Grouting leaking stoppage construction method for underground open cut structure

Abstract

The invention discloses a grouting leaking stoppage construction method for an underground open cut structure, which realizes all-directional leaking stoppage and can effectively solve the problem of leakage. The grouting leaking stoppage construction method comprises the following construction processes of construction preparation, wherein equipment is arranged on the ground of a top plate; hole site design and lofting are carried out, and grouting holes are formed in a bottom plate, a side wall, an open cut structure and an entrance and exit of the main body structure; scanning and positioning are conducted, specifically, the hole sites subjected to lofting are scanned, and if the grouting holes are distributed in the steel bars, the positions of the grouting holes are adjusted; drilling and mounting a grouting pipe, drilling a grouting hole and an observation hole, mounting the grouting pipe in the grouting hole, and arranging a ball valve switch; grouting is conducted according to the sequence of the water collecting well, the entrance of the entrance, the bottom plate, the side wall of the bottommost layer and the side wall of the upper layer, and operation is cyclically conducted to the negative layer; secondary grouting is conducted, and if water leakage exists in the reinforced concrete structure, secondary grouting is conducted for blocking; and the structure is repaired, after the cement paste is solidified, the grouting pipe is pulled out, and the grouting holes are filled with the cement paste.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a grouting and plugging construction method for an underground open-cut structure. Background Art

[0002] With the rapid development of urban construction, a number of underground reinforced concrete structure projects have been generated due to the high development and utilization rate of underground space. First, according to the characteristics of underground structures, some parts will produce construction joints, post-casting strips and other combinations of new and old reinforced concrete. Second, according to the characteristics of materials, concrete structures have natural shrinkage, temperature stress changes, insufficient reinforcement in local positions, improper configuration of concrete materials and mix ratios, insufficient maintenance and other reasons that lead to cracks in reinforced concrete structures. Third, due to organizational reasons, irregular concrete vibration forms voids, long unloading time forms cold joints, welding steel bars penetrate waterproof boards, and the steel bar protective layer is too large, which causes water leakage in the structure, thereby affecting the structure's function and life, affecting the appearance quality, and if the leakage is too large, it can cause uneven settlement of surrounding buildings, posing a safety hazard to the later station operation.

[0003] At present, the commonly used plugging method is to carry out local treatment according to the location of structural leakage. One is to groove the surface of concrete cracks and leakage points, bury the grouting needle and then inject epoxy resin to plug the leak; the third is to inject cement-water-glass double liquid slurry after opening a hole in the side wall.

[0004] The main problems of the above commonly used construction methods are: ① low work efficiency, only treating the symptoms but not the root cause; ② poor plugging effect, unable to completely solve the leakage problem, prone to re-leakage in large-area leakage; ③ many uncertain factors and long construction period, requiring targeted local plugging of each leakage point through the surface leakage position, prone to wrong plugging and other situations; ④ high plugging construction cost, epoxy resin and cement water glass double liquid slurry currently have high market unit price, in the case of large project volume, the comprehensive cost is too high; ⑤ the structure itself has great damage, too many grooves and injections on the concrete surface, too many holes in the concrete surface have a great impact on the aesthetic quality of the concrete in the later stage, and the life of chemical materials is short. Summary of the invention

[0005] In order to solve at least one of the above-mentioned technical problems, the present application provides a grouting and plugging construction method for an underground open-cut structure, and the technical solution adopted is as follows.

[0006] The grouting and plugging construction method for underground open-cut structures provided in this application includes the following construction process:

[0007] Construction preparation, arranging equipment on the roof surface;

[0008] Hole location design and layout, arranging grouting holes in the main structure bottom plate, side wall, open cut structure and entrance and exit holes;

[0009] Scanning and positioning: Scan the holes that have been laid out. If the grouting holes are arranged on the steel bars, adjust the positions of the grouting holes.

