Dewatering well structure and construction method thereof

Abstract

The invention relates to the field of assembly type stations, in particular to a dewatering well structure and a construction method thereof. The interior is hollow to form a liquid storage inner cavity; an erecting mechanism is arranged in the well body; the erecting mechanism comprises a bottom sealing tray arranged in the liquid storage inner cavity; a water outlet embedded pipe and a grouting embedded pipe are arranged on the bottom sealing tray; the liquid storage inner cavity is in an inverted frustum shape; the bottom sealing tray is also in a frustum shape; according to the dewatering well structure disclosed by the invention, the bottom sealing tray is arranged, so that the water outlet embedded pipe and the grouting embedded pipe are conveniently laid and placed in the well body; and meanwhile, the liquid storage inner cavity and the bottom sealing tray are required to be arranged in a frustum shape, connection between the bottom sealing tray and the well body is facilitated, the bottom sealing tray can be in interference fit with the well body in a specific area in the well body, and therefore the stability of connection between the bottom sealing tray and the well body is well guaranteed.

Description

Technical Field

[0001] The invention relates to the field of assembled stations, and in particular to a precipitation well structure and a construction method thereof. Background Art

[0002] In today's world, with the rapid growth of urbanization, prefabricated buildings, as a new type of construction method, are diverse and forward-looking in the construction field.

[0003] Although my country's subway prefabricated technology started late, it has developed rapidly. The fully prefabricated structure puts forward higher requirements on the foundation pit base.

[0004] During actual construction, in order to meet the installation quality of all prefabricated components and reduce leakage of underground structures; at the same time, in order to ensure the smooth installation of prefabricated components and water-free operation of the base during the construction phase, dewatering wells are set up in the foundation pit of the prefabricated structure during the excavation stage to carry out dewatering in the pit.

[0005] The traditional prefabricated structure base adopts an arc-shaped structure, and the precipitation is set in the straight sections on both sides instead of at the lowest point of the excavation section; however, such a setting position is difficult to meet the prefabricated precipitation requirements, resulting in low prefabricated construction efficiency and complex installation of the traditional precipitation well structure.

[0006] In addition, in the actual construction of traditional dewatering wells, it is generally required to excavate a layer of foundation pit and cut off a section of the well body. This not only makes it difficult to control the cutting size of the well body, but also affects the construction efficiency of the foundation pit excavation and the dewatering well structure.

[0007] In addition, although the existing foundation pit dewatering well has a certain drainage function, it is inconvenient to place the water pump and other pipeline structures in the well body.

[0008] In order to place the pipeline and the water pump in the well body, a bracket is generally welded to the wall of the well body. However, for some precipitation wells with a deep layout and a small inner diameter of the well body, it is inconvenient to install the bracket on the well body.

[0009] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing foundation pit dewatering well structure.

[0010] The existing patent 201710746793.5 - A high-pressure dewatering well structure and hydrostatic grouting sealing method in a subway station foundation pit does not clearly disclose the technical content for solving the above-mentioned technical problems. Summary of the invention

[0011] The purpose of the present invention is to provide a dewatering well structure in which the internal components of the well body are conveniently placed in the well body.

[0012] In order to achieve the above object, the technical solution adopted by the present invention is:

[0013] A precipitation well structure, comprising a well body; the interior of the well body is hollow to form a liquid storage cavity; a mounting mechanism is provided in the well body;

[0014] The erection mechanism comprises a bottom tray arranged in the liquid storage cavity; the bottom tray is provided with a water outlet pre-buried pipe and a grouting pre-buried pipe;

[0015] The liquid storage cavity is in the shape of an inverted cone; the bottom cover tray is also in the shape of a cone.

[0016] A supporting and protective layer is provided on the top of the well body, and the supporting and protective layer comprises a wire mesh layer; the supporting and protective layer cover is arranged on the well body.

