A foundation pit support monitoring device and its monitoring method

Abstract

The present invention belongs to the technical field of foundation pit support, and provides a foundation pit support monitoring device, which includes: a pair of anchor fittings arranged at a corner of the foundation pit, the pair of anchor fittings are arranged staggeredly and are anchored to the foundation pit in mutually perpendicular directions. The anchor fitting includes a bolt, one end of the bolt is used to extend into the foundation pit, and a pressure sensor is arranged in contact with the other end of the bolt. The pressure sensor cooperates with the bolt to monitor the lateral stress of the foundation pit; a pair of support frames, the pair of anchor fittings are respectively fixed on the pair of support frames, the support frames cover the anchor fittings, and the mutually close sides of the pair of support frames are cross-matched. The present invention can, on the basis of realizing long-term real-time monitoring, improve the support effect on the foundation pit and effectively reduce the occurrence of foundation pit collapse accidents.

Description

Technical Field

[0001] The present invention belongs to the technical field of foundation pit support, and particularly relates to a foundation pit support monitoring device and a monitoring method thereof. Background Art

[0002] A foundation pit is an earth pit excavated at the designed position according to the base elevation and plane dimensions. In order to make the soil slope stable, a foundation pit support device is required. However, with the development of support technology, for the support measures of deep foundation pit structures, horizontal support is generally used to prevent the side wall surface extrusion force from causing the foundation pit to sink. However, the horizontal support structure is usually erected inside the foundation pit and will be disassembled according to the construction needs during use, resulting in cumbersome support steps, and the overall pressure detection of the foundation pit cannot be carried out in real time and effectively, resulting in poor prevention effect on foundation pit collapse accidents. Therefore, there is an urgent need for a foundation pit support monitoring device and a monitoring method to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a foundation pit support monitoring device and a monitoring method thereof to solve the above problems. On the basis of realizing long-term real-time monitoring, the support effect on the foundation pit is improved, and the occurrence of foundation pit collapse accidents is effectively reduced.

[0004] To achieve the above purpose, the present invention provides the following solution: A foundation pit support monitoring device includes:

[0005] A pair of anchor fittings, arranged at a corner of the foundation pit. The pair of anchor fittings are arranged staggeredly and are anchored to the foundation pit in mutually perpendicular directions. The anchor fitting includes a bolt. One end of the bolt is used to extend into the foundation pit, and a pressure sensor is in contact with the other end of the bolt. The pressure sensor cooperates with the bolt to monitor the lateral stress of the foundation pit;

[0006] A pair of support frames. The pair of anchor fittings are respectively fixed on the pair of support frames. The support frames cover the anchor fittings, and the mutually close sides of the pair of support frames are cross-matched.

[0007] Preferably, the anchor fitting further includes:

[0008] A sleeve, used to be fixed to the support frame. The contact end of the bolt and the pressure sensor is located inside the sleeve, and there is a gap between the bolt and the sleeve;

[0009] A collar, arranged between the bolt and the sleeve and used to fix the bolt. There is a variable interval between the bolt and the sleeve through the collar, and the pressure sensor is arranged in the variable interval.

[0010] Preferably, the collar is a composite ring structure, and the collar is sleeved on one end of the anchor rod extending into the casing, the collar is clamped with the anchor rod, and the outer wall of the collar is fixed to the inner wall of the casing. When the foundation pit soil is offset in a first direction, the anchor rod moves in a second direction opposite to the first direction with the collar as a fulcrum.

[0011] Preferably, it also includes:

[0012] An airbag is filled in the gap, and the airbag is an annular structure. A plurality of pressure sensors are circumferentially arranged on a side of the airbag close to the anchor rod.

[0013] Preferably, the outer wall surface of the sleeve is provided with at least one pair of clamping plates, the clamping plates are annular structures, and the sleeve is fixed to the support frame through the pair of clamping plates.

