A protection device for settlement plate measuring point filling construction period

Abstract

The utility model discloses a kind of protection devices of filling construction period of settlement plate measuring point, it is related to geotechnical engineering settlement monitoring technical field, to solve the problem of settlement plate and measuring rod in filling construction process, accidental rolling etc. Device includes settlement plate, measuring rod, protection pipe, protection step, protection frame and protection mark: settlement plate is horizontally buried in soft foundation top surface, measuring rod is vertically fixed in settlement plate center and is gradually lengthened with filling body heightening;Protection pipe is sleeved in measuring rod outside, bottom is equipped with annular protection step and is closely contacted with filling body;Protection frame is reinforced four-corner frame structure, and bottom is inserted into filling body and fixed;The outside of protection frame is equipped with reflective warning strip and solar warning light.The utility model passes through "protection pipe-protection step-protection frame" three-stage protection structure, effectively avoids mechanical collision, enhances warning effect, ensures settlement monitoring data continuous and reliable, reduces equipment damage rate, and is applicable to various soft foundation filling engineering.

Description

Technical Field

[0001] This utility model relates to the field of settlement monitoring technology in civil engineering, specifically to a protective device for settlement plate measuring points in soft foundation filling projects during the construction period. Background Technology

[0002] In soft soil foundation treatment projects for geotechnical engineering such as highways, airports, and seawalls, settlement monitoring is a crucial step in assessing foundation stability and the safety of filling construction. To accelerate the consolidation efficiency of soft soil foundations, surcharge preloading is commonly used. However, excessively rapid surcharge can lead to instability of the surcharge. Therefore, it is essential to monitor foundation settlement during the construction of each surcharge layer. Settlement plates are one of the most commonly used monitoring devices. A settlement plate typically consists of a steel plate base and a metal measuring rod. By embedding the settlement plate in the top surface of the soft soil, the measuring rod extends upwards and is gradually lengthened as the fill material rises, thereby enabling real-time monitoring of the settlement deformation of the soft soil.

[0003] After the settlement plate monitoring points are installed, existing protective measures are mostly simple, such as using warning tape, bamboo poles, or colored flags to remind construction machinery to stay away. However, during the filling process, large machinery operates frequently, and the protective strength is insufficient, resulting in limited warning effectiveness. Machinery operations can easily cause collisions, crushing, or squeezing of the monitoring rods exposed on the fill surface, leading to bending, tilting, or even breakage of the rods, and displacement or deformation of the settlement plate base, making it impossible to effectively prevent mechanical collisions. This not only distorts monitoring data and affects project judgment, but in severe cases, it may also require the re-installation of settlement plates, increasing construction costs and delaying the project schedule.

[0004] Existing methods for protecting settlement plate measuring points during the construction period are insufficient to meet the requirements for both the construction period and long-term monitoring of soft foundation treatment under surcharge preloading. Therefore, it is crucial to develop simple, economical, and effective protection devices. Utility Model Content

[0005] To overcome the shortcomings of existing protection devices and address the problem that settlement plate measuring points are easily damaged by machinery during the filling construction period, this utility model provides a protection device for settlement plate measuring points during the filling construction period. Through a multi-level protection structure, it effectively protects the settlement plate and measuring rod, reducing the equipment damage rate.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A protective device for settlement plate measuring points during the construction period of soft soil foundation treatment using surcharge preloading method is disclosed. The device includes a settlement plate, a measuring rod, a measuring rod protective tube, a protective step, a protective frame, and protective markings. The settlement plate is horizontally embedded in the top surface of the soft soil foundation to collect foundation settlement data. The measuring rod is vertically fixed to the center of the settlement plate, with its top extending beyond the surface of the fill material and extended section by section via threaded connections. The measuring rod protective tube is fitted over the measuring rod, and its bottom has an annular protective step that is in close contact with the fill material to improve overall stability. The protective frame is a welded steel frame structure with four corners, fitted over the measuring rod protective tube and fixed by inserting its bottom into the fill material. The protective markings are located on the outside of the protective frame.

[0008] Furthermore, the settlement plate is made of square steel plate with a thickness of 8-12mm and a size of 500mm×500mm or 600mm×600mm. The bottom surface is in close contact with the soft soil foundation, and the top surface is leveled by a cushion layer of sand.

[0009] Furthermore, the measuring rod is made of steel pipe with a diameter of 3-5cm, a wall thickness of ≥3mm, a length of 1.0-1.5m per section, and threaded joints at both ends; the measuring rod is connected to the settlement plate by welding or threading, and reinforcing ribs are provided at the connection.

[0010] Furthermore, the protective tube for the measuring rod is made of steel pipe with a diameter of 58cm, and the inner diameter is 510mm larger than the outer diameter of the measuring rod to reserve space for settlement deformation. The wall thickness is ≥3mm, and a detachable rubber or plastic protective cover is provided at the top with a central opening. The protective cover allows the measuring rod to settle freely and prevents rainwater and soil from entering.

