Buoyancy detection device for water-buried tank

Abstract

The utility model relates to the technical field of buoyancy detection of water-buried tanks, and discloses a buoyancy detection device for a water-buried tank, which comprises a water pool filled with water; the tank body is installed in the water pool, the tank body is completely submerged by water, an anti-floating device is arranged at the bottom of the tank body, and the tank body is fixed to the bottom of the water pool through the anti-floating device; the cross beam is located at the position above the tank body, and the two ends of the cross beam are detachably installed on the pool wall of the pool; the pressure transmitter is installed under the middle position of the cross beam, the bottom of the pressure transmitter abuts against the middle position of the top of the tank body, and standing pressure exists between the pressure transmitter and the tank body; and the data box is used for collecting and analyzing the pressure value detected by the pressure transmitter through a cable. The buoyancy detection device for the water-buried tank has the advantages that the buoyancy of the water-buried tank in a water pool can be accurately monitored in real time, and the anti-floating device is prevented from being broken due to too high tension.

Description

Technical Field

[0001] The utility model relates to the technical field of buoyancy detection of water buried tanks, in particular to a buoyancy detection device for water buried tanks. Background Art

[0002] With the advancement of safety work, safety distance has become a major problem for stations. The advantage of underground tanks is that the safety distance is halved and the investment in fire protection systems is sharply reduced. Therefore, underground tanks have become the mainstream of current technical reforms. Water-buried tanks are easy to inspect and maintain and are particularly highly praised.

[0003] However, water-buried tanks will withstand huge buoyancy. For example, a 50-cubic-meter water-buried tank is immersed in water as a whole. Then, 50 cubic meters of water are displaced, and there will naturally be 50 tons of buoyancy. During the construction and design, the foundation is tensilely reinforced considering the buoyancy of water. The tank weighs 11 tons. Although it is made of steel, it still has 1 ton of buoyancy when immersed in water. The density of liquefied gas is 0.55. Even if it is filled with liquefied gas, it still has 20 tons of buoyancy. That is to say, the foundation tensile reinforcement structure is resisting the ever-changing buoyancy of 20-40 tons every day. The repeated alternation of stress and no stress every day will cause metal fatigue and deformation. The deformation range is very small, perhaps less than one millimeter, and the cracking only occurs in an instant. Therefore, the simple sinking and floating detection is not accurate enough and has little significance.

[0004] Patent application number CN202122266923.X discloses an anti-floating buried double-layer storage tank, including a buried pit and a buried tank body placed inside the buried pit, the two ends of the waistline of the buried tank body are rotatably connected with four equidistantly distributed T-shaped rods for flipping, the upper surface of the T-shaped rod is provided with a V-shaped clamping block for buckling, the bottom end of the T-shaped rod is fixedly connected with a buoyancy clamping assembly for buckling by buoyancy, and the side wall of the buried pit is provided with a V-shaped clamping block for buckling by buoyancy. There are V-shaped slots and gripping slots; four equally spaced T-shaped rods for flipping are rotatably connected at both ends of the waistline of the buried tank, and V-shaped blocks are provided on the upper surface of the T-shaped rods. The bottom of the T-shaped rods are fixedly connected with buoyancy buckle assemblies. When the buried pit is flooded, the floating foam is lifted by the buoyancy of the water, and the T-shaped rod is buckled with the gripping slots on the side wall of the buried pit during the lifting process. The V-shaped blocks on the upper surface of the T-shaped rod are buckled with the V-shaped slots, so that the buried tank will not float. The above technology only designs an anti-floating device for the buried tank, and lacks a buoyancy detection device for the buried tank.

[0005] By analyzing the existing technology, it was found that the water-buoyant tank has some defects: there is a lack of a device to detect the buoyancy of the water-buoyant tank; since the water-buoyant tank is located inside the pool, the uneven depth of the pool will affect the installation of the buoyancy detection device; the device is severely corroded in the pool and needs to be easily replaced and repaired. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] In view of the shortcomings of the prior art, the utility model provides a buoyancy detection device for a water-buoyed tank, which has the advantages of real-time and accurate monitoring of the buoyancy of the water-buoyed tank in the water pool and preventing the anti-buoyancy device from being subjected to excessive tension and thus breaking. It solves the problem that the water-buoyed tank is subjected to large and changing buoyancy, which easily leads to the breakage of the anti-buoyancy device.

[0008] (II) Technical solution

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A buoyancy detection device for a submerged tank, comprising:

[0011] A pool containing water;

[0012] A tank body, wherein the tank body is installed in a pool and is completely submerged in water, and an anti-floating device is provided at the bottom of the tank body, and the anti-floating device fixes the tank body at the bottom of the pool;

[0013] A crossbeam, the crossbeam is located above the tank body, and both ends of the crossbeam are detachably mounted on the pool wall of the pool;

[0014] A pressure transmitter, the pressure transmitter is installed just below the middle position of the crossbeam, the bottom of the pressure transmitter is against the middle position of the top of the tank body, and there is static pressure between the pressure transmitter and the tank body;

[0015] A pressure plate, which is installed on the top of the tank body, and the pressure transmitter is pressed against the pressure plate below. The pressure plate is used to distribute the downward pressure of the pressure transmitter to the entire tank body to avoid deformation of the tank body caused by local force;

[0016] A data box collects and analyzes the pressure value detected by the pressure transmitter through the cable.

[0017] Preferably, a lifting device is also provided on the crossbeam, the pressure transmitter is installed at the bottom of the lifting device, the pressure transmitter includes a fixing seat and a top seat at the upper and lower ends, and a sensor installed between the fixing seat and the top seat, and the lifting device includes:

[0018] A screw column, wherein a groove for installing a pressure transmitter is provided at the bottom of the screw column, and a thread is provided on the outer side of the screw column;

[0019] A nut sleeve is provided with a vertical through hole in the middle of the cross beam, a nut sleeve which can rotate freely in the horizontal direction is provided in the through hole of the cross beam, a thread which meshes with the thread on the outer side of the screw column is provided in the nut sleeve, and when the nut sleeve rotates, the screw column is driven to rise and fall, so that the pressure transmitter at the bottom of 51 is attached to the top of the pressure plate, and a static pressure of 1-3 tons is applied between the pressure transmitter and the tank body.

[0020] Preferably, a support seat is provided in a groove at the bottom of the screw column for installing the pressure transmitter, the support seat is fixed inside the screw column, and the fixing seat at the top of the pressure transmitter is fixed to the support seat.

[0021] Preferably, a buffer ring is provided at the bottom of the screw column, and the buffer ring is wrapped around the outside of the pressure transmitter, wherein the bottom surface of the top seat at the bottom of the pressure transmitter is lower than the bottom surface of the buffer ring, and the top surface of the top seat is higher than the bottom surface of the buffer ring, thereby ensuring the sealing effect inside the pressure transmitter.

[0022] Preferably, a horizontally mounted rotating wheel is fixedly connected to the nut sleeve, and a vertically mounted handle is provided on the rotating wheel. Rotating the handle and the rotating wheel drives the nut sleeve to rotate, thereby driving the screw column to rise and fall.

[0023] Preferably, the cross beam is higher than the water surface, and both ends of the cross beam are fixedly connected to vertical beams by bolts. Each vertical beam is vertically inserted into the water of the pool, and the vertical beam is fixed to the pool wall.

[0024] Preferably, the vertical beam is fixed to the pool wall by chemical bolts.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the utility model provides a buoyancy detection device for a water buried tank, which has the following beneficial effects:

[0027] 1. The buoyancy detection device for the submerged tank is provided with a horizontal beam on the water pool, a pressure transmitter is provided between the bottom of the beam and the tank body, and a static pressure of 1-3 tons is provided between the pressure transmitter and the tank body, so that the pressure transmitter is closely attached to the top of the tank body, and the stress condition of the tank body under a small displacement is detected, thereby monitoring the buoyancy and anti-floating effect of the tank body in real time, and sending out an alarm when the anti-floating effect is poor, so as to avoid the anti-floating device from breaking and causing the tank body to float.

[0028] 2. The buoyancy detection device for the buried tank, by setting a lifting device between the crossbeam and the pressure transmitter, adjusts the height of the pressure transmitter under the cooperation of the screw pair of the screw column and the nut sleeve to adapt to the pools of different depths, and at the same time gives the pressure transmitter a static pressure of 1-3 tons. Since the screw pair formed by the screw nut has a certain axial load, it will not loosen when subjected to upward buoyancy, the structure is stable, and the test accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic diagram showing the structure of a water buried tank according to the utility model installed in a water pool.

[0030] FIG. 2 is a schematic structural diagram of a water buried tank according to the present invention.

[0031] FIG3 is a front cross-sectional view of the utility model water buried tank installed in a pool.

[0032] FIG. 4 is a schematic diagram of the structure of the pressure transmitter of the utility model installed in the lifting device.

[0033] FIG5 is a schematic diagram of the structure of the pressure transmitter of the present utility model.

[0034] FIG. 6 is a partial enlarged view of the A area in FIG. 3 of the present invention.

[0035] In the figure: 10, tank body; 2, water pool; 11, pressure plate; 12, anti-floating device; 31, cross beam; 32, vertical beam; 4, pressure transmitter; 5, lifting device; 51, screw column; 52, nut sleeve; 53, rotating wheel; 54, handle; 511, support seat; 512, buffer ring; 41, fixing seat; 42, sensor; 43, top seat. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] Embodiment 1:

[0040] This embodiment provides a buoyancy detection device for a submerged tank, which has the following technical features.

[0041] Please refer to Figure 1-6, a buoyancy detection device for a submerged tank includes:

[0042] A pool 2, wherein the pool 2 is filled with water;

[0043] The tank body 10 is installed in the pool 2, the tank body 10 is completely submerged in water, and an anti-floating device 12 is provided at the bottom of the tank body 10, and the anti-floating device 12 fixes the tank body 10 at the bottom of the pool 2;

[0044] A crossbeam 31, the crossbeam 31 is located above the tank body 10, and both ends of the crossbeam 31 are riveted to the pool wall of the pool 2;

[0045] The pressure transmitter 4 is installed just below the middle position of the crossbeam 31, and the bottom of the pressure transmitter 4 is at the middle position of the top of the tank body 10, and there is static pressure between the pressure transmitter 4 and the tank body 10;

[0046] A pressure plate 11 is installed on the top of the tank body 10, and the pressure transmitter 4 is supported on the pressure plate 11. The pressure plate 11 is used to distribute the downward pressure of the pressure transmitter 4 to the entire tank body 10 to avoid deformation of the tank body 10 caused by local force;

[0047] The data box collects and analyzes the pressure value detected by the pressure transmitter 4 through the cable.

[0048] As shown in FIG1-6, when the pressure transmitter 4 is installed, a tensioning bolt is provided on the pressure transmitter 4 to apply a static pressure of 1-3 tons between the pressure transmitter 4 and the pressure plate 11, thereby improving the fit between the pressure transmitter 4 and the pressure plate 11. Because under the action of buoyancy, the deformation of the anti-floating device 12 will break as long as it passes 1 mm. Therefore, by increasing the static pressure, the force change under the slight distance change can be detected.

[0049] Further, as shown in Figures 1-6, the cross beam 31 is higher than the water surface, and both ends of the cross beam 31 are fixedly connected to vertical beams 32 by bolts. Each vertical beam 32 is vertically inserted into the water of the pool 2, and the vertical beam 32 is fixed to the pool wall of the pool 2. The vertical beam 32 is fixed to the pool wall of the pool 2 by chemical bolts, which reduces water erosion of the bolts and improves durability.

