Drainage device for building construction site

Abstract

The invention discloses a drainage device for a building construction site, and relates to the technical field of building construction, the drainage device has the advantages of reinforcing a drainage ditch and reducing collapse of the side wall of the drainage ditch, and the key point of the technical scheme is that the drainage device comprises a foundation pit body and the drainage ditch formed around the bottom of the foundation pit body; reinforcing assemblies distributed in the length direction of the drainage ditches are arranged in the drainage ditches; upper and lower layers of water flow are formed in the drainage ditch through the reinforcing assembly; the water collecting well is arranged at the bottom of the foundation pit body and communicated with the drainage ditch, a drainage pipe is arranged in the water collecting well, and a drainage pump is arranged at the other end of the drainage pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a building construction site drainage device. BACKGROUND

[0002] With the rapid development of modern construction industry, high-rise and super high-rise buildings are increasing, and foundation pit excavation is needed during construction.

[0003] In order to ensure the stability of deep foundation pit, it is necessary to carry out dewatering of deep foundation pit. The commonly used dewatering method at present is open drainage of foundation pit, which is a drainage system composed of drainage ditch, water collecting well, water pipe and the like, and the surface water and seepage water are discharged out of the foundation pit.

[0004] However, in the prior art, the drainage ditch is directly excavated around the bottom of the foundation pit, and the drainage ditch is not reinforced, which can easily cause the side wall of the drainage ditch to collapse, thereby causing inconvenience in using the drainage ditch.

[0005] Therefore, the applicant has developed a new technical solution in the actual production process to solve the above technical problems. SUMMARY

[0006] In view of the above technical deficiencies, the purpose of the present application is to provide a building construction site drainage device, which has the advantages of reinforcing the drainage ditch and reducing the collapse of the side wall of the drainage ditch.

[0007] To solve the above technical problems, the present application adopts the following technical solutions: The present application provides a building construction site drainage device, which comprises a foundation pit body, a drainage ditch opened around the bottom of the foundation pit body, and a reinforcing assembly distributed along the length direction of the drainage ditch in the drainage ditch. The reinforcing assembly forms two layers of water flow in the drainage ditch. It also includes a water collecting well arranged at the bottom of the foundation pit body and communicating with the drainage ditch, a drainage pipe arranged in the water collecting well, and a drainage pump arranged at the other end of the drainage pipe.

[0008] By adopting the above technical solutions, the reinforcing assembly is installed in the drainage ditch excavated around the bottom of the foundation pit body to support the side wall of the drainage ditch and reduce the collapse of the side wall of the drainage ditch. The reinforcing assembly forms two layers of water flow in the drainage ditch, which facilitates the guidance of water flow above the foundation pit and in the foundation pit. The water flow in the drainage ditch flows into the water collecting well, and the water in the water collecting well is pumped out through the drainage pump and the drainage pipe, thereby facilitating the dewatering of the foundation pit.

[0009] Preferably, the reinforcing assembly comprises a plurality of reinforcing units arranged in the drainage ditch in sequence, the reinforcing unit comprises an L-shaped reinforcing plate, the vertical wall of the reinforcing plate is distributed close to the ditch wall of the drainage ditch and close to the side wall of the foundation body, the horizontal wall of the reinforcing plate is distributed along the ditch bottom of the drainage ditch and is in contact with the ditch bottom of the drainage ditch, the reinforcing plate is provided with an L-shaped water baffle, the length direction of the water baffle is along the length direction of the reinforcing plate, and the length direction of the reinforcing plate is distributed along the length direction of the drainage ditch. The horizontal wall of the water baffle is fixed on the vertical wall of the reinforcing plate, the vertical wall of the water baffle is distributed in parallel with the vertical wall of the reinforcing plate and is in contact with the ditch wall of the drainage ditch. There is a gap between the horizontal wall of the water baffle and the horizontal wall of the reinforcing plate.

[0010] Preferably, a plurality of supporting plates are arranged on the vertical wall of the reinforcing plate, the lower end of the horizontal wall of the water baffle is provided with a sliding groove for the horizontal sliding of the supporting plate, the sliding groove and the supporting plate are dovetail blocks and dovetail grooves matched with each other, and the vertical wall of the water baffle is flush with one end of the horizontal wall of the reinforcing plate.

