Mold bag concrete slope depression shaping device and method

Abstract

A mold bag concrete slope depression shaping device is characterized in that the mold bag concrete slope depression shaping device is composed of a ballasting module and a balancing weight, and the ballasting module comprises a plurality of independent pressing columns, a main top beam, a secondary top beam and the balancing weight; a plurality of horizontal holes are formed in each pressing column, and the horizontal holes are distributed at different heights of the pressing columns; pressing strips are installed at the bottom ends of the pressing columns. The two ends of the main top beam are detachably connected with the horizontal holes in the different pressing columns under the action of connecting sleeves and bolt pins. The secondary top beam is used for connecting the balancing weight to the main top beam, and the main top beam and the secondary top beam form a loading top surface; the balancing weight is detachably mounted on the loading top surface; by changing the positions of the pressing columns on the slope surface and changing the distance between the different pressing columns, the concave area of the slope surface is surrounded, the number of the balancing weights is changed, and the periphery of the concave area of the slope surface is pressed by matching with the pressing strips, so that grout is not diffused during grouting, and local grouting lifting of the concave area is facilitated. The device can adjust the height of the loading top surface to adapt to different slope conditions, and is high in practicability; and arrangement is simple, hoisting is convenient, and efficiency is high.

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 mold bag concrete. Background Art

[0002] Water diversion projects have played a major role in the dispatch of regional water resources in my country and in alleviating regional water resource tensions. In addition, water transport projects will greatly reduce the transportation costs of social materials due to their extremely low transportation costs. Therefore, my country has recently vigorously developed water conservancy projects, and a large number of water conservancy projects have been completed, are under construction, or are being planned, such as the Pinglu Canal Project under construction, and the Xianggui Canal Project and the Zhejiang-Jiangxi Canal Project under planning and implementation. These projects are inseparable from the revetment of the river. Bag concrete is one of the most important forms of modern revetment projects because of its advantages such as fast construction speed and underwater construction. However, during the construction of the bank slope, the initial slope of the revetment is often destroyed by the ship waves generated by the construction ships, forming an initial depression, especially in the sandy soil layer. After laying the mold bags and pouring concrete on the concave slope of the revetment, a concave slope will be formed, affecting the quality of the project. In order to form a high-quality revetment structure, it is often necessary to shape the concave area of ​​the slope of the bag concrete.

[0003] At present, the only method for shaping the depressed areas of the slope surface of the mold bag concrete is to lift the depressed areas by the grouting method. 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 be lifted, but the depressed area cannot be lifted. In actual projects, when such depressions occur, the entire mold bag can only be peeled off, the slope can be re-reinforced, and then covered with mold bag concrete. Therefore, the current grouting 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. At present, there is a lack of means to solve the problem of slurry running at the interface between the mold bag and the soil. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for shaping the depression of a mold bag concrete slope surface, by setting a layer around the depression area of ​​the slope surface, and applying gravity on the layer by a pressure column, the load on the top surface of the load is transferred to the layer, so that the grouting slurry does not spread to other areas, thereby realizing the rapid shaping of the mold bag concrete slope surface after the local depression. The present invention has the advantages of strong practicality, strong applicability, low cost, high construction efficiency, and good shaping effect, and is particularly suitable for the depression of the mold bag concrete slope surface that needs to be shaped.

[0005] 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 mold bag concrete.

[0006] The present invention has the following technical effects:

[0007] 1. The device designed by the present invention can adjust the height of the loading top surface, adapt to different slope conditions, and has strong practicality; 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.

[0008] 2. The present invention sets pressure strips in the collapsed area of ​​the slope and uses different numbers of counterweights to prevent the grouting slurry from flowing everywhere. While ensuring the grouting effect, it is also beneficial to reduce the amount of grouting slurry used and reduce the grouting cost, while also being environmentally friendly.

[0009] 3. The present invention also provides the gravity applied by the device when constructing on the membrane bag concrete, including the weight of the applied counterweight block, to provide a quantifiable basis for actual operation.

[0010] 4. The present invention is applicable to both underwater construction and dry land construction, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a picture of the uneven surface after pouring the actual mold bag concrete.

[0012] Figure 2 This is a cross-sectional view of the slope depression of the bagged concrete caused by local instability of the silty soil layer.

[0013] Figure 3 This is the front view of the slope depression of the bagged concrete caused by the local instability of the silty soil layer.

[0014] Figure 4 This is a cross-sectional view of the depression on the slope of the mold bag concrete.

[0015] Figure 5 This is a horizontal view of repairing the depression on the slope of the mold bag concrete.

[0016] Figure 6 It is a weight module.

[0017] Figure 7 This is a front view of the connecting sleeve.

[0018] Figure 8 This is the right side view of the connecting sleeve.

[0019] Fig. 9 A top view of the connecting sleeve.

[0020] Fig.10 It is the layering base (square).

[0021] Fig.11 To load the top surface (square).

[0022] Fig.12 It is the layering base (round).

[0023] Fig.13 is the loading top surface (circular).

[0024] Fig.14 This is the cross-section of the mold bag concrete slope after the depression is repaired.

[0025] The reference numbers in the figure are: 1-bank slope; 2-water level line; 3-slope top; 4-mold bag concrete; 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

[0026] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0027] Example 1

[0028] This implementation case is a canal engineering channel revetment construction project. The engineering channel is 8m deep, and there is a silty sand layer within the range of 3m-4m underwater. The revetment structure is a mold bag concrete. When constructing the mold bag concrete, the silty sand layer was partially damaged due to the surge of the construction ship, resulting in a 2m high and 3.5m wide slope depression area after the mold bag concrete was formed, which needed to be shaped. The slope of the original design slope line of the slope in the shaping area was 30°, and the present invention was used to shape the slope. The pressure strip is composed of 4 stainless steel bars with a size of 1m long, 0.2m thick, and 0.2 wide welded together, and the 4 pressure columns are stainless steel with an outer diameter of 0.15m and a height of 5m; each lifting ring can withstand a load of 50t and is welded to the top of the pressure column. The main top beam and the secondary top beam are also made of stainless steel, with a circular hollow cross-section; the main top beam is connected to the pressure column through a connecting sleeve, and the secondary top beam is connected to the main top beam by bolts. The bottom of the pressure column is fixed to the four corners of the pressure strip by bolts. The vertical sleeve, horizontal sleeve, and flange are made of stainless steel. The three are welded together to form a whole with a thickness of 5 cm. The inner diameter of the vertical sleeve is slightly larger than the outer diameter of the pressure column, which is 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 be sleeved outside the pressure column, and the horizontal sleeve is used to be sleeved on the main top beam. Put the vertical sleeve into the pressure column, insert it horizontally through the pin, and clamp the flange so that the position of the entire connecting sleeve is fixed and does not fall down. After the four pressure column connecting sleeves are installed, install the main top beam into the horizontal sleeve and fix it with bolts; then install the secondary top beam on the main top beam.

[0029] 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 10 kN / m 3 , 3.5m, the pressure p0 required to overcome the deformation of the mold bag concrete is 10kPa. According to the calculation formula of the present invention, the grouting pressure can be calculated to be 55.5kPa, which is actually controlled between 55 and 60kPa.

[0030] Next, determine the weight of the counterweight required: according to the shear strength of the stratum, the thickness of the mold bag concrete, and the grouting pressure, specifically:

[0031]

[0032] Where G is the weight of the counterweight, and 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, and the shear strength of concrete is τ c , stratum shear strength τ s They are 800kPa and 60kPa respectively. The calculated p·S=4.2kN 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 calculation shows that τ c S=56.5kN>G0、τ s ·(S+L·D+π·D 2 )=66.9kN>G0, which meets the verification requirements of bag concrete failure and slope failure.

[0033] Finally, the loading top surface is built.

[0034] Example 2

[0035] To achieve slope shaping, the main steps of shaping using the above device include:

[0036] Step 1: Use underwater radar to detect the slope after the mold bag concrete is formed, and determine that the slope depression area is 2m high and 3.5m wide, and the original design slope line is 30°.

[0037] Step 2: As the area of ​​slope collapse is large, holes are drilled in the area that needs shaping, with a drilling interval of 0.5m. 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.

[0038] Step 3: Adjust the position of the connecting sleeve according to the slope inclination to make the loading top surface as horizontal as possible.

[0039] Step 4: hoist the entire weight-bearing module to the sunken area on the slope without counterweights, and press the sunken area around the slope tightly.

[0040] 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.

[0041] Step 6: After the mold bag concrete is lifted to the original designed slope line, stop grouting and seal the grouting holes.

[0042] Step 7, lift the counterweight block and the weight module separately to complete the slope shaping.

[0043] Step 8: Repeat steps 1 to 7 to complete the shaping of the entire slope.

[0044] 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 and controls slurry loss and has a significant effect on the grouting of the complex terrain of the depressed area below the concrete membrane bag.

[0045] The specific positions of the various parts and their interconnected relationships can be clearly seen through the accompanying drawings. These illustrations provide visual support for the specific embodiments of the present invention and are helpful for understanding its technical principles and practical applications.

[0046] 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 mold bag concrete slope, characterized in that: It is composed 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), the horizontal holes being 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 a loading top surface is formed by the main top beam and the secondary top beam; The counterweight block (10) is detachably mounted on the loading top surface; By changing the position of the pressure column on the slope and changing the distance between different pressure columns, the depressed area of ​​the slope is surrounded. By changing the number of counterweights and cooperating with pressure strips to press the depressed area around the slope, the slurry does not spread during grouting, thereby helping to lift the local grouting 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 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 shaped, installing grouting holes, and connecting grouting pipes; the grouting pipes are connected to the grouting machine at the top of the slope; Step 3: According to the slope inclination angle and the height difference of the pressure column standing point, before hoisting the weight module as a whole to the slope depression area, pre-adjust the connection position of the connecting sleeve at different heights on different pressure columns to ensure that the loading top surface can be in an approximately horizontal position after hoisting; Step 4: hoist the weight module as a whole to the sunken area of ​​the slope, distribute the pressure columns around the sunken area and fix them, and then hoist the counterweight block to the top surface of the load. The weight of the counterweight block satisfies that: after pressing the sunken area around the slope, at least 80% of the total amount of grouting slurry is used to lift the sunken area of ​​the slope instead of losing; Step 5: Grouting: When the mold bag concrete is lifted to the original designed slope line, stop grouting and seal the grouting holes; Step 6, standing still for a period of time, so that the slurry generates 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 depression shaping method according to claim 3, characterized in that: The grouting pressure is determined according to the water pressure in the depression area and the thickness of the mold bag concrete: c D+γ w H+p0, where p is the grouting pressure, γ c and D are respectively the concrete weight and average thickness of the mold bag, γ w and H are water density and average water depth in the depressed area respectively; p0 is the pressure required to overcome the deformation of the mold bag concrete, which can be taken as 10-20 kPa according to actual conditions.

5. The ballast module according to claim 3, characterized in that: The weight of the counterweight required is determined according to the shear strength of the stratum, the thickness of the mold bag 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, G0 is the deadweight of the pressure weight module, τ c , τ s They are concrete shear strength and stratum shear strength respectively.

6. 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 that: 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.

7. The concave shaping method according to claim 4, characterized in that: The grouting slurry is cement slurry or high polymer; The depression shaping method according to claim 1 is characterized in that the counterweight block is a sandbag, an iron block or a concrete block.

8. 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 7 in shaping depressions on a slope covered with bagged concrete.

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