Capillary pipeline type underground structure drainage system and construction method thereof

Abstract

The invention relates to a capillary tube type underground structure drainage system and a construction method thereof.The system comprises an underground structure bottom plate and an underground structure side wall, a transverse structure construction joint and a transverse structure deformation joint are arranged on the underground structure bottom plate and transversely extend to the underground structure side wall, and a water collecting pit is further formed in the underground structure bottom plate; transversely-arranged capillary drainage pipelines are arranged on the two longitudinal sides of the structural construction joint and the structural deformation joint and communicate with the longitudinally-arranged capillary drainage pipelines, and the longitudinally-arranged capillary drainage pipelines penetrate through the structural construction joint and the structural deformation joint and are connected into the water collecting pit. On the basis of the concept of external prevention and internal drainage, the waterproof and drainage measures of the underground structure are perfected, on the basis that the exterior of an original underground structure is completely wrapped with water, crisscrossed capillary drainage pipelines are arranged in the structure, joint leakage water, underground structure surface leakage water and the like can be effectively guided and drained to a water collection pit, safe use of the underground structure is ensured, and the construction cost is reduced. And the long-term durability of underground engineering is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering construction, and in particular to a capillary pipe type underground structure drainage system and a construction method thereof. Background Art

[0002] With the increasing depth of underground projects and the increasing demand for the utilization of deep underground space, the construction environment of underground projects has become increasingly complex. For example, the existence of deep underground pressurized water not only affects the smooth construction of underground projects, but also affects the leakage of underground structures to a certain extent, reducing the long-term durability of underground projects.

[0003] At present, water leakage in underground structures has become one of the main problems of underground projects. The cost of sealing leakage in various underground projects accounts for a considerable proportion of the entire operation and maintenance cost of underground projects. At the same time, long-term water leakage will not only increase the safety risks during the operation of underground projects, such as water leakage in various urban rail transit underground stations, which often causes passengers to slip and fall, but also sharply reduce the stress stability and long-term durability of underground structures, and reduce structural reliability and service life.

[0004] The existing urban underground structure drainage system mainly focuses on structural self-waterproofing, joint waterproofing, and multi-layer defense and rigid-flexible cooperation as the main principles. Various structural joints, especially structural deformation joints, are generally equipped with external waterproof panels, and skin-type full-cover waterproofing, such as waterproof membranes, are set on the outside of the main structure. The focus of the waterproofing concept of this type of underground structure is "prevention", that is, to completely block groundwater from the structure. However, as the operating time increases, the joint waterproofing material ages, the joints deform and open, and the groundwater will leak into the structure through the joints. At the same time, the leaking water on the side wall surface will also flow to the surface of the underground structure.

[0005] Therefore, how to increase the drainage function of underground structures on the basis of existing groundwater treatment dominated by "prevention" and propose a new underground structure drainage technology of "external prevention and internal drainage" is a major technical problem that has attracted widespread attention in the industry. Summary of the invention

[0006] The purpose of the present invention is to provide a capillary pipe type underground structure drainage system and a construction method thereof, so as to solve the shortcomings of existing groundwater treatment measures that are mainly based on "prevention".

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] Provided is a capillary pipe type underground structure drainage system, the system comprising an underground structure bottom plate and an underground structure side wall, the underground structure bottom plate is provided with a structural construction joint and a structural deformation joint arranged transversely along the underground structure, the structural construction joint and the structural deformation joint extend transversely to the underground structure side wall, and a sump is also provided in the underground structure bottom plate;

[0009] Capillary drainage pipes arranged laterally along the underground structure are provided on both sides of the structural construction joint and the structural deformation joint. The capillary drainage pipes on both sides of the structural construction joint and the capillary drainage pipes on both sides of the structural deformation joint are connected with the capillary drainage pipes arranged longitudinally along the underground structure. The capillary drainage pipes arranged longitudinally pass through the structural construction joint and the structural deformation joint and are connected to the sump.