[0017] The side of the well body is provided with connecting holes; the water outlet pre-buried pipe and the grouting pre-buried pipe are led out of the well body through the corresponding connecting holes.

[0018] A plugging layer is provided in the well body, and the plugging layer includes a backfill soil layer and a grouting plugging layer; the backfill soil layer and the grouting plugging layer are distributed on both sides of the bottom tray; a backfill soil layer is provided above the bottom tray; and a grouting plugging layer is provided below the bottom tray.

[0019] A construction method of the precipitation well structure, the construction method comprising the following steps:

[0020] Step 1: Construction of foundation pit enclosure;

[0021] Step 2: construct the well body in the dewatering well structure and excavate the foundation pit;

[0022] Step 3: After step 2 is completed, the well body in the precipitation well structure is cut off, and the water outlet pre-buried pipe and the grouting pre-buried pipe are arranged; then the backfill soil layer is backfilled;

[0023] Step 4: After step 3 is completed, assemble the prefabricated station;

[0024] Step 5: After completing step 4, the grouting plugging layer is constructed to achieve grouting plugging of the lower space of the well body.

[0025] In the step 2, before the foundation pit is excavated and formed, the well body is not cut off.

[0026] In step 3, it is required that after the well body is cut off, the upper edge of the well body is higher than the bottom surface of the foundation pit and lower than the upper edge of the fine-leveling strip in the prefabricated station.

[0027] The precipitation well structure is staggered with the fine-leveling strips in the prefabricated station.

[0028] In the step 2, the dewatering well structure is required to be arranged at the position where the amount of water collected in the foundation pit area is the largest.

[0029] In the step 3, the grouting pre-buried pipe and the pumping pre-buried pipe pass through the corresponding connecting holes on the side of the well body and extend to the ground along the groove on the side wall of the foundation pit; an avoidance arc groove is provided on the fine-leveling strip arranged above the grouting pre-buried pipe and the pumping pre-buried pipe in the prefabricated station; the avoidance arc groove is arranged on the side of the corresponding fine-leveling strip close to the bottom surface of the foundation pit.

[0030] The advantages of the present invention are:

[0031] The invention discloses a precipitation well structure and a construction method thereof.

[0032] The precipitation well structure disclosed by the present invention facilitates the laying and placement of the water outlet pre-buried pipe and the grouting pre-buried pipe in the well body by providing a bottom sealing tray.

[0033] At the same time, the present invention requires that the liquid storage cavity and the bottom tray are both arranged in a frustum shape, which facilitates the connection between the bottom tray and the well body. The bottom tray of the present invention can have an interference fit with the well body in a specific area of ​​the well body, thereby well ensuring the stability of the connection between the bottom tray and the well body.

[0034] In addition, based on the above design, the present invention can simplify the connection between the bottom cover tray and the well body, so as to facilitate the installation and fixation of the bottom cover tray in the well body during subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0036] Figure 1 It is a structural schematic diagram of the precipitation well structure in the present invention.

[0037] Figure 2 It is a schematic diagram of the structure of the bottom cover tray when it is placed in the well body in the present invention.

[0038] Figure 3 It is a structural schematic diagram of the dewatering well structure of the present invention when arranged in a foundation pit.

[0039] The marks in the above figure are:

[0040] 1. Foundation pit, 2. Prefabricated station, 3. Dewatering well structure, 4. Foundation pit support. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0042] A precipitation well structure 3 includes a well body 31; the interior is hollow to form a liquid storage cavity 32; a mounting mechanism is provided in the well body 31; the mounting mechanism includes a bottom tray 36 arranged in the liquid storage cavity 32; a water outlet pre-buried pipe 35 and a grouting pre-buried pipe 34 are provided on the bottom tray 36; the liquid storage cavity 32 is in an inverted cone shape; the bottom tray 36 is also in a cone shape.

[0043] The precipitation well structure 3 disclosed in the present invention facilitates the laying and placement of the water outlet pre-buried pipe 35 and the grouting pre-buried pipe 34 in the well body 31 by providing the bottom sealing tray 36 .

