Pressure box structure device capable of being pre-tightened

Abstract

The utility model belongs to the technical field of pressure box devices, and particularly relates to a pre-tightening type pressure box structure device which comprises a horizontally-arranged bottom supporting plate, a plurality of vertically-upward expansion bolts and a plurality of pre-tightening devices. The protective cover is placed in the middle of the top of the bottom supporting plate; the soil pressure box is placed in the protective cover, a pre-tightening hoop is fixed to the outer wall of the soil pressure box, and a plurality of pre-tightening fixing pieces are fixed to the outer wall of the pre-tightening hoop; and the jacking plate is placed at the bottom of the earth pressure box and is positioned in the protective cover. According to the utility model, the bottom supporting plate, the earth pressure box, the protective cover and other components on the bottom supporting plate can be fixed at the to-be-measured point of the tunnel surrounding rock by virtue of the expansion bolts, the application range is wide, the operation can be carried out in a narrow space, the operation is simple and convenient, the actual construction environment is met, and the cost is lower; in addition, by arranging the protective cover, the influence of side pressure concrete on the pressure box can be reduced, and data collected by the soil pressure box are more accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure box devices, and in particular relates to a pre-tightened pressure box structure device. Background Art

[0002] Pressure boxes are instruments used to monitor medium stress data in tunnel projects, as well as to measure contact stress between surrounding rock and supporting structure, and between shotcrete and cast-in-place concrete. During tunnel construction, soil pressure needs to be tested. After the construction is completed, soil pressure boxes are also needed to test soil pressure. To determine whether it is qualified, soil pressure box burial devices are needed.

[0003] The earth pressure box needs to be kept vertical during the burial process to ensure the accuracy of the measurement. In the actual burial process, it is necessary to drill holes for burial. It is impossible to directly observe whether the earth pressure box is in a vertical state, nor can it determine the direction of the measuring surface of the earth pressure box. When filling the burial hole, there is a lack of corresponding protection measures for the earth pressure box. The landfill material falling on the earth pressure box may cause the earth pressure box to tilt, resulting in a large deviation in the data measurement.

[0004] In the prior art, there are devices for installing and protecting pressure boxes, such as CN212458737U, which discloses a pressure box installation and protection device for monitoring contact pressure in tunnels, including a base tray, a bearing positioning rod, a bearing box, a pressure box and a wire. The base tray is provided with a wire hole, the lower end surface of the base tray is connected to the bearing positioning rod, the lower end surface of the bearing box is connected to the upper end surface of the base tray by bolts, the pressure box is embedded in the bearing box, the side surface is slidably connected to the inner surface of the side wall of the bearing box, and the guide is embedded in the bearing positioning rod, and one end is connected to the pressure box, and the other end is located outside the bearing positioning rod. The pressure box installation and protection device disclosed in this patent effectively reduces the difficulty of installation and construction work, and the installation and positioning method is flexible, the positioning is accurate, the bearing capacity is strong, and it is not easy to be misplaced, which effectively solves the problem of tunnel over-excavation installation; in addition, it can effectively reduce the lateral force on the pressure box during operation and improve the accuracy of tunnel pressure detection. It is undeniable that the pressure box installation protection device disclosed in the patent can indeed achieve the above-mentioned effect, but it still has certain shortcomings. It needs to prefabricate the load-bearing positioning rods corresponding to the surrounding rock excavation conditions and the grid steel frame erection conditions at the measured location. Its application scope is limited and it will increase the monitoring cost. In addition, it has many parts, which will make the construction more troublesome to a certain extent.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0006] The utility model aims to provide a pre-tightened pressure box structure device to solve the problem of pressure box installation protection device in tunnel contact pressure monitoring in the background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A pre-tightening pressure box structure device, comprising:

[0009] A horizontally arranged bottom support plate, wherein a plurality of vertically upward expansion bolts are arranged on the bottom support plate;

[0010] A protective cover is placed in the middle of the top of the bottom support plate, and the protective cover is a hollow structure with an opening at the bottom;

[0011] An earth pressure box is placed in the protective cover, a pre-tightening hoop is fixed on the outer wall of the earth pressure box, a plurality of pre-tightening fixing plates are evenly fixed on the outer wall of the pre-tightening hoop, and the pre-tightening hoop is fixed on the bottom support plate by using pre-tightening bolts penetrating the pre-tightening fixing plates;

[0012] A top support plate is placed at the bottom of the earth pressure box and is located within the protective cover.