[0014] Preferably, the anchor rod is a hollow tubular structure, one end of the anchor rod extending into the foundation pit is provided with an expansion anchor bolt, and the other end of the anchor rod is connected to the outside through a pipeline.

[0015] Preferably, the support frame comprises:

[0016] a plurality of first steel bar groups, and a plurality of second steel bars vertically fixed to the first steel bar groups;

[0017] Among them, a first segment is provided between adjacent first steel bar groups, and a second segment is provided between adjacent second steel bars. The first segment and the second segment are enclosed to form an accommodating interval for accommodating the sleeve, and are respectively arranged in an alternating arrangement in the accommodating intervals of a pair of support frames.

[0018] Preferably, the first steel bar group includes a pair of first steel bars with a third segment arranged therebetween, and the anchor rod diameter is smaller than the length of the third segment.

[0019] A monitoring method, based on the foundation pit support monitoring device, comprises the following steps:

[0020] Binding and fixing a plurality of first steel bar groups and second steel bars to form a plurality of accommodation spaces, and staggering the accommodation spaces on two support frames in a pair of support frames;

[0021] The casing is passed through the accommodation interval and fixed to the support frame through the clamping plate, and one end of the anchor rod is extended out of the support frame and arranged crosswise with another adjacent anchor rod;

[0022] By extending the cross-set anchor rods into both sides of a corner in the foundation pit and grouting them to fix them;

[0023] After the anchor rod fixes the support frame in the foundation pit, a support plate is formed by pouring concrete to realize the support of the foundation pit. During the support process, one end of the anchor rod located inside the sleeve contacts the pressure sensor to realize the long-term real-time monitoring of the pressure condition of the foundation pit.

[0024] Preferably, when grouting to fix the anchor rod, the airbag is inflated to make the pressure sensor abut against the part of the anchor rod located inside the sleeve.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] In the present invention, a pair of support frames are erected at a corner of the foundation pit, and a pair of anchor fittings are respectively fixedly connected to the pair of support frames. One end of the anchor rod extends into the foundation pit for anchoring, so as to cross and extend into the soil body along a corner of the foundation pit. Through the staggered fixation of the anchor rods respectively located on the pair of support frames, while the anchor fittings are fixed to the foundation pit, the support frames are stably connected to the foundation pit. By increasing the connection contact area with the foundation pit, the connection strength between the support frames and the foundation pit is enhanced, and the support effect is improved. In addition, the other end of the anchor rod is in contact with a pressure sensor, and the side stress of the foundation pit is monitored through the pressure sensor, which provides protection for preventing the collapse of the foundation pit and ensuring construction safety. In addition, the anchor fittings are protected by covering the support frames, reducing the structural deviation of the anchor fittings during the construction process. Not only the support strength is enhanced, but also the monitoring accuracy of the side stress of the foundation pit is improved, ensuring the preventive effect of the support monitoring device against the collapse of the foundation pit. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0028] Figure 1 It is a structural schematic diagram of the support frame and the anchor fitting;

[0029] Figure 2 It is a structural schematic diagram of the anchor rod and the expansion anchor bolt;

[0030] Figure 3 It is a structural sectional view of the sleeve;

[0031] Figure 4 For Figure 1 The partial enlarged view at A in

[0032] Among them, 1. Support frame; 2. Anchor rod; 3. Pressure sensor; 4. Sleeve; 5. Collar; 6. Airbag; 7. Splint; 8. Expansion anchor bolt; 9. First steel bar; 10. Second steel bar; 11. Third steel bar; 12. Sealing partition board; 13. Pipeline. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0034] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0035] Embodiment: Refer to Figures 1-4 , a foundation pit support monitoring device, including:

[0036] A pair of anchor fittings are arranged at a corner of the foundation pit. The pair of anchor fittings are arranged staggeredly and are anchored to the foundation pit in mutually perpendicular directions. The anchor fittings include anchor rods 2. One end of the anchor rod 2 is used to extend into the foundation pit, and a pressure sensor 3 is contact - arranged at the other end of the anchor rod 2. The pressure sensor 3 cooperates with the anchor rod 2 to monitor the lateral stress of the foundation pit;

[0037] A pair of support frames 1, and the pair of anchor fittings are respectively fixed on the pair of support frames 1. The support frames 1 cover the anchor fittings, and the mutually close - side of the pair of support frames 1 are cross - cooperated.

