A construction method for preventing underground water seepage by backfilling the foundation first on the slope

Abstract

The invention discloses a construction method for preventing underground water seepage in a slope backfill foundation, comprising: arranging vertical grooves, horizontal grooves and a sump inside the backfill body; arranging a self-priming water pump to pump out the water in the vertical grooves, horizontal grooves and the sump; using a cover plate to cover the vertical grooves, horizontal grooves and the sump on the backfill body; arranging a glue injection pipe inside the backfill body; fixing the anti-adhesive waterproofing membrane inside the backfill body after the glue injection pipe is buried; constructing the foundation; after the concrete strength of the foundation reaches the requirement, the accumulated water is pumped out once and then a grouting pipe is arranged in the vertical groove and the sump, and grouting the vertical groove, the horizontal groove and the sump is performed through the grouting pipe; after the slurry strength reaches the requirement, the waterproof sealing glue injection material is pressure-injected through the glue injection pipe to seal the leakage. The method can effectively prevent groundwater from infiltrating into the foundation structure and improve the structural safety of the foundation.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a construction method for preventing underground water seepage by first backfilling a foundation with a slope. Background Art

[0002] The foundation engineering plays an important role in the entire construction, carrying the weight of the entire building and transferring it to the underground, which is of great significance. Since the foundation structure is located underground, there is a lot of groundwater or soil moisture. Once the underground seepage water penetrates into the structure, it will affect the performance of concrete and steel bars, thereby affecting the structural safety and shortening the service life of the project.

[0003] It is very necessary to take measures to prevent underground water seepage during foundation construction. The traditional construction method is to set up a waterproof layer around the underground structure. However, for some parts that need to backfill the foundation with concrete in advance before constructing the foundation structure, it is difficult to set up a waterproof layer. After backfilling in advance, there are no conditions for setting drainage ditches around the foundation pit. There is a risk of blocking underground water seepage only by an external waterproof layer.

[0004] In some construction industries, due to special process requirements, the foundation perimeter is backfilled with concrete in advance, and then waterproofing membranes are constructed inside the backfill concrete, and then the foundation structure concrete inside the waterproofing membranes is poured. This construction process results in no drainage measures around the foundation pit, and the existence of underground water seepage will affect the construction quality of the waterproofing membranes, which may lead to loose adhesion of the waterproofing membranes, causing groundwater to seep into the foundation pit structure, further affecting the quality of the foundation pit construction. Therefore, it is necessary to prevent water seepage from the foundation pit structure when the slope is backfilled first. Summary of the invention

[0005] The purpose of the present invention is to provide a construction method for preventing underground water seepage by backfilling the foundation in the slope first, in order to solve the above problems. The method can effectively prevent groundwater from seeping into the foundation structure and improve the structural safety of the foundation.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention provides a construction method for preventing underground water seepage by backfilling a foundation on a slope first, comprising:

[0008] A vertical groove, a horizontal groove and a water collection pit are arranged inside the first backfill body, wherein the vertical grooves are arranged at intervals, the water collection pit is located at the bottom of the vertical grooves, and the horizontal grooves connect adjacent water collection pits;

[0009] A self-priming pump is installed outside the backfill body to pump out the water in the vertical grooves, horizontal grooves and sump;

[0010] Use cover plates to cover the vertical grooves, horizontal grooves and sump on the first backfill body;

[0011] A glue injection pipe is arranged inside the first backfill body;

[0012] After the injection hose is buried, fix the reverse-adhesive waterproof membrane inside the backfill body;

[0013] Construction foundation;

[0014] When the concrete strength of the foundation reaches the required level, the accumulated water is drained once and then grouting pipes are installed in the vertical grooves and water collection pits. Grouting of grouting materials is carried out through the grouting pipes into the vertical grooves, horizontal grooves and water collection pits.

[0015] When the slurry strength reaches the requirement, the water leakage is sealed by pressure-injected waterproof sealing injection materials through the injection pipe.

[0016] In some embodiments, a plurality of vertical grooves are arranged on the preliminary backfill body at intervals of 10-15 m.

[0017] In some embodiments, the horizontal grooves between adjacent sump pits are provided with a 2% slope from the middle point to both ends.

[0018] In some embodiments, the cover plate is fixed to the first backfill concrete by expansion bolts, and the covering position of the cover plate is no less than 50 mm wider than each side of the vertical groove, the horizontal groove and the sump.

[0019] In some embodiments, the glue injection tube is U-shaped, the horizontal length of each section of the glue injection tube is not more than 5000 mm, and adjacent sections are cross-lapped, with the lap length being not less than 300 mm.

