Permanent and temporary combined active drainage anti-floating construction method based on BIM technology
By using BIM technology and galvanized steel filter pipes in underground construction combined with active drainage and anti-floating construction methods, the problem of groundwater affecting construction is solved, effective groundwater discharge and construction drying is achieved, and construction quality and operation safety are ensured.
Patent Information
- Application Number
- CN202411476169.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-02-25
AI Technical Summary
During underground construction, due to the low permeability coefficient of the foundation rock and soil and the large foundation pit area, existing drainage measures (such as open drainage ditches and precipitation wells) cannot effectively remove groundwater, which seriously affects the construction of concrete cushion layer and foundation bottom plate.
Using Yonglin combined with active drainage and anti-floating construction method based on BIM technology, the groundwater is collected by setting up galvanized steel filter pipes under each column pier and combining the gravel layer as the anti-filtration layer, and water is pumped through a self-priming pump to ensure that the groundwater level is located below the foundation cushion layer. At the same time, PPR horizontal drainage pipes and automatic water pumping systems are set up to achieve effective groundwater discharge.
It effectively reduces the interference of groundwater on foundation construction, solves the problem of slow groundwater collection, reduces construction difficulty and project volume, ensures dry construction of concrete cushion layer and foundation bottom plate, and avoids damage to the building due to rising groundwater levels during the operation period.
Smart Images
Figure CN119507487A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of anti-floating of underground engineering, and in particular to a permanent and temporary combined active drainage anti-floating construction method based on BIM technology. Background Art
[0002] With the rapid development of urban construction, the utilization of underground space has received more and more attention. As a result, the anti-floating problem of underground projects has become increasingly prominent.
[0003] During foundation construction, when the groundwater level is high, temporary precipitation wells are generally used to lower the groundwater level to ensure that the construction pit is dry and can be constructed. Sometimes, the geological survey report shows that there is no groundwater, but there is a small amount of water after excavation, and the permeability coefficient is very low, which seriously affects the construction of the foundation slab. The precipitation well cannot effectively collect and drain water underground. Open ditch drainage needs to be set up around the foundation pit, requiring groundwater to flow to the open ditch, which is not suitable for large-area foundation pits. Although blind ditch drainage can collect seepage water in the soil and collect and drain it, for soils with very low permeability coefficients, a large number of blind ditches need to be designed and buried in the soil under the slab. The engineering volume is huge and cannot be repaired, so it is not suitable for permanent drainage. It is not economical to set up pull-out piles or anti-floating anchors to prevent the structure from encountering extreme climate during the operation stage, which causes the groundwater level to rise, and the length and number of the setting are difficult to predict.
[0004] During the construction of underground projects, due to the low permeability coefficient of the foundation rock and soil and the large area of the foundation pit, the exposed drainage ditches and precipitation wells cannot effectively drain the groundwater, which seriously affects the construction of the concrete cushion layer and the foundation slab, and becomes a construction difficulty. Summary of the invention
[0005] In order to overcome the technical defects in the existing underground engineering construction process, due to the low permeability coefficient of foundation rock and soil, the large foundation pit area, the open drainage ditches and precipitation wells cannot effectively drain groundwater, which seriously affects the construction of concrete cushion layer and foundation bottom plate, the present invention provides a permanent and temporary combined active drainage and anti-floating construction method based on BIM technology.
[0006] The present invention provides a permanent and temporary combined active drainage and anti-floating construction method based on BIM technology, the steps are: Step 1: Set a galvanized steel filter pipe under each pier, weld a steel plate water stop ring on the outer wall of the galvanized steel filter pipe, extend the galvanized steel filter pipe under the steel plate water stop ring into the corresponding sump, collect groundwater through the galvanized steel filter pipe, fill the area around the galvanized steel filter pipe with a crushed stone layer with a particle size of 10-30mm as an anti-filtration layer, and then pour a concrete cushion layer, with a smooth transition between the pipe root and the plane where the cushion layer is located; Step 2: On the completed concrete cushion, a reinforced waterproof layer is constructed along the circumference of the galvanized steel filter tube. The material is the same as the overall waterproof layer. First, apply a layer of waterproof coating, then lay the waterproof layer, and then construct the overall waterproof layer. The height of the waterproof layer covering the galvanized steel filter tube is 150mm. Pour a concrete protective layer on the waterproof layer. Step 3: During the concrete cushion and waterproofing construction, a self-priming pump is used to push the pipe head deep into the galvanized steel filter pipe to continuously pump water, and timely extract the seepage water in the foundation soil to ensure that the groundwater level is below the foundation cushion and the concrete cushion construction is dry; Step 4: After the construction of the foundation slab is completed, the top of the galvanized steel filter pipe is 50-80mm higher than the foundation top plate. The top of the galvanized steel filter pipe is welded with a sealing plate, and the galvanized steel pipe and plug are welded on the side of the galvanized steel filter pipe. Observe the remaining water output of the drainage pipe and whether the groundwater can be connected. If not, clean it up in time. Step 5. Arrange a PPR horizontal drainage pipe on the foundation slab in the upper ground layer of the foundation slab. The PPR horizontal drainage pipe includes a horizontal branch pipe and a horizontal main pipe. The galvanized steel pipe welded on the side wall of the galvanized steel filter pipe is used as a tee pipe. Each galvanized steel pipe is connected to a horizontal branch pipe. All horizontal branches are connected to the horizontal main pipe. The accumulated water in the galvanized steel filter pipe is led to the nearest water collection well in the area through the PPR horizontal drainage pipe, and then discharged to the above-ground municipal rainwater well through the automatic pumping system in the water collection well. Step 6. Use BIM technology to record the position of the tee on the galvanized steel filter pipe. When the water volume is too large during the operation period and the horizontal main pipe is not drained in time, you can find the position of the tee on each galvanized steel filter pipe, disconnect the tee from the horizontal branch pipe, and drain the water freely into the collection well. Then, through the automatic pumping system in the collection well, drain it into the above-ground municipal rainwater well.