[0044] At the same time, the present invention requires that the liquid storage cavity 32 and the bottom tray 36 are both configured in a conical shape, which facilitates the connection between the bottom tray 36 and the well body 31. The bottom tray 36 of the present invention can be interference fit with the well body 31 in a specific area within the well body 31, thereby well ensuring the stability of the connection between the bottom tray 36 and the well body 31.

[0045] In addition, based on the above design, the present invention can simplify the connection between the bottom tray 36 and the well body 31, so as to facilitate the installation and fixation of the bottom tray 36 in the well body 31 during subsequent use.

[0046] Specifically, the drainage well structure 3 disclosed in the present invention mainly includes a well body 31; a water pump 33 is arranged in the well body 31, which is convenient for converging the water in the foundation pit 1 to facilitate subsequent external discharge operations when used later.

[0047] It is convenient for the subsequent construction of the prefabricated station 2 to create a waterless environment and improve the efficiency of prefabricated construction, avoiding the quality problems of prefabricated component splicing and floating of the assembled structure caused by insufficient groundwater precipitation during construction.

[0048] The internal hollow space described in the present invention forms a liquid storage cavity 32, which facilitates the convergence of water in the well body 31. In addition, a mounting mechanism is provided in the well body 31 of the present invention. The setting of the mounting mechanism facilitates the placement and arrangement of the water outlet pre-buried pipe 35 and the grouting pre-buried pipe 34 in the well body 31 during subsequent use, and also facilitates the lifting of the water pump 33 in the well body 31 during subsequent use.

[0049] Specifically, the erection mechanism described in the present invention includes a bottom tray 36 arranged in the liquid storage cavity 32; the bottom tray 36 is provided with a water outlet pre-buried pipe 35 and a grouting pre-buried pipe 34; the bottom tray 36 acts as a support member and a connecting member, one function of which is to facilitate the installation and arrangement of components such as the water outlet pre-buried pipe 35 and the grouting pre-buried pipe 34 in the well body 31, and the bottom tray 36 also plays a good supporting role, which is convenient for supporting the backfill soil layer 37 and facilitating the backfilling operation of the backfill soil layer 37 on the upper part of the well body 31.

[0050] At the same time, in the present invention, the liquid storage cavity 32 is in the shape of an inverted cone; the bottom tray 36 is also in the shape of a cone; the present invention designs the liquid storage cavity 32 into a structure with a large upper end and a small lower end, which facilitates the placement of the bottom tray 36 in the well body 31. At the same time, under the subsequent squeezing of the backfill soil layer 37, the stability of the connection between the bottom tray 36 and the well body 31 can be better guaranteed.

[0051] Furthermore, in the present invention, a supporting protective layer 38 is provided on the top of the well body 31, and the supporting protective layer 38 includes a wire mesh layer; the supporting protective layer 38 is covered on the well body 31; the supporting protective layer 38 acts as a cover structure; the top of the well body 31 can be sealed, and at the same time, it plays a limiting role to prevent the well body 31 from sinking.

[0052] In the present invention, the wire mesh layer acts as a skeleton structure. In the present invention, the supporting protective layer is a reinforced concrete structure or a steel cover plate structure. The wire mesh layer acts as a supporting skeleton in the reinforced concrete to ensure the structural strength of the supporting protective layer.

[0053] Furthermore, in the present invention, the side of the well body 31 is provided with connecting holes; the water outlet pre-buried pipe 35 and the grouting pre-buried pipe 34 are led out of the well body 31 through the corresponding connecting holes; the setting of the connecting holes facilitates the subsequent arrangement of the water outlet pre-buried pipe 35 and the grouting pre-buried pipe 34 through the well body 31.

[0054] Furthermore, in the present invention, a sealing layer is provided in the well body 31. The setting of the sealing layer can fill the well body 31 to achieve the filling and sