Underground space structure water pressure control system and construction method

Abstract

The present invention relates to a water pressure control system and construction method for an underground space structure, comprising a water collection well, a sedimentation tank and a foundation bottom plate covering the four sides of the wellhead of the water collection well, characterized in that: a plurality of water pressure control systems are arranged on one side of the water collection well, the water pressure control system comprises a filter unit, a water collection unit and a drainage unit, a filter unit is arranged outside the water collection pipe of the water collection unit, and one end of the water collection pipe of the water collection unit is connected to the drainage unit. The advantage is that the water pressure control system can sense, regulate and discharge the underground water pressure in the underground space in real time, ensure that the underground space structure will not work overloaded, avoid serious damage to the underground space structure in the building and potential safety hazards, and ensure the safe use of the building structure. The underground space structure water pressure control system can be applied to all underground space structures and has a wide range of applications.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to an underground space structure water pressure control system and a construction method. Background Art

[0002] At present, as the underground space structures of civil and public buildings become more and more complex, their depth is also gradually increasing. Since the underground space structures in residential buildings are mostly used for underground parking lots, storage rooms, etc., the space requirements are relatively high. In the current structural design process, only the regulatory requirements are often considered, while the following situations are ignored. For example, especially in rainy seasons, short-term heavy rains, or areas with serious water accumulation in low-lying areas and high groundwater levels, sudden changes in water levels will cause significant changes in water pressure. In severe cases, the floor plate and frame columns of the underground space structure will be severely damaged, such as: the foundation floor plate is bulging and cracking, the frame column roots and column tops are crushed under pressure, etc. In severe cases, the entire building may collapse. Summary of the invention

[0003] In order to solve the technical problems existing in the known technology, the present invention provides an underground space structure water pressure control system and construction method which can sense, regulate and discharge groundwater pressure in real time, thereby preventing the underground space structure in the building from being seriously damaged and causing safety hazards.

[0004] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is:

[0005] The water pressure control system of the underground space structure includes a water collection well, a sedimentation tank and a foundation bottom plate covering the four sides of the water collection well mouth, and is characterized in that: a plurality of water pressure control systems are arranged on one side of the water collection well, and the water pressure control system includes a filtering unit, a water collection unit and a drainage unit, a filtering unit is arranged outside the water collection pipe of the water collection unit, and one end of the water collection pipe of the water collection unit is connected to the drainage unit.

[0006] The present invention can also adopt the following technical solutions:

[0007] Preferably, the filtration unit includes a dense mesh, a pebble filter layer and a gravel filter layer arranged under the foundation bottom plate, a steel mesh enclosure is provided between the pebble filter layer and the gravel filter layer, a perforated cement pipe fixed to the brick mold is provided in the gravel filter layer located inside the steel mesh enclosure, a steel mesh is placed on the outer wall of the perforated cement pipe, the steel mesh is fixed by a steel sealing frame, and a plurality of water holes are formed on the pipe wall of the perforated cement pipe.

[0008] Preferably, the water collection unit includes a water collecting pipe, a pressure relief box, a water stop ring and a water diversion pipe. The water collecting pipe is arranged in the central part of the perforated cement pipe of the filter unit, and passes through the brick mold and the foundation bottom plate to be connected with the pressure relief box arranged in the water collection well. The other end of the pressure relief box is connected to the water diversion pipe, and a water stop ring is also installed on the water collecting pipe.

[0009] Preferably, the pressure relief box includes a box body, a spring, a rubber plug, a spring connecting rod, a steel connecting plate, a steel connecting pipe and a steel connecting disk. At least four springs are installed in the box body, one end of the spring is fixed to the side plate of the box body through a spring connecting rod and a bolt, and the other end is fixed to the steel connecting plate through a spring connecting rod. A rubber plug and a valve plate are installed on the other side of the steel connecting plate and are fixed to the steel connecting plate through bolts. A circular hole is opened in the middle of the valve port plate, and the circular hole is made with a wedge-shaped incision. A circular hole concentric with the circular hole of the valve port plate is opened in the middle of the two side plates of the box body, and the outer sides of the two side plates of the box body are fixed to the steel connecting disk through a steel connecting pipe.

[0010] Preferably, the drainage unit includes a water pump and a drainage pipe, and the drainage pipe is connected to the underground space structure pipeline embedded parts and communicated with the external municipal pipeline of the underground space structure pipeline embedded parts.

[0011] A construction method for an underground space structure water pressure control system, characterized in that it comprises the following steps:

[0012] S1. Process the components of the water pressure control system on site. According to the specific structure of the water collection well at the construction site, the water collection pipe, water diversion pipe, pressure relief box, steel mesh enclosure and steel sealing frame are processed according to the design drawings and the size of the water collection well;

[0013] A. The water collecting pipe is made of steel pipe. The pipe diameter can be selected according to the groundwater and rainfall conditions at the project site. Generally, 10CM can be selected. Strip holes are opened in the axial direction of the buried section of the water collecting pipe. The width of the strip holes is greater than 2CM. The length and structure of the buried section are designed according to the water collection demand. A water stop ring is welded at the junction of the water collecting pipe and the wall of the sump. A steel connecting plate is welded at the end of the water collecting pipe. The water collecting pipe is painted with anti-corrosion materials.