[0010] Furthermore, the capillary drainage pipe is located in a wedge-shaped groove provided on the surface of the bottom plate of the underground structure.

[0011] Furthermore, an embedded wedge-shaped channel steel is provided in the wedge-shaped groove, and the capillary drainage pipe is located in the embedded wedge-shaped channel steel;

[0012] The lower part of the embedded wedge-shaped channel steel is paved with fine sand, the upper part is paved with coarse sand, and the capillary drainage pipe is buried therein.

[0013] Furthermore, the capillary drainage pipeline comprises a water-permeable steel pipe, and a water-permeable hole is arranged on the upper part of the pipe wall of the water-permeable steel pipe.

[0014] Furthermore, the permeable steel pipe is arranged in sections at intervals in the capillary drainage pipe, and the spaces between adjacent sections are filled with fine sand and coarse sand.

[0015] Furthermore, the permeable steel pipe directly passes through the structural construction joint;

[0016] The permeable steel pipe is disconnected at the structural deformation joint and is divided into two front and rear sections.

[0017] Furthermore, both ends of the segment of the water-permeable steel pipe are provided with a water-permeable film for wrapping;

[0018] A steel casing is arranged outside the water-permeable steel pipe, one end of the steel casing is closed by a steel mesh and the other end is open;

[0019] The water-permeable steel pipe, the end of which is closed by the water-permeable film, is inserted into the open end of the steel casing.

[0020] Furthermore, the capillary drainage pipe arranged longitudinally is connected with the capillary drainage pipe arranged transversely through a four-way steel pipe.

[0021] Furthermore, the four ends of the four-way steel pipe are all provided with a water-permeable film for wrapping;

[0022] Steel casings are arranged outside the four ends of the four-way steel pipe, and the four ends of the four-way steel pipe are inserted into the steel casings. The other end of the steel casing is closed by a steel mesh.

[0023] On the other hand, a construction method of the capillary pipe underground structure drainage system as described above is provided, the method comprising:

[0024] Cutting the steel pipe and opening water-permeable holes on the upper half of the pipe wall to obtain a water-permeable steel pipe segment;

[0025] Make four-way steel pipe;

[0026] A steel casing is made and one end of the steel casing is sealed with a steel mesh, and water-permeable membranes are fixed at both ends of the water-permeable steel pipe segment and the four ends of the four-way steel pipe, and are all inserted into the open end of one steel casing;

[0027] Make a wedge-shaped channel steel with both sides serrated;

[0028] A parallel wedge-shaped groove is reserved in advance on both sides of the longitudinal direction of the structural construction joint and the structural deformation joint, and the wedge-shaped grooves distributed along the longitudinal direction of the underground structure are correspondingly reserved to communicate with the transverse wedge-shaped grooves, and at the same time, a water collection pit is reserved;

[0029] A wedge-shaped channel steel is pressed into the wedge-shaped groove, and fine sand is filled into the lower half of the wedge-shaped channel steel. The permeable steel pipe segment and the four-way steel pipe are placed on the fine sand, and the coarse sand is covered to fill the wedge-shaped channel steel. At the same time, the adjacent permeable steel pipe segments are filled with fine sand and coarse sand.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a capillary-type underground structure drainage system and a construction method thereof. Based on the concept of "external defense and internal drainage", the underground structure drainage measures are improved, and based on the principle of taking advantage of the situation, on the basis of the full waterproofing of the exterior of the existing underground structure, criss-crossing capillary drainage pipes are arranged inside the structure. The capillary drainage pipes are arranged in parallel on both sides of the joints, and are directly connected to the sump through the capillary pipes perpendicular to the joints. Therefore, water leaking from the joints and water leaking on the surface of the underground structure can be effectively drained to the sump, thereby ensuring the safe use of the underground structure and improving the long-term durability of the underground project. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0033] Figure 1 Elevation layout of capillary drainage pipes set up for the basement of underground structures.

[0034] Figure 2 This is the plan layout of the capillary drainage pipes above the base plate of the underground structure.