[0013] Preferably, the expansion bolts are arranged at the four corners of the bottom support plate; and first bolt holes corresponding to the expansion bolts are opened on the bottom support plate.

[0014] Preferably, a plurality of spring sheets are sleeved on the bolt rod of the expansion bolt located below the bottom support plate; and a fastening nut is threadedly connected on the bolt rod of the expansion bolt located below the plurality of spring sheets.

[0015] Preferably, the number of the expansion bolts and the pre-tightening fixing plates is four.

[0016] Preferably, a clearance groove corresponding to the pre-tightening fixing plate is provided at the bottom of the side wall of the protective cover.

[0017] Preferably, an adjusting bolt is threadedly connected to the bottom of the bottom supporting plate; when the adjusting bolt is tightened, the inner end of the adjusting bolt abuts against the top supporting plate.

[0018] Preferably, the top of the earth pressure box is in contact with the top wall of the protective cover.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model can fix the bottom support plate and the earth pressure box and protective cover on the bottom support plate to the test point of the tunnel surrounding rock with the help of expansion bolts. It has a wide range of applications and can be operated in a narrow space. It is simple and convenient, conforms to the actual construction environment, and has low cost. In addition, by setting the protective cover, the influence of the lateral pressure concrete on the pressure box can be reduced, so that the data collected by the earth pressure box is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a state diagram of the device of the utility model;

[0022] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 3 for Figure 2 The main view;

[0024] Figure 4 for Figure 2 Exploded diagram.

[0025] Description of main reference numerals:

[0026] 1. Bottom support plate; 11. First bolt;

[0027] 2. Expansion bolt; 21. Spring sheet; 22. Fastening nut;

[0028] 3. Protective cover; 31. Give way slot;

[0029] 4. Earth pressure cell;

[0030] 5. Pre-tightening hoop; 51. Pre-tightening fixing plate;

[0031] 6. Pre-tighten the bolts;

[0032] 7. Top support plate;

[0033] 8. Adjust the bolt;

[0034] 9. Tunnel surrounding rock. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solution of the utility model patent. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Example

[0037] See attached Figure 1-4, a pre-tightening pressure box structure device, comprising:

[0038] A bottom support plate 1 is arranged horizontally, and a plurality of expansion bolts 2 are arranged vertically upward on the bottom support plate 1; in this embodiment, the expansion bolts 2 are arranged at four corners of the bottom support plate 1; and first bolt holes 11 corresponding to the expansion bolts 2 are opened on the bottom support plate 1;

[0039] A protective cover 3 is placed in the middle of the top of the bottom support plate 1, and the protective cover 3 is a hollow structure with an opening at the bottom;

[0040] The earth pressure box 4 is placed in the protective cover 3, and the top of the earth pressure box 4 is in contact with the top wall of the protective cover 3; a pre-tightening hoop 5 is fixed on the bottom of the outer wall of the earth pressure box 4, and a plurality of pre-tightening fixing plates 51 are evenly fixed on the outer wall of the pre-tightening hoop 5, and the pre-tightening bolt 6 is used to penetrate the pre-tightening fixing plate 51 to fix the pre-tightening hoop 5 on the bottom support plate 1; it should be supplemented here that the pre-tightening fixing plate 51 extends out of the protective cover 3, the pre-tightening bolt 6 is located on the outside of the protective cover 3, and a clearance groove 31 corresponding to the pre-tightening fixing plate 51 is opened at the bottom of the side wall of the protective cover 3;

[0041] A top support plate 7 is placed at the bottom of the earth pressure box 4 and located inside the protective cover 3 .

[0042] In this embodiment, a plurality of spring sheets 21 are sleeved on the bolt rod of the expansion bolt 2 located below the bottom support plate 1 ; a fastening nut 22 is threadedly connected on the bolt rod of the expansion bolt 2 located below the plurality of spring sheets 21 .