[0050] Embodiment 2:

[0051] Please refer to Figures 1-6, a buoyancy detection device for a submerged tank includes: a pool 2, the pool 2 is filled with water; a tank body 10, the tank body 10 is installed in the pool 2, the tank body 10 is completely submerged in water, and an anti-floating device 12 is provided at the bottom of the tank body 10, and the anti-floating device 12 fixes the tank body 10 to the bottom of the pool 2; a crossbeam 31, the crossbeam 31 is located above the tank body 10, and both ends of the crossbeam 31 are riveted to the pool wall of the pool 2; a pressure transmitter 4, the pressure transmitter 4 is installed just below the middle position of the crossbeam 31, the bottom of the pressure transmitter 4 is against the middle position of the top of the tank body 10, and there is a pressure transmitter 4 between the pressure transmitter 4 and the tank body 10. With static pressure; a pressure plate 11, which is installed on the top of the tank body 10, and the pressure transmitter 4 is pressed against the pressure plate 11 from below. The pressure plate 11 is used to distribute the downward pressure of the pressure transmitter 4 to the entire tank body 10 to avoid deformation of the tank body 10 caused by local force; a data box, which collects and analyzes the pressure value detected by the pressure transmitter 4 through a cable; a lifting device 5, a lifting device 5 is also provided on the crossbeam 31, and the pressure transmitter 4 is installed at the bottom of the lifting device 5. The pressure transmitter 4 includes a fixed seat 41 and a top seat 43 at the upper and lower ends, and a sensor 42 installed between the fixed seat 41 and the top seat 43.

[0052] Specifically, the lifting device 5 includes: a screw column 51, a groove for installing the pressure transmitter 4 is provided at the bottom of the screw column 51, and a thread is provided on the outer side of the screw column 51; a nut sleeve 52, a vertical through hole is provided in the middle position of the cross beam 31, a nut sleeve 52 that can rotate freely in the horizontal direction is provided in the through hole of the cross beam 31, and a thread that meshes with the thread on the outer side of the screw column 51 is provided in the nut sleeve 52. When the nut sleeve 52 rotates, it drives the screw column 51 to rise and fall, so that the pressure transmitter 4 at the bottom of 51 is attached to the top of the pressure plate 11, and a static pressure of 1-3 tons is applied between the pressure transmitter 4 and the tank body 10.

[0053] Further, as shown in Figures 1-6, a support seat 511 is provided in the groove at the bottom of the screw column 51 for installing the pressure transmitter 4, the support seat 511 is fixed inside the screw column 51, and the fixing seat 41 at the top of the pressure transmitter 4 is fixed to the support seat 511.

[0054] Further, as shown in Figures 1-6, a buffer ring 512 is provided at the bottom of the screw column 51, and the buffer ring 512 is wrapped around the outside of the pressure transmitter 4, wherein the bottom surface of the top seat 43 at the bottom of the pressure transmitter 4 is lower than the bottom surface of the buffer ring 512, and the top surface of the top seat 43 is higher than the bottom surface of the buffer ring 512, thereby ensuring the sealing effect inside the pressure transmitter 4.

[0055] Further, as shown in FIGS. 1-6 , a horizontally mounted rotating wheel 53 is fixedly connected to the nut sleeve 52 , and a vertically mounted handle 54 is provided on the rotating wheel 53 . Rotating the handle 54 and the rotating wheel 53 drives the nut sleeve 52 to rotate, thereby driving the screw column 51 to rise and fall.

[0056] Embodiment three:

[0057] This embodiment provides a water-buoyancy tank buoyancy detection device suitable for use in newly built stations.