[0010] Drill holes and install grouting pipes, drill grouting holes and observation holes, install grouting pipes in grouting holes and set ball valve switches;

[0011] Grouting: The grouting order is: water collection well, entrance and exit holes, bottom plate, bottom side wall, next layer side wall, and then repeat the operation to the basement level;

[0012] Secondary grouting: if there is water leakage in the reinforced concrete structure, a second grouting will be carried out to seal it;

[0013] For structural repair, after the cement slurry solidifies, remove the grouting pipe and fill the grouting hole with cement slurry.

[0014] In certain embodiments of the present application, during the hole position design process, staggered grouting holes are arranged in the horizontal direction of the bottom plate of the main structure at a distance of 1 / 3 to 1 / 4 of the span from the side walls on both sides and at a longitudinal spacing of 20 to 30 m, and staggered grouting holes are arranged in the height direction of the side walls at a distance of 1 to 1.5 m from the board surface and at a longitudinal spacing of 20 to 30 m.

[0015] In certain embodiments of the present application, during the hole location design process, grouting holes are arranged in the middle of both end portions of the open-cut structure, and grouting holes are arranged around the entrance and exit hole locations up, down, left, and right.

[0016] In certain embodiments of the present application, when drilling, the holes are arranged in a group of two at a time in the longitudinal direction of the structure, one of which is the initial grouting hole and the other is the grouting hole and also serves as an observation hole.

[0017] In certain embodiments of the present application, an independent observation hole is set during the first grouting, and another grouting hole serves as the observation hole during subsequent grouting.

[0018] In certain embodiments of the present application, during the grouting process, the drainage well is first sealed with waterproof concrete of a higher grade than the original one, and then the entrance and exit holes are sealed by injecting double liquid slurry.

[0019] In certain embodiments of the present application, structural settlement and crack observation points are set before grouting, and if any abnormality is found in the structural detection data during the grouting process, the grouting is stopped.

[0020] In certain embodiments of the present application, the grouting pressure and the drainage and slurry flow of the observation hole are observed during grouting. When the pressure exceeds 1.5 MPa and shows an increasing trend or slurry overflows from the observation hole, the grouting is stopped.

[0021] In certain embodiments of the present application, before the grouting is finished, the pressure is stabilized for a set time and then the grouting is finished, and the valve of the grouting pipe is closed after the grouting is finished.

[0022] In certain embodiments of the present application, during the structural repair process, if the buried grouting pipe cannot be removed, it is cut and then cement slurry is used to fill the gap.

[0023] The present application has at least the following beneficial effects: the grouting plugging construction method of the present application is efficient and economical, and achieves all-round plugging through construction preparation, hole design and layout, scanning positioning, drilling and installation of grouting pipes, grouting, secondary grouting and structural repair and other construction methods. The construction requires fewer people, the construction is safe and reliable, and it can effectively solve the leakage problem.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further illustrated below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0026] Figure 1 The grouting hole distribution map for the entrance and exit openings.

[0027] Figure 2 This is the plan distribution diagram of the grouting holes on the base plate.

[0028] Figure 3 This is the cross-sectional distribution diagram of the grouting holes in the main structure.

[0029] Figure 4 Schematic diagram of grouting.

[0030] Figure 5 This is the grouting flow chart. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like 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 present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the description of the present application, if the reference terms "as an implementation", "an embodiment", "some instances", "some embodiments", "illustrative embodiment", "example", "specific example", "some examples", etc. appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0036] The present application relates to a grouting and plugging construction method for an underground open-cut structure. Figure 5 The construction process of the grouting plugging construction method includes construction preparation, hole design and layout, scanning positioning, drilling and installation of grouting pipes, grouting and structural repair. It should be noted that after grouting, whether to carry out secondary grouting depends on whether there is water leakage.

[0037] Combined with Figure 4 The grouting and plugging construction method of the present application intends to use drilling to penetrate the main structure, so that it stays in front of the waterproof layer behind it, and then conducts all-round grouting to make the cement slurry fill the gap between the main structure and the back. After the cement slurry solidifies, it can fill the gap between the surrounding structure and the main structure, thereby reducing the water volume and head pressure on the back of the structure and solving the problem of water leakage.

[0038] 1. Construction preparation: Arrange equipment on the top floor.

