A device and method for shaping depressions on slope surfaces of bagged concrete

Abstract

A device for shaping depressions on a mold bag concrete slope surface is characterized by comprising a weight module and a counterweight block, wherein the weight module comprises: a plurality of independent pressure columns, a main top beam, a secondary top beam, and a counterweight block; each pressure column is provided with a plurality of horizontal holes, the horizontal holes being distributed at different heights of the pressure column; a pressure strip is installed at the bottom end of the pressure column; the two ends of the main top beam are detachably connected to the horizontal holes on different pressure columns through the action of a connecting sleeve and a pin; the secondary top beam is used to connect the counterweight block to the main top beam, and the main top beam and the secondary top beam form a loading top surface; the counterweight block is detachably mounted on the loading top surface; by changing the position of the pressure column on the slope surface and the distance between different pressure columns, the slope depression area is surrounded, and the number of counterweight blocks is changed and cooperates with the pressure strip to press the surrounding of the slope depression area, so that the slurry does not spread during grouting, thereby helping to locally elevate the depression area. The device of the present invention can adjust the height of the loading top surface to adapt to different slope conditions, and is highly practical; and is simple to set up, easy to hoist, and efficient.

Description

Technical Field

[0001] The invention relates to the field of bank protection engineering, in particular to a method for shaping depressions on a slope surface of a bagged concrete. Background Art

[0002] Bag-formed concrete is one of the most prevalent forms of modern revetment due to its advantages, such as rapid construction and underwater construction capabilities. However, during the slope construction process, waves generated by construction vessels often damage the initial slope of the revetment, forming an initial depression, especially in sandy soils. Laying bags and pouring concrete on this depressed slope will result in a concave surface, compromising project quality. To achieve a high-quality revetment structure, reshaping the concave area of ​​the bag-formed concrete slope is often necessary.

[0003] At present, the only way to reshape the depressed areas of slopes made of bagged concrete is to lift the depressed areas by grouting. However, when the slurry is injected into the depressed area, due to the interface between the formwork and the soil layer, the slurry is very easy to run out, causing other areas to rise, while the depressed area fails to achieve the lifting effect. In actual projects, when such depressions occur, the only way is to peel off the entire formwork bag, re-reinforce the slope, and then cover it with bagged concrete. Therefore, the current grouting and lifting method has a very poor effect on shaping the depressed slope surface, resulting in some projects having to re-excavate the bank slope and re-construct the slope surface, which greatly increases the project cost. There is currently a lack of means to solve the problem of slurry running at the interface between the formwork bag and the soil. Summary of the Invention

[0004] To address the aforementioned issues, the present invention provides a method for shaping depressions in bagged concrete slopes. By placing pressure strips around the depressed area, and applying gravity to the strips via pressure columns, the load on the top surface is transferred to the strips, preventing the grouting slurry from spreading to other areas. This method allows for rapid shaping of localized depressions in bagged concrete slopes. This method boasts strong practicality, robust applicability, low cost, high construction efficiency, and excellent shaping results, making it particularly suitable for shaping depressed slopes in bagged concrete.

[0005] The present invention provides a device for shaping the depression of a mold bag concrete slope, which is composed of a weight module and a counterweight block. The weight module includes:

[0006] Multiple independent pressure columns, each with multiple horizontal holes distributed at different heights of the column and counterweights; a pressure strip is installed at the bottom of the column;

[0007] A main top beam, both ends of which are detachably connected to horizontal holes on different pressure columns through the action of connecting sleeves and pins;

[0008] The secondary top beam is used to connect the counterweight to the main top beam, and the main top beam and the secondary top beam form a loading top surface;

[0009] The counterweight block is detachably mounted on the loading top surface;

[0010] By changing the position of the pressure column on the slope and the distance between different pressure columns, the concave area of ​​the slope is surrounded. By changing the number of counterweights and cooperating with pressure strips to press the four sides of the concave area of ​​the slope, the slurry will not spread during grouting, thereby helping to lift the local grouting in the concave area.

[0011] Specifically, the connecting sleeve includes a vertical sleeve, a horizontal sleeve, and a flange, which are welded into one body; the inner diameter of the vertical sleeve is larger than the outer diameter of the pressure column, and the inner diameter of the horizontal sleeve is larger than the outer diameter of the main top beam; the vertical sleeve is used to be sleeved outside the pressure column, and the horizontal sleeve is used to be sleeved on the main top beam;

[0012] After adjusting the height of the connecting sleeve, insert the vertical sleeve into the pressure column, insert the pin into the horizontal hole, and clamp the flange to fix the position of the entire connecting sleeve and prevent it from falling.