[0035] Figure 3 A cross-sectional view of the capillary drainage pipe above the basement floor.

[0036] Figure 4 Schematic diagram of the setting of the four-way pipe at the intersection of capillary drainage pipes.

[0037] Figure 5 for Figure 4 Section 1-1 in the figure.

[0038] Figure 6 This is a large-scale drawing of the capillary drainage pipe.

[0039] Figure 7 Schematic diagram of the connection between the capillary drainage pipe and the end steel casing.

[0040] Figure 8 This is the large-scale drawing of embedded wedge-shaped channel steel.

[0041] The symbols in the figure are:

[0042] 1-underground structure base plate, 2-underground structure side wall, 3-structural construction joint, 4-structural deformation joint, 5-decoration layer, 6-sump, 7-capillary drainage pipe, 8-embedded wedge-shaped channel steel, 9-fine sand, 10-coarse sand, 11-permeable steel pipe, 12-four-way steel pipe, 13-permeable film, 14-steel casing, 15-steel wire mesh, 16-permeable hole. DETAILED DESCRIPTION

[0043] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0044] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", "longitudinal", "lateral", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", etc. should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integral connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and this should not be construed as a limitation on the order of the steps.

[0047] In a specific implementation, Figure 1 The direction from left to right in the figure is defined as the horizontal direction of the underground structure, and the direction perpendicular to the horizontal direction is defined as the longitudinal direction of the underground structure.

[0048] like Figure 1 The underground space structure is mainly composed of an underground structure bottom plate 1 and an underground structure side wall 2, etc. A decoration layer 5 of a certain thickness is also arranged above the underground structure bottom plate 1. Due to the need for rapid construction and quality assurance of the underground space structure, structural construction joints 3 and structural deformation joints 4 are arranged at regular intervals inside the underground structure bottom plate 1. In order to ensure that the leakage water can be collected and discharged as soon as possible during the use of the underground structure, the present invention provides a new type of capillary pipe underground structure drainage system, which can ensure that the leakage water in the joints of the underground space structure can be timely and effectively guided and treated, with external prevention and internal drainage, thereby improving the safety and long-term durability of the underground space structure.

[0049] The system includes an underground structure bottom plate 1 and an underground structure side wall 2. The underground structure bottom plate 1 is provided with a structural construction joint 3 and a structural deformation joint 4 arranged transversely along the underground structure. The structural construction joint 3 and the structural deformation joint 4 both extend transversely to the underground structure side wall 2. A sump 6 is also provided in the underground structure bottom plate 1.

[0050] Capillary drainage pipes 7 arranged horizontally along the underground structure are provided on both sides of the structural construction joint 3 and the structural deformation joint 4. The capillary drainage pipes 7 on both sides of the structural construction joint 3 and the capillary drainage pipes 7 on both sides of the structural deformation joint 4 are connected to the capillary drainage pipes 7 arranged longitudinally along the underground structure. The longitudinally arranged capillary drainage pipes 7 pass through the structural construction joint 3 and the structural deformation joint 4 and are connected to the sump 6.

[0051] The capillary drainage pipe 7 is located in a wedge-shaped groove provided on the surface of the underground structure bottom plate 1, and an embedded wedge-shaped channel steel 8 is provided in the wedge-shaped groove. The capillary drainage pipe 7 is located in the embedded wedge-shaped channel steel 8. Fine sand 9 is laid on the lower part of the embedded wedge-shaped channel steel 8, and coarse sand 10 is laid on the upper part, and the capillary drainage pipe 7 is buried therein.

[0052] The two sides of the wedge-shaped channel steel 8 are serrated, corresponding to the shape of the wedge-shaped groove reserved in the underground structure bottom plate 1, and the wedge-shaped channel steel 8 is effectively connected to the underground structure bottom plate 1 by pressing. The number of steps on the side of the wedge-shaped channel steel 8 is ≥3, and the angle between it and the horizontal plane is ≤85°.