[0011] Furthermore, the protective step is a ring-shaped plain soil pile structure with an outer diameter of 0.5-1.0m, a height of 0.2-0.4m, and a compaction degree of ≥90%; the interior is equipped with a ring-shaped steel mesh or geogrid, which is fixed to the outer wall of the measuring rod protection pipe by binding wire.

[0012] Furthermore, the protective frame is welded together from four vertical steel bars and horizontal connecting bars. The bottom is inserted into the filling body to a depth of ≥0.3m, and the top horizontal bars are welded with hooks to hang warning signs. The diameter of the vertical steel bars is 16-25mm, and the horizontal connecting bars are spaced 0.5-1m apart.

[0013] Furthermore, the protective markings include reflective warning strips spirally attached to the vertical ribs of the protective frame, colored flags installed on the top, and solar-powered nighttime warning lights; the warning lights are red LED light sources with a flashing frequency of 1-2 times / second and a working time of ≥72 hours in continuous rainy weather.

[0014] Furthermore, the measuring rod and the measuring rod protection tube are spliced ​​together section by section by thread, with each section being 1.5-2.0m in length, and the top end of the spliced ​​section is exposed on the surface of the filling body.

[0015] Furthermore, the vertical reinforcing bars of the protective frame are symmetrically distributed around the measuring rod protective tube, with a spacing of 600mm×600mm, and the height is 0.3-0.6m higher than the current filling layer thickness.

[0016] Furthermore, the protective steps are constructed simultaneously with the backfill, and are tightly integrated with the annular steel mesh or geogrid during layered backfilling.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Through a three-tiered protective structure consisting of "protective pipe (inner layer to prevent direct collision), protective step (middle layer to prevent tipping), and protective frame (outer layer for mechanical isolation)," the equipment can effectively resist collisions and crushing by construction machinery. Engineering tests have verified that the equipment damage rate has been reduced to below 0.5%.

[0019] The protective step increases the contact area with the filling material, and the bottom of the protective frame is inserted into the filling material for fixation. The two work together to improve the overall anti-overturning capacity. Under the lateral thrust of the road roller, the tilt angle of the protective pipe is less than 1°, which meets the monitoring accuracy requirements.

[0020] The combination of reflective warning strips and solar-powered warning lights provides dual warning day and night, increasing the identification distance for construction workers to over 50 meters and significantly reducing the risk of accidental collisions.

[0021] All components are made of commonly used engineering materials (steel plates, steel bars, PVC pipes, etc.), resulting in low procurement costs. No special equipment is required during installation, and the installation time for a single measuring point is ≤2 hours. Furthermore, the components can be extended and adjusted synchronously with the filling construction, making them highly adaptable. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of a protective device for settlement plate measuring points during the filling construction period according to this utility model.

[0023] Figure 2 This is a schematic diagram of the arrangement structure of the inclinometer-water level pipe in this utility model.

[0024] In the diagram: 1—settlement plate; 2—measuring rod; 3—measuring rod protection pipe; 4—fill body; 5—protective step; 51—ring wire mesh; 52—geogrid; 6—protective frame; 61—hook; 62—construction warning sign; 7—protective sign; 71—reflective warning strip; 72—colored flag; 73—solar-powered nighttime warning light. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] This utility model embodiment provides a protective device for settlement slab measuring point filling construction period, applicable to the settlement slab measuring point filling construction period, as shown in the structural schematic diagram. Figure 1 As shown.

[0027] The protective device for the settlement plate measuring point during the filling construction period includes a settlement plate 1; a measuring rod 2; a measuring rod protection pipe 3; a protective step 5; a protective frame 6; and a protective sign 7.

[0028] The settlement plate 1 is made of square steel plate with a thickness of 8-12mm and a size of 500mm×500mm or 600mm×600mm. It is laid horizontally on the top surface of the leveled soft soil foundation, and its bottom surface is in close contact with the soft soil foundation 10.

[0029] The measuring rod 2 is made of steel pipe with a diameter of 3-5cm and a wall thickness of not less than 3mm. Each section is 1.0-1.5m long and has threads at both ends. As the height of the backfill increases, the pipe is extended section by section through threaded joints as the backfill rises.

[0030] The measuring rod 2 is connected to the settlement plate 1 by welding or threaded connection, and a reinforcing rib 21 is provided at the connection.

[0031] The protective pipe 3 is made of steel with a diameter of 58cm. Its inner diameter is larger than the outer diameter of the measuring rod 2 (510mm) to allow space for the measuring rod's settlement deformation. The pipe wall thickness is not less than 3mm, and its height matches the current fill layer thickness. Each section of the steel pipe has threads at both ends for extending the protective pipe. The top of the protective pipe 3 is equipped with a removable protective cap (made of rubber or plastic). The protective cap has a through hole in the center, which allows the measuring rod to settle freely while preventing rainwater and soil from entering the interior of the protective pipe.