[0039] Grouting machines, cement mixers and other background equipment are arranged in the top plate ground area, and cement positions are divided. The grouting pipe is connected from the top plate ground position to the structure grouting hole, and pressure gauges are installed at the grouting machine position and the grouting hole position below to manage the background slurry discharge pressure and grouting hole filling pressure.

[0040] 2. Hole design and layout: Combined with the attached Figure 1 To Attachment Figure 3 Grouting holes are arranged on the bottom plate of the main structure, side walls, open-cut structures and openings of entrances and exits.

[0041] (1) Grouting holes are arranged in a staggered manner at a distance of 1 / 3 to 1 / 4 of the span of the side walls on both sides in the horizontal direction of the main structure bottom plate and at a longitudinal spacing of 20 to 30 m. Grouting holes are arranged in a staggered manner at a distance of 1 to 1.5 m from the plate surface in the height direction of the side walls and at a longitudinal spacing of 20 to 30 m. The grouting holes are arranged in a staggered manner to ensure uniform slurry flow and distribution, and the operation sequence is from low to high, forming a full-range surrounding hole grouting.

[0042] (2) Grouting holes are arranged in the middle of both ends of the open-cut structure.

[0043] (3) Grouting holes are arranged around the entrance and exit holes. If the distance from edge to edge of the hole is less than 10m, one grouting hole is arranged. If the distance from edge to edge of the hole is greater than 10m, two or more grouting holes are arranged.

[0044] (4) Pre-buried grouting pipes are used for the above openings, construction joints, end side walls, bottom plate corners and other areas prone to water leakage, and subsequent hole-opening layout is used for the rest.

[0045] 3. Scan and locate: Scan the holes that have been laid out. If the grouting holes are arranged on the steel bars, adjust the positions of the grouting holes.

[0046] After the grouting holes are laid out, the holes that have been laid out are scanned using a concrete steel bar detector to determine whether the grouting holes are laid out on the steel bars. If the grouting holes are laid out on the steel bars, the holes are adjusted up and down and left and right so that the integrity of the steel mesh is maintained after the holes are opened in the structure, reducing the damage to the structure caused by the holes.

[0047] 4. Drill holes and install grouting pipes. Drill grouting holes and observation holes. Install grouting pipes in the grouting holes and set ball valve switches.

[0048] (1) Use a water-grinding drill to drill grouting holes and observation holes. The holes should be perpendicular to the structural surface and the drilling depth should reach the outside of the main structure and avoid penetrating the waterproof layer.

[0049] (2) When drilling holes, the holes are arranged in groups of two in the longitudinal direction of the structure, one of which is the initial grouting hole and the other is the grouting hole and also serves as an observation hole. It should be noted that all holes cannot be drilled at one time to avoid the problem of insufficient grout filling.

[0050] An independent observation hole is set up during the first grouting, and another grouting hole serves as the observation hole during subsequent grouting.

[0051] (3) The grouting pipe is made of seamless pipe material. The grouting pipe is installed in the hole and a ball valve switch is set. The pipe mouth of the grouting pipe is 100 to 150 mm away from the structural surface. If the structural depth is large, the grouting pipe is buried 500 mm into the main structure. If the structural thickness is small, it is buried outside the main structure.

[0052] (4) After the grouting pipe is buried, use quick cement to seal the gap between the grouting pipe and the drilled hole. Fill it tightly and clear the buried grouting pipe after the cement solidifies until water seeps out.

[0053] (5) After the grouting pipe is installed, open the ball valve to drain and release the pressure to drain the accumulated water in the gap between the waterproof layer and the column structure.

[0054] 5. Grouting. The grouting order is: water collection well, entrance and exit holes, bottom plate, bottom side wall, upper side wall, and repeat the operation to the basement level.

[0055] (1) The materials used are water, 42.5 ordinary Portland cement, and an aqueous solution of sodium silicate.

[0056] (2) Slurry ratio: single-liquid slurry water-cement ratio 0.8 to 1, double-liquid slurry 1: (0.5 to 0.7).

