A construction method for local shallow advance precipitation of rock foundation

Abstract

The present invention discloses a method for construction of local shallow advance precipitation of rock foundation, comprising the following steps: determining the fissure water area, making PPR vacuum branch pipes, arranging PPR vacuum pipes, backfilling yellow sand and laying geotextiles, connecting water pumps to pump water, pouring cushion layer concrete, waterproofing, constructing protective layers and bottom plates, and disassembling vacuum branch pipes and sealing them, wherein the method for determining the fissure water area is as follows: before cushion layer construction, observing the fissure water situation of the rock foundation, determining the area where the fissure water exists, and the range of the area where the white lime is sprinkled, and making the PPR vacuum branch pipe method is as follows: since the amount of fissure water is usually small, a small diameter PPR pipe with a diameter of 20 mm is selected, and a small hole of 1 mm is opened every 10 cm around the PPR pipe in the longitudinal direction. In the present invention, by pre-burying the vacuum precipitation pipe before pouring the cushion layer, all precipitation pipes are below the cushion layer, and there is no cross-effect on the cushion layer and the waterproof layer, thereby ensuring the continuity and integrity of the cushion layer and the waterproof layer.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a local shallow advance precipitation construction method for a rock foundation. Background Art

[0002] Groundwater in rock foundations mostly exists in the form of bedrock fissure water, mainly in the form of layers and bands in the densely developed bedrock fissures. It has poor water-richness and discontinuous and uneven water levels. This type of foundation pit dewatering usually adopts the open drainage method of setting drainage ditches and collection wells around the foundation pit. However, when local rock joints develop and produce a lot of local groundwater, the drainage ditches around the foundation pit cannot drain the local groundwater, affecting the construction of the cushion layer and waterproofing.

[0003] In the existing process of pouring the concrete cushion layer, a local sump is dug to pump out water, and the concrete cushion layer is poured while pumping water. Before the cushion layer concrete hardens, a large amount of groundwater has been mixed in, resulting in insufficient strength of the cushion layer concrete, and grooves are cut on the cushion layer with water seepage to divert water. However, there will always be visible water in the grooved parts, the base layer is damp, and the waterproof membrane cannot fit with the cushion layer, resulting in the inability to guarantee the quality of the waterproof construction, which poses a hidden danger of leakage in the basement floor. In addition, in the parts of the waterproof layer that are bulging or have the risk of floating, holes are drilled in the waterproof membrane to bury pipes, and water is pumped out with a water pump. When pouring the concrete bottom plate, the buried pipes are sealed with a sealing high seal, forming waterproof weak points at the buried pipes, and there is a risk of water seepage.

[0004] Based on this, we propose a construction method for local shallow advance precipitation of rock foundations. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a construction method for local shallow advance precipitation of rock foundation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for local shallow advance precipitation of rock foundation, comprising the following steps: determining the fissure water area, making PPR vacuum branch pipes, arranging PPR vacuum pipes, backfilling coarse yellow sand and laying geotextiles, connecting water pumps to pump water, pouring cushion concrete, waterproofing, constructing a protective layer and a bottom plate, and disassembling and sealing the PPR vacuum branch pipes;

[0008] Among them, the method of determining the fissure water area is as follows: before the construction of the cushion layer, observe the fissure water situation of the rock foundation, determine the area where the fissure water exists, and the scope of the area where the white lime is sprinkled;

[0009] The method of making PPR vacuum branch pipe is as follows: Since the amount of water in the fissure is usually small, a small diameter PPR pipe with a diameter of 20mm is selected, and small holes of 1mm are opened every 10cm in the longitudinal direction around the PPR pipe. Four small holes are opened in the same cross section, and the PPR pipe is tightly wrapped with a double-layer dense mesh. One end of the PPR pipe is tightly sealed with a special plug, and the other end is not blocked as the water outlet;

[0010] The method for arranging PPR vacuum pipes is as follows: arrange PPR vacuum branches at intervals of 1m in the determined fissure water area, with the water outlet end exceeding the boundary of the fissure water area by at least 50cm. Connect the water outlet ends of all PPR vacuum branches to the 50mm PPR main pipe with a reducer. Seal one end of the PPR main pipe with a special plug and connect the other end to a water pump.