[0011] Preferably, the upper ends of the vertical walls of the reinforcing plate and the water baffle are provided with relatively distributed embedding grooves, the upper ends of the reinforcing plate and the water baffle are connected with a water permeable plate through the embedding grooves, the length direction of the water permeable plate is distributed along the length direction of the reinforcing plate and the water baffle, and a plurality of waist-shaped holes are arranged on the water permeable plate.

[0012] Preferably, the length of the reinforcing plate and the water baffle is half of the length of the water permeable plate, and the upper end surface of the water permeable plate is flush with the upper end surfaces of the vertical walls of the reinforcing plate and the water baffle.

[0013] Preferably, the vertical wall of the reinforcing plate is provided with a flow distribution plate distributed along the length direction of the reinforcing plate, the flow distribution plate is provided with a flow distribution hole, the upper and lower ends of the flow distribution hole extend out of the upper and lower ends of the flow distribution plate respectively, the flow distribution hole is also distributed along the length direction of the flow distribution plate, the upper end of the flow distribution plate is distributed close to the upper end of the vertical wall of the reinforcing plate, and the lower end extends out of the lower side of the horizontal wall of the water baffle. At this time, the supporting plate is fixed on the plate surface of the flow distribution plate, and the horizontal wall of the water baffle is in contact with the flow distribution plate.

[0014] Preferably, the horizontal wall of the reinforcing plate and the horizontal wall of the water baffle are filled with a gravel layer, the gravel layer is wrapped with a net bag, and the net bag has a gap away from the vertical wall of the reinforcing plate.

[0015] Preferably, when the water level at the upper end of the horizontal wall of the water baffle is close to the water permeable plate, the water permeable plate is provided with a warning member.

[0016] Preferably, the waist-shaped holes on each of the water-permeable plates are provided with two rows, the warning member comprises a connecting rope arranged on the upper end surface of the water-permeable plate, two ends of the connecting rope are respectively provided with floating blocks penetrating into two corresponding waist-shaped holes of the two rows of waist-shaped holes, and the lower end of each floating block extends to the lower end of the water-permeable plate by a distance. When the floating blocks are not in contact with water, the connecting rope is in a straightened state, and the upper end of each floating block is located in the corresponding waist-shaped hole and is a waist-shaped plate matched with the gap of the waist-shaped hole.

[0017] Preferably, the sidewall of the foundation pit body is inclined upward from the bottom of the foundation pit body and extends upward away from the bottom of the foundation pit body, a water-blocking protection plate is arranged on the sidewall of the foundation pit body, and the lower end of the water-blocking protection plate extends to one side of the vertical wall of the reinforcing plate.

[0018] The beneficial effects of the present application are that the reinforcing assembly is installed in the drainage ditch dug around the bottom of the foundation pit body, the sidewall of the drainage ditch is supported, the sidewall collapse of the drainage ditch is reduced, the reinforcing assembly forms upper and lower water flows in the drainage ditch, the water flow above the foundation pit and in the foundation pit is guided, the water flow of the drainage ditch flows into the water collecting well, the water in the water collecting well is pumped out through the drainage pump and the drainage pipe, and then the dewatering in the foundation pit is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 It is a structural schematic view of the embodiment; Figure 2 It is a structural schematic view of the embodiment for embodying the foundation pit body; Figure 3 It is a structural schematic view of the embodiment for embodying the gravel layer; Figure 4 It is a structural schematic view of the embodiment for embodying the connection of two reinforcing units; Figure 5 It is a structural schematic view of the embodiment for embodying the flow dividing plate; Figure 6 It is a structural schematic view of the embodiment for embodying the warning member.

[0021] Explanation of reference signs: In the figure: 1, base pit body; 11, drainage ditch; 12, water collecting well; 13, reinforcing plate; 131, water baffle; 132, sliding groove; 133, embedding groove; 134, water permeable plate; 135, waist-shaped hole; 14, shunt plate; 141, shunt hole; 15, gravel layer; 16, connecting rope; 161, floating block. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0023] A building construction site drainage device, such as Figure 1 and Figure 2 , comprising a base pit body 1, a drainage ditch 11 opened around the bottom of the base pit body 1, and a reinforcing assembly arranged in the drainage ditch 11. The reinforcing assembly forms two layers of water flow in the drainage ditch 11. Further comprising a water collecting well 12 arranged at the bottom of the base pit body 1 and communicated with the drainage ditch 11, the drainage ditch 11 forms a rectangle, at this time, the water collecting well 12 is provided with two, which are distributed at opposite corner points of the rectangle distributed drainage ditch 11, a drainage pipe is arranged in the water collecting well 12, the other end of the drainage pipe is provided with a drainage pump (not shown in the figure), and the end of the drainage pipe away from the water collecting well 12 extends to outside of the base pit body 1.