[0043] In addition, in this embodiment, the number of expansion bolts 2 and pre-tightening fixing sheets 51 is four.

[0044] Secondly, in this embodiment, an adjusting bolt 8 is threadedly connected to the bottom of the bottom supporting plate 1 ; when the adjusting bolt 8 is tightened, the inner end of the adjusting bolt 8 abuts against the top supporting plate 7 .

[0045] When in use, a hole corresponding to the first bolt hole 11 on the bottom support plate 1 is drilled on the tunnel surrounding rock 9 with the help of a drilling machine, and the top of the expansion bolt 2 is inserted and fixed in the hole. The top support plate 7 is placed on the bottom support plate 1, and then the earth pressure box 4 is placed on the top support plate 7, and then the pre-tightening bolt 6 is used to penetrate the pre-tightening fixing sheet 51 on the pre-tightening hoop 5 to fix the pre-tightening hoop 5 on the bottom support plate 1, and then the earth pressure box 4 is fixed on the bottom support plate 1. The protective cover 3 is covered on the earth pressure box 4, and the top of the earth pressure box 4 is attached to the top wall of the protective cover 3.

[0046] The first bolt hole 11 on the bottom support plate 1 is passed through the bottom of the expansion bolt 2, different numbers of spring sheets 21 are sleeved on the expansion bolt 2, and then the pre-tightening nut 22 is tightened, and the top of the protective cover 3 is attached to the tunnel surrounding rock 9. When the tunnel surrounding rock 9 is deformed by force, the deformation is transmitted to the protective cover 3, which in turn causes the protective cover 3 to deform. The deformation of the protective cover 3 is then transmitted to the earth pressure box 4, thereby realizing data collection. It should be supplemented here that the tunnel surrounding rock 9 may sometimes be uneven. By adjusting the number of spring sheets 21 on the expansion bolt 2 at different positions, the uneven position can be adjusted, so that the data collected by the earth pressure box 4 is more accurate.

[0047] In addition, when the adjusting bolt 8 is tightened, the inner end of the adjusting bolt 8 abuts against the top supporting plate 7 and generates an upward force on the top supporting plate 7. The top supporting plate 7 transmits the force to the earth pressure box 4, thereby dynamically adjusting the value of the earth pressure box 4.

[0048] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. A pre-tightening pressure box structure device, characterized in that: include: A horizontally arranged bottom support plate, wherein a plurality of vertically upward expansion bolts are arranged on the bottom support plate; A protective cover is placed in the middle of the top of the bottom support plate, and the protective cover is a hollow structure with an opening at the bottom; An earth pressure box is placed in the protective cover, a pre-tightening hoop is fixed on the outer wall of the earth pressure box, a plurality of pre-tightening fixing plates are evenly fixed on the outer wall of the pre-tightening hoop, and the pre-tightening hoop is fixed on the bottom support plate by using pre-tightening bolts penetrating the pre-tightening fixing plates; A top support plate is placed at the bottom of the earth pressure box and is located within the protective cover.

2. The pre-tightening pressure box structure device according to claim 1 is characterized in that: The expansion bolts are arranged at the four corners of the bottom support plate; and first bolt holes corresponding to the expansion bolts are provided on the bottom support plate.

3. The pre-tightening pressure box structure device according to claim 2, characterized in that: A plurality of spring sheets are sleeved on the bolt rod of the expansion bolt located below the bottom support plate; a fastening nut is threadedly connected on the bolt rod of the expansion bolt located below the plurality of spring sheets.

4. The pre-tightening pressure box structure device according to claim 1, characterized in that: The number of the expansion bolts and the pre-tightening fixing plates is 4.

5. The pre-tightening pressure box structure device according to claim 1, characterized in that: A clearance groove corresponding to the pre-tightening fixing sheet is formed at the bottom of the side wall of the protective cover.

6. The pre-tightened pressure box structure device according to claim 1, characterized in that: The bottom of the bottom supporting plate is threadedly connected with an adjusting bolt; when the adjusting bolt is tightened, the inner end of the adjusting bolt abuts against the top supporting plate.

7. The pre-tightened pressure box structure device according to claim 1, characterized in that: The top of the earth pressure box is in contact with the top wall of the protective cover.

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