[0013] The present invention provides a method for shaping a slope depression of a bagged concrete, which utilizes the above-mentioned slope depression shaping device to act on the slope depression area, specifically comprising the following steps:

[0014] Step 1: Determine the scope of the slope depression area and the original design slope line;

[0015] Step 2: drilling holes in the sunken area that needs to be reshaped, installing grouting holes, and connecting grouting pipes; the grouting pipes are connected to the grouting machine at the top of the slope;

[0016] Step 3: Based on the slope inclination and the height difference of the pressure column standing point, before hoisting the weight module as a whole to the slope depression, pre-adjust the connection position of the connecting sleeve on different pressure columns at different heights to ensure that the loading top surface can be in a nearly horizontal position after hoisting;

[0017] Step 4: hoist the entire weight module to the sunken area on the slope, with the pressure columns distributed around the sunken area and fixed. Then, hoist the counterweight block to the top loading surface. The weight of the counterweight block should be such that after pressing the sunken area on all sides, at least 80% of the total grouting slurry is used to lift the sunken area instead of being lost.

[0018] Step 5: Grouting. When the bagged concrete is lifted to the original designed slope line, stop grouting and seal the grouting holes.

[0019] Step 6: let it stand for a period of time to allow the slurry to generate adhesive force, and the adhesive force is sufficient to prevent the slurry from being lost after the weight module is removed;

[0020] Step 7: Lift the weight module to complete the shaping of the sunken area.

[0021] Specifically, the weight of the required counterweight is determined according to the shear strength of the stratum, the thickness of the mold bag concrete, and the grouting pressure, specifically:

[0022]

[0023] Where G is the weight of the counterweight, S and L are the bottom area and perimeter of the pressure column respectively, and G0 is the deadweight of the pressure module. 、 are the shear strength of concrete and the shear strength of stratum respectively, p is the grouting pressure, and D is the average thickness of the bagged concrete.

[0024] Specifically, the shape of the bead is circular or square; the installation position of the pressure column satisfies: after the pressure column is installed, the bead strips are connected end to end, and the area surrounded by the bead strips completely includes the recessed area.

[0025] Specifically, the grouting slurry is cement slurry or high polymer; the counterweight block is a sandbag, iron block or concrete block.

[0026] The present invention also provides an application of the above-mentioned slope depression shaping device and depression shaping method in depression shaping of a slope covered with bagged concrete.

[0027] The present invention has the following technical effects:

[0028] 1. The device designed in this invention can adjust the height of the loading top surface to adapt to different slope conditions, and is highly practical. It is also simple to set up, convenient to hoist, and highly efficient. Grouting can be performed on the concave area below the film bag without opening the concrete.

[0029] 2. The present invention prevents the grouting slurry from flowing everywhere by setting pressure strips in the collapsed area of ​​the slope and matching different numbers of counterweights. While ensuring the grouting effect, it is also beneficial to reduce the amount of grouting slurry used and reduce the grouting cost, and it is also environmentally friendly.

[0030] 3. The present invention also provides the gravity applied by the device during construction on the membrane bag concrete, including the weight of the applied counterweight, to provide a quantifiable basis for actual operation.

[0031] 4. The present invention is applicable to both underwater construction and dry land construction, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a picture of the unevenness after the actual mold bag concrete is poured.

[0033] Figure 2 This is a cross-sectional view of the slope surface depression of the bagged concrete caused by local instability of the silty soil layer.

[0034] Figure 3This is a front view of the slope surface depression of the bagged concrete caused by local instability of the silty soil layer.

[0035] Figure 4 This is a cross-sectional view of the slope depression repaired by the bagged concrete.

[0036] Figure 5 This is a horizontal view of repairing the depression on the slope of the bagged concrete.

[0037] Figure 6 It is a weight module.

[0038] Figure 7 This is the front view of the connecting sleeve.

[0039] Figure 8 This is the right side view of the connecting sleeve.

[0040] Figure 9 This is a top view of the connecting sleeve.

[0041] Figure 10 It is the layering base (square).

[0042] Figure 11 To load the top surface (square).

[0043] Figure 12 It is the layering base (round).

[0044] Figure 13 is the loading top surface (circular).

[0045] Figure 14 This is the cross-section of the bagged concrete slope after the depression is repaired.

