Block basement bottom plate drainage structure and construction method thereof

Abstract

The invention belongs to the field of civil construction and traffic engineering, and particularly relates to a partitioned basement bottom plate drainage structure and a construction method thereof.The partitioned basement bottom plate drainage structure comprises a supporting structure and a plurality of partitioned bottom plates arranged at intervals, and a gap between every two adjacent partitioned bottom plates forms a structural joint; a plurality of cast-in-place piles extending in the stratum direction are arranged below the block bottom plate, drainage holes penetrating in the axial direction are formed in the cast-in-place piles, drainage pipes are arranged between the block bottom plate and the cast-in-place piles, and drainage branch pipes inserted into the drainage holes are arranged on the drainage pipes; a drainage ditch is arranged below each structural joint and connected to a water collecting well. By arranging the structural joints and the drainage ditches, the whole bottom plate is divided into the multiple block bottom plates, the block bottom plates have the effects of reducing internal force of the whole bottom plate and reducing mass concrete pouring hydration heat, water buoyancy of the block bottom plates is released through drainage of the drainage ditches, and the underground water level is controlled to be below the block bottom plates; and the anti-floating safety of the building is ensured.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering and traffic engineering, and specifically relates to a block basement floor drainage structure and a construction method thereof. Background Art

[0002] Anti-floating safety is an inevitable major issue for high-rise buildings in cities, especially in flood-inundated areas, and throughout their life cycle. With the development of densely built areas in cities towards high-rise and super-high-rise buildings, the intensity and scale of underground space development and utilization are increasing, and the disaster problems caused by groundwater buoyancy are becoming more and more serious. With the frequent occurrence of extreme weather disasters around the world, floods that occur once every 100 years are increasing. Due to the implementation of the South-to-North Water Diversion Project, the groundwater level in the northern region has completely changed the situation in which the groundwater level in the northern region has become lower and lower due to over-exploitation of groundwater, and the anti-floating safety issue has also become a prominent issue. Geotechnical and structural engineers are accustomed to traditional design concepts, relying entirely on passive anti-floating of weights or anti-floating piles / anchors. It is common for groundwater levels to exceed the defense water level, resulting in floating accidents.

[0003] In recent years, structural engineers and geotechnical engineers have realized that the groundwater level is mainly affected by natural weather factors, and the groundwater level changes over time. The defense water level is determined by the designer. Once determined, it cannot be changed. Therefore, the engineering community began to try to reduce the anti-floating method of groundwater level by drainage. For example, the water cut-off curtain + large-diameter sandless concrete precipitation well is used to reduce the water buoyancy of the basement floor. For riverside terrain, it is very useful to reduce the super-high groundwater level during the flood season when the river water level is super-high. For another example, a drainage structure is set under the basement floor, and the water pressure sensor controls the pump start switch. When the groundwater pressure exceeds the limit, the pump can be started to drain water automatically. All of the above are to reduce the super-high groundwater level to below the defense water level through a pressure relief well, a pressure relief valve or a drainage pipe. The pressure relief well, the pressure relief valve or the drainage pipe are all located under the floor. The separate construction occupies the total construction period of the basement, and the change of the floor drainage structure is not considered, which brings about the improvement of the internal force distribution of the floor, as well as the advantages of reducing the floor thickness, the amount of reinforcement and the cost of the project. Summary of the invention

[0004] In order to solve the problems in the above-mentioned background technology, the present invention provides a block basement floor drainage structure and a construction method thereof. By configuring the basement floor into multiple block floors, structural joints are formed between the block floors, which greatly reduces the hydrothermal treatment of large-volume concrete pouring, reduces the internal force of the floor, reduces the amount of floor steel bars used, and saves engineering costs.

[0005] The first aspect of the present invention is to provide a block basement floor drainage structure, comprising:

[0006] Support structure, the support structure encloses the basement space;

[0007] A plurality of partitioned bottom plates are arranged at intervals in a transverse direction, wherein the partitioned bottom plates are arranged at the bottom of the basement space, and a gap between two partitioned bottom plates adjacent in a transverse direction forms a structural joint;

[0008] A plurality of cast-in-place piles are arranged below the block bottom plate and extend toward the stratum, and the cast-in-place piles are provided with axially penetrating drainage holes;

[0009] A drainage pipe is arranged between the block bottom plate and the cast-in-place piles, and a drainage branch pipe is arranged on the drainage pipe and inserted into the drainage hole;

[0010] The drainage ditch corresponds to the structural joint one by one and is arranged below the structural joint. The drainage pipe is connected to the drainage ditch and the water collection well, and the drainage ditch is connected to the water collection well.