[0011] Preferably, the method of backfilling coarse yellow sand and laying geotextile is as follows: backfill 50 mm thick medium-coarse yellow sand with a mud content of no more than 3% in the fissure water area, and cover the surface of the coarse yellow sand with a layer of geotextile after leveling.

[0012] Preferably, the water pumping method is as follows: connect the water outlet end of the PPR main pipe to the water pump, and start the water pump to pump water.

[0013] Preferably, the method for pouring cushion concrete is as follows: pour cushion concrete on the laid geotextile, and the cushion concrete needs to extend at least 10 cm beyond the designated fissure water area to ensure that a negative pressure area is formed in the yellow sand layer after the water pump is turned on.

[0014] Preferably, the waterproofing method is as follows: after the concrete strength of the cushion layer meets the requirements, observe whether there is water seepage or moisture on the cushion layer. If there is no moisture, construct the waterproof layer.

[0015] Preferably, the method for constructing the protective layer and the base plate is as follows: after the waterproof construction is completed, the waterproof protective layer and the base plate are constructed.

[0016] Preferably, the method for disassembling and sealing the PPR vacuum branch pipe is as follows: after the strength of the concrete base plate reaches the design requirements, stop precipitation, then pull out the PPR vacuum branch pipe, and use concrete to pour the holes left by the PPR vacuum branch pipe to ensure strength.

[0017] A local shallow advance precipitation construction device for a rock foundation comprises: a rock layer, the upper end of the rock layer is covered with a coarse yellow sand layer, the upper end of the coarse yellow sand layer is covered with a geotextile layer, and the upper end surface of the geotextile layer is poured with a concrete layer;

[0018] A construction mechanism, the construction mechanism includes a PPR vacuum branch pipe, a PPR main pipe, a sliding rod, an arc-shaped slide plate, an arc-shaped support plate, a spring and a fixing component. The PPR vacuum branch pipe is buried in a coarse yellow sand layer. The other end of the PPR vacuum branch pipe penetrates the side wall of the concrete layer and is fixedly connected to the PPR main pipe. The PPR vacuum branch pipe is connected to the PPR main pipe. The upper end of the PPR vacuum branch pipe penetrates and is slidably connected with a plurality of sliding rods. The lower ends of the plurality of sliding rods are fixedly connected to the arc-shaped slide plate. The upper ends of the plurality of sliding rods are fixedly connected to the arc-shaped support plate. A plurality of springs are fixedly connected between the top of the PPR vacuum branch pipe and the upper end of the arc-shaped slide plate. The side wall of the arc-shaped support plate is provided with a fixing component.

[0019] Preferably, the fixing assembly comprises a connecting seat fixedly connected to the side wall of the arc-shaped support plate, the side wall of the connecting seat is threadedly connected with a threaded rod, and the upper end of the PPR vacuum branch pipe is provided with a threaded groove cooperating with the threaded rod.

[0020] Preferably, the PPR vacuum branch pipe is made of a PPR pipe with a diameter of 20 mm, and the PPR main pipe is made of a PPR pipe wrapped with a double-layer dense mesh.

[0021] The present invention has the following beneficial effects:

[0022] 1. This scheme embeds vacuum downpipes before pouring the cushion layer. All downpipes are below the cushion layer, which has no cross-effect on the cushion layer and the waterproof layer, thus ensuring the continuity and integrity of the cushion layer and the waterproof layer.

[0023] 2. Pre-watering to lower the local fissure water level below the cushion layer, thus avoiding the impact of groundwater on the construction of the cushion layer and waterproof layer, ensuring the construction quality of the cushion layer and waterproof layer, and avoiding bulging and floating of the waterproof layer before the bottom plate construction;

[0024] 3. By setting up a construction mechanism, after the precipitation ends, the arc support plate can be pressed down to form a certain gap between the arc support plate and the coarse yellow sand layer, and then the entire PPR vacuum branch pipe can be pulled out, and then poured with concrete to seal it, which can effectively prevent the PPR vacuum branch pipe from remaining in the coarse yellow sand layer and increase the strength of the building;

[0025] 4. The materials used in this scheme are simple and easy to obtain, can be found at the construction site, are easy to use, and are simple to assemble. Ordinary workers can simply assemble and disassemble them, and the structure is simple;

[0026] 5. It is highly practical and can be used on all rock foundations. The water pump forms negative pressure in the branch pipe and the coarse yellow sand layer, which greatly improves the precipitation efficiency and has a significant precipitation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1This is a structural schematic diagram of a local shallow advance precipitation construction device for rock foundation proposed by the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure enlargement at point A;

[0029] Figure 3 for Figure 1 A schematic diagram of the structure at B in FIG.