[0046] The reference numbers in the figure are: 1-bank slope; 2-water level line; 3-slope top; 4-concrete bag; 5-slope depression area; 6-designed slope line; 7-grouting machine; 8-grouting pipe; 9-grouting hole; 10-counterweight block; 11-main top beam; 12-secondary top beam; 13-ballast module; 14-pressure strip; 15-grouting filling area; 20-pressure column; 21-horizontal hole; 22-pin; 23-lifting ring; 24-bolt; 30-connecting sleeve; 31-vertical sleeve; 32-horizontal sleeve; 33-flange. Specific embodiments

[0047] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0048] Example 1

[0049] This case study is a revetment construction project for a canal project. The project's channel is 8 meters deep, with a silty sand layer 3-4 meters underwater. The revetment structure is bagged concrete. During the bagged concrete construction, the silty sand layer was partially damaged by the surge of the construction vessel, resulting in a 2-meter-high and 3.5-meter-wide depression in the slope after the bagged concrete was formed, requiring reshaping. The original design slope line of the slope in this reshaping area had a slope of 30°, and the present invention was used to perform the slope reshaping. The pressure strip is composed of four welded stainless steel bars measuring 1 meter long, 0.2 meters thick, and 0.2 meters wide. The four pressure columns are made of stainless steel with an outer diameter of 0.15 meters and a height of 5 meters. Each lifting ring can withstand a load of 50 tons and is welded to the top of the pressure column. The main and secondary top beams are also made of stainless steel, with a circular hollow cross-section. The main top beam is connected to the pressure column via a connecting sleeve, and the secondary top beam is bolted to the main top beam. The bottom of the pressure column is bolted to the four corners of the pressure strip. The vertical sleeve, horizontal sleeve, and flange are made of stainless steel and welded together to form a single piece with a thickness of 5 cm. The inner diameter of the vertical sleeve is slightly larger than the outer diameter of the pressure column, at 0.16 m. The inner diameter of the horizontal sleeve is slightly larger than the outer diameter of the main top beam. The vertical sleeve is used to fit over the outside of the pressure column, while the horizontal sleeve is used to fit over the main top beam. Insert the vertical sleeve into the pressure column and insert the pin horizontally to lock the flange, so that the entire connecting sleeve is fixed in place and does not fall down. After all four pressure column connecting sleeves are installed, install the main top beam into the horizontal sleeve and secure it with bolts. Then install the secondary top beam onto the main top beam.

[0050] Secondly, after finding the required grouting position, the grouting pressure is determined according to the formula pre-derived by the present invention: the concrete weight of the mold bag γ c , average thickness D are 30kN / m 3 , 0.35m, water density γ w The average water depth H in the depression area is 10kN / m 3 , 3.5m, and the pressure p0 required to overcome the deformation of the bagged concrete is 10kPa. According to the calculation formula of the present invention, the grouting pressure can be calculated to be 55.5kPa, and the actual control range is between 55 and 60kPa.

[0051] Next, determine the weight of the required counterweight: based on the shear strength of the stratum, the thickness of the mold bag concrete, and the grouting pressure, specifically:

[0052]

[0053] Where G is the weight of the counterweight, the bottom area S and perimeter L of the four pressure columns are 0.071m 2 , 1.88m, the deadweight G0 of the weight module is 27kN, the shear strength of the concrete , stratum shear strength 800kPa and 60kPa respectively. The calculated p·S=4.2kN, which is less than the deadweight G0 of the weight module. Therefore, no counterweight is needed and the module can meet the requirements by itself. Further calculations show that S=56.5kN>G0, ·(S+L·D+π·D 2 )=66.9kN>G0, which meets the verification requirements of bagged concrete failure and slope failure.

[0054] Finally, the loading top surface is built.

[0055] Example 2

[0056] To achieve slope shaping, the main steps of shaping using the above device include:

[0057] Step 1: Use underwater radar to detect the slope surface after the bag concrete is formed, and determine that the slope depression area is 2m high and 3.5m wide. The original design slope line is 30°.

[0058] Step 2: Since the slope collapse area is large, drilling is carried out in the area that needs to be reshaped, with a drilling interval of 0.5m, and grouting holes are installed at the drilling locations and grouting pipes are connected; the grouting pipes are connected to the grouting machine at the top of the slope.

[0059] Step 3: Adjust the position of the connecting sleeve according to the slope inclination to make the loading top surface as horizontal as possible.

[0060] Step 4: Hoist the entire weight module to the concave area of ​​the slope without counterweights, and press the concave area around the slope tightly.

[0061] Step 5: Start the grouting machine and inject the slurry into the depressed area of ​​the slope. The grouting pressure is controlled between 55 and 60 kPa, and the lifting of the mold bag concrete is observed.

[0062] Step 6: After the mold bag concrete is lifted to the original designed slope line, stop grouting and seal the grouting holes.

[0063] Step 7: Lift the counterweight block and the weight module separately to complete the slope shaping.

[0064] Step 8: Repeat steps 1 to 7 to complete the shaping of the entire slope.