[0038] In the present invention, by erecting a pair of support frames 1 at a corner of the foundation pit and respectively fixing a pair of anchor fittings on the pair of support frames 1, and using one end of the anchor rod 2 to extend into the foundation pit for anchoring, so as to cross - extend into the soil body along a corner of the foundation pit. Through the staggered fixation of the anchor rods 2 respectively located on the pair of support frames 1, while the anchor fittings are fixed to the foundation pit, the support frames 1 are stably connected to the foundation pit. By increasing the connection contact area with the foundation pit, the connection strength between the support frames 1 and the foundation pit is enhanced, and the support effect is improved. In addition, a pressure sensor 3 is contact - arranged at the other end of the anchor rod 2, and the lateral stress of the foundation pit is monitored through the pressure sensor 3, providing guarantee for preventing the collapse of the foundation pit and ensuring construction safety. Moreover, by covering the anchor fittings with the support frames 1 to protect the anchor fittings, the structural deviation of the anchor fittings during the construction process is reduced. Not only the support strength is enhanced, but also the monitoring accuracy of the lateral stress of the foundation pit is improved, ensuring the preventive effect of the support monitoring device against the collapse of the foundation pit.

[0039] In the present technical solution, several pairs of support frames 1 can be provided according to actual needs. Similarly, several pairs of anchors can be provided in order from top to bottom. In view of the generation of lateral stress of the foundation pit, a pressure sensor 3 can be provided only in the anchor located at the top to solve the cost of support use. By detecting the pressure change at the top of the foundation pit, the collapse of the foundation pit can be judged, and the support frame 1 is permanently supported and fixed to the inner wall of the foundation pit, avoiding the traditional horizontal monitoring device from being loaded and unloaded according to construction needs during installation and use, and realizing real-time monitoring while supporting. In addition, a pair of support frames 1 are arranged crosswise on the sides close to each other. During support, the length of the support net can be increased so that the two ends of the support net are extended into the foundation pit and connected to the foundation pit. After pouring concrete, a support structure fixed to the inner wall of the foundation pit is directly formed.

[0040] Furthermore, the anchoring member further comprises:

[0041] The casing 4 is used to be fixed to the support frame 1. The contact ends of the anchor rod 2 and the pressure sensor 3 are located in the casing 4. A gap is provided between the anchor rod 2 and the casing 4.

[0042] The collar 5 is provided between the anchor rod 2 and the sleeve 4 and is used to fix the anchor rod 2. A variable section is formed between the anchor rod 2 and the sleeve 4, and the pressure sensor 3 is provided in the variable section.

[0043] By fixing the casing 4 to the support frame 1 and setting the pressure sensor 3 in the casing 4 to protect its structure and maintain its contact monitoring sensitivity with the anchor rod 2, a gap is set between the anchor rod 2 and the casing 4, and the ring 5 is set on the anchor rod 2 and located in the gap. While fixing the anchor rod 2 and the casing 4, it can satisfy the formation of a variable interval between the anchor rod 2 relative to the ring 5 and the casing 4, so that when the lateral stress of the foundation pit changes, the anchor rod 2 can be in active contact with the pressure sensor 3 within the variable interval, avoiding the situation where the anchor rod 2 is stuck with the casing 4, resulting in the pressure sensor 3 being unable to effectively monitor the pressure changes of the foundation pit through the anchor rod 2, thereby ensuring the monitoring effect.

[0044] Furthermore, the ring 5 is a composite annular structure, and the ring 5 is sleeved on one end of the anchor rod 2 extending into the casing 4. The ring 5 is clamped with the anchor rod 2, and the outer wall of the ring 5 is fixed to the inner wall of the casing 4. When the foundation pit soil is offset along the first direction, the anchor rod 2 moves along the second direction opposite to the first direction with the ring 5 as the fulcrum.

[0045] Reference Figure 3, the collar 5 can adopt one of the structures such as frustum-shaped, conical, and circular. By sleeving the collar 5 on the anchor rod 2, the protruding structure formed on the side wall surface of the collar 5 is used to be clamped and fixed with the sleeve 4. Moreover, structures such as threads and corrugations are provided on the outer wall surface of the anchor rod 2, so that the inner wall of the collar 5 is clamped and fixed with the anchor rod 2. And the part of the collar 5 located inside the sleeve 4 is an elastic structure. When the anchor rod 2 is deflected due to the foundation pit pressure, it can perform a lever movement along the connection end of the collar 5 and the sleeve 4 and abut against the pressure sensor 3 to realize the detection of the foundation pit pressure.

[0046] Furthermore, it also includes:

[0047] An airbag 6, which is filled in the gap. The airbag 6 is of an annular structure, and a number of pressure sensors 3 are circumferentially arranged on the side of the airbag 6 close to the anchor rod 2.

[0048] By filling the annular airbag 6 in the gap, after inflation, the airbag 6 surrounds and wraps the anchor rod 2. Using a number of pressure sensors 3 arranged on the inner wall surface of the airbag 6, the contact between the anchor rod 2 and the pressure sensor 3 is realized to complete the pressure monitoring of the foundation pit.

[0049] Furthermore, at least a pair of clamping plates 7 are arranged on the outer wall surface of the sleeve 4. The clamping plates 7 are of an annular structure, and the sleeve 4 is fixed to the support frame 1 through a pair of clamping plates 7.

[0050] In this technical solution, the clamping plates 7 can be pre-slid over the sleeve 4. After the pair of clamping plates 7 are respectively located on both sides of the support frame 1, the clamping plates 7 are welded and fixed to the sleeve 4, and the sleeve 4 is clamped and fixed through the clamping plates 7 and the support frame 1.

[0051] Furthermore, the anchor rod 2 is a hollow tubular structure. An expansion anchor bolt 8 is arranged at one end of the anchor rod 2 extending into the foundation pit, and the other end of the anchor rod 2 is communicated with the outside through a pipeline 13.

[0052] An expansion anchor bolt 8 is fixedly connected to the front end of the anchor rod 2. A common expansion shell anchor head is adopted, and the fixing stability is further improved after grouting and anchoring through the pipeline 13.

[0053] In an embodiment of the present invention, a sealing partition plate 12 is fixedly connected to the end of the sleeve 4 far from the anchor rod 2. The pipeline 13 penetrates through the sealing partition plate 12 and is communicated with the outside, ensuring the grouting of the anchor rod 2 while protecting the structure of the pressure sensor 3 in the sleeve 4 and ensuring the monitoring effect.

[0054] Furthermore, the support frame 1 includes:

[0055] A number of first steel bar groups, and a number of second steel bars 10 fixedly connected perpendicular to the first steel bar groups;

[0056] Among them, a first segment is set between adjacent first steel bar groups, and a second segment is set between adjacent second steel bars 10. The first segment and the second segment are enclosed to form an accommodating interval for accommodating the sleeve 4, which are respectively arranged in an staggered arrangement in the accommodating intervals of a pair of support frames 1.

[0057] In this technical solution, the support frame 1 is formed by splicing two steel meshes, and a number of third steel bars 11 are tied between the two steel meshes to improve the structural strength of the overall support frame 1. A number of first steel bar groups and second steel bars 10 are vertically welded to form a steel mesh. The two steel meshes are used to realize that the first segment and the second segment cover the casing 4 on both sides of the casing 4, while protecting the overall anchor, it also ensures the effect of pressure monitoring in the casing 4. In addition, this patent avoids the stacking of two anchor rods 2 located on a pair of support frames 1 at one end extending into the foundation pit by staggered arrangement of the accommodating intervals on a pair of support frames 1. While making space, it also improves the support strength of the support frame 1 and the foundation pit, and the anchor rods 2 can monitor the pressure of the foundation pit along different directions to achieve precise monitoring.