[0030] Figure 4 for Figure 1 Schematic diagram of the structure of the PPR vacuum branch pipe;

[0031] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the PPR main pipe.

[0032] In the figure: 1 rock layer, 2 coarse yellow sand layer, 3 geotextile layer, 4 concrete layer, 5 PPR vacuum branch pipe, 6 PPR main pipe, 7 sliding rod, 8 arc-shaped sliding plate, 9 arc-shaped supporting plate, 10 spring, 11 connecting seat, 12 threaded rod, 13 threaded groove. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] Reference Figure 1-Figure 5, a local shallow advance precipitation construction method for rock foundation, comprising the following steps: determining the fissure water area, making PPR vacuum branch pipes, arranging PPR vacuum pipes, backfilling coarse yellow sand and laying geotextiles, connecting water pumps to pump water, pouring cushion concrete, waterproofing, constructing protective layers and bottom plates, and disassembling and sealing PPR vacuum branch pipes;

[0037] Among them, the method of determining the fissure water area is as follows: before the construction of the cushion layer, observe the fissure water situation of the rock foundation, determine the area where the fissure water exists, and the scope of the area where the white lime is sprinkled;

[0038] The method of making PPR vacuum branch pipe is as follows: Since the amount of water in the fissure is usually small, a small diameter PPR pipe with a diameter of 20mm is selected, and small holes of 1mm are opened every 10cm in the longitudinal direction around the PPR pipe. Four small holes are opened in the same cross section, and the PPR pipe is tightly wrapped with a double-layer dense mesh. One end of the PPR pipe is tightly sealed with a special plug, and the other end is not blocked as the water outlet;

[0039] The method for arranging PPR vacuum pipes is as follows: arrange PPR vacuum branches at intervals of 1m in the determined fissure water area, with the water outlet end exceeding the boundary of the fissure water area by at least 50cm. Connect the water outlet ends of all PPR vacuum branches to the 50mm PPR main pipe with a reducer. Seal one end of the PPR main pipe with a special plug and connect the other end to a water pump.

[0040] The method of backfilling coarse yellow sand and laying geotextile is as follows: backfill 50mm thick medium-coarse yellow sand with a mud content of no more than 3% in the fissure water area, and cover the surface of the coarse yellow sand with a layer of geotextile after leveling.

[0041] The method of pumping water with a water pump is as follows: connect the water outlet of the PPR main pipe to the water pump and turn on the water pump to pump water.

[0042] The method for pouring cushion concrete is as follows: pour cushion concrete on the laid geotextile. The cushion concrete needs to exceed the designated fissure water area by at least 10 cm on all sides to ensure that a negative pressure area is formed in the yellow sand layer after the water pump is turned on.

[0043] The waterproofing method is as follows: After the concrete strength of the cushion layer meets the requirements, observe whether there is water seepage or moisture on the cushion layer. If there is no moisture, construct the waterproof layer.

[0044] The method for constructing the protective layer and base plate is as follows: After the waterproof construction is completed, start constructing the waterproof protective layer and base plate.

[0045] The method of dismantling and sealing the PPR vacuum branch pipe is as follows: After the strength of the concrete base plate reaches the design requirements, stop precipitation, then pull out the PPR vacuum branch pipe, and use concrete to pour the holes left by the PPR vacuum branch pipe to ensure strength.