[0014] B. The water diversion pipe is made of steel pipe, and the overall shape is L-shaped. The length of its vertical section is set according to the depth of the water collection well. A steel connecting plate is welded at the end of the straight section of the water diversion pipe and connected to the vertical section by welding. The water diversion pipe fittings are painted with anti-corrosion materials;

[0015] C. The body of the pressure relief box is made of steel plate with strength grade Q235. The thickness of the steel plate shall not be less than 5mm. The steel plates are cut and punched in batches according to the design drawings and dimensions. A circular hole is opened in the middle of the two side plates. The diameter of the circular hole shall not be less than 10CM. One end of the rubber plug is made into a wedge shape and a hole is punched in the middle of the rubber plug. The circular hole in the middle of the valve plate is made into a wedge-shaped cut. The cut diameter should match the rubber plug and leave a certain margin. The valve plate is fixed to the rubber plug and the steel connecting plate by bolts. The steel connecting plate is a circular plate. Four spring connecting rods are evenly welded on one side of the plate. The spring connecting rod is welded at the end of the other side plate of the box body. The two ends of the spring are connected with spring connecting rods respectively. The outer sides of the two side plates of the box body are fixed with steel connecting pipes respectively. The steel connecting plate is fixed at the end of the steel connecting pipe. Finally, anti-corrosion materials are applied.

[0016] D. The steel mesh enclosure is composed of an L-shaped steel skeleton and a steel mesh. The vertical section of the L-shaped steel skeleton is tied to the steel mesh, and the straight section is a free section. The height of the vertical section is consistent with the thickness of the gravel filter layer. The straight section only needs to meet the requirements of the erection structure. The L-shaped steel skeleton is evenly arranged on the steel mesh, and the spacing only needs to meet the erection requirements. The diameter of the L-shaped steel skeleton only needs to meet the erection requirements. The steel mesh can be cut according to the needs and meets the structural requirements.

[0017] E. The steel bar sealing frame is made of two longitudinal and transverse steel bars welded together, and the ends of the steel bar sealing frame are bent, and the bending spacing should meet the structural requirements of buckling on the perforated cement pipe;

[0018] S2. Excavation of foundation pit

[0019] Excavate the foundation pit according to the positioning line, expand and deepen the water collection well, and the expansion range shall not be less than the laying range of the filter unit;

[0020] S3, brick formwork

[0021] The brick formwork masonry process is basically the same as the conventional method. The thickness of the formwork should be greater than 380mm. The masonry is suspended at the location of the perforated cement pipe. After the perforated cement pipe and the water collection pipe are installed, the masonry is continued to the elevation position.

[0022] S4. Laying pebble filter layer

[0023] Choose pebbles with a diameter greater than 10CM. When the brick formwork mortar strength within the pebble laying height reaches 100%, start laying the pebble filter layer. Stop laying until about 1 / 2 of the bottom of the perforated cement pipe. After the steel mesh enclosure is installed and a certain thickness of gravel is laid, continue to lay pebbles in layers. The laying thickness is determined according to the lateral pressure resistance of the steel mesh enclosure. Install the perforated cement pipe and water collection pipe until 10CM below the bottom of the foundation slab cushion layer.

[0024] S5. Install steel mesh enclosure

[0025] The prepared steel mesh enclosure is erected along the boundary between the pebble filter layer and the crushed stone filter layer. The whole is in a ring shape, and the end is attached to and fixed to the brick formwork. The straight section of the L-shaped steel frame faces the side of the perforated cement pipe and is pressed firmly with crushed stones to prevent it from tipping over. The lower part of the other side of the steel mesh enclosure is filled and pressed firmly with pebbles;

[0026] S6. Laying gravel filter layer

[0027] Choose gravel with a diameter greater than 3CM. After the steel mesh enclosure is installed in place, start laying the gravel in layers. The laying thickness is determined according to the lateral pressure resistance of the steel mesh enclosure. When the laying reaches the installation position of the perforated cement pipe, pause. After the perforated cement pipe and water collection pipe are installed and the remaining brick formwork is completed and reaches the construction strength, continue laying until it is within 10CM below the cushion layer of the foundation slab;

[0028] S7. Install perforated cement pipes and water collection pipes

[0029] First, wrap the outer side of the perforated cement pipe with at least 3 layers of steel mesh, then install one end of the perforated cement pipe perpendicular to the side of the brick formwork and ensure that the end of the pipe fits the brick formwork. Fasten the other end of the perforated cement pipe with a steel sealing frame and wrap it with at least 3 layers of steel mesh. Press and position it with a small amount of gravel and then start installing the water collecting pipe. Place one section of the water collecting pipe with a filter hole in the center of the perforated cement pipe, install a water stop ring on the other section, and make the water stop ring located at the center line of the side wall of the water collecting well. The water collecting pipe passes through the brick formwork and is connected to the pressure relief box, positioned and reinforced, and then the remaining brick formwork is completed. At this time, fill the gap between the water collecting pipe and the brick formwork with masonry mortar;

[0030] S8. Laying of dense mesh

[0031] Cover the pebble filter layer and the gravel filter layer with a dense mesh, the coverage area is 40CM larger than the outer boundary of the pebble filter layer, and the depth of the mesh buried along the outer wall of the brick mold on the side close to the brick mold should not be less than 20CM, and the thickness should be 10CM±;

[0032] S9. Set up formwork and pour concrete

[0033] Reserve holes on the template in advance, seal them tightly after passing the water collecting pipe, and pour concrete according to the design requirements;

[0034] S10. Install the pressure relief box and water pipe

[0035] Connect the processed pressure relief box to the steel connection plate at the end of the water collecting pipe through bolts, place a rubber ring between the steel connection plates for sealing, and connect the other end of the pressure relief box to the water diversion pipe through the steel connection plate;

[0036] S11. Install water pump and drainage pipe

[0037] Select a water pump, float switch and drain pipe with matching power, connect the drain pipe to the embedded parts of the underground space structure pipeline, and connect it to the external municipal pipeline.

[0038] The advantages and positive effects of the present invention are as follows: since the present invention adopts the above technical solution, that is, by setting a water pressure control system in the water collection well, the pressure of the pressure relief valve can be adjusted according to the maximum water pressure that the underground space structure of different projects can withstand, and the pressure relief valve can be closed in time after the water pressure drops to a safe range, so that it can both control the excessive water pressure and avoid the situation of long-term water flow. A filter unit is installed in the water pressure control system of the underground space structure. By laying a pebble filter layer, a crushed stone filter layer, wrapping a steel mesh in a perforated cement pipe, and laying a dense mesh on the top of the filter layer, it can not only effectively filter the mud and debris in the groundwater, reduce the flow of concrete aggregates and cement slurry, prevent crushed stones from clogging the filter unit and the water collection pipe, extend the service life of the system, and ensure the water collection effect. Installing the water collection pipe inside the perforated cement pipe can reduce the wind direction of the water collection hole clogging, and can also leave enough operating space for replacing the water collection pipe after long-term use, and can effectively ensure the integrity of the filter unit. Through the pressure relief box and the water pump equipped with a float switch, the start and stop can be controlled according to the liquid level in the water collection well. When the water pressure reaches the set value, the spring compresses the piston to open, and the groundwater is discharged into the water collection well through the water diversion pipe. After simple sedimentation, when the liquid level reaches a certain position, the water pump float switch of the drainage unit is closed, and the water is discharged into the municipal rainwater pipe through the drainage pipe to prevent overflow; fully reduce the groundwater pressure, ensure that the underground space structure will not be overloaded, and ensure the safe use of the building structure. This underground space structure water pressure control system can be applied to all underground space structures and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the present invention;

[0040] Figure 2 yes Figure 1 A magnified view of part I in FIG.

[0041] Figure 3 It is a schematic diagram of the internal structure of the pressure relief box of the present invention;

[0042] Figure 4 yes Figure 3 Left view of

[0043] Figure 5 yes Figure 3 AA section view;

[0044] Figure 6 yes Figure 3 BB cross-sectional view;

[0045] Figure 7 yes Figure 3 CC section view;

[0046] Figure 8 This is a structural diagram of the steel bar sealing frame and the perforated cement pipe assembly of the present invention;

[0047] Fig. 9 yes Figure 8 Right view of;

[0048] Fig.10 It is an assembly structure diagram of the water collecting pipe and the water stop ring of the present invention;

[0049] Fig.11 yes Fig.10 Left view of

[0050] Fig.12 yes Fig.10 Right view of .

[0051] In the figure: 1, foundation slab; 2, water collection well; 3, sedimentation tank; 4, filter unit; 401, fine mesh; 402, pebble filter layer; 403, crushed stone filter layer; 404, steel mesh; 405, steel sealing frame; 406, steel mesh enclosure; 407, cushion block; 408, cement pipe with holes; 5, water collection unit; 501, water collection pipe; 5011, strip hole; 502, pressure relief box; 5021, box body; 5022, spring; 5023, rubber plug; 5024, spring connecting rod; 5025, steel connecting plate; 5026, bolt; 5027, valve plate; 5028, steel connecting plate; 5029, steel connecting pipe; 503, water stop ring; 504, water diversion pipe; 6, drainage unit; 601, water pump; 602, drainage pipe; 7, brick mold; 8, municipal pipeline. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] See also Figure 1-Figure 12 ,

[0054] The water pressure control system of the underground space structure includes a water collection well 2, a sedimentation tank 3 and a foundation bottom plate 1 covering the four sides of the water collection well mouth. A plurality of water pressure control systems are arranged side by side on one side of the water collection well. The water pressure control system includes a filter unit 4, a water collection unit 5 and a drainage unit 6. A filter unit is arranged outside the water collection pipe 501 of the water collection unit. One end of the water collection pipe of the water collection unit is connected to the drainage unit. The drainage pipe of the drainage unit is connected to the external municipal pipeline 8.

[0055] In order to reduce the mud content and other debris introduced into the groundwater and prevent clogging of the water collection pipe, a filtration unit is set around the water collection pipe. The filtration unit consists of a pebble filter layer, a steel mesh enclosure, a crushed stone filter layer, a perforated cement pipe, a steel mesh, a steel sealing frame, and a dense mesh. The pebble filter layer is located on the outermost side.