[0058] Furthermore, the first steel bar group includes a pair of first steel bars 9 with a third segment arranged therebetween, and the diameter of the anchor rod 2 is smaller than the length of the third segment.

[0059] The diameter of the anchor rod 2 is smaller than the third segment. When the support frame 1 is extended for use, the support frame 1 can be cross-distributed with the anchor rod 2 to stabilize the structure of the anchor rod 2 and cooperate with the anchor rod 2 to improve the supporting effect.

[0060] A monitoring method, based on a foundation pit support monitoring device, comprises the following steps:

[0061] Binding and fixing a plurality of first steel bar groups and second steel bars 10 to form a plurality of accommodation spaces, and staggering the accommodation spaces on two support frames 1 in a pair of support frames 1;

[0062] The sleeve 4 is passed through the accommodation area and fixed to the support frame 1 through the clamping plate 7, and one end of the anchor rod 2 is extended out of the support frame 1 and arranged crosswise with another adjacent anchor rod 2;

[0063] By extending the cross-arranged anchor rods 2 into both sides of a corner in the foundation pit and grouting them to fix them;

[0064] After the anchor rod 2 fixes the support frame 1 in the foundation pit, a support plate is formed by pouring concrete to support the foundation pit. During the support process, one end of the anchor rod 2 located in the casing 4 is in contact with the pressure sensor 3 to achieve long-term real-time monitoring of the foundation pit pressure condition.

[0065] Furthermore, when grouting is performed to fix the anchor rod 2 , the air bag 6 is inflated so that the pressure sensor 3 is pressed against the portion of the anchor rod 2 located in the casing 4 .

[0066] By inserting the casing 4 into the accommodation area, then installing a pair of clamping plates 7 on both sides of the second steel bar 10 respectively, welding and fixing the clamping plates 7 to the casing 4, or forming clamping of the second steel bar 10 through threaded connection. Meanwhile, anchor holes are drilled in the inner wall of the foundation pit. After the anchor rod 2 is inserted into the anchor hole, grouting is carried out through the pipeline 13. The expansion anchor bolt 8 is stably connected to the foundation pit, and the airbag 6 is inflated to make the pressure sensor 3 abut against the anchor rod 2. After the anchor rod 2 is fixed by grouting, the concrete support plate is prepared by pouring the overall support frame 1 to form a support structure for the overall foundation pit. And the monitoring device is arranged in the casing 4 to effectively reduce the influence of the outside world on the monitoring effect, realizing long-term and effective real-time monitoring of the foundation pit.

[0067] When the airbag 6 is inflated, the external control system receives the signal transmitted by the pressure sensor 3, and the pressure index is displayed on the external display screen as the anchor rod 2 abutting against the airbag 6. The principle can adopt using a single-chip microcomputer supporting the pressure sensor 3, and the single-chip microcomputer records and transmits data. When the pressure index changes positively or negatively along the base value, it is judged that the lateral stress of the foundation pit occurs. When the pressure index exceeds the threshold value, it can be judged that there is a collapse risk in the foundation pit.

[0068] In an embodiment of the present invention, after the anchor rod 2 fixes the support frame 1, the staff can directly anchor the remaining anchor rods 2 into the foundation pit along the direction perpendicular to the end face of the support frame 1 according to actual needs to further improve the support strength.