[0011] Furthermore, the depth of the structural joint is the same as the thickness of the block bottom plate, the width of the structural joint is smaller than the width of the drainage ditch, a countersunk hole is provided at the upper end of the structural joint, a strip cover with the same length as the structural joint is installed in the countersunk hole, and the upper end surface of the strip cover is flush with the top surface of the block bottom plate.

[0012] Furthermore, when the lower end of the cast-in-place pile is located in the soil layer or the sand layer, the bottom of the drainage hole is filled with a filter layer.

[0013] Furthermore, a three-layer filter layer is provided at the bottom of the drainage hole, which are a geotextile filter layer, a melon stone filter layer and a coarse sand filter layer from bottom to top.

[0014] Furthermore, a water stop ring is installed at the connection between the drainage branch pipe and the drainage hole.

[0015] Furthermore, the surroundings and bottom edges of the drainage ditch and the sump are wrapped with waterproof panels, and the connection between the drainage ditch and the drainage pipe, and the connection between the sump and the drainage pipe are sealed with waterproof glue.

[0016] Furthermore, the cast-in-place piles are connected to the lower surface of the block bottom plate through the cap, the drainage pipe is a horizontal drainage pipe, the horizontal drainage pipe passes through the cap horizontally, the drainage branch pipe passes through the cap vertically, and the drainage pipes between the cast-in-place piles are interconnected.

[0017] Furthermore, a water pump is installed in the water collection well, the water pump is connected to a drainage main pipe, the drainage main pipe extends to the ground, and a drainage valve is provided on the part of the drainage main pipe located on the ground; a manhole cover is installed on the water collection well.

[0018] Furthermore, the drainage hole is a pile core extraction detection hole or an ultrasonic detection tube pre-buried in the cast-in-place pile.

[0019] A second aspect of the present invention is to provide a construction method, comprising the following steps:

[0020] S1: Construction of foundation pit support structure, excavation to the bottom, cutting of pile heads, pouring of bottom plate cushion; construction of drainage holes for cast-in-place piles using drilling rigs;

[0021] S2: Installation of filter layer for drainage hole of cast-in-place pile. If the pile end of cast-in-place pile has entered the bedrock, there is no need to fill the drainage hole with sediment filter layer. If the pile end of cast-in-place pile has entered the soil layer or sand layer, fill the filter layer at the bottom of the drainage hole.

[0022] S3: Drain pipe installation: insert drainage branch pipe into the drainage hole in the cast-in-place pile, the drainage branch pipe is connected to the drainage pipe, and the drainage pipes between the cast-in-place piles are connected to each other;

[0023] S4: Construction of drainage ditch and water collection well, wrapping waterproof board around and at the bottom of drainage ditch and water collection well, making mortar protective layer, erecting formwork, tying up steel bars of drainage ditch and water collection well, pouring concrete, connecting drainage pipe to drainage ditch and water collection well, and connecting drainage ditch to water collection well;

[0024] S5: Construction of block bottom plate, construction of waterproof board above the bottom plate cushion layer, making mortar protective layer, setting the structural joints between adjacent block bottom plates above the drainage ditch, tying the steel bars of the block bottom plates respectively, the steel bars between the block bottom plates are not connected, erecting formwork at the location of the structural joints, pouring the block bottom plate concrete, and laying strip covers on the structural joints;

[0025] S6: Drainage system installation.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1) The present invention proposes a block basement floor drainage structure, which fully combines the large-area basement floor structural design, post-cast strip construction technology and drainage pressure reduction and anti-floating design. The combination of structural joints and drainage ditches has the triple functions of drainage pressure reduction and anti-floating, floor block and elimination of post-cast strips during floor construction. There are gaps between the block floors, and the steel bars on the block floors are not connected, eliminating the common quality problem of water leakage caused by post-cast strips. The block basement floor structure can reduce the hydration heat of large-volume concrete pouring, reduce the internal force of the floor, reduce the thickness of the floor and reduce the amount of steel bars used in the floor, thereby shortening the construction period, saving engineering costs and improving the overall benefits of underground engineering construction.