[0056] Specifically, the filtration unit 4 includes a dense mesh 401, a pebble filter layer 402 and a gravel filter layer 403 arranged under the base bottom plate, a steel mesh enclosure 406 is provided between the pebble filter layer and the gravel filter layer, and a perforated cement pipe 408 fixed to the brick mold 7 is provided in the gravel filter layer located inside the steel mesh enclosure, and a steel mesh 404 is placed on the outer wall of the perforated cement pipe, and the steel mesh is fixed by a steel sealing frame 405, and a plurality of water holes are formed on the pipe wall of the perforated cement pipe.

[0057] Specifically, the pebble filter layer uses pebbles with a diameter greater than 10CM. After the mortar strength of the brick formwork 7 within the pebble laying height range reaches 100%, the pebble filter layer is laid, and the laying is stopped at about 1 / 2 of the lower skin of the perforated cement pipe 408. After the steel mesh enclosure 406 is installed and a certain thickness of gravel is laid, the pebbles are continued to be laid in layers. The laying thickness of the pebble filter layer is determined according to the lateral pressure resistance of the steel mesh enclosure to ensure that there is no obvious bulging or inclination, until 10CM below the base layer of the foundation slab 1.

[0058] Specifically, the gravel filter layer 403 uses gravel with a diameter greater than 3CM. After the steel mesh enclosure is installed in place, the gravel is laid in layers. The laying thickness is determined according to the lateral pressure resistance of the steel mesh enclosure to ensure that there is no obvious bulge or tilt. When the laying reaches the installation position of the perforated cement pipe, it is paused, and after the perforated cement pipe and the water collection pipe are installed and the remaining brick formwork is completed and reaches the construction strength, the laying continues until the foundation slab 1 is within 10CM of the cushion layer.

[0059] Specifically, the outer side of the perforated cement pipe 408 is wrapped with at least 3 layers of steel mesh 404, the perforated cement pipe is installed perpendicular to the side of the brick mold and ensures that the end can fit with the brick mold, the other end is fastened with a steel sealing frame 405 and wrapped with more than 3 layers of steel mesh, and then a small amount of crushed stone is used to press and position it before installing the water collecting pipe 501. The water collecting pipe is located on the pipe wall of the buried section and has multiple strip holes. One end of the water collecting pipe with strip holes is placed in the center of the perforated cement pipe. A steel support or pad 407 can be used for auxiliary positioning to ensure the accuracy of its position. The water collecting pipe is equipped with a water stop ring 503, which is located at the center line position of the side wall of the water collecting well. After positioning is completed, it is reinforced and the remaining brick membrane is built. The gap between the water collecting pipe and the brick mold is filled with masonry mortar to prevent leakage and backflow during concrete pouring, which affects the waterproof performance of the concrete.

[0060] Specifically, the dense mesh 401 covers the upper part of the pebble filter layer and the crushed stone filter layer, and the coverage range exceeds the outer boundary of the pebble filter layer by more than 40CM. The side close to the brick mold is buried at a depth of not less than 20CM along the outer wall of the brick mold. The thickness of the dense mesh can be controlled at about 10CM, and the mesh number can be selected according to actual conditions. Its function is to prevent the concrete from clogging the filter unit when pouring concrete. The dense mesh can also be replaced by a water filter board, a heat preservation board, etc., and the laying thickness can meet the structural requirements.

[0061] Specifically, the steel mesh enclosure 406 is composed of an L-shaped steel frame and a steel mesh. The vertical section of the L-shaped steel frame is tied to the steel mesh, and the straight section is a free section. The height of the vertical section is consistent with the thickness of the gravel filter layer, and the straight section only needs to meet the erection structural requirements. The L-shaped steel frame is evenly arranged on the steel mesh, and the spacing meets the erection requirements. The diameter of the L-shaped steel frame meets the erection requirements, and the steel mesh can be cut according to needs to meet the structural requirements.

[0062] Specifically, the steel bar sealing frame 405 is formed by welding two steel bars in the longitudinal direction and two in the transverse direction, and the ends are bent, and the bending spacing can meet the structural requirements of being buckled on the perforated cement pipe.

[0063] Specifically, the water collection unit 5 includes a water collection pipe 501, a pressure relief box 502, a water stop ring 503 and a water diversion pipe 504. The water collection pipe is arranged in the center of the perforated cement pipe 408 of the filter unit, and passes through the brick mold 7 and the foundation bottom plate 1 to communicate with the pressure relief box arranged in the water collection well. The other end of the pressure relief box is connected to the water diversion pipe 504. A water stop ring is also installed on the water collection pipe. In order to ensure the replacement and cleaning requirements of the water collection pipe within the reasonable service life of the building, the distance between the water collection pipe and the inner wall of the perforated cement pipe should be greater than 10CM.