[0065] After completing the construction and grouting of the devices in Examples 1 and 2, the grouting volume in the depressed area was estimated to account for 91.7% of the total grouting volume, proving that the grouting method of the present invention effectively prevents slurry loss and has a significant effect on grouting in the complex terrain of the depressed area below the concrete membrane bag.

[0066] The specific positions of the various parts and their interconnected relationships can be clearly seen through the accompanying drawings. These drawings provide visual support for the specific embodiments of the present invention and help to understand its technical principles and practical applications.

[0067] Based on the embodiments of the present invention, all other implementations obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

Claims

1. A device for shaping the depression of a concrete slope, characterized in that: It consists of a weight module and a counterweight block, and the weight module includes: A plurality of independent pressure columns (20), each of which is provided with a plurality of horizontal holes (21), which are distributed at different heights of the pressure columns, and a counterweight (10); a pressure strip (14) is installed at the bottom end of the pressure column (20); A main top beam (11), both ends of which are detachably connected to horizontal holes on different pressure columns through the action of connecting sleeves and pins (22); A secondary top beam (12) is used to connect the counterweight (10) to the main top beam (11), and the main top beam and the secondary top beam form a loading top surface; The counterweight (10) is detachably mounted on the loading top surface; By changing the position of the pressure column on the slope and the distance between different pressure columns, the concave area of ​​the slope is surrounded. By changing the number of counterweights and cooperating with pressure strips to press the four sides of the concave area of ​​the slope, the slurry will not spread during grouting, thereby helping to lift the local grouting in the concave area.

2. The device according to claim 1, characterized in that The connecting sleeve includes a vertical sleeve, a horizontal sleeve, and a flange, which are welded into one body; the inner diameter of the vertical sleeve is larger than the outer diameter of the pressure column, and the inner diameter of the horizontal sleeve is larger than the outer diameter of the main top beam; the vertical sleeve is used to be sleeved outside the pressure column, and the horizontal sleeve is used to be sleeved on the main top beam; After adjusting the height of the connecting sleeve, insert the vertical sleeve into the pressure column, insert the pin into the horizontal hole, and clamp the flange to fix the position of the entire connecting sleeve and prevent it from falling.

3. A method for shaping the depression of a slope surface of a mold bag concrete, characterized in that: The slope depression shaping device according to any one of claims 1 to 2 is used to act on the slope depression area, specifically comprising the following steps: Step 1: Determine the scope of the slope depression area and the original design slope line; Step 2: drilling holes in the sunken area that needs to be reshaped, installing grouting holes, and connecting grouting pipes; the grouting pipes are connected to the grouting machine at the top of the slope; Step 3: Based on the slope inclination and the height difference of the pressure column standing point, before hoisting the weight module as a whole to the slope depression, pre-adjust the connection position of the connecting sleeve on different pressure columns at different heights to ensure that the loading top surface can be in a nearly horizontal position after hoisting; Step 4: hoist the entire weight module to the sunken area on the slope, with the pressure columns distributed around the sunken area and fixed. Then, hoist the counterweight block to the top loading surface. The weight of the counterweight block should be such that after pressing the sunken area on all sides, at least 80% of the total grouting slurry is used to lift the sunken area instead of being lost. Step 5: Grouting. When the bagged concrete is lifted to the original designed slope line, stop grouting and seal the grouting holes. Step 6: let it stand for a period of time to allow the slurry to generate adhesive force, and the adhesive force is sufficient to prevent the slurry from being lost after the weight module is removed; Step 7: Lift the weight module to complete the shaping of the sunken area.

4. The concave shaping method according to claim 3, characterized in that: The weight of the counterweight required is determined by the shear strength of the stratum, the thickness of the bagged concrete, and the grouting pressure. Specifically: Where G is the weight of the counterweight, S and L are the bottom area and perimeter of the pressure column respectively, and G0 is the deadweight of the pressure module. 、 are the shear strength of concrete and the shear strength of stratum respectively, p is the grouting pressure, and D is the average thickness of the bagged concrete.

5. The concave shaping method according to claim 3, characterized in that: The shape of the pressure strip is circular or square; the installation position of the pressure column satisfies: after the pressure column is installed, the pressure strips are connected end to end, and the area surrounded by the pressure strips completely includes the recessed area.

6. The concave shaping method according to claim 3, characterized in that: The grouting slurry is cement slurry or high polymer; the counterweight block is a sand bag, an iron block or a concrete block.

7. Use of the slope depression shaping device according to any one of claims 1 to 2 and the depression shaping method according to any one of claims 3 to 6 in shaping depressions on a slope covered with bagged concrete.

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