[0024] As Figure 1 and Figure 2 , the reinforcing assembly is installed in the drainage ditch 11 dug around the bottom of the base pit body 1 to support the side wall of the drainage ditch 11, reduce the collapse of the side wall of the drainage ditch 11, and the reinforcing assembly forms two layers of water flow in the drainage ditch 11, which is convenient for guiding the water flow above the base pit and in the base pit, the water flow of the drainage ditch 11 flows into the water collecting well 12, the water in the water collecting well 12 is pumped out through the drainage pump and the drainage pipe, and then the dewatering in the base pit is facilitated.

[0025] As Figure 2 and Figure 4The reinforcing assembly comprises reinforcing units arranged in the drainage ditch 11 in sequence, and each reinforcing unit comprises an L-shaped reinforcing plate 13. The vertical wall of the reinforcing plate 13 is arranged in contact with the ditch wall of the drainage ditch 11 and close to the side wall of the foundation body 1. The horizontal wall of the reinforcing plate 13 is arranged along the ditch bottom of the drainage ditch 11 and in contact with the ditch bottom of the drainage ditch 11, i.e. the width of the horizontal wall of the reinforcing plate 13 is equal to the width of the drainage ditch 11. An L-shaped water baffle 131 is arranged on the reinforcing plate 13, and the length direction of the water baffle 131 is along the length direction of the reinforcing plate 13. The length direction of the reinforcing plate 13 is along the length direction of the drainage ditch 11. As Figure 2 and Figure 4 The horizontal wall of the water baffle 131 is fixed on the vertical wall of the reinforcing plate 13, and the vertical wall of the water baffle 131 is arranged in parallel with the vertical wall of the reinforcing plate 13 and in contact with the ditch wall of the drainage ditch 11. As Figure 2 and Figure 4 There is a gap between the horizontal wall of the water baffle 131 and the horizontal wall of the reinforcing plate 13, and the size of the gap is one fourth of the height of the vertical wall of the reinforcing plate 13.

[0026] As Figure 2 and Figure 4 At this time, the upper horizontal wall of the water baffle 131 forms an upper water flow layer, and the upper end surface of the horizontal wall of the reinforcing plate 13 forms a lower water flow layer. When the reinforcing assembly is installed, the drainage ditch 11 is first constructed to have a U-shaped longitudinal section with an opening facing upward, and one side ditch wall of the drainage ditch 11 is arranged close to the side wall of the foundation body 1. The ditch wall of the drainage ditch 11, which is arranged away from the side wall of the foundation body 1, is arranged to be inclined from the bottom of the drainage ditch 11 to be away from the drainage ditch 11, so as to facilitate the placement of the reinforcing assembly in the drainage ditch 11 and make the vertical wall of the reinforcing plate 13 in contact with the ditch wall of the drainage ditch 11 close to the side wall of the foundation body 1. Then, the drainage ditch 11 is backfilled to make the ditch wall of the drainage ditch 11 in contact with the vertical wall of the water baffle 131 and make part of the soil enter the gap between the horizontal wall of the water baffle 131 and the horizontal wall of the reinforcing plate 13. At this time, the soil layer exerts a compacting force on the reinforcing plate 13, so as to stabilize the positions of the reinforcing plate 13 and the water baffle 131.

[0027] As Figure 2 and Figure 4 The reinforcing assembly is a plurality of reinforcing units arranged in sequence and in contact with each other, i.e. the reinforcing plate 13 and the water baffle 131 are arranged in sequence and in contact with the reinforcing plate 13 and the water baffle 131 of the adjacent reinforcing unit. A sealing pad can be arranged between the adjacent reinforcing units and embedded on the side wall of the reinforcing plate 13 and the water baffle 131.

[0028] As Figure 2 and Figure 4The vertical wall of the reinforcing plate 13 is provided with a plurality of support plates, the lower end of the horizontal wall of the water baffle 131 is provided with a sliding groove 132 for the horizontal sliding of the support plates, the sliding groove 132 and the support plate are dovetail blocks and dovetail grooves matched with each other, and the vertical wall of the water baffle 131 is flush with one end of the horizontal wall of the reinforcing plate 13. At this time, the water baffle 131 and the reinforcing plate 13 are detachably connected, which is convenient for transportation and installation. The water baffle 131 is horizontally slid onto the support plate, and the horizontal wall of the water baffle 131 is abutted on the vertical wall of the reinforcing plate 13. At this time, the trench wall of the drainage ditch 11 is abutted on the vertical wall of the water baffle 131, thereby limiting the position of the water baffle 131. When the upper water flow layer passes between the vertical wall of the water baffle 131 and the reinforcing plate 13, the upper water flow layer provides extrusion force to the trench wall of the drainage ditch 11 through the vertical wall of the water baffle 131 and the reinforcing plate 13, thereby reducing the collapse of the side wall of the drainage ditch 11.

[0029] As Figure 2 and Figure 4 The upper end of the vertical wall of the reinforcing plate 13 and the water baffle 131 is provided with relatively distributed embedding grooves 133, and the upper end of the reinforcing plate 13 and the water baffle 131 is connected with a water permeable plate 134 through the embedding grooves 133. The length direction of the water permeable plate 134 is distributed along the length direction of the reinforcing plate 13 and the water baffle 131, and a plurality of waist-shaped holes 135 are provided on the water permeable plate 134.

[0030] As Figure 2 and Figure 4 The length of the reinforcing plate 13 and the water baffle 131 is half of the length of the water permeable plate 134, and the upper end surface of the water permeable plate 134 is flush with the upper end surface of the vertical wall of the reinforcing plate 13 and the water baffle 131.

[0031] As Figure 2 and Figure 4 The setting of the water permeable plate 134 reduces impurities in the upper water flow layer of the reinforcing assembly. When there is sludge accumulation on the upper end of the horizontal wall of the water baffle 131, the water permeable plate 134 is lifted upward through the waist-shaped hole 135, thereby cleaning the sludge on the upper end of the horizontal wall of the water baffle 131.

[0032] As Figure 5 and Figure 6 The water at the bottom and the side wall of the foundation pit body 1 is drained through the water permeable plate 134 into the upper end of the horizontal wall of the water baffle 131, which is the upper water flow layer. Most of the water in the foundation pit body 1 still flows to the water collector 12 through the upper water flow layer. When the water in the soil of the foundation pit body 1 flows to the gap between the horizontal wall of the water baffle 131 and the horizontal wall of the reinforcing plate 13, which is the lower water flow layer, the water flow is small, and the horizontal wall of the reinforcing plate 13 guides the water to the water collector 12.

[0033] As Figure 5 and Figure 6When the upper water flow layer water level increases, in order to guide the upper water flow to the lower water flow layer, therefore the vertical wall of the reinforcement plate 13 is provided with a distribution plate 14 distributed along the length direction of the reinforcement plate 13, the distribution plate 14 is provided with a distribution hole 141, the upper and lower ends of the distribution hole 141 extend out of the upper and lower ends of the distribution plate 14 respectively, the distribution hole 141 is also distributed along the length direction of the distribution plate 14, the upper end of the distribution plate 14 is distributed close to the upper end of the vertical wall of the reinforcement plate 13, and the lower end extends below the horizontal wall of the water retaining plate 131; As Figure 5 And Figure 6 At this time, the support plate is fixed on the plate surface of the distribution plate 14, and the horizontal wall of the water retaining plate 131 abuts on the distribution plate 14.

[0034] As Figure 3 And Figure 5 When the water level of the upper end of the horizontal wall of the water retaining plate 131 increases to the height of the upper end of the distribution plate 14, the upper water flow flows to the lower side of the horizontal wall of the water retaining plate 131 through the distribution hole 141 in the distribution plate 14 for drainage, and then flows to the water collecting well 12.