[0069] In the technical solution of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0070] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A foundation pit support monitoring device, characterized in that, Comprising: A pair of anchor fittings, arranged at a corner of the foundation pit. The pair of anchor fittings are arranged staggeredly and are anchored to the foundation pit in mutually perpendicular directions. The anchor fittings include anchor rods (2). One end of the anchor rod (2) is for extending into the foundation pit, and a pressure sensor (3) is arranged in contact with the other end of the anchor rod (2). The pressure sensor (3) cooperates with the anchor rod (2) to monitor the lateral stress of the foundation pit; A pair of support frames (1). The pair of anchor fittings are respectively fixed on the pair of support frames (1). The support frames (1) cover the outside of the anchor fittings, and the mutually approaching sides of the pair of support frames (1) are cross-matched; A sleeve (4), used for fixing to the support frame (1). The contact end of the anchor rod (2) and the pressure sensor (3) is located inside the sleeve (4), and a gap is arranged between the anchor rod (2) and the sleeve (4); A collar (5), arranged between the anchor rod (2) and the sleeve (4) and used for fixing the anchor rod (2). A variable interval is formed between the anchor rod (2) and the sleeve (4) through the collar (5), and the pressure sensor (3) is arranged in the variable interval; The collar (5) is a composite ring structure. The collar (5) is sleeved on one end of the anchor rod (2) extending into the sleeve (4). The collar (5) is clamped with the anchor rod (2), and the outer wall surface of the collar (5) is fixed to the inner wall of the sleeve (4). When the foundation pit soil mass deflects in the first direction, the anchor rod (2) moves in the second direction opposite to the first direction with the collar (5) as a fulcrum; An airbag (6), filled in the gap. The airbag (6) is an annular structure, and a plurality of the pressure sensors (3) are circumferentially arranged on the side of the airbag (6) close to the anchor rod (2); At least a pair of clamping plates (7) are arranged on the outer wall surface of the sleeve (4). The clamping plates (7) are annular structures, and the sleeve (4) is fixed to the support frame (1) through the pair of clamping plates (7).

2. The foundation pit support monitoring device according to claim 1, wherein: The anchor rod (2) is a hollow tubular structure. An expansion anchor bolt (8) is arranged at one end of the anchor rod (2) extending into the foundation pit, and the other end of the anchor rod (2) is communicated with the outside through a pipeline (13).

3. The foundation pit support monitoring device according to claim 1, wherein, The support frame (1) includes: A plurality of first steel bar groups, and a plurality of second steel bars (10) perpendicularly and fixedly connected to the first steel bar groups; Wherein, a first section is arranged between adjacent first steel bar groups, and a second section is arranged between adjacent second steel bars (10). The first section and the second section enclose to form an accommodation interval for accommodating the sleeve (4), and the accommodation intervals arranged on the pair of support frames (1) are arranged staggeredly.

4. The foundation pit support monitoring device according to claim 3, characterized in that: The first steel bar group includes a pair of first steel bars (9) with a third section arranged therebetween. The diameter of the anchor rod (2) is smaller than the length of the third section.

5. A monitoring method, based on the foundation pit support monitoring device according to any one of claims 1-4, characterized in that, Including the following steps: Binding and fixing a plurality of first steel bar groups and the second steel bars (10) to form a plurality of accommodation intervals, and making the accommodation intervals on the two support frames (1) of the pair of support frames (1) arranged staggeredly; Insert the casing (4) into the accommodation area and fix it to the support frame (1) through the splint (7), and extend one end of the anchor rod (2) out of the support frame (1) and arrange it crosswise with another adjacent anchor rod (2); Respectively insert the crosswise arranged anchor rods (2) into both sides of a corner in the foundation pit and grout to fix them; After the anchor rod (2) fixes the support frame (1) in the foundation pit, form a support plate by pouring concrete to realize the support of the foundation pit. During the support process, use the end of the anchor rod (2) located inside the casing (4) to contact the pressure sensor (3) to realize the long-term real-time monitoring of the pressure condition of the foundation pit.

6. The monitoring method according to claim 5, wherein: When grouting to fix the anchor rod (2), inflate the airbag (6) to make the pressure sensor (3) abut against the part of the anchor rod (2) located inside the casing (4).

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