[0028] 2) The present invention ingeniously utilizes the pile core extraction detection hole or the pre-buried ultrasonic detection tube as the groundwater drainage channel, so that one hole can be used for multiple purposes, thus reducing the construction process and saving construction time and cost.

[0029] 3) The present invention connects all the drainage holes in the cast-in-place piles to the drainage pipe through drainage branches, ensuring that all groundwater exceeding the bottom surface of the base plate is discharged by gravity, controlling the groundwater level below the bottom surface of the base plate, and ensuring the anti-floating safety of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a plan view of the basement floor drainage structure of the present invention;

[0032] Figure 2 for Figure 1 Middle AA section;

[0033] Figure 3 for Figure 1 Middle BB section;

[0034] Figure 4 It is a plan view of the arrangement of drainage holes and drainage pipes of the cast-in-place pile of the present invention;

[0035] Figure 5 It is a cross-sectional view of the water collection well of the present invention;

[0036] Figure 6 It is a cross-sectional view of the drainage ditch of the present invention;

[0037] Figure 7 This is a cross-sectional view of the drainage hole of the cast-in-place pile of the present invention;

[0038] Figure 8 It is a plan view of the drainage hole of the cast-in-place pile of the present invention;

[0039] Fig. 9 This is a cross-sectional view of the drainage hole of the cast-in-place pile of the present invention;

[0040] Fig.10 This is a structural diagram of the connection between the drainage branch pipe and the drainage hole of the present invention.

[0041] Among them: 1-support structure, 2-block bottom plate, 3-structural joint, 301-strip cover, 4-cast pile, 401-drainage hole, 402-geotextile filter layer, 403-guami stone filter layer, 404-coarse sand filter layer, 405-water stop ring, 5-drainage pipe, 501-drainage branch pipe, 6-drainage ditch, 601-waterproof board, 602-waterproof glue, 7-collection well, 701-water pump, 702-drainage main pipe, 703-drainage valve, 704-well cover, 8-bedrock, 9-capping platform, 10-drilling rig, 101-drill rod, 102-core tube, 103-alloy drill bit, 11-basement exterior wall. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0043] The following is combined with Figure 1-10 The present invention is described in detail with reference to specific embodiments.

[0044] like Figure 1-10 As shown, the present invention provides a block basement floor drainage structure, comprising: a supporting structure 1, the supporting structure 1 can be a supporting pile or a supporting wall, a basement outer wall 11 is constructed on the inner side of the supporting structure 1, and the basement outer wall 11 surrounds the basement space; a plurality of laterally spaced block bottom plates 2 are arranged at the bottom of the basement space, and a gap between two laterally adjacent block bottom plates 2 forms a structural seam 3, that is, there is no connection relationship between the two adjacent block bottom plates 2, and each is independent; a plurality of cast-in-place piles 4 extending toward the stratum direction are arranged below the block bottom plates 2, and a portion of the cast-in-place piles 4 are provided with axially penetrating drainage holes 401; the block bottom A drainage pipe 5 is arranged between the plate 2 and the cast-in-place pile 4, and a drainage branch pipe 501 is arranged on the drainage pipe 5 and inserted into the drainage hole 401; a drainage ditch 6 is arranged under each structural joint 2, and the extension length of the drainage ditch 6 in the horizontal direction is the same as the extension length of the structural joint 2 in the horizontal direction. One end of the drainage ditch 6 is connected to the water collection well 7, and some drainage pipes 5 are directly connected to the drainage ditch 6 to guide the groundwater into the drainage ditch 6, and then flow into the water collection well 7 through the drainage ditch 6. Some drainage pipes 5 can be directly connected to the water collection well 7. The ultimate goal is to guide the groundwater into the water collection well 7 and then drain the water out through the water pump 701.

[0045] The present application fully combines the large-area basement floor structural design, post-cast strip construction technology and drainage, decompression and anti-floating design, and the combination of structural joints and drainage ditches has the triple functions of drainage, decompression and anti-floating, floor block and elimination of post-cast strips during floor construction; by dividing the entire basement floor into multiple block floors 2, there are structural joints 3 between the block floors 2, so that the steel bars on the block floors 2 are not connected, and the common quality problem of water leakage caused by post-cast strips is eliminated; at the same time, the block floor structure can reduce the hydration heat of large-volume concrete pouring, reduce the internal force of the floor, reduce the thickness of the floor and reduce the amount of steel bars used in the floor, thereby shortening the construction period, saving engineering costs and improving the overall benefits of underground engineering construction.