[0007] Preferably, in step one, the thickness of the steel plate water stop ring is 4 mm.
[0008] Compared with the prior art, the technical solution provided by the present invention has the following technical effects: by adopting the construction method, a galvanized steel pipe filter pipe is arranged under each pier, and groundwater is collected through the filter pipe, thereby reducing the interference of groundwater on foundation construction, solving the problem of slow groundwater collection, inability to discharge precipitation in a concentrated manner, and the need to arrange a large number of drainage ditches or water collection wells, thereby ensuring the construction progress; only the galvanized steel pipe filter pipe is buried under the foundation slab, and the groundwater collection main pipe is placed on the foundation slab, which is convenient for the maintenance and replacement of horizontal drainage pipes during the use phase, thereby avoiding the disadvantage that a large number of blind ditches are arranged under the foundation slab and cannot be maintained; avoiding the hidden danger of partial or overall floating of the basement due to large fluctuations in groundwater pressure in a short period of time due to seasonal or extreme weather outbreaks such as heavy rain, breaking through the anti-floating water level, or improper process measures during construction, thereby ensuring the continuous discharge of groundwater in extreme weather during the operation phase, and not causing damage to the building due to rising groundwater levels. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.
[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0011] Figure 1 It is a schematic diagram of the connection structure of a galvanized steel filter pipe, a water collection well, and a horizontal main pipe and a branch pipe of a permanent and temporary combined active drainage anti-floating construction method based on BIM technology described in an embodiment of the present invention; Figure 2 The figure is a schematic diagram of the connection between the galvanized steel filter pipe and the horizontal branch pipe in an embodiment of the present invention.
[0012] In the figure: 1. foundation slab; 2. pier; 3. water collection well; 4. galvanized steel filter pipe; 41. upper section; 42. lower section; 43. water filtering section; 44. sealing plate; 5. horizontal branch pipe; 6. horizontal main pipe; 7. tee; 8. steel plate water stop ring. DETAILED DESCRIPTION
[0013] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0014] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.
[0015] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0016] In one embodiment, Figure 1 As shown, a construction method for active drainage and anti-floating combined with permanent temporary construction based on BIM technology is disclosed, and the steps are as follows: Step 1, a DN110 galvanized steel filter tube 4 is arranged under each column pier 2, a steel plate water stop ring 8 is welded on the outer wall of the galvanized steel filter tube 4, the galvanized steel filter tube 4 below the steel plate water stop ring 8 is extended into the corresponding sump, groundwater is collected through the galvanized steel filter tube 4, a crushed stone layer with a particle size of 10-30 mm is filled around the galvanized steel filter tube 4 as an anti-filter layer, and then a C15 concrete cushion layer is poured, wherein the pipe root and the plane where the cushion layer is located have a smooth transition, and the cross section of the smooth transition area is an arc corresponding to a radius of 15 mm; Step 2: On the completed concrete cushion, a reinforced waterproof layer is constructed along the circumference of the galvanized steel filter tube 4. The material is the same as the overall waterproof layer. First, a layer of waterproof coating is applied, and then the waterproof layer is laid. The width of the waterproof layer is about 300mm, that is, 150mm on the plane and 150mm on the vertical surface. Then, the overall waterproof layer is constructed. The height of the waterproof layer covering the galvanized steel filter tube 4 is 150mm. Pour a 50mmC25 concrete protective layer on the waterproof layer. Step 3: During the concrete cushion and waterproofing construction, a self-priming pump is used to continuously pump water into the galvanized steel filter pipe 4 to timely extract the seepage water in the base soil, ensure that the groundwater level is below the foundation cushion, and ensure that the concrete cushion construction is dry; Step 4: After the construction of the foundation bottom plate 1 is completed, the top of the galvanized steel filter tube 4 is 50-80mm higher than the foundation top plate. A sealing plate 44 is welded to the top of the galvanized steel filter tube 4, and a DN32 galvanized steel pipe with a plug is welded on the side of the galvanized steel filter tube 4. Observe the remaining water flow of the drainage pipe and whether the groundwater can be connected. If not, clean it up in time. Step 5: Arrange a PPR horizontal drainage pipe on the foundation slab 1 in the upper ground layer of the foundation slab. The PPR horizontal drainage pipe includes a horizontal branch pipe 5 and a horizontal main pipe 6. The galvanized steel pipe welded on the side wall of the galvanized steel filter pipe 4 is used as a tee pipe 7. Each galvanized steel pipe is connected to a horizontal branch pipe 5. All horizontal branch pipes 5 are connected to the horizontal main pipe 6. The accumulated water in the galvanized steel filter pipe 4 is led to the nearest water collection well 3 in the area through the PPR horizontal drainage pipe, and then discharged to the above-ground municipal rainwater well through the automatic pumping system in the water collection well 3. Step 6. Use BIM technology to record the position of the tee 7 on the galvanized steel filter tube 4. When the water volume is too large during the operation period and the horizontal trunk pipe 6 is not drained in time, the position of the tee 7 on each galvanized steel filter tube 4 can be found, and the connection between the tee 7 and the horizontal branch pipe 5 can be disconnected to allow free water to flow into the water collection well 3, and then drained into the above-ground municipal rainwater well through the automatic pumping system in the water collection well 3.