[0057] (3) During the grouting process, the drainage well is first sealed with waterproof concrete of a higher grade than the original one to prevent slurry leakage during grouting of the bottom plate. Then, the entrance and exit holes are sealed by injecting double liquid slurry to prevent slurry leakage from the holes when grouting the structure in all directions.

[0058] (4) Grouting is mainly based on single-liquid slurry, and double-liquid slurry is used in special locations such as entrance and exit holes.

[0059] (5) Before grouting, set up structural settlement and crack observation points. If any abnormality is found in the structural detection data during the grouting process, stop grouting.

[0060] (7) When grouting is started for the first time, an independent observation hole is set up to adjust the grouting pressure. The maximum initial grouting pressure is 1.5 MPa. During the grouting process, the grouting pressure of the bottom plate is controlled to be 0.5 to 1 MPa to prevent the structure from floating. The grouting pressure of the side wall is 1 to 1.5 MPa. Grouting is carried out sequentially in the same direction. The grouting pressure of the final hole is not less than 1.5 MPa, and the grouting diffusion range is observed to finally determine whether the grouting hole arrangement and spacing are in an ideal state.

[0061] (8) During grouting, observe the grouting pressure and the drainage and slurry flow of the observation hole, and strictly control the grouting pressure and other parameters. When the pressure exceeds 1.5MPa and shows a pressure-increasing trend or there is slurry overflowing from the observation hole, stop grouting and judge and analyze whether the conditions for terminating grouting have been met.

[0062] (9) To ensure that the slurry spreads and fills the gaps, the pressure is stabilized for a set time before the grouting is completed, and the valve of the grouting pipe is closed after the grouting is completed to prevent pressure loss. It should be noted that the pressure stabilization time is 3 minutes.

[0063] (10) After grouting is completed, seal the grouting pipe, cut the exposed part of the grouting pipe flat along the side wall, chisel out the solidified slurry in the pipe, and then seal it with cement.

[0064] 6. Secondary grouting: If there is water leakage in the reinforced concrete structure, a second grouting will be carried out to seal it.

[0065] (1) The second grouting should be carried out after the slurry from the first grouting has solidified.

[0066] (2) After the all-round grouting of the reinforced concrete structure is completed, static observation is set for a period of time to observe whether there is still water leakage in the structure.

[0067] (3) For the areas that are not completely blocked, a second injection of single liquid slurry is performed to seal them, and drainage holes are also set on the upper layer and on the left and right sides.

[0068] 7. Structural repair.

[0069] (1) After the cement slurry solidifies, remove the grouting pipe and fill the grouting hole with cement slurry.

[0070] (2) If the buried grouting pipe cannot be removed, it should be cut and then the gap should be filled with cement slurry.

[0071] (3) After the grouting work is completed, apply cement mortar to the concrete surface and adjust the color difference between the plugging area and the surrounding concrete to ensure a neat appearance and consistent color difference.

[0072] It should be noted that the grouting plugging construction method of this application was used in the construction of a certain subway station. The station is a four-story underground open-cut station, connected to the standard section of the shield section station at both ends, with a total length of 229.8m, a foundation pit width of 23.1m, an expanded end width of 32.3m, and a foundation pit depth of 38.252m to 40.167m. A flexible outer waterproof layer (PVC waterproof board and geotextile) is set between the station side wall (thickness 1000mm, 1200mm, 1300mm) and the surrounding structure, and a bottom plate waterproof layer (thickness 1300mm, PVC waterproof board and geotextile) adopts a composite structure.

[0073] This application adopts an underground open-cut structure system grouting and plugging construction method to achieve all-round systematic grouting treatment of structural water leakage caused by high underground water level, long side wall clearance, large base plate volume, long station length, material defects, and improper operation of construction personnel due to the deep foundation pit based on the riverbed. The structural water leakage is plugged quickly and efficiently, which can reduce construction quality problems and construction costs caused by defect treatment.

[0074] The construction method of the present application is suitable for treating water leakage of varying degrees in underground open-cut structures after the construction is completed. The system grouting method solves the problem of water leakage of varying degrees currently common in underground open-cut structures.