[0032] The height of each layer of the filling body 4 is 0.2-0.5m, and the filling rate is controlled at 0.1m / day.

[0033] The protective step 5 is formed by a ring of backfill and is piled on the outer periphery of the bottom of the protective pipe 3. Its outer diameter is 0.5-1.0m and its height is 0.2-0.4m. The inside can be provided with a ring of steel mesh 51, which is fixed to the outer wall of the protective pipe 3 by wire ties, or a geogrid 52 is laid. Its bottom surface is tightly combined with the backfill, thereby increasing the contact area and improving the anti-tipping stability of the protective pipe.

[0034] The protective frame 6 is a four-corner frame structure, which is made up of four vertical steel bars and horizontal connecting bars. The vertical steel bars have a diameter of 16-25mm, a height that is 0.3-0.6m higher than the current filling layer thickness, and are inserted into the filling body 4 to a depth of not less than 0.3m at the bottom. They are symmetrically distributed around the outer perimeter of the protective pipe 3. The horizontal connecting bars are set at vertical intervals of 0.5-1m, and hooks 61 are welded on the top horizontal bars for hanging construction warning signs 62.

[0035] The protective signage 7 includes a reflective warning strip 71 affixed to the outside of the protective frame 6, a colored flag 72 installed on the top of the protective frame 6, and a solar-powered nighttime warning light 73.

[0036] The solar-powered night warning light 73 features a red LED light source and a flashing frequency of 1-2 times per second. It is installed at the center of the top of the protective frame and is powered by a solar panel. It can work for more than 72 hours in continuous rainy weather, enhancing the dynamic warning effect.

[0037] The implementation process of this utility model is as follows:

[0038] At the location to be monitored in the soft soil foundation, a 0.5m×0.5m×0.3m foundation pit was excavated using a small excavator. A 100mm thick graded sand and gravel cushion layer (particle size 510mm) was laid at the bottom of the pit, and a settlement plate 1 was placed. The elevation of the four corners was measured with a level instrument, and the elevation difference was controlled to be ≤2mm. The level was achieved by leveling with the cushion layer sand.

[0039] The measuring rod 2 and the measuring rod protection tube 3 are installed by screw splicing. Each section is 1.5-2.0m long. Multiple sections are spliced ​​together until they are above the ground level. Then the excavated soil is backfilled to the ground surface.

[0040] Fill the primary pile carrier 4 according to the filling rate requirements, control the filling height to be 20-50cm, and the filling rate to be 20cm / day.

[0041] Centered on the protective tube, mark out four vertical rib positions (600mm x 600mm apart) with a steel ruler, and embed the protective frame 6 into the stack carrier by hammering.

[0042] The protective steps 5 are constructed by excavator backfilling, using plain soil (compaction degree ≥90%) in layers. During the backfilling process, a ring-shaped wire mesh or geogrid is placed in the protective steps 5 to control the height of the protective steps to 20-50cm.

[0043] Install warning signs (71, 72, 73), spirally attach reflective strips along the vertical ribs of the protective frame, hang a "Settlement Monitoring Point - No Collision" sign on the east side of the protective frame, and fix it to the center of the top of the protective frame with a stainless steel bracket (500mm high) and install warning lights.

[0044] This utility model has the following features and effects:

[0045] 1. Three-level protection structure enhances damage resistance.

[0046] Inner protective tube: It is fitted on the outside of the measuring rod, with reserved space for settlement deformation (inner diameter is 510mm larger than the outer diameter of the measuring rod). The top is equipped with a detachable protective cover, which can directly resist the collision of the measuring rod by construction machinery and prevent rainwater and soil from entering, thus protecting the core monitoring components.

[0047] 2. Middle layer protective steps: The ring-shaped plain soil pile structure (compaction degree ≥90%) is tightly integrated with the filling body, and the inside is equipped with a ring-shaped steel mesh or geogrid. By increasing the contact area, the anti-tipping stability of the protective pipe is significantly improved, and the tilt angle is <1° under the lateral thrust of the road roller.

[0048] 3. Outer protective frame: The steel welded four-corner frame (with the bottom inserted into the backfill to a depth of ≥0.3m) forms a mechanical isolation barrier, which can withstand accidental scraping by large construction machinery and avoid direct impact on the internal structure.

[0049] 4. Warning system enhances construction safety

[0050] The protective frame is equipped with reflective warning strips (spiked) and solar-powered nighttime warning lights (red LED light source, flashing frequency 1-2 times / second, continuous operation for ≥72 hours in cloudy or rainy weather), achieving dual warning day and night, increasing the identification distance for construction personnel to more than 50m, and significantly reducing the risk of accidental collision.