[0035] As Figure 6 And Figure 5 The horizontal wall of the reinforcement plate 13 and the horizontal wall of the water retaining plate 131 are filled with a gravel layer 15, the gravel layer 15 is wrapped with a mesh bag, and there is a gap between the mesh bag and the end of the horizontal wall of the reinforcement plate 13 away from the vertical wall, the purpose of this design is that the gravel layer 15 is a filter layer to reduce impurities in the water directly seeping from the foundation pit soil layer, and the gap is arranged to facilitate the wall of the drainage ditch 11 entering the gap.

[0036] As Figure 6 When the water level of the upper end of the horizontal wall of the water retaining plate 131 approaches the water permeable plate 134, the water permeable plate 134 is provided with a warning member. If the warning members on other water permeable plates 134 are not warning, and only the warning members on several water permeable plates 134 are working, at this time, the warning members serve to remind workers that there is a possibility of blockage in the reinforcement unit at this place, and the water permeable plate 134 needs to be opened for cleaning.

[0037] As Figure 6 And Figure 6 The waist-shaped hole 135 on each water permeable plate 134 is provided with two rows, the warning member includes a connecting rope 16 located on the upper surface of the water permeable plate 134, the two ends of the connecting rope 16 are respectively provided with a floating block 161 penetrating into two corresponding waist-shaped holes 135 of the two rows of waist-shaped holes 135, and the lower end of each floating block 161 extends to the lower end of the water permeable plate 134 by a distance; As Figure 6 When the floating block 161 is not in contact with water, the connecting rope 16 is in a straightened state, and the upper end of each floating block 161 is located in the corresponding waist-shaped hole 135 and is a waist-shaped plate in gap cooperation with the waist-shaped hole 135.

[0038] As ​ When the water level at the upper end of the horizontal wall of the water baffle 131 rises to near the water-permeable plate 134, the floating block 161 is pushed upward, and the upper end of the floating block 161 is moved out of the waist-shaped hole 135, thereby reminding the workers that the water level at this position is high, and it is necessary to observe and clean up. When the water level at the upper end of the horizontal wall of the water baffle 131 rises to the lower end surface of the water-permeable plate 134, the lower end of the floating block 161 is located in the waist-shaped hole 135.

[0039] The side wall of the foundation pit body 1 is inclined upward from the bottom of the foundation pit body 1, and extends upward and away from the bottom of the foundation pit body 1. A water-retaining protection plate is arranged on the side wall of the foundation pit body 1, and the lower end of the water-retaining protection plate extends to one side of the vertical wall of the reinforcing plate 13. The water-retaining protection plate is a flexible grid net plate, and a plurality of long strip-shaped flexible water guide strips are arranged on the side of the net plate away from the side wall of the foundation pit body 1. The length direction of the water guide strips is along the side wall of the foundation pit body 1, so as to guide the water seeping from the side wall of the foundation pit body 1 to the water-permeable plate 134. When there is water on the side wall of the foundation pit body 1, the water flows along the water-retaining protection plate to the reinforcing plate 13, and then enters the water-permeable plate 134 (not shown in the figure).

[0040] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Therefore, the present application intends to include all such modifications and changes as fall within the scope of the claims and their equivalents.

Claims

1. A drainage device for a construction site, characterized in that: It comprises a foundation pit body (1), and drainage ditches (11) arranged around the bottom of the foundation pit body (1), wherein the drainage ditches (11) are provided with reinforcement components distributed along the length direction of the drainage ditches (11); The reinforcement assembly enables the formation of upper and lower water flows in the drainage ditch (11); It also includes a water collection well (12) arranged at the bottom of the foundation pit body (1) and connected to the drainage ditch (11); a drainage pipe is arranged in the water collection well (12); and a drainage pump is arranged at the other end of the drainage pipe.

2. A construction site drainage device according to claim 1, characterized in that: The reinforcement assembly includes a plurality of reinforcement units sequentially arranged in the drainage ditch (11), the reinforcement unit including an L-shaped reinforcement plate (13), the vertical wall of the reinforcement plate (13) is arranged in contact with the wall of the drainage ditch (11) and close to the side wall of the foundation pit body (1), the horizontal wall of the reinforcement plate (13) is arranged along the bottom of the drainage ditch (11) and contacts the bottom of the drainage ditch (11), an L-shaped water retaining plate (131) is provided on the reinforcement plate (13), the length direction of the water retaining plate (131) is along the length direction of the reinforcement plate (13), and the length direction of the reinforcement plate (13) is distributed along the length direction of the drainage ditch (11); The horizontal wall of the water retaining plate (131) is fixed on the vertical wall of the reinforcement plate (13), the vertical wall of the water retaining plate (131) is parallel to the vertical wall of the reinforcement plate (13), and is in contact with the wall of the drainage ditch (11); There is a gap between the horizontal wall of the water retaining plate (131) and the horizontal wall of the reinforcing plate (13).