[0075] The construction method of the present application is simple to operate. Through construction preparation, hole design and layout, scanning positioning, drilling and installation of grouting pipes, grouting, secondary grouting, structural repair fees and other construction methods, it can effectively and comprehensively plug leaks, and requires fewer people to construct. The working surface is only 1 to 1.5 meters above the ground, making the construction safe and reliable, and reducing the construction difficulties of setting up scaffolding due to the need to inject epoxy resin to specific crack locations. The grouting slurry is mainly configured with cement single-liquid slurry, reducing the configuration of double-liquid slurry of cement slurry combined with water glass, which provides better efficacy and saves a lot of construction time.

[0076] The construction method of the present application achieves an ideal leak plugging effect, and while ensuring safe operation, it saves a lot of material costs, machinery and equipment costs, labor costs and construction period costs for the project.

[0077] The above is a detailed description of the implementation methods of the present application in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A grouting and plugging construction method for an underground open-cut structure, characterized in that: include Construction preparation, arranging equipment on the roof surface; Hole location design and layout, arranging grouting holes in the main structure bottom plate, side wall, open cut structure and entrance and exit holes; Scanning and positioning: Scan the holes that have been laid out. If the grouting holes are arranged on the steel bars, adjust the positions of the grouting holes. Drill holes and install grouting pipes, drill grouting holes and observation holes, install grouting pipes in grouting holes and set ball valve switches; Grouting: The grouting order is: water collection well, entrance and exit holes, bottom plate, bottom side wall, next layer side wall, and then repeat the operation to the basement level; Secondary grouting: if there is water leakage in the reinforced concrete structure, a second grouting will be carried out to seal it; For structural repair, after the cement slurry solidifies, remove the grouting pipe and fill the grouting hole with cement slurry.

2. The grouting and plugging construction method for underground open-cut structure according to claim 1 is characterized by: During the hole position design process, staggered grouting holes are arranged in the horizontal direction of the main structure bottom plate at 1 / 3 to 1 / 4 of the span away from the side walls on both sides and at a longitudinal spacing of 20 to 30m. Staggered grouting holes are also arranged in the height direction of the side walls at a distance of 1 to 1.5m from the plate surface and at a longitudinal spacing of 20 to 30m.

3. The grouting and plugging construction method for underground open-cut structure according to claim 1 is characterized in that: During the hole position design process, grouting holes are arranged in the middle of the two ends of the open-cut structure, and grouting holes are arranged up, down, left and right around the entrance and exit holes.

4. The grouting and plugging construction method for underground open-cut structure according to claim 1 is characterized in that: When drilling, holes are arranged in groups of two in the longitudinal direction of the structure, one of which is the initial grouting hole and the other is the grouting hole and also serves as an observation hole.

5. The grouting and plugging construction method for underground open-cut structure according to claim 4 is characterized in that: An independent observation hole is set up during the first grouting, and another grouting hole serves as the observation hole during subsequent grouting.

6. The grouting and plugging construction method for underground open-cut structure according to claim 1 is characterized by: During the grouting process, the drainage well is first sealed with waterproof concrete of a grade higher than the original one, and then the entrance and exit holes are sealed by injecting double liquid slurry.

7. The grouting and plugging construction method for underground open-cut structure according to claim 6, characterized in that: Structural settlement and crack observation points are set up before grouting. If any abnormality is found in the structural detection data during the grouting process, the grouting is stopped.

8. The grouting and plugging construction method for underground open-cut structure according to claim 4 or 5, characterized in that: During grouting, observe the grouting pressure and the drainage and slurry flow of the observation hole. When the pressure exceeds 1.5MPa and shows an increasing trend or slurry overflows from the observation hole, stop grouting.

9. The grouting and plugging construction method for underground open-cut structure according to claim 1, characterized in that: Before the grouting is finished, continue to stabilize the pressure for the set time and then end the grouting, and close the valve of the grouting pipe after completion.

10. The grouting and plugging construction method for underground open-cut structure according to claim 1, characterized in that: During the structural repair process, if the buried grouting pipe cannot be removed, it will be cut and then cement slurry will be used to fill the gap.

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