[0046] A local shallow advance precipitation construction device for a rock foundation comprises: a rock layer 1, the upper end of the rock layer 1 is covered with a coarse yellow sand layer 2, the upper end of the coarse yellow sand layer 2 is covered with a geotextile layer 3, and the upper end surface of the geotextile layer 3 is poured with a concrete layer 4;

[0047] The construction mechanism includes a PPR vacuum branch pipe 5, a PPR main pipe 6, a sliding rod 7, an arc-shaped slide plate 8, an arc-shaped support plate 9, a spring 10 and a fixed component. The PPR vacuum branch pipe 5 is buried in the coarse yellow sand layer 2. The other end of the PPR vacuum branch pipe 5 passes through the side wall of the concrete layer 4 and is fixedly connected to the PPR main pipe 6. The PPR vacuum branch pipe 5 is connected to the PPR main pipe 6. The upper end of the PPR vacuum branch pipe 5 passes through a plurality of sliding rods 7 for sliding connection. The lower ends of the plurality of sliding rods 7 are commonly fixedly connected to the arc-shaped slide plate 8. The upper ends of the plurality of sliding rods 7 are commonly fixedly connected to the arc-shaped support plate 9. A plurality of springs 10 are commonly fixedly connected between the top of the PPR vacuum branch pipe 5 and the upper end of the arc-shaped slide plate 8. A fixed component is arranged on the side wall of the arc-shaped support plate 9.

[0048] The fixing assembly includes a connection seat 11 fixedly connected to the side wall of the arc-shaped support plate 9 , the side wall of the connection seat 11 is threadedly connected with a threaded rod 12 , and the upper end of the PPR vacuum branch pipe 5 is provided with a threaded groove 13 that cooperates with the threaded rod 12 .

[0049] The PPR vacuum branch pipe 5 is made of a PPR pipe with a diameter of 20 mm, and the PPR main pipe 6 is made of a PPR pipe wrapped with a double-layer dense mesh.

[0050] In the present invention, the fissure water area is first determined. Before the cushion layer is constructed, the fissure water situation of the rock foundation is observed to determine the area where the fissure water exists and the range of the area where the white lime is sprinkled. Then, the PPR vacuum branch pipe 5 and the PPR main pipe 6 are made. Since the amount of fissure water is usually small, the PPR vacuum branch pipe 5 uses a small-diameter PPR pipe with a diameter of 20 mm. Small holes of 1 mm are opened every 10 cm longitudinally around the PPR pipe, and 4 small holes are opened in the same cross-section. The PPR main pipe 6 uses a double-layer dense mesh to tightly wrap the PPR pipe, and one end is tightly sealed with a special plug, and the other end is not blocked as a water outlet.

[0051] Arrange PPR vacuum branch pipes 5 and PPR main pipes 6. Arrange PPR vacuum branch pipes 5 at intervals of 1m in the determined fissure water area. The water outlet end should exceed the boundary of the fissure water area by at least 50cm. Connect the water outlet ends of all PPR vacuum branch pipes 5 to the 50mm PPR main pipe 6 with reducers. Block one end of the PPR main pipe 6 with a special plug and connect the other end to a water pump.

[0052] Then backfill the coarse yellow sand layer 2, and backfill 50mm thick medium-coarse yellow sand with a mud content of no more than 3% in the fissure water area. After leveling, cover the surface of the coarse yellow sand layer 2 with a layer of geotextile to form a geotextile layer 3, and then connect the water outlet end of the PPR main pipe 6 to the water pump, and start the water pump to pump water.

[0053] Pour the concrete layer 4 and the cushion concrete on the laid geotextile layer 3. The concrete layer 4 needs to exceed the designated fissure water area by at least 10 cm on all sides to ensure that a negative pressure area is formed in the coarse yellow sand layer 2 after the water pump is turned on. After the strength of the concrete layer 4 meets the requirements, observe whether there is water seepage or moisture on the cushion layer. If there is no moisture, construct the waterproof layer. After the waterproof construction is completed, start constructing the waterproof protective layer and base plate.