[0046] Specifically, Figure 3 , Figure 4 , Figure 6As shown, the depth of the structural joint 3 is the same as the thickness of the block bottom plate 2, and the width of the structural joint 3 is smaller than the width of the drainage ditch 6, that is, the structural joint 3 is formed by the gap between the two block bottom plates 2, and the width of the structural joint 3 is not less than 20 mm. A countersunk hole is provided at the upper end of the structural joint 3, and a strip cover 301 with the same length as the structural joint 3 is installed in the countersunk hole. The upper end surface of the strip cover 301 is flush with the top surface of the block bottom plate 2, so that the bottom surface of the basement is flat as a whole. The material of the strip cover 301 can be selected as a steel plate.

[0047] Specifically, Figure 7 , Fig. 9 As shown, due to the different construction environments of the basements, their stratum structures are also different. When the pile end of the bored pile 4 enters the bedrock 8, there is no need to fill the silt filter layer in the drainage hole 401; when the pile end of the bored pile 4 is located in the soil layer or sand layer, the filter layer is filled at a height of not less than 3.0m at the bottom of the drainage hole 401. In a preferred embodiment, a three-layer filter layer is provided at the bottom of the drainage hole 401, which are a geotextile filter layer 402, a melon stone filter layer 403 and a coarse sand filter layer 404 from bottom to top. The setting of the above filter layer can improve the water flow capacity, effectively filter the silt, and prevent the silt from being discharged into the drainage ditch 6 or the water collection well 7; however, the filter layer of the present application is not limited thereto, and those skilled in the art can make an adaptive selection according to the soil layer conditions.

[0048] Specifically, Fig.10 As shown, the drain pipe 5 is a horizontal drain pipe, and the drain branch pipe 501 is a tee pipe, which is connected to the horizontal drain pipe. One of the vertical branches of the tee pipe is inserted into the drain hole 401, and a water stop ring 405 is installed at the connection between the vertical branch pipe and the drain hole 401 to ensure the sealing of the drainage process.

[0049] Specifically, Figure 5 , Figure 6 As shown, the drainage ditch 6 and the water collection well 7 are wrapped around and at the bottom with waterproof boards 601, and the connection between the drainage ditch 6 and the drainage pipe 5, and the connection between the water collection well 7 and the drainage pipe 5 are sealed with waterproof glue 602. The waterproof boards 601 are provided to prevent water from leaking into the formation in the drainage ditch 6 and the water collection well 7, and the waterproof glue 602 is provided to prevent water from leaking into the formation before flowing into the drainage ditch 6 and the water collection well 7.

[0050] Specifically, Figure 3As shown, the cast-in-place piles 4 are connected to the lower surface of the block bottom plate 2 through the cap 9, the drainage pipe 5 is a horizontal drainage pipe, the horizontal drainage pipe passes through the cap 9 horizontally, the drainage branch pipe 501 passes through the cap 9 vertically, and the drainage pipes 5 between the cast-in-place piles 4 are interconnected. The drainage ditch 6, the water collection well 7, the drainage pipe 5 and the drainage branch pipe 501 are all arranged below the block bottom plate 2 to ensure that all groundwater exceeding the bottom surface of the block bottom plate 2 is discharged by gravity, thereby controlling the groundwater level below the bottom surface of the block bottom plate 2 to ensure the anti-floating safety of the building.

[0051] Specifically, Figure 2 , Figure 5 As shown, a water pump 701 is installed in the water collection well 7, and the water pump 701 is connected to a drainage main pipe 702, which extends to the ground. A drainage valve 703 is provided on the ground portion of the drainage main pipe 702; a manhole cover 704 is installed on the water collection well 7. Groundwater flows into the drainage ditch 6 by gravity, flows into the water collection well 7 through the drainage ditch 6, and is finally discharged by the water pump 701.

[0052] Specifically, the drainage hole 401 is a pile core extraction inspection hole or an ultrasonic inspection tube pre-buried in the bored pile 4, wherein the pile core extraction inspection hole is constructed by using a drilling rig 10, a drill rod 101 is installed on the drilling rig 10, a core tube 102 is installed at the bottom of the drill rod 101, an alloy drill bit 103 is installed at the lower end of the core tube 102, a hole is drilled in the bored pile 4 by the alloy drill bit 103, and the ultrasonic inspection tube is pre-buried by tying the ultrasonic tube to the steel cage of the bored pile 4. The pile core extraction inspection hole or the ultrasonic inspection tube is used to inspect the pile body. After the pile body quality inspection is completed, it can be used as a drainage hole, realizing multiple uses of one hole, thereby reducing construction procedures, saving construction time and cost.