[0058] A buoyancy detection device for a submerged tank comprises: a pool 2, the pool 2 is filled with water; a tank body 10, the tank body 10 is installed in the pool 2, the tank body 10 is completely submerged in water, an anti-floating device 12 is provided at the bottom of the tank body 10, the anti-floating device 12 fixes the tank body 10 at the bottom of the pool 2; a crossbeam 31, the crossbeam 31 is located above the tank body 10, both ends of the crossbeam 31 are riveted to vertical beams 32, and the vertical beams 32 are cast in the pool wall of the pool 2; a pressure transmitter 4, the pressure transmitter 4 is installed on the crossbeam 31 1, the bottom of the pressure transmitter 4 is pressed against the middle position of the top of the tank body 10, and there is static pressure between the pressure transmitter 4 and the tank body 10; the pressure plate 11, which is installed on the top of the tank body 10, and the bottom of the pressure transmitter 4 is pressed against the pressure plate 11, and the pressure plate 11 is used to distribute the downward pressure of the pressure transmitter 4 to the whole tank body 10 to avoid deformation of the tank body 10 caused by local force; the data box, which collects and analyzes the pressure value detected by the pressure transmitter 4 through the cable.

[0059] Working principle: A 50 cubic meter tank 10 is installed in the water in the pool 2. The bottom of the tank 10 is fixed to the bottom of the pool 2 by an anti-floating device 12. During the change of the storage volume of liquefied gas in the tank 10, the anti-floating device 12 is always subjected to the buoyancy pull of 20-40 tons. The metal fatigue of the anti-floating device 12 is caused by the constant change of the force, resulting in deformation. The deformation amplitude is very small, within 1 mm. If it exceeds 1 mm, it will break at any time. At this time, a crossbeam 31 is set on the top of the pool 2. A pressure transmitter 4 is set between the crossbeam 31 and the tank 10 to detect the pressure change. Through the action of the tension bolt or the lifting device 5, a static pressure of 1-3 tons is given to the pressure transmitter 4, so that the pressure transmitter 4 is always closely attached to the top of the tank 10, and the force change in the small deformation of the tank 10 is detected, and the pressure is transmitted to the data box for monitoring. When the force is abnormal, an alarm is issued to remind;

[0060] At the same time, since the depth of the water pool 2 is uncertain and the height between the top of the tank body 10 and the cross beam 31 is inconsistent, a lifting device 5 is set. With the cooperation of the screw column 51 and the nut sleeve 52, the height of the pressure transmitter 4 is adjusted, and at the same time, a static pressure of 1-3 tons is given to the pressure transmitter 4. Since the spiral pair formed by the screw nut has a certain axial load, it will not loosen when subjected to upward buoyancy.

[0061] In summary, the buoyancy detection device for the submerged tank is configured by arranging a horizontal beam 31 on the water pool 2, arranging a pressure transmitter 4 between the bottom of the beam 31 and the tank body 10, and setting a static pressure of 1-3 tons between the pressure transmitter 4 and the tank body 10, so that the pressure transmitter 4 is tightly fitted to the top of the tank body 10, and the stress condition of the tank body 10 under a small displacement is detected, thereby monitoring the buoyancy and anti-floating effect of the tank body 10 in real time, and issuing an alarm when the anti-floating effect is poor, thereby preventing the anti-floating device 12 from breaking and causing the tank body 10 to float.