[0020] In some embodiments, the top elevation of the injection pipe needs to be at least 500 mm higher than the top surface of the foundation.

[0021] In some embodiments, a slit is left on the glue injection tube at regular intervals, and the slit can open under the glue injection pressure to allow the glue to overflow.

[0022] In some embodiments, the injection hose is fixed to the backfill concrete using a P-type clip, and a matching sealing plug is installed in advance at the end of the injection hose.

[0023] In some embodiments, the top of the grouting pipe is at least 5 m above the foundation surface so as to utilize the height difference pressure to grout the grouting material.

[0024] In some embodiments, during the glue injection operation, the polyurethane glue injection material is pressure-injected through a glue injection tube.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] The present invention is useful for some construction industries where, due to special process requirements, the periphery of the foundation needs to be backfilled in advance, and then the waterproof membrane is constructed, and then the structural concrete inside the waterproof membrane is poured. The above method is used for anti-seepage construction, which can effectively prevent groundwater from seeping into the foundation structure and improve the structural safety of the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 It is a flow chart of the construction method for preventing underground water seepage by backfilling the foundation of the slope in the present invention;

[0029] Figure 2 It is a schematic diagram of the arrangement of the first backfill body groove and the sump in the present invention;

[0030] Figure 3 It is a front view schematic diagram of the arrangement of the first backfill body groove and the sump in the present invention;

[0031] Figure 4 It is a side view schematic diagram of the anti-seepage construction in the present invention;

[0032] Figure 5 for Figure 4 A local enlarged schematic diagram in FIG.

[0033] Figure 6 This is a front view schematic diagram of the pre-buried injection hose in the present invention;

[0034] Figure 7 It is a top view schematic diagram of the pre-buried rubber hose in the present invention.

[0035] Marks and corresponding parts names in the attached drawings:

[0036] 1- backfill first, 2- vertical groove, 3- sump, 4- horizontal groove, 5- foundation cushion, 6- cover plate, 7- waterproof membrane, 8- injection hose, 9- foundation. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] Please refer to Figures 1 to 7 , a slope backfill foundation anti-underground water seepage construction method provided in an embodiment of the present application specifically includes the following contents:

[0047] (1) A vertical groove 2, a horizontal groove 4 and a sump 3 are arranged inside the first backfill body 1, wherein the vertical grooves 2 are arranged at intervals, the sump 3 is located at the bottom of the vertical grooves 2, and the horizontal grooves 4 connect adjacent sumps 3;

[0048] (2) a self-priming water pump is arranged outside the first backfill body 1 to pump out the water in the vertical groove 2, the horizontal groove 4 and the sump 3;

[0049] (3) Using a cover plate 6 to cover the vertical groove 2, the horizontal groove 4 and the sump 3 on the first backfill body 1;

[0050] (4) a glue injection tube 8 is arranged inside the first backfill body 1;

[0051] (5) After the injection pipe 8 is buried, the reverse adhesive waterproofing membrane 7 is fixed to the inner side of the first backfill body 1;

[0052] (6) Construction foundation 9;

[0053] (7) When the concrete strength of the foundation 9 reaches the required level, the accumulated water is drained once and then a grouting pipe is installed in the vertical groove 2 and the sump 3, and grouting of the vertical groove 2, the horizontal groove 4 and the sump 3 is performed through the grouting pipe;

[0054] (8) When the slurry strength reaches the required level, the waterproof sealing injection material is pressure-injected through the injection pipe 8 to seal the leaking water.

[0055] According to some embodiments of the present application, a strip-shaped vertical groove 2 is cut from bottom to top on the concrete of the first backfill body 1, and the groove chiseling height is not lower than the top elevation of the bottom plate guide wall, and the size is not less than 50mm (width) * 50mm (depth) to meet the subsequent installation requirements of the pumping pipe and the grouting pipe of the grouting material. Multiple vertical grooves 2 are arranged on the first backfill body 1 at intervals of 10-15m, and can also be set in the lowest point area of ​​the foundation. A square sump 3 is chiseled at the bottom of each vertical groove 2, and the depth of the sump 3 must be lower than the position of the foundation coil to ensure the lowest water level. A self-priming water pump is set outside the first backfill body 1, and the accumulated water is sucked out through the vertical groove using a water pipe.

[0056] According to some embodiments of the present application, horizontal grooves 4 are chiseled between the bottoms of each vertical groove 2 to connect adjacent sump pits 3, and the horizontal grooves 4 between adjacent sump pits 3 are set with a slope of about 2% from the midpoint to both ends, so as to ensure that all seepage water flows into the sump at the bottom of the groove.

[0057] According to some embodiments of the present application, a cover plate 6 made of Q235B steel plate is used on the first backfill body 1 to cover the chiseled sump 3 and the vertical groove 2 and the horizontal groove 4. The cover plate 6 is fixed to the concrete of the first backfill body 1 with expansion bolts. After the fixing is completed, the protruding part of the bolt is polished flat to prevent the waterproof membrane from being damaged by the bolts. The covering position of the cover plate 6 is not less than 50mm wider than each side of the vertical groove 2, the horizontal groove 4 and the sump 3. This measure is to prevent the waterproof membrane from being squeezed and deformed during the construction of the foundation structure, and then sinking into the vertical groove, the horizontal groove and the sump, affecting the construction quality of the membrane.

[0058] When using expansion bolts to fix the cover plate 6, the part of the expansion bolt protruding from the cover plate 6 is cut off and then the expansion bolt is fixed to the cover plate 6 by welding, and the protruding part is polished and smooth. Before covering, the pumping pipe needs to be placed in the vertical groove 2 and the sump 3. The thickness of the cover plate 6 is 5mm. Before installing the cover plate 6, the 90° corners close to the waterproof membrane 7 need to be cut off to avoid the 90° corners on the cover plate 6 from damaging the waterproof membrane 7 installed later. The cover plate 6 is subsequently poured into the concrete of the foundation 9. After the foundation 9 is poured, the sump and the groove are treated by pouring grouting material. The pouring of the grouting material is carried out before the glue injection work.

[0059] According to some embodiments of the present application, a glue injection pipe 8 is installed at the junction of the foundation cushion layer 5 and the concrete of the first backfill body 1. The glue injection pipe 8 is U-shaped, and the horizontal length of each section of the glue injection pipe 8 is not more than 5000mm. Adjacent sections are cross-lapped, and the lap length is not less than 300mm. The top elevation of the glue injection pipe 8 needs to be higher than the top surface of the foundation 9 by at least 500mm, and the end of the glue injection pipe 8 is temporarily blocked.

[0060] According to some embodiments of the present application, a slit is opened on the glue injection tube 8 at intervals, and the slit will open under the glue injection pressure, so that the glue can overflow and fill the joint between the waterproof membrane 7 and the first backfill body 1 that has not been densely filled by grouting. The glue injection tube 8 will not collapse and deform due to the weight of the concrete and can withstand external concrete pressure. The glue injection tube 8 is fixed to the concrete of the first backfill body 1 with a P-type clip, and a matching plug is installed in advance at the end of the glue injection tube 8.

[0061] The injection hose 8 is made of plastic, is blue and round, has an outer diameter of about 11 mm, and an inner diameter of about 5 mm. A small slit is left on the injection hose 8 every 12-14 mm to allow the injection liquid to overflow into the joint. The slit will open under the pressure of the injection, allowing the glue to overflow the hose and fill the joint. The injection hose 8 will not collapse or deform due to the weight of the concrete, and can withstand 20m concrete pressure.

[0062] After the injection hose 8 is buried, the waterproofing membrane 7 is constructed, and the reverse-adhesive waterproofing membrane 7 is fixed on the first backfill body 1. After the foundation 9 is poured with concrete, the waterproofing membrane 7 and the injection hose 8 are tightly attached by the concrete pressure.

[0063] After the concrete pouring of the foundation 9 is completed and the strength reaches 100%, the accumulated water is drained once by using a self-priming pump and the grouting pipe is buried in the bottom of the vertical groove 2 and the sump 3. The top of the grouting pipe is about 5m above the top surface of the foundation 9. The grouting material is injected by using the height difference pressure to seal the vertical groove 2, the horizontal groove 4 and the sump 3. The grouting pipe is a plastic hose with a diameter of 32mm and an inner wire ring. To facilitate grouting, a feeding funnel is set at the top of the grouting pipe.

[0064] According to some embodiments of the present application, during the glue injection operation, the polyurethane glue injection material is pressure-injected through the glue injection tube 8. Specifically, after the strength of the grouting slurry reaches the requirement, the water leakage is blocked by pressure-injected waterproof sealing glue injection material. The glue reacts when it meets water, expands rapidly and solidifies rapidly into a high-strength and high-elasticity closed-cell polyurethane foam. After solidification, it is basically not affected by the corrosive environment to ensure a good anti-seepage effect. The glue injection construction is carried out by a high-pressure glue injection machine. Under the action of pressure, the glue flows out through the cuts on the glue injection tube 8 and then blocks the gaps everywhere.