[0064] Specifically, the water collecting pipe 501 is made of steel pipe, and the pipe diameter can be selected according to the groundwater and rainfall conditions at the project site. Generally, 10CM can be selected. The water collecting pipe is provided with strip holes 5011 in the buried section, and the hole width should be controlled to be above 2CM, and should not be too small to prevent clogging. The length and structural style of the buried section can be designed according to the water collection demand, and can be set to T-type, L-type, I-type, etc. A water stop ring 503 is welded at the junction of the water collecting pipe and the foundation base plate 1. The shape of the water stop ring can be circular or rectangular, and can be cut on site as required; strip holes are opened on the pipe wall of the buried section of the water collecting pipe to expand the water collection efficiency; a steel connecting plate is welded at the end of the water collecting pipe, and 6 bolt holes are evenly opened on the connecting plate, and the bolt hole diameter is consistent with the steel connecting plate of the pressure relief box. The water diversion pipe 504 is made of steel pipes of the same specifications, and is generally processed into an L shape. The length of the vertical section is set according to the depth of the water collection well. The end of the straight section is welded with a steel connection plate, and the specifications and style are consistent with the steel connection plate of the water collection pipe, and connected to the vertical section by welding. After the above pipe fittings are processed, they are painted with anti-corrosion materials.

[0065] Specifically, the pressure relief box includes a box body 5021, a spring 5022, a rubber plug 5023, a spring connecting rod 5024, a steel connecting plate 5025, a steel connecting pipe 5029 and a steel connecting disk 5028. At least four springs are installed in the box body. One end of the spring is fixed to the side plate of the box body through a spring connecting rod and a bolt 5026, and the other end is fixed to the steel connecting plate through a spring connecting rod. A rubber plug and a valve plate 5027 are installed on the other side of the steel connecting plate and are fixed to the steel connecting plate through bolts. A circular hole is opened in the middle of the valve plate, and the circular hole is made with a wedge-shaped incision. A circular hole concentric with the circular hole of the valve plate is opened in the middle of the two side plates of the box body. The circular holes of the two side plates are used to connect the steel connecting pipe, which is fixed to the steel connecting disk 5028 through a steel connecting pipe 5029 on the outer side of the two side plates of the box body.

[0066] Specifically, the pressure relief box body sheet material can be a steel plate with a strength grade of Q235 and a thickness greater than 5mm. Cut and punch the batch sheets according to the design drawings and dimensions. A circular hole with a diameter greater than 10CM is opened in the middle of the two side plates of the box body, which can also be adjusted appropriately according to the water flow rate. The rubber plug can be purchased as a finished product or processed by itself. The middle of the rubber plug is punched, and its hole diameter can match the bolt model, and the end is made into a wedge shape. The circular hole in the middle of the valve plate 5027 is made into a wedge-shaped cut, and the cut diameter must match the wedge shape of the end of the rubber plug, and a certain margin is left. When the bolt 5026 passes through the steel connecting plate and connects to the rubber plug, a gasket should be added, and the double nut is tightened at the end of the bolt to prevent loosening and falling off after long-term use. The steel connecting plate 5025 is a circular plate, and 4 spring connecting rods 5024 are evenly welded on one side of it. The diameter is slightly smaller than the inner diameter of the spring, which is convenient for spring installation. The bolts used to fix the spring connecting rod should be made of high carbon steel. The nuts are welded on the inner side of one side plate of the box body. The bolt rod passes through the bolt hole of the side plate and is screwed into the nut. The end spring is welded to the connecting rod, and the spring connecting rod is plugged into the spring. The length of the steel connecting pipe on the outside of the side plate should be greater than the length of the bolt rod to ensure the operating space for screwing the bolt rod. The steel connecting plate 5028 is circular and has 6 bolt holes evenly arranged. The hole diameter is preferably 1-2mm larger than the bolt rod diameter. After the parts of the pressure relief box are processed, they are treated with anti-corrosion and assembled. Except for the bolt connection, other components are welded.

[0067] Specifically, the drainage unit 6 includes a water pump 601 and a drainage pipe 602. The drainage pipe is connected to the underground space structure pipeline embedded component and communicated with the external municipal pipeline 8 of the underground space structure pipeline embedded component.

[0068] A construction method for an underground space structure water pressure control system comprises the following steps:

[0069] S1. Process the components of the water pressure control system on site. According to the specific structure of the water collection well at the construction site, the water collection pipe, water diversion pipe, pressure relief box, steel mesh enclosure and steel sealing frame are processed according to the design drawings and the size of the water collection well.

[0070] A. The water collecting pipe is made of steel pipe. The pipe diameter can be selected according to the groundwater and rainfall conditions at the project site. Generally, 10CM can be selected. Strip holes are opened axially in the buried section of the water collecting pipe. The width of the strip holes is greater than 2CM. The length and structural style of the buried section are designed according to the water collection demand. A water stop ring is welded at the junction of the water collecting pipe and the sump wall, a steel connecting plate is welded at the end of the water collecting pipe, and the water collecting pipe is coated with anti-corrosion material.

[0071] B. The water diversion pipe is made of steel pipe with an overall L-shaped shape. The length of its vertical section is set according to the depth of the water collection well. A steel connecting plate is welded at the end of the straight section of the water diversion pipe and connected to the vertical section by welding. The water diversion pipe fittings are coated with anti-corrosion materials.