[0062] The buoyancy detection device for the buried tank is provided with a lifting device 5 between the crossbeam 31 and the pressure transmitter 4. With the cooperation of the screw pair of the screw column 51 and the nut sleeve 52, the height of the pressure transmitter 4 is adjusted to adapt to the water pools 2 of different depths. At the same time, a static pressure of 1-3 tons is given to the pressure transmitter 4. Since the screw pair formed by the screw nut has a certain axial load, it will not loosen when subjected to upward buoyancy, and the structure is stable and the test accuracy is high.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0064] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A buoyancy detection device for a submerged tank, characterized in that: include: A water pool (2), wherein the water pool (2) is filled with water; A tank body (10), the tank body (10) being installed in a pool (2), the tank body (10) being completely submerged in water, an anti-floating device (12) being provided at the bottom of the tank body (10), the anti-floating device (12) fixing the tank body (10) at the bottom of the pool (2); A crossbeam (31), the crossbeam (31) being located above the tank body (10), and both ends of the crossbeam (31) being detachably mounted on the pool wall of the pool (2); A pressure transmitter (4), the pressure transmitter (4) being installed just below the middle position of the crossbeam (31), the bottom of the pressure transmitter (4) being against the middle position of the top of the tank body (10), and static pressure being present between the pressure transmitter (4) and the tank body (10); A pressure plate (11), the pressure plate (11) being mounted on the top of the tank body (10), the pressure transmitter (4) being supported on the pressure plate (11) from below, the pressure plate (11) being used to distribute the downward pressure of the pressure transmitter (4) to the entire tank body (10), thereby preventing the tank body (10) from being deformed due to local stress; A data box collects and analyzes the pressure value detected by the pressure transmitter (4) through the cable.

2. A buoyancy detection device for a submerged tank according to claim 1, characterized in that: The crossbeam (31) is also provided with a lifting device (5), the pressure transmitter (4) is installed at the bottom of the lifting device (5), the pressure transmitter (4) comprises a fixing seat (41) and a top seat (43) at upper and lower ends, and a sensor (42) installed between the fixing seat (41) and the top seat (43), and the lifting device (5) comprises: A screw column (51), wherein a groove for mounting a pressure transmitter (4) is provided at the bottom of the screw column (51), and a thread is provided on the outer side of the screw column (51); A nut sleeve (52) is provided at the middle position of the cross beam (31) with a vertical through hole, a nut sleeve (52) which can rotate freely in the horizontal direction is provided in the through hole of the cross beam (31), a thread which is engaged with the outer thread of the screw column (51) is provided in the nut sleeve (52), and when the nut sleeve (52) rotates, it drives the screw column (51) to rise and fall, so that the pressure transmitter (4) at the bottom of 51 is attached to the top of the pressure plate (11), and a static pressure of 1-3 tons is applied between the pressure transmitter (4) and the tank body (10).

3. A buoyancy detection device for a submerged tank according to claim 2, characterized in that: A support seat (511) is provided in a groove at the bottom of the screw column (51) for mounting the pressure transmitter (4); the support seat (511) is fixed inside the screw column (51); and the fixing seat (41) at the top of the pressure transmitter (4) is fixedly connected to the support seat (511).

4. A buoyancy detection device for a submerged tank according to claim 3, characterized in that: A buffer ring (512) is provided at the bottom of the screw column (51), and the buffer ring (512) is wrapped around the outside of the pressure transmitter (4), wherein the bottom surface of the top seat (43) at the bottom of the pressure transmitter (4) is lower than the bottom surface of the buffer ring (512), and the top surface of the top seat (43) is higher than the bottom surface of the buffer ring (512), thereby ensuring a sealing effect inside the pressure transmitter (4).

5. A buoyancy detection device for a submerged tank according to claim 4, characterized in that: A horizontally mounted rotating wheel (53) is fixedly connected to the nut sleeve (52), and a vertically mounted handle (54) is arranged on the rotating wheel (53). The nut sleeve (52) is driven to rotate by rotating the handle (54) and the rotating wheel (53), thereby driving the screw rod column (51) to rise and fall.

6. A buoyancy detection device for a submerged tank according to claim 1, characterized in that: The cross beam (31) is higher than the water surface, and both ends of the cross beam (31) are fixedly connected to vertical beams (32) by bolts. Each vertical beam (32) is vertically inserted into the water of the pool (2), and the vertical beams (32) are fixed to the pool wall of the pool (2).

7. A buoyancy detection device for a submerged tank according to claim 6, characterized in that: The vertical beam (32) is fixedly connected to the pool wall of the pool (2) by chemical bolts.

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