[0051] 5. Modular design optimizes construction adaptability

[0052] The measuring rod and protective pipe are connected by thread (each section is 1.0-1.5m), and can be extended synchronously as the filling body rises. The installation time for a single measuring point is ≤2 hours. The protective frame and protective steps can be disassembled and repaired independently without the need for overall removal, reducing maintenance costs. It is suitable for 0.2-0.5m layered filling construction scenarios.

[0053] 6. Ensuring the continuity of monitoring data

[0054] Through the synergistic effect of the three-level protection structure, the equipment damage rate is reduced to below 0.5%, avoiding monitoring interruptions caused by bending of the measuring rod or displacement of the settlement plate, and ensuring the continuous collection of soft soil settlement data and the accuracy of engineering safety assessment.

[0055] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A protective device for settlement plate measuring points during the construction period, applied to the construction period of soft soil foundation treatment using surcharge preloading method, characterized in that: The system includes a settlement plate (1), a measuring rod (2), a measuring rod protection tube (3), a protective step (5), a protective frame (6), and a protective sign (7). The settlement plate (1) is horizontally buried on the top surface of the soft soil foundation (10) to collect foundation settlement data. The measuring rod (2) is vertically fixed to the center of the settlement plate (1), with its top end extending out of the surface of the fill body (4) and being extended section by section through threaded connection. The measuring rod protection tube (3) is sleeved on the outside of the measuring rod (2), and its bottom is provided with an annular protective step (5). The protective step (5) is in close contact with the fill body (4) to improve overall stability. The protective frame (6) is a four-corner frame structure welded with steel bars, sleeved on the outside of the measuring rod protection tube (3), and its bottom is inserted into the fill body (4) for fixation. The protective sign (7) is set on the outside of the protective frame (6).

2. The protection device according to claim 1, characterized in that: The settlement plate (1) is made of square steel plate with a thickness of 8-12mm and a size of 500mm×500mm or 600mm×600mm. The bottom surface is in close contact with the soft soil foundation (10), and the top surface is leveled by cushion sand.

3. The protection device according to claim 1, characterized in that: The measuring rod (2) is made of steel pipe with a diameter of 3-5cm and a wall thickness of ≥3mm. Each section is 1.0-1.5m long and has threaded joints at both ends. The measuring rod (2) is connected to the settlement plate (1) by welding or threading, and a reinforcing rib (21) is provided at the connection.

4. The protection device according to claim 1, characterized in that: The protective tube (3) of the measuring rod is made of steel pipe with a diameter of 58cm. The inner diameter is 510mm larger than the outer diameter of the measuring rod (2) to reserve space for settlement deformation. The wall thickness is ≥3mm. The top is equipped with a detachable rubber or plastic protective cover with a central opening. The protective cover allows the measuring rod (2) to settle freely and prevents rainwater and soil from entering.

5. The protection device according to claim 1, characterized in that: The protective step (5) is a ring-shaped plain soil pile structure with an outer diameter of 0.5-1.0m, a height of 0.2-0.4m, and a compaction degree of ≥90%. The interior is equipped with a ring-shaped steel mesh (51) or geogrid (52), which is fixed to the outer wall of the measuring rod protection pipe (3) by tie wire.

6. The protection device according to claim 1, characterized in that: The protective frame (6) is welded from four vertical steel bars and horizontal connecting bars. The bottom is inserted into the filling body (4) to a depth of ≥0.3m, and the top horizontal bars are welded with hooks (61) to hang warning signs (62). The diameter of the vertical steel bars is 16-25mm, and the horizontal connecting bars are spaced 0.5-1m apart.

7. The protection device according to claim 1, characterized in that: The protective sign (7) includes a reflective warning strip (71) spirally pasted on the vertical rib of the protective frame (6), a colored flag (72) installed on the top, and a solar-powered night warning light (73); the warning light (73) is a red LED light source with a flashing frequency of 1-2 times / second and a working time of ≥72 hours in continuous rainy weather.

8. The protection device according to claim 3, characterized in that: The measuring rod (2) and the measuring rod protection tube (3) are spliced ​​together section by section by thread, each section being 1.5-2.0m long, and the top end of the spliced ​​section is exposed on the surface of the filling body (4).

9. The protection device according to claim 6, characterized in that: The vertical reinforcing bars of the protective frame (6) are symmetrically distributed around the measuring rod protective tube (3) with a spacing of 600mm×600mm and a height 0.3-0.6m higher than the current filling layer thickness.

10. The protection device according to claim 5, characterized in that: The protective step (5) is constructed simultaneously with the filling body (4) and is tightly integrated with the annular steel mesh (51) or geogrid (52) during layered backfilling.

Images