[0053] The capillary drainage pipe 7 includes a permeable steel pipe 11, and the upper half of the permeable steel pipe 11 is provided with permeable holes 16, which are arranged in a plum blossom shape, and the hole diameter is smaller than the average particle diameter of coarse sand or gravel, ensuring that only leaking water is allowed to pass freely in the permeable steel pipe 11. The middle part of the permeable steel pipe 11 and the interface between coarse sand 10 and fine sand 9 are basically at the same elevation. The permeable circular holes 16 are only arranged in the coarse sand 10 layer to collect the leaking water above the underground structure bottom plate 1. The longitudinal slope of the capillary drainage pipe 7 can be considered as 0.5%, and reaches the lowest point at the sump 6. The longitudinal slope of the permeable steel pipe 11 inside it can be adjusted accordingly according to the situation, but it should be greater than 0.3%.

[0054] The permeable steel pipe 11 is arranged in sections in the capillary drainage pipe 7, which is discontinuous in the length direction, and the adjacent sections are filled with fine sand 9 and coarse sand 10. For the capillary drainage pipe 7 perpendicular to the structural deformation joint 4, the permeable steel pipe 11 should be set away from the structural deformation joint 4 as much as possible. When it is impossible to avoid it, the structural deformation joint 4 at the corresponding position should be designed to be concave to avoid the position of the capillary drainage pipe 7. That is: the permeable steel pipe 11 directly passes through the structural construction joint 3, and the permeable steel pipe 11 is disconnected at the structural deformation joint 4, and is divided into two sections. The spacing and number of the capillary drainage pipes 7 perpendicular to the structural joints can be flexibly set according to the estimated water leakage of the underground structure bottom plate 1, but the spacing should generally not be greater than 5m.

[0055] The outer side of the end of the permeable steel pipe 11 is wrapped by a steel casing 14, one end of the steel casing 14 is closed by a steel wire mesh 15, and a sand-blocking and water-permeable film 13 is provided at the end of the permeable steel pipe 11, and the end of the water-permeable film 13 of the permeable steel pipe 11 is inserted into the open end of the steel casing 14. The length of the steel casing 14 should be no less than twice the diameter of the permeable steel pipe 11, ensuring that when the steel casing 14 completely covers the permeable steel pipe 11 and the length is no less than 1 times its diameter, there is still a spacing of about 1 times the diameter of the permeable steel pipe 11 between the steel wire mesh 15 and the water-permeable film 13, so as to prevent sand and soil particles from entering the permeable steel pipe 11.

[0056] The longitudinally arranged capillary drainage pipe 7 is connected to the transversely arranged capillary drainage pipe 7 through a four-way steel pipe 12. Similarly, the four ends of the four-way steel pipe 12 are also provided with a water-permeable film 13, and the four ends of the four-way steel pipe 12 are wrapped by a steel casing 14, one end of the steel casing 14 is closed by a steel wire mesh 15, and the end of the water-permeable film 13 of the four-way steel pipe 12 is inserted into the open end of the steel casing 14.

[0057] The top surface of the underground structure bottom plate 1 is flush with the top of the capillary drainage pipe 7, that is, the capillary drainage pipe 7 is embedded in the underground structure. According to the functional requirements, a decoration layer 5 of a certain thickness is laid on the surface of the underground structure bottom plate 1.

[0058] In the above structure, the permeable steel pipe 11, the four-way steel pipe 12, the wedge-shaped channel steel 8, the steel casing 14 and the wire mesh 15 can all be made of Q235 or Q345 steel. The underground structure bottom plate 1 and the underground structure side wall 2 are both conventional reinforced concrete structures. The fine sand 9, coarse sand 10 or gravel placed in the wedge-shaped channel steel 8 are all washed, sieved and have composite particle size requirements. The structural construction joint 3 and the structural deformation joint 4 are all considered as conventional joints.