[0072] C. The body of the pressure relief box is made of steel plate with strength grade Q235. The thickness of the steel plate shall not be less than 5mm. The steel plates are cut and punched in batches according to the design drawings and dimensions. A circular hole is opened in the middle of the two side plates with a diameter of not less than 10CM. One end of the rubber plug is made into a wedge shape, and a hole is punched in the middle of the rubber plug. The circular hole in the middle of the valve plate is made into a wedge-shaped incision, and its incision diameter should match the rubber plug and leave a certain margin; the valve plate is fixed to the rubber plug and the steel connecting plate by bolts. The steel connecting plate is a circular plate with 4 spring connecting rods evenly welded on one side. The spring connecting rod is welded at the end of the other side plate of the box body. The two ends of the spring are connected with spring connecting rods respectively. The outer sides of the two side plates of the box body are fixed with steel connecting pipes respectively, and the ends of the steel connecting pipes are fixed with steel connecting plates. Finally, anti-corrosion materials are applied.

[0073] D. The steel mesh enclosure is composed of an L-shaped steel frame and a steel mesh. The vertical section of the L-shaped steel frame is tied to the steel mesh, and the straight section is a free section. The height of the vertical section is consistent with the thickness of the gravel filter layer. The straight section only needs to meet the requirements of the erection structure. The L-shaped steel frame is evenly arranged on the steel mesh, and the spacing only needs to meet the erection requirements. The diameter of the L-shaped steel frame only needs to meet the erection requirements. The steel mesh can be cut according to needs as long as it meets the structural requirements.

[0074] E. The steel bar sealing frame is made of two longitudinal and transverse steel bars welded together, and the ends of the steel bar sealing frame are bent, and the bending spacing should meet the structural requirements of being buckled on the perforated cement pipe.

[0075] S2. Excavation of foundation pit

[0076] Excavate the foundation pit according to the positioning line, expand and deepen the water collection well, and the expansion range must not be smaller than the laying range of the filtration unit.

[0077] S3, brick formwork

[0078] The laying process of brick formwork is basically the same as the conventional practice. The thickness of the formwork should be greater than 380mm. Laying is stopped at the position of the perforated cement pipe. After the perforated cement pipe and the water collecting pipe are installed, laying is continued to the elevation position.

[0079] S4. Laying pebble filter layer

[0080] Choose pebbles with a diameter greater than 10CM. Start laying the pebble filter layer after the brick formwork mortar strength within the pebble laying height reaches 100%. Stop laying when it reaches about 1 / 2 of the bottom of the perforated cement pipe. After the steel mesh enclosure is installed and a certain thickness of gravel is laid, continue laying pebbles in layers. The laying thickness is determined according to the lateral pressure resistance of the steel mesh enclosure. Install the perforated cement pipe and water collection pipe until 10CM below the bottom slab cushion layer of the foundation.

[0081] S5. Install steel mesh enclosure

[0082] The prepared steel mesh enclosure is erected along the boundary between the pebble filter layer and the crushed stone filter layer. The whole is in a ring shape, and the end is attached and fixed to the brick formwork. The straight section of the L-shaped steel frame faces the side of the perforated cement pipe and is pressed firmly with crushed stones to prevent tipping over. The lower part of the other side of the steel mesh enclosure is filled and pressed firmly with pebbles.

[0083] S6. Laying gravel filter layer

[0084] Choose gravel with a diameter greater than 3CM, and start laying the gravel in layers after the steel mesh enclosure is installed in place. The laying thickness is determined according to the lateral pressure resistance of the steel mesh enclosure. Pause when laying to the installation position of the perforated cement pipe. Wait until the perforated cement pipe and water collection pipe are installed and the remaining brick formwork is completed and reaches the construction strength, and then continue laying until it is within 10CM under the cushion layer of the foundation slab.

[0085] S7. Install perforated cement pipes and water collection pipes

[0086] First, wrap the outside of the perforated cement pipe with at least 3 layers of steel mesh, then install one end of the perforated cement pipe perpendicular to the side of the brick formwork and ensure that the end of the pipe fits the brick formwork. Fasten the other end of the perforated cement pipe with a steel sealing frame and wrap it with at least 3 layers of wire mesh. Press and position it with a small amount of gravel and then start installing the water collecting pipe. Place one section of the water collecting pipe with a filter hole in the center of the perforated cement pipe, and install a water stop ring on the other section, and make the water stop ring located on the center line of the side wall of the water collecting well. The water collecting pipe passes through the brick formwork and is connected to the pressure relief box. It is positioned and reinforced, and then the remaining brick membrane is completed. At this time, fill the gap between the water collecting pipe and the brick formwork with masonry mortar to prevent leakage and backflow when pouring concrete, which will affect the waterproof performance of the concrete.

[0087] S8. Laying of dense mesh

[0088] The dense mesh is covered on the pebble filter layer and the upper part of the crushed stone filter layer, with the coverage area larger than the outer boundary of the pebble filter layer by 40CM, and the buried depth along the outer wall of the brick mold near the brick mold shall not be less than 20CM, and the thickness shall be 10CM±. The above technical data can also be selected according to the actual situation of the building, and its function is to prevent the concrete from clogging the filter unit when pouring concrete. The dense mesh can also be replaced by a water filter board, a heat preservation board, etc., and its laying thickness can meet the structural requirements.

[0089] S9. Set up formwork and pour concrete

[0090] Reserve holes on the template in advance, seal them tightly after passing through the water collecting pipe, pour concrete according to the design requirements, control the slump of concrete during pouring, and carry out maintenance in time after pouring.

[0091] S10. Install the pressure relief box and water pipe

[0092] The processed pressure relief box is connected to the steel connecting plate at the end of the water collecting pipe by bolts, and a rubber ring is placed between the steel connecting plates for sealing. The other end of the pressure relief box is connected to the water diversion pipe through the steel connecting plate.

[0093] S11. Install water pump and drainage pipe

[0094] Select a water pump, float switch and drain pipe with appropriate power, connect the drain pipe to the embedded parts of the underground space structure pipeline, and connect it to the external municipal pipeline.

[0095] The local underground space structure water pressure control system can sense the water pressure in real time through the water collection unit. When the water pressure reaches the set value, the spring compresses the piston to open, and the groundwater is discharged into the water collection well through the water diversion pipe. After simple sedimentation, the liquid level reaches a certain position and the water pump float switch of the drainage unit is closed, and the water is discharged into the municipal rainwater pipe through the drainage pipe.

[0096] The embodiments described in the drawings of the present invention are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

Claims

1. A construction method for an underground space structure water pressure control system, comprising a water collection well, a sedimentation tank and a foundation bottom plate covering the water collection well mouth, characterized in that: A plurality of water pressure control systems are arranged on one side of the water collection well, and the water pressure control system includes a filtering unit, a water collection unit and a drainage unit. A filtering unit is arranged outside the water collection pipe of the water collection unit, and a drainage unit is arranged on the other side of the water collection pipe of the water collection unit; The filtering unit comprises a dense mesh, a pebble filter layer and a gravel filter layer arranged below the base bottom plate, a steel mesh enclosure is arranged between the pebble filter layer and the gravel filter layer, a perforated cement pipe fixed to the brick mold is arranged in the gravel filter layer located inside the steel mesh enclosure, a steel mesh is arranged on the outer wall of the perforated cement pipe, the steel mesh is fixed by a steel sealing frame, and a plurality of water holes are formed on the pipe wall of the perforated cement pipe; The water collection unit includes a water collection pipe, a pressure relief box, a water stop ring and a water diversion pipe. The water collection pipe is arranged in the middle of the perforated cement pipe of the filter unit, and passes through the brick mold and the side wall of the water collection well to communicate with the pressure relief box arranged in the water collection well. The other end of the pressure relief box is connected to the water diversion pipe. The water collection pipe is also equipped with a water stop ring. The pressure relief box comprises a box body, a spring, a rubber plug, a spring connecting rod, a steel connecting plate, a steel connecting pipe and a steel connecting plate. At least four springs are installed in the box body. One end of the spring is fixedly connected to the side plate of the box body through a spring connecting rod and a bolt, and the other end is fixed to the steel connecting plate through a spring connecting rod. A rubber plug and a valve plate are installed on the other side of the steel connecting plate and fixed to the steel connecting plate through bolts. A circular hole is opened in the middle of the valve plate, and the circular hole is made with a wedge-shaped cut. A circular hole concentric with the circular hole of the valve plate is opened in the middle of the two side plates of the box body. The outer sides of the two side plates of the box body are fixedly connected to the steel connecting plate through a steel connecting pipe. The drainage unit includes a water pump and a drainage pipe, the drainage pipe is connected to the underground space structure pipeline embedded part, and is connected to the external municipal pipeline of the underground space structure pipeline embedded part; The construction method of the underground space structure water pressure control system comprises the following steps: S1. Process the components of the water pressure control system on site. According to the specific structure of the water collection well at the construction site, the water collection pipe, water diversion pipe, pressure relief box, steel mesh enclosure and steel sealing frame are processed according to the design drawings and the size of the water collection well; A. The water collecting pipe is made of steel pipe, and the pipe diameter can be selected according to the groundwater and rainfall conditions at the project site. A strip hole is opened in the axial direction of the buried section of the water collecting pipe, and the width of the strip hole is greater than 2CM. The length and structure of the buried section are designed according to the water collection demand. A water stop ring is welded at the junction of the water collecting pipe and the wall of the sump, and a steel connecting plate is welded at the end of the water collecting pipe. The water collecting pipe is painted with anti-corrosion materials; B. The water diversion pipe is made of steel pipe, and the overall shape is L-shaped. The length of its vertical section is set according to the depth of the water collection well. A steel connecting plate is welded at the end of the straight section of the water diversion pipe and connected to the vertical section by welding. The water diversion pipe fittings are painted with anti-corrosion materials; C. The body of the pressure relief box is made of steel plate with strength grade Q235. The thickness of the steel plate shall not be less than 5mm. The steel plates are cut and punched in batches according to the design drawings and dimensions. A circular hole is opened in the middle of the two side plates. The diameter of the circular hole shall not be less than 10CM. One end of the rubber plug is made into a wedge shape and a hole is punched in the middle of the rubber plug. The circular hole in the middle of the valve plate is made into a wedge-shaped cut. The cut diameter should match the rubber plug and leave a certain margin. The valve plate is fixed to the rubber plug and the steel connecting plate by bolts. The steel connecting plate is a circular plate. Four spring connecting rods are evenly welded on one side of the plate. The spring connecting rod is welded at the end of the other side plate of the box body. The two ends of the spring are connected with spring connecting rods respectively. The outer sides of the two side plates of the box body are fixed with steel connecting pipes respectively. The steel connecting plate is fixed at the end of the steel connecting pipe. Finally, anti-corrosion materials are applied. D. The steel mesh enclosure is composed of an L-shaped steel skeleton and a steel mesh. The vertical section of the L-shaped steel skeleton is tied to the steel mesh, and the straight section is a free section. The height of the vertical section is consistent with the thickness of the gravel filter layer. The straight section only needs to meet the requirements of the erection structure. The L-shaped steel skeleton is evenly arranged on the steel mesh, and the spacing only needs to meet the erection requirements. The diameter of the L-shaped steel skeleton only needs to meet the erection requirements. The steel mesh can be cut according to the needs and meets the structural requirements. E. The steel bar sealing frame is made of two longitudinal and transverse steel bars welded together, and the ends of the steel bar sealing frame are bent, and the bending spacing should meet the structural requirements of buckling on the perforated cement pipe; S2. Excavation of foundation pit Excavate the foundation pit according to the positioning line, expand and deepen the water collection well, and the expansion range shall not be less than the laying range of the filter unit; S3, brick formwork The brick formwork masonry process is the same as the conventional practice. The thickness of the formwork should be greater than 380mm. The masonry is suspended at the location of the perforated cement pipe. After the perforated cement pipe and the water collection pipe are installed, the masonry is continued to the elevation position. S4. Laying pebble filter layer Choose pebbles with a diameter greater than 10CM. When the brick formwork mortar strength within the pebble laying height reaches 100%, start laying the pebble filter layer. Stop laying until the 1 / 2 position of the bottom skin of the perforated cement pipe. After the steel mesh enclosure is installed and a certain thickness of gravel is laid, continue to lay pebbles in layers. The laying thickness is determined according to the lateral pressure resistance of the steel mesh enclosure. Install the perforated cement pipe and water collection pipe until 10CM below the bottom skin of the foundation slab cushion layer. S5. Install steel mesh enclosure The prepared steel mesh enclosure is erected along the boundary between the pebble filter layer and the crushed stone filter layer. The whole is in a ring shape, and the end is attached to and fixed to the brick formwork. The straight section of the L-shaped steel frame faces the side of the perforated cement pipe and is pressed firmly with crushed stones to prevent it from tipping over. The lower part of the other side of the steel mesh enclosure is filled and pressed firmly with pebbles; S6. Laying gravel filter layer Choose gravel with a diameter greater than 3CM. After the steel mesh enclosure is installed in place, start laying the gravel in layers. The laying thickness is determined according to the lateral pressure resistance of the steel mesh enclosure. When the laying reaches the installation position of the perforated cement pipe, pause. After the perforated cement pipe and water collection pipe are installed and the remaining brick formwork is completed and reaches the construction strength, continue laying until it is within 10CM of the bottom plate cushion layer; S7. Install perforated cement pipes and water collection pipes First, wrap the outer side of the perforated cement pipe with at least 3 layers of steel mesh, then install one end of the perforated cement pipe perpendicular to the side of the brick formwork and ensure that the end of the pipe fits the brick formwork. Fasten the other end of the perforated cement pipe with a steel sealing frame and wrap it with at least 3 layers of steel mesh. Press and position it with a small amount of gravel and then start installing the water collecting pipe. Place one section of the water collecting pipe with a filter hole in the center of the perforated cement pipe, install a water stop ring on the other section, and make the water stop ring located at the center line of the side wall of the water collecting well. The water collecting pipe passes through the brick formwork and is connected to the pressure relief box, positioned and reinforced, and then the remaining brick formwork is completed. At this time, fill the gap between the water collecting pipe and the brick formwork with masonry mortar; S8. Laying of dense mesh Cover the pebble filter layer and the gravel filter layer with a dense mesh, the coverage area is 20CM larger than the pebble filter, and the thickness is 10CM; the outer boundary of the layer is 40CM, and the buried depth along the outer wall of the brick mold on the side close to the brick mold should not be less than 10CM thick; S9. Set up formwork and pour concrete Reserve holes on the template in advance, seal them tightly after passing the water collecting pipe, and pour concrete according to the design requirements; S10. Install the pressure relief box and water pipe Connect the processed pressure relief box to the steel connection plate at the end of the water collecting pipe through bolts, place a rubber ring between the steel connection plates for sealing, and connect the other end of the pressure relief box to the water diversion pipe through the steel connection plate; S11. Install water pump and drainage pipe Select a water pump, float switch and drain pipe with matching power, connect the drain pipe to the embedded parts of the underground space structure pipeline, and connect it to the external municipal pipeline.

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