[0017] Based on the above embodiment, in a preferred embodiment, in step 1, the thickness of the steel plate water stop ring 8 is 4 mm. Each galvanized steel filter tube 4 is responsible for approximately 8×8=64m 2 catchment.
[0018] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.
Claims
1. A permanent and temporary combined active drainage and anti-floating construction method based on BIM technology, characterized in that: The steps are: Step 1: a galvanized steel filter pipe (4) is arranged under each column pier (2), the galvanized steel filter pipe (4) comprising an upper section (41) buried in the foundation bottom plate (1), a lower section (42) buried in the concrete cushion layer, and a bottom water filter section (43), the pipe body of the water filter section (43) is provided with a plurality of water inlet grille openings, the outside of the water filter section (43) is wrapped with a filter screen, a steel plate water stop ring (8) is welded on the outer wall of the galvanized steel filter pipe (4), the steel plate water stop ring (8) is located between the upper section (41) and the lower section (42), the galvanized steel filter pipe (4) below the steel plate water stop ring (8) extends into the corresponding water collection pit, and groundwater is collected through the galvanized steel filter pipe (4), a crushed stone layer with a particle size of 10 to 30 mm is filled around the galvanized steel filter pipe (4) as an anti-filtration layer, and then a concrete cushion layer is poured, wherein a smooth transition is formed between the pipe root and the plane where the cushion layer is located; Step 2: construct a reinforced waterproof layer on the completed concrete cushion along the circumference of the galvanized steel filter tube (4), the material of which is the same as the overall waterproof layer; first apply a layer of waterproof coating, then lay the waterproof layer, and then construct the overall waterproof layer, the height of the waterproof layer covering the galvanized steel filter tube (4) is 150 mm; pour a concrete protective layer on the waterproof layer; Step 3: During the concrete cushion and waterproofing construction, a self-priming pump is used to insert the pipe head into the galvanized steel filter pipe (4) to continuously pump water, and timely pump out the seepage water in the foundation soil to ensure that the groundwater level is below the foundation cushion and the concrete cushion construction is dry; Step 4: After the construction of the foundation bottom plate (1) is completed, the top of the galvanized steel filter tube (4) is 50 to 80 mm higher than the foundation top plate, a sealing plate (44) is welded to the top of the galvanized steel filter tube (4), and a galvanized steel pipe with a plug is welded to the side of the galvanized steel filter tube (4); observe the remaining water flow of the drainage pipe and whether the groundwater can be connected, and if not, clean it up in time; Step 5: Arrange a PPR horizontal drainage pipe in the ground layer above the foundation slab. The PPR horizontal drainage pipe includes a horizontal branch pipe (5) and a horizontal main pipe (6). The galvanized steel pipe welded on the side wall of the galvanized steel filter pipe (4) is used as a tee pipe (7). Each galvanized steel pipe is connected to a horizontal branch pipe (5). All horizontal branch pipes (5) are connected to the horizontal main pipe (6). The accumulated water in the galvanized steel filter pipe (4) is led to the nearest water collection well (3) in the area through the PPR horizontal drainage pipe, and then discharged to the above-ground municipal rainwater well through the automatic pumping system in the water collection well (3); Step 6: Use BIM technology to record the position of the tee (7) on the galvanized steel filter tube (4). When the water volume is too large during the operation period and the horizontal main pipe (6) is not drained in time, the position of the tee (7) on each galvanized steel filter tube (4) can be found, and the connection between the tee (7) and the horizontal branch pipe (5) can be disconnected to allow free drainage into the water collection well (3), and then discharged into the above-ground municipal rainwater well through the automatic pumping system in the water collection well (3).
2. According to the BIM technology-based permanent and temporary combined active drainage and anti-floating construction method of claim 1, it is characterized in that: In step 1, the thickness of the steel plate water stop ring (8) is 4 mm.