3. A construction site drainage device as claimed in claim 2, characterized in that: A plurality of support plates are provided on the vertical wall of the reinforcing plate (13); a chute (132) for the support plates to slide into horizontally is provided at the lower end of the horizontal wall of the water retaining plate (131); the chute (132) and the support plate are mutually matched dovetail blocks and dovetail grooves; the vertical wall of the water retaining plate (131) is flush with one end of the horizontal wall of the reinforcing plate (13).

4. A construction site drainage device as claimed in claim 3, characterized in that: The upper ends of the vertical walls of the reinforcing plate (13) and the water baffle (131) are provided with relatively distributed embedding grooves (133), and the upper ends of the reinforcing plate (13) and the water baffle (131) are connected to a water-permeable plate (134) through the embedding grooves (133). The length direction of the water-permeable plate (134) is distributed along the length direction of the reinforcing plate (13) and the water baffle (131), and a plurality of waist-shaped holes (135) are provided on the water-permeable plate (134).

5. A construction site drainage device as claimed in claim 4, characterized in that: The lengths of the reinforcing plate (13) and the water retaining plate (131) are half the length of the water permeable plate (134), and the upper end surface of the water permeable plate (134) is flush with the upper end surfaces of the vertical walls of the reinforcing plate (13) and the vertical walls of the water retaining plate (131).

6. A construction site drainage device as claimed in claim 3, characterized in that: A diverter plate (14) is provided on the vertical wall of the reinforcing plate (13) and is distributed along the length direction of the reinforcing plate (13). A diverter hole (141) is provided on the diverter plate (14). The upper and lower ends of the diverter hole (141) extend from the upper and lower ends of the diverter plate (14) respectively. The diverter holes (141) are also distributed along the length direction of the diverter plate (14). The upper end of the diverter plate (14) is close to the upper end of the vertical wall of the reinforcing plate (13), and the lower end extends below the horizontal wall of the water retaining plate (131). At this time, the support plate is fixed on the plate surface of the diverter plate (14), and the horizontal wall of the water retaining plate (131) abuts against the diverter plate (14).

7. A construction site drainage device according to claim 6, characterized in that: A crushed stone layer (15) is filled between the horizontal wall of the reinforcing plate (13) and the horizontal wall of the water retaining plate (131), and the crushed stone layer (15) is covered with a mesh bag. A gap exists between the mesh bag and the end of the horizontal wall of the reinforcing plate (13) away from the vertical wall.

8. A construction site drainage device as claimed in claim 5, characterized in that: When the water level at the upper end of the horizontal wall of the water retaining plate (131) approaches the water permeable plate (134), a warning member is provided on the water permeable plate (134).

9. A construction site drainage device according to claim 8, characterized in that: Each of the water-permeable plates (134) has two rows of waist-shaped holes (135), and the warning member includes a connecting rope (16) located on the upper end surface of the water-permeable plate (134). Both ends of the connecting rope (16) are provided with floating blocks (161) that penetrate into two corresponding waist-shaped holes (135) in the two rows of waist-shaped holes (135), and the lower end of each floating block (161) extends to a distance from the lower end of the water-permeable plate (134); When the floating blocks (161) are not in contact with water, the connecting rope (16) is in a straightened state, and the upper end of each floating block (161) is located in the corresponding waist-shaped hole (135), and is a waist-shaped plate that is gap-matched with the waist-shaped hole (135).

10. A construction site drainage device according to claim 1, characterized in that: The side walls of the foundation pit body (1) are distributed obliquely upward from the bottom of the foundation pit body (1) and extend obliquely upward in a direction away from the bottom of the foundation pit body (1). A water retaining protective plate is laid on the side walls of the foundation pit body (1), and the lower end of the water retaining protective plate extends to one side of the vertical wall of the reinforcement plate (13).

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