[0054] After the strength of the concrete base plate reaches the design requirements, stop the precipitation, and then press the arc support plate 9 downward to form a gap between the arc support plate 9 and the coarse yellow sand layer 2, and then turn the threaded rod 12 into the thread groove 13 to fix the position of the arc support plate 9. Then the PPR vacuum branch pipe 5 can be pulled out of the coarse yellow sand layer 2, and the holes left by the PPR vacuum branch pipe 5 can be poured with concrete to ensure the strength of the cushion layer.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for local shallow advance precipitation construction of rock foundation, characterized in that: The construction method adopts the following construction mechanism: The construction mechanism includes a PPR vacuum branch pipe, a PPR main pipe, a sliding rod, an arc-shaped slide plate, an arc-shaped support plate, a spring and a fixing component. The PPR vacuum branch pipe is buried in the coarse yellow sand layer. The other end of the PPR vacuum branch pipe penetrates the side wall of the concrete layer and is fixedly connected to the PPR main pipe. The PPR vacuum branch pipe is connected to the PPR main pipe. The upper end of the PPR vacuum branch pipe penetrates and is slidably connected with a plurality of sliding rods. The lower ends of the plurality of sliding rods are fixedly connected to the arc-shaped slide plate. The upper ends of the plurality of sliding rods are fixedly connected to the arc-shaped support plate. A plurality of springs are fixedly connected between the top of the PPR vacuum branch pipe and the upper end of the arc-shaped slide plate. The side wall of the arc-shaped support plate is provided with a fixing component. in: The fixing assembly includes a connection seat fixedly connected to the side wall of the arc-shaped support plate, the side wall of the connection seat is threadedly connected with a threaded rod, and the upper end of the PPR vacuum branch pipe is provided with a threaded groove matching the threaded rod; The construction steps are as follows: Determine the fissure water area, make PPR vacuum branch pipes, arrange PPR vacuum branch pipes, backfill with coarse yellow sand and lay geotextiles, connect water pumps to pump water, pour cushion concrete, waterproof, construct protective layer and bottom plate, and dismantle and seal PPR vacuum branch pipes; Among them, the method of determining the fissure water area is as follows: before the construction of the cushion layer, observe the fissure water situation of the rock foundation, determine the area where the fissure water exists, and the scope of the area where the white lime is sprinkled; The method of making PPR vacuum branch pipe is as follows: Since the amount of water in the fissure is usually small, a small diameter PPR pipe with a diameter of 20mm is selected, and small holes of 1mm are opened every 10cm in the longitudinal direction around the PPR pipe. Four small holes are opened in the same cross section, and the PPR pipe is tightly wrapped with a double-layer dense mesh. One end of the PPR pipe is tightly sealed with a special plug, and the other end is not blocked as the water outlet; The method for arranging PPR vacuum branches is as follows: arrange PPR vacuum branches at intervals of 1m in the determined fissure water area, with the water outlet end exceeding the boundary of the fissure water area by at least 50cm. Connect the water outlet ends of all PPR vacuum branches to the 50mm PPR main pipe with a reducer. One end of the PPR main pipe is sealed with a special plug, and the other end is connected to a water pump.

2. A method for local shallow advance precipitation of rock foundation according to claim 1, characterized in that: The method of backfilling coarse yellow sand and laying geotextile is as follows: Backfill 50mm thick medium-coarse yellow sand with a mud content not exceeding 3% in the fissure water area, and cover the surface of the coarse yellow sand with a layer of geotextile after leveling.

3. A method for local shallow advance precipitation of rock foundation according to claim 2, characterized in that: The water pumping method is as follows: Connect the water outlet of the PPR main pipe to the water pump and turn on the water pump to pump water.

4. A method for local shallow advance precipitation of rock foundation according to claim 3, characterized in that: The method of pouring cushion concrete is as follows: Pour cushion concrete on the laid geotextile. The cushion concrete needs to extend at least 10cm beyond the designated fissure water area to ensure that a negative pressure area is formed in the coarse yellow sand layer after the water pump is turned on.

5. A method for local shallow advance precipitation of rock foundation according to claim 4, characterized in that: The waterproofing method is as follows: After the concrete strength of the cushion layer meets the requirements, observe whether there is water seepage or moisture on the cushion layer. If there is no moisture, construct the waterproof layer.

6. A method for local shallow advance precipitation of rock foundation according to claim 5, characterized in that: The methods for constructing the protective layer and base plate are as follows: After the waterproofing construction is completed, the construction of the waterproof protective layer and base plate begins.

7. A method for local shallow advance precipitation of rock foundation according to claim 6, characterized in that: The method of disassembling and plugging the PPR vacuum branch pipe is as follows: After the strength of the concrete base plate reaches the design requirements, stop the precipitation, then pull out the PPR vacuum branch pipe, and use concrete to pour the holes left by the PPR vacuum branch pipe to ensure strength.

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