. A frequency reader 503 is connected to one end of the lead wire 502 away from the pressure box body 501. A plurality of fixing clips 504 are provided on the lead wire 502.

[0028] It should be noted that the distance between the two corresponding fixing clips 504 does not exceed 0.8 m, and the lead wire 502 should extend obliquely backwards with an angle of 75° with the longitudinal direction of the tunnel.

[0029] The waterproof sheet 2 is made of EVA waterproof board, and the contact surfaces of the concrete surface 1 and the waterproof sheet 2 with the pressure box body 501 are all horizontal and parallel.

[0030] It should be noted that the waterproof sheet 2 should be approximately square, with a side length of about 40 cm, and the distance between the nail 4 and the edge of the waterproof sheet 2 should be 5 cm-8 cm.

[0031] The pressure box body 501 is made of steel and is cylindrical. The diameter of the pressure box body 501 is 8cm-12cm, the thickness of the pressure box body 501 is 3cm-4cm, and the weight of the pressure box body 501 is 1kg-3kg.

[0032] Example 2

[0033] like Figure 4-Figure 7 As shown, this embodiment provides a pressure box fixing device for primary support-secondary lining contact pressure monitoring, and also includes an arc-shaped positioning plate 6 arranged on the side of the concrete surface 1 close to the waterproof plate 2, the outer side of the pressure box body 501 is fitted with the inner side of the arc-shaped positioning plate 6, and the height of the arc-shaped positioning plate 6 is less than the height of the pressure box body 501.

[0034] It should be noted that when installing the pressure box body 501, first align the mounting hole 3 in the middle position of the waterproof sheet 2 with the arc-shaped positioning plate 6, and then use a nail gun to first install the three nails 4 at the lower end, and then install the two nails 4 on the right side, and then insert the pressure box body 501 from the middle of the back of the waterproof sheet 2, so that the pressure box body 501 is placed on the inner side of the arc-shaped positioning plate 6. At this time, the pressure box body 501 is located in the center of the waterproof sheet 2, and there is no need to adjust the position of the pressure box body 501.

[0035] The upper end of the arc-shaped positioning plate 6 is provided with two symmetrically distributed grooves 7, and a clamping mechanism 8 is provided in the groove 7;

[0036] The clamping mechanism 8 includes a cross bar 801, a slider 802, a clamping plate 803 and a spring 804. The cross bar 801 is arranged in the groove 7. The slider 802 is slidably arranged on the cross bar 801. The clamping plate 803 is arranged at the upper end of the slider 802. One side of the clamping plate 803 abuts against the outer side of the pressure box body 501. The spring 804 is sleeved on the outer side of the cross bar 801, and the two ends of the spring 804 are respectively connected to the inner wall of the groove 7 and the slider 802. The height of the clamping plate 803 is less than the height of the pressure box body 501.

[0037] It should be noted that in the process of placing the pressure box body 501 on the inner side of the arc-shaped positioning plate 6, the pressure box body 501 slides along the two clamping plates 803, which not only makes the pressure box body 501 more stable when placed, but also after the pressure box body 501 is placed, the pressure box body 501 can be clamped by the spring 804 and the clamping plate 803. Then, the pressure box body 501 is not easy to shake after being placed, which further improves the convenience of installing the pressure box body 501.

[0038] A wire threading groove 9 is formed at the bottom end of the arc-shaped positioning plate 6 , and one end of the lead wire 502 away from the pressure box body 501 passes through the wire threading groove 9 .

[0039] It should be noted that, since the slot of the wire threading groove 9 is relatively large, the lead wire 502 on the pressure box body 501 can be more easily passed through the wire threading groove 9, which further improves the convenience of placing the pressure box body 501 on the arc-shaped positioning plate 6.

[0040] The upper end of the clamping plate 803 close to the pressure box body 501 is sloped.

[0041] It should be noted that the upper end of one side of the clamping plate 803 is in a slope shape, so that the clamping plate 803 can be easily driven to move when the pressure box body 501 contacts the clamping plate 803.