[0065] Before formal glue injection, first inject compressed gas into one end of the pre-buried glue injection tube 8, and there is airflow from the other end of the glue injection tube 8 to ensure that the glue injection tube is unobstructed. When the glue injection tube 8 is unobstructed and the glue liquid flows out from the other end of the glue injection tube 8, the other end of the glue injection tube 8 is blocked to carry out glue injection. Ventilate one end of the glue injection tube 8. When the airflow cannot flow out from the other end of the glue injection tube 8, ventilate from the other end of the glue injection tube 8. If there is no airflow at both ends, it indicates that the glue injection tube 8 is blocked. At this time, glue is injected at both ends of the glue injection tube 8 to ensure that the glue injection work is completed.

[0066] After confirming that the glue injection pipe is unobstructed, start injecting glue. Pour part of the mixed glue into the material box and start filling it with pressure. When the glue injection starts, the pressure setting of the glue injection pump starts from the lowest value and slowly increases the pressure as the glue flows. According to the calculated glue dosage, stop pouring when all the glue is poured or when glue returns to the concrete surface during the pouring process.

[0067] Tests have shown that in some construction industries, due to special process requirements, the surrounding area of ​​the foundation needs to be backfilled in advance, and then the waterproof membrane is constructed, and then the structural concrete inside the waterproof membrane is poured. After the construction method in this embodiment is used for anti-seepage construction, this type of slope is backfilled with the foundation first, and there will be no backflow or seepage, which reduces the impact of groundwater on the foundation structure and ensures the structural safety of the foundation.

[0068] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for preventing underground water seepage by backfilling the foundation of the slope first, characterized in that: include: Vertical grooves, horizontal grooves and water collection pits are arranged inside the first backfill concrete, wherein the vertical grooves are arranged at intervals, the water collection pits are located at the bottom of the vertical grooves, and the horizontal grooves connect adjacent water collection pits; A self-priming pump is installed outside the backfill body to pump out the water in the vertical grooves, horizontal grooves and sump; Use cover plates to cover the vertical grooves, horizontal grooves and sump on the first backfill body; A glue injection pipe is arranged inside the first backfill body. The glue injection pipe is U-shaped. The horizontal length of each section of the glue injection pipe is not more than 5000mm. Adjacent sections are cross-lapped, and the lap length is not less than 300mm. A slit is left on the glue injection pipe at intervals. Under the action of the glue injection pressure, the slit can open to allow the glue to overflow. After the injection hose is buried, fix the reverse-adhesive waterproof membrane inside the backfill body; Construction foundation; When the concrete strength of the foundation reaches the required level, the accumulated water is drained once and then grouting pipes are installed in the vertical grooves and water collection pits. Grouting of grouting materials is carried out through the grouting pipes into the vertical grooves, horizontal grooves and water collection pits. When the slurry strength reaches the requirement, the water leakage is sealed by pressure-injected waterproof sealing injection materials through the injection pipe.

2. The method for preventing underground water seepage by backfilling the foundation of the slope first according to claim 1 is characterized in that: A plurality of vertical grooves are arranged on the initial backfill body at intervals of 10-15 m.

3. The method for preventing underground water seepage by backfilling the foundation of the slope first according to claim 1 is characterized in that: The horizontal grooves between adjacent collection pits are set with a slope of 2% from the midpoint to both ends.

4. The method for preventing underground water seepage by backfilling the foundation of the slope first according to claim 1 is characterized in that: The cover plate is fixed to the backfill concrete by expansion bolts, and the covering position of the cover plate is not less than 50mm wider than each side of the vertical groove, horizontal groove and sump.

5. The method for preventing underground water seepage by backfilling the foundation of the slope first according to claim 1 is characterized in that: The top elevation of the injection hose must be at least 500mm higher than the top surface of the foundation.

6. The method for preventing underground water seepage by backfilling the foundation of the slope first according to claim 1 is characterized in that: The injection hose is fixed to the backfill concrete with a P-type clip, and a matching sealing plug is installed in advance at the end of the injection hose.

7. The method for preventing underground water seepage by backfilling the foundation of the slope first according to claim 1 is characterized in that: The top of the grouting pipe should be at least 5m above the foundation surface to utilize the height difference pressure to grout the grouting material.

8. The method for preventing underground water seepage by backfilling the foundation of the slope first according to claim 1 is characterized in that: During the glue injection operation, the polyurethane glue injection material is pressure-injected through the glue injection tube.

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