[0053] The present invention also provides a construction method, comprising the following steps:

[0054] S1: Construction of foundation pit support structure, excavation to the bottom, pile heads of cast-in-place piles 4 cut, and pouring of bottom plate cushion layer; core extraction test holes are constructed on cast-in-place piles 4 by using drilling rig 10, or ultrasonic tubes are tied to the steel cage of cast-in-place piles 4 for pre-embedding, and quality inspection of cast-in-place piles 4 is carried out through core extraction test holes or ultrasonic tubes. After the inspection is completed, the pile core extraction holes or ultrasonic tubes are used as drainage holes 401;

[0055] S2: Installation of filter layer for drainage hole of bored pile. If the pile end of bored pile 4 has entered bedrock 8, there is no need to fill sediment filter layer in drainage hole 401. If the pile end of bored pile 4 enters soil layer or sand layer, a filter layer is filled in three layers within a height of not less than 3.0m at the bottom of drainage hole 401. The lower, middle and upper layers are filled with geotextile filter element, melon stone and coarse sand respectively. The filter layer setting can improve water flow capacity and effectively filter sediment.

[0056] S3: The drainage pipe 5 is installed. The drainage branch pipe 501 is inserted into the drainage hole 401 in the cast-in-place pile 4. The drainage branch pipe 501 is installed with a rubber water stop ring 405 at the pile top. The drainage pipe 5 is connected with the drainage branch pipe 501 and passes through the cap 9. The drainage pipe 5 and the drainage branch pipe 501 are all arranged below the bottom plate cushion layer. The drainage branch pipe 501 is connected to the drainage pipe 5. The drainage pipes 5 between the cast-in-place piles 4 are connected to each other and connected to the drainage ditch 6 and the water collection well 7.

[0057] S4: Construction of drainage ditch and water collection well: Wrap waterproof board 601 around and at the bottom of drainage ditch 6 and water collection well 7, make mortar protective layer, erect formwork, tie steel bars of drainage ditch 6 and water collection well 7, pour concrete, connect drainage pipe 5 to drainage ditch 6 and water collection well 7, connect drainage ditch 6 to water collection well 7, and waterproof the connection position of drainage pipe 5, water collection well 7 and drainage ditch 6 with waterproof glue 602;

[0058] S5: Construction of the block bottom plate, construction of waterproof board 601 above the bottom plate cushion layer, making a mortar protective layer, the structural joint 3 between adjacent block bottom plates 2 is set above the drainage ditch 6, the width of the structural joint 3 is not less than 20 mm, the steel bars of the block bottom plates 2 are tied separately, the steel bars between the block bottom plates 2 are not connected, the template is erected at the position of the structural joint 3, the concrete of the block bottom plates 2 is poured, and the strip cover 301 is laid on the structural joint 3;

[0059] S6: Drainage system installation, water pump 701 is installed in water collection well 7, steel manhole cover is installed on water collection well 7, basement and ground drainage pipes and drainage valves are installed, and connected to the municipal pipe network. Groundwater flows to the long drainage ditch 6, flows into the water collection well 7, and is discharged by water pump 701.

[0060] Specifically, the location and number of the drainage ditch 6 are determined by the stress on the segmented bottom plate 2 , with the principle of reducing the bending moment of the segmented bottom plate 2 , lowering the tensile stress of concrete and not providing a post-casting strip.

[0061] The structural seam 3 of the present application completely cuts the entire base plate into multiple sub-base plates 2. The steel bars between the sub-base plates 2 are not connected. Concrete is poured into each sub-base plate 2 separately, which can reduce the hydration heat of large-volume concrete pouring and eliminate temperature cracks.

[0062] To summarize, the block basement floor drainage structure and construction method of the present application divides the entire floor into several block floors by setting structural joints and drainage ditches. The block floors have the function of reducing the internal force of the entire floor and reducing the hydration heat of large-volume concrete pouring. The water buoyancy of the block floors is released through drainage ditches, so that the groundwater level is controlled below the block floors, eliminating the anti-floating piles or anchor rods of the basement and saving the construction period of the anti-floating piles or anchor rods, thereby reducing the project cost.