[0042] In summary, in the utility model, when fixing the pressure box body 501, first align the mounting hole 3 in the middle of the waterproof sheet 2 with the arc-shaped positioning plate 6, and then use a nail gun to first install the three nails 4 at the lower end, and then install the two nails 4 on the right side, and then put the pressure box body 501 in the middle of the back of the waterproof sheet 2. At this time, the pressure box body 501 will squeeze the two clamping plates 803, and the clamping plates 803 will be squeezed to drive the slider 802 to slide on the cross bar 801 to squeeze the spring 804. Then, after the pressure box body 501 is placed on the inner side of the arc-shaped positioning plate 6, the spring 804 and the clamping plate 803 can be used to stably clamp the pressure box body 501, and the pressure box body 501 is located in the center of the waterproof sheet 2, so there is no need to fix the pressure box body 50 1 is adjusted, and the pressure box body 501 is in close contact with the waterproof sheet 2 and the concrete surface 1, and then the two nails 4 on the left are installed to complete the fixation of the pressure box body 501, and then the fixing clamp 504 fixes the lead wire 502 every 0.8m, so that the lead wire 502 goes down along the tunnel wall. When the lead wire 502 reaches the tunnel arch foot, it should continue to extend for about 2m. The copper wire is pulled out of the tail end of the lead wire 502 with a tool pliers, and the red line and the black line are pulled out of the copper wire by about 3cm each, and connected to the frequency reader 503. After the cross-section geotextile and the waterproof sheet 2 are laid, the waterproof sheet 2 cannot cover the lead wire 502, and the tail should extend more than 1m. The frequency reader 503 is used to record the initial frequency. After the mold-cast concrete is poured, the frequency is measured once a day, and the time-course curve of the change of the primary support-secondary lining contact pressure can be obtained through the frequency conversion pressure value formula. The method of converting frequency into pressure value is as follows:

[0043]

[0044] Where: K—calibration coefficient of pressure cell, MPa / Hz 2 ;

[0045] f—measured frequency, Hz;

[0046] f0—initial frequency, Hz.

[0047] The time history curve of primary support-secondary lining contact pressure change can be obtained through the frequency conversion pressure value formula.

[0048] The above describes an embodiment of the present utility model, but this embodiment is not limited to the above-mentioned specific implementation mode. The above-mentioned specific implementation mode is merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make more forms of equivalent embodiments, all of which are protected by this embodiment.

Claims

1. A pressure box fixing device, characterized in that: The invention comprises a concrete surface (1) and a waterproof sheet (2), wherein a plurality of mounting holes (3) are provided on the waterproof sheet (2), nails (4) are arranged in the mounting holes (3), the waterproof sheet (2) is mounted on the concrete surface (1) by means of the nails (4), a pressure box mechanism (5) is arranged between the concrete surface (1) and the waterproof sheet (2), and the pressure box mechanism (5) comprises a pressure box body (501), a lead wire (502), a frequency reader (503) and a fixing clamp (504).

2. A pressure box fixing device according to claim 1, characterized in that: The pressure box body (501) is placed between the waterproof sheet (2) and the concrete surface (1) and is located at the exact center of the waterproof sheet (2). A lead wire (502) is connected to the side edge of the pressure box body (501). A frequency reader (503) is connected to one end of the lead wire (502) away from the pressure box body (501). A plurality of fixing clips (504) are provided on the lead wire (502).

3. A pressure box fixing device according to claim 1, characterized in that: The material of the waterproof sheet (2) is an EVA waterproof board, and the contact surfaces of the concrete surface (1) and the waterproof sheet (2) with the pressure box body (501) are all horizontal and parallel.

4. A pressure box fixing device according to claim 1, characterized in that: The pressure box body (501) is made of steel and is cylindrical. The diameter of the pressure box body (501) is 8cm-12cm. The thickness of the pressure box body (501) is 3cm-4cm. The weight of the pressure box body (501) is 1kg-3kg.

5. A pressure box fixing device according to claim 1, characterized in that: A curved positioning plate (6) is provided on one side of the concrete surface (1) close to the waterproof sheet (2); the outer side of the pressure box body (501) is fitted with the inner side of the curved positioning plate (6); and the height of the curved positioning plate (6) is smaller than the height of the pressure box body (501).

6. A pressure box fixing device according to claim 5, characterized in that: The upper end of the arc-shaped positioning plate (6) is provided with two symmetrically distributed grooves (7), and a clamping mechanism (8) is arranged in the groove (7); The clamping mechanism (8) comprises a cross bar (801), a slider (802), a clamping plate (803) and a spring (804); the cross bar (801) is arranged in the groove (7); the slider (802) is slidably arranged on the cross bar (801); the clamping plate (803) is arranged at the upper end of the slider (802); one side of the clamping plate (803) abuts against the outer side of the pressure box body (501); the spring (804) is sleeved on the outer side of the cross bar (801); and the two ends of the spring (804) are respectively connected to the inner wall of the groove (7) and the slider (802); the height of the clamping plate (803) is less than the height of the pressure box body (501).

7. A pressure box fixing device according to claim 5, characterized in that: A wire threading groove (9) is formed at the bottom end of the arc-shaped positioning plate (6), and one end of the lead wire (502) away from the pressure box body (501) passes through the wire threading groove (9).

8. A pressure box fixing device according to claim 6, characterized in that: The upper end of the clamping plate (803) close to the pressure box body (501) is sloped.

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