[0059] The construction method of the capillary pipe underground structure drainage system specifically comprises the following steps:

[0060] S1: Cut the steel pipe and open a water-permeable hole 16 on the upper half of the pipe wall to obtain a water-permeable steel pipe 11 segment.

[0061] According to the size of the capillary drainage pipe 7 and the requirements of the internal drainage process of the underground structure, the steel pipe of a specific diameter is cut according to the length requirement, and a circular permeable hole 16 is opened in the upper section according to the plum blossom type arrangement requirement. The diameter of the circular hole can be considered to be no more than 0.5 cm, and at the same time smaller than the average particle size of the gravel filled later.

[0062] S2: According to the requirements and similar processes, a four-way steel pipe 12 is manufactured.

[0063] S3: Make a steel casing 14, and seal one end of the steel casing 14 with a steel mesh 15, fix the water-permeable membrane 13 at both ends of the water-permeable steel pipe 11 segment and the four ends of the four-way steel pipe 12, and insert them into the open end of a steel casing 14 according to a certain spacing requirement.

[0064] According to the size of the permeable steel pipe 11, the steel casing 14 is manufactured as required. The length of the steel casing 14 is at least twice the diameter of the permeable steel pipe 11. Its inner diameter must match the outer diameter of the permeable steel pipe 11. The steel casing 14 is sealed at one end with a wire mesh 15. The mesh size of the wire mesh 15 must be smaller than the average particle size of the sand and gravel to be filled later. A water-permeable and sand-blocking film 13 is selected as required, and the water-permeable film 13 is placed on the end of the permeable steel pipe 11. Then, the permeable steel pipe 11 with the water-permeable film 13 is inserted into the opening of the steel casing 14. The insertion depth can be considered as one times the diameter of the permeable steel pipe 11. Use the same method to set the steel casing 14 at the four ends of the four-way steel pipe 12.

[0065] S4: Make a wedge-shaped channel steel 8, both sides of which are serrated. Specifically:

[0066] According to the size of the capillary drainage pipe 7 and the average particle size of sand and gravel, a wedge-shaped channel steel 8 with serrated sides, flush bottom and open top is pressed by a thin steel plate of a certain thickness. The number of serrations can be considered to be no less than 3, and the angle between the serrated edge and the horizontal plane can be considered to be about 80°.

[0067] S5: A horizontal wedge-shaped groove is reserved in advance in parallel directions on both sides of the structural construction joint 3 and the structural deformation joint 4, and a corresponding longitudinal wedge-shaped groove is reserved to communicate with the horizontal wedge-shaped groove, and at the same time, a water collection pit 6 is reserved. Specifically:

[0068] According to the size of the capillary drainage pipe 7 and the average particle size of the sand and gravel, a thin steel plate of a certain thickness is used to press a wedge-shaped channel steel 8 with serrated sides, a flush bottom and an open top.

[0069] S5: A transverse wedge-shaped groove is reserved on both sides of the longitudinal direction of the structural construction joint 3 and the structural deformation joint 4, and the longitudinal wedge-shaped groove is connected to the transverse wedge-shaped groove accordingly, and a water collection pit 6 is reserved. Specifically:

[0070] (1) According to the design requirements, based on the specific design schemes of the underground structure bottom plate 1, the underground structure side wall 2, the structure construction joint 3, and the structure deformation joint 4, a capillary drainage pipe 7 is reserved in advance in parallel directions on both sides of the structure construction joint 3 and the structure deformation joint 4. The reserved conditions of the underground structure bottom plate 1 should be reserved according to the size of the wedge-shaped channel steel 8 and the side serrated structure requirements.

[0071] (2) According to the position and size of the sump 6 on the base plate 1 of the underground structure, at least two capillary drainage pipes 7 are reserved in the longitudinal direction of the underground structure and perpendicular to the structural construction joint 3 and the structural deformation joint 4. The specific reserved conditions need to meet the serrated structural requirements of the side of the wedge-shaped channel steel 8.

[0072] (3) According to the design requirements, the foundation pit of the underground project is excavated and the main structure is cast, and a sump 6 is reserved at the corresponding position on the underground structure bottom plate 1 as required.