[0063] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in the field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A block basement floor drainage structure, characterized in that: include: A supporting structure, wherein the supporting structure encloses a basement space; A plurality of partitioned bottom plates arranged at intervals in a transverse direction, wherein the partitioned bottom plates are arranged at the bottom of the basement space, and a gap between two partitioned bottom plates adjacent in a transverse direction forms a structural seam; A plurality of cast-in-place piles are arranged below the block bottom plate and extend toward the stratum, and the cast-in-place piles are provided with axially penetrating drainage holes; A drainage pipe is arranged between the block bottom plate and the cast-in-place pile, and the drainage pipe is provided with a drainage branch pipe inserted into the drainage hole; The drainage ditch corresponds to the structural joint one by one and is arranged below the structural joint. The drainage pipe is connected to the drainage ditch and the water collection well. The drainage ditch is connected to the water collection well.

2. The block basement floor drainage structure according to claim 1 is characterized in that: The depth of the structural seam is the same as the thickness of the block bottom plate, the width of the structural seam is smaller than the width of the drainage ditch, a countersunk hole is provided at the upper end of the structural seam, a strip cover with the same length as the structural seam is installed in the countersunk hole, and the upper end surface of the strip cover is flush with the top surface of the block bottom plate.

3. The block basement floor drainage structure according to claim 1 is characterized in that: When the lower end of the cast-in-place pile is located in the soil layer or the sand layer, the bottom of the drainage hole is filled with a filter layer.

4. The block basement floor drainage structure according to claim 3 is characterized in that: A three-layer filter layer is arranged at the bottom of the drainage hole, which are a geotextile filter layer, a melon stone filter layer and a coarse sand filter layer from bottom to top.

5. The block basement floor drainage structure according to claim 1 is characterized in that: A water stop ring is installed at the connection between the drainage branch pipe and the drainage hole.

6. The block basement floor drainage structure according to claim 1 is characterized in that: The surroundings and bottom edges of the drainage ditch and the water collection well are wrapped with waterproof panels, and the connection between the drainage ditch and the drainage pipe, and the connection between the water collection well and the drainage pipe are sealed with waterproof glue.

7. The block basement floor drainage structure according to claim 1 is characterized in that: The cast-in-place piles are connected to the lower surface of the block bottom plate through a cap, the drainage pipe is a horizontal drainage pipe, the horizontal drainage pipe passes through the cap horizontally, the drainage branch pipe passes through the cap vertically, and the drainage pipes between the cast-in-place piles are connected to each other.

8. The block basement floor drainage structure according to claim 1 is characterized in that: A water pump is installed in the water collection well, and the water pump is connected to a drainage main pipe. The drainage main pipe extends to the ground, and a drainage valve is provided on the part of the drainage main pipe located on the ground; a well cover is installed on the water collection well.

9. The block basement floor drainage structure according to claim 1, characterized in that: The drainage hole is a pile core extraction detection hole or an ultrasonic detection tube pre-buried in the cast-in-place pile.

10. A construction method for a block basement floor drainage structure as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Construction of foundation pit support structure, excavation to the bottom, cutting of pile heads, pouring of bottom plate cushion; construction of drainage holes for cast-in-place piles using drilling rigs; S2: Installation of filter layer for drainage hole of cast-in-place pile. If the pile end of cast-in-place pile has entered the bedrock, there is no need to fill the drainage hole with sediment filter layer. If the pile end of cast-in-place pile has entered the soil layer or sand layer, fill the filter layer at the bottom of the drainage hole. S3: Drain pipe installation: insert drainage branch pipe into the drainage hole in the cast-in-place pile, the drainage branch pipe is connected to the drainage pipe, and the drainage pipes between the cast-in-place piles are connected to each other; S4: Construction of drainage ditch and water collection well, wrapping waterproof board around and at the bottom of drainage ditch and water collection well, making mortar protective layer, erecting formwork, tying up steel bars of drainage ditch and water collection well, pouring concrete, connecting drainage pipe to drainage ditch and water collection well, and connecting drainage ditch to water collection well; S5: Construction of block bottom plate, construction of waterproof board above the bottom plate cushion layer, making mortar protective layer, setting the structural joints between adjacent block bottom plates above the drainage ditch, tying the steel bars of the block bottom plates respectively, the steel bars between the block bottom plates are not connected, erecting formwork at the location of the structural joints, pouring the block bottom plate concrete, and laying strip covers on the structural joints; S6: Drainage system installation.

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