[0073] S6: Press wedge-shaped channel steel 8 into the wedge-shaped groove, fill the lower part of the wedge-shaped channel steel 8 with fine sand 9, place the permeable steel pipe 11 segment and the four-way steel pipe 12 on the fine sand 9, cover the coarse sand 10 to fill the wedge-shaped channel steel 8, and at the same time, fill the space between adjacent permeable steel pipe 11 segments with fine sand 9 and coarse sand 10. Specifically:

[0074] (1) A wedge-shaped channel steel 8 is pressed into the capillary drainage pipe 7 at a reserved position on the underground structure bottom plate 1, and fine sand 9 is filled into the lower half section of the channel steel. During the filling process, a groove is reserved according to the contour of the permeable steel pipe 11.

[0075] (2) The permeable steel pipe 11 with the permeable film 13 and the steel casing 14 and the four-way steel pipe 12 are placed in the wedge-shaped channel steel 8 and on the fine sand 9 layer, ensuring that the permeable hole 16 is located in the upper half section. The four-way steel pipe 12 is only arranged at the intersection of the horizontal and vertical capillary drainage pipes 7. The longitudinal spacing between adjacent permeable steel pipes 11 along the capillary drainage pipes 7 can be considered to be about 1.5 times their own length. Finally, the coarse sand 10 is filled into the wedge-shaped channel steel 8 to ensure that the surface of the wedge-shaped channel steel 8 is filled with a certain thickness of coarse sand 10, which can minimize the adverse effects of the concentrated pressure on the upper part of the underground structure bottom plate 1 on the pipeline in the later stage.

[0076] Finally, a finishing layer 5 of a certain thickness is applied on the underground structure bottom plate 1 as required, and generally a mortar leveling layer and floor tiles may be considered.

[0077] The capillary drainage pipe 7 arranged on the above-mentioned underground structure bottom plate 1 has the main purpose of collecting leakage water of the underground structure, especially the leakage water at the structure construction joints 3 and the structure deformation joints 4, and "taking advantage of the situation" to discharge the leakage water at the structure joints and the surface of the underground structure into the collection pit 6 through the permeable steel pipe 11 and coarse sand 10 along the capillary drainage pipe 7 with a certain slope, thereby effectively reducing local moisture stains and water accumulation inside the underground structure.

[0078] The structural deformation joint 4 arranged at the position of the underground structure bottom plate 1 should ensure that there are at least two capillary drainage pipes 7 to directly connect the structural deformation joint 4 with the sump 6.

[0079] The depth of the wedge-shaped channel steel 8 is generally not less than 5-6cm, and the depth can be considered to be about 5cm. The number of tooth-shaped steps on its two side surfaces is generally not less than 3; the angle between the two side edges and the bottom edge can generally be considered to be about 80°. The wedge-shaped cross-section structure is conducive to its effective "bite" with the bottom plate, ensuring long-term stability during use.

[0080] The permeable holes 16 on the upper half of the permeable steel pipe 11 and the wire mesh 15 and the permeable film 13 at the end should all have the size or aperture requirements to prevent sand from flowing in. Generally, the aperture of the permeable circular hole 16 can be considered as 5mm (equivalent to the particle size of coarse sand 10), and the aperture of the wire mesh 15 can be considered as 2-3mm.

[0081] The longitudinal slope of the capillary drainage pipe 7 and the permeable steel pipe 11 can be considered to be about 0.5%, and can be appropriately increased in water-rich or pressurized water formations.

[0082] The fine sand 9 and coarse sand 10 filled in the capillary drainage pipe 7 have a great influence on the drainage capacity. The sand should be screened and cleaned in advance to ensure that the particle size is basically consistent and uniform. The particle size of the coarse sand 10 should not be less than 5mm, and the particle size of the fine sand 9 should not be less than 2mm.

[0083] The diameter of the permeable steel pipe 11 can be considered to be about 4 cm, and it should be ensured that there is a layer of fine sand 9 at the bottom of the steel pipe and a layer of coarse sand 10 on the top, so as to effectively alleviate the adverse effects of the concentrated load inside the underground structure on the permeable steel pipe 11.

[0084] The method provided by the present invention should be noted during implementation:

[0085] 1. The diameter of the water-permeable hole 16 set in the upper half section of the permeable steel pipe 11 must be smaller than the particle size of the coarse sand 10 or gravel to prevent sand particles from entering the capillary drainage pipe 7;

[0086] 2. The water-permeable film 13 disposed at the end of the water-permeable steel pipe 11 needs to have good water-permeability and sand-blocking effects. On the one hand, it ensures that the leaked water collected along the capillary drainage pipe 7 can pass smoothly, and on the other hand, it needs to ensure that a small amount of fine sand is effectively blocked. At the same time, the film 13 can be made of gauze or a water-permeable composite material with a certain durability;

[0087] 3. The length of each section of the permeable steel pipe 11 arranged inside the capillary drainage pipe 7 is fixed and can be flexibly adjusted according to the actual project conditions. The length of a single section can generally be considered to be about 2-3m, and the spacing between adjacent permeable steel pipes 11 can be considered to be 1-2m;

[0088] 4. The two sides of the wedge-shaped channel steel 8 are serrated, and the reserved shape and size of the wedge-shaped channel steel 8 on the underground structure bottom plate 1 must match, to ensure that the wedge-shaped channel steel 8 has a good "clamping" effect after being pressed in, thereby ensuring the stability of the entire capillary drainage pipe 7;

[0089] 5. At the location of the structural deformation joint 4, considering the risk of dislocation and opening of the joint in the later stage, the permeable steel pipe 11 should generally be set away from the deformation joint 4. When it is impossible to avoid it, the location of the deformation joint 4 should be reserved for the steel pipe to pass through.

[0090] The structure of the present invention has the following characteristics and advantages:

[0091] 1) The present invention is based on the concept of "external defense and internal drainage", which improves the concept of underground structure waterproofing and drainage. On the basis of the original fully waterproof exterior of the underground structure, criss-crossing capillary drainage pipes are set inside the structure, which effectively improves the waterproofing and drainage function of the underground structure.

[0092] 2) The advantage of capillary drainage pipes in collecting underground structure leakage is that they are directly connected to the structural joints, which are one of the main causes of leakage. At the same time, the capillary drainage pipes have the function of collecting structural surface leakage along their entire length. Based on the idea of ​​"breaking the whole into parts", any area of ​​the underground structure that is leaking can be effectively collected, effectively avoiding the spread of local leakage, and finally draining it to the sump.

[0093] 3) The new capillary underground structure drainage system and the new underground engineering drainage concept based on "external defense and internal drainage" described in the present invention can meet the needs of underground space development towards depth and large cross-section. The solution has clear ideas, simple processes, and easy construction. It has high economic and social benefits and has broad application prospects in underground structure drainage projects involved in urban underground space development, rail transit, railway projects, etc.

[0094] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. Capillary pipe underground structure drainage system, characterized by: The system comprises an underground structure bottom plate (1) and an underground structure side wall (2); a structural construction joint (3) and a structural deformation joint (4) arranged transversely along the underground structure are arranged on the underground structure bottom plate (1); the structural construction joint (3) and the structural deformation joint (4) extend transversely to the underground structure side wall (2); and a water collection pit (6) is also arranged in the underground structure bottom plate (1); Capillary drainage pipes (7) arranged transversely along the underground structure are provided on both sides of the structural construction joint (3) and the structural deformation joint (4); the capillary drainage pipes (7) on both sides of the structural construction joint (3) and the capillary drainage pipes (7) on both sides of the structural deformation joint (4) are both connected to the capillary drainage pipes (7) arranged longitudinally along the underground structure; the capillary drainage pipes (7) arranged longitudinally run through the structural construction joint (3) and the structural deformation joint (4) and are connected to the sump (6).

2. The capillary channel underground structure drainage system according to claim 1, characterized in that: The capillary drainage pipe (7) is located in a wedge-shaped groove provided on the surface of the underground structure bottom plate (1).

3. The capillary channel underground structure drainage system according to claim 2, characterized in that: An embedded wedge-shaped channel steel (8) is provided in the wedge-shaped groove, and the capillary drainage pipe (7) is located in the embedded wedge-shaped channel steel (8); The lower part of the embedded wedge-shaped channel steel (8) is paved with fine sand (9), the upper part is paved with coarse sand (10), and the capillary drainage pipe (7) is buried therein.

4. The capillary channel underground structure drainage system according to claim 3, characterized in that: The capillary drainage pipeline (7) comprises a water-permeable steel pipe (11), and a water-permeable hole (16) is arranged on the upper part of the pipe wall of the water-permeable steel pipe (11).

5. The capillary channel underground structure drainage system according to claim 4, characterized in that: The permeable steel pipe (11) is arranged in sections at intervals in the capillary drainage pipe (7), and the spaces between adjacent sections are filled with fine sand (9) and coarse sand (10).

6. The capillary channel underground structure drainage system according to claim 5, characterized in that: The water-permeable steel pipe (11) directly passes through the structural construction joint (3); The water-permeable steel pipe (11) is disconnected at the structural deformation joint (4) and is divided into two front and rear sections.

7. The capillary channel underground structure drainage system according to claim 6, characterized in that: Both ends of the segment of the water-permeable steel pipe (11) are provided with a water-permeable film (13) for wrapping; A steel casing (14) is arranged outside the water-permeable steel pipe (11), one end of the steel casing (14) is closed by a steel mesh (15) and the other end is open; The water-permeable steel pipe (11) whose end is closed by the water-permeable film (13) is inserted into the open end of the steel casing (14).

8. The capillary channel underground structure drainage system according to claim 7, characterized in that: The capillary drainage pipe (7) arranged longitudinally is connected to the capillary drainage pipe (7) arranged transversely via a four-way steel pipe (12).

9. The capillary channel underground structure drainage system according to claim 8, characterized in that: The four ends of the four-way steel pipe (12) are all provided with a water-permeable film (13) for wrapping; Steel casings (14) are arranged outside the four ends of the four-way steel pipe (12), and the four ends of the four-way steel pipe (12) are inserted into the steel casings (14), and the other end of the steel casing (14) is closed by a steel wire mesh (15).

10. The construction method of the capillary pipe underground structure drainage system according to claim 9, characterized in that: The method comprises: Cutting the steel pipe and opening a water-permeable hole (16) on the upper half of the pipe wall to obtain a water-permeable steel pipe (11) segment; Making a four-way steel pipe (12); A steel casing (14) is manufactured and sealed at one end of the steel casing (14) with a steel wire mesh (15), and water-permeable films (13) are fixed at both ends of the water-permeable steel pipe (11) segment and at the four ends of the four-way steel pipe (12), and are all inserted into the open end of one of the steel casings (14); Making a wedge-shaped channel steel (8) with both sides being sawtooth-shaped; A parallel wedge-shaped groove is reserved in advance on both sides of the longitudinal direction of the structural construction joint (3) and the structural deformation joint (4), and the wedge-shaped grooves distributed along the longitudinal direction of the underground structure are correspondingly reserved to communicate with the transverse wedge-shaped grooves, and at the same time, a water collection pit (6) is reserved; A wedge-shaped channel steel (8) is pressed into the wedge-shaped groove, and fine sand (9) is filled into the lower half of the wedge-shaped channel steel (8). A permeable steel pipe (11) segment and a four-way steel pipe (12) are placed on the fine sand (9), and coarse sand (10) is covered to fill the wedge-shaped channel steel (8). At the same time, the spaces between adjacent permeable steel pipe (11) segments are filled with fine sand (9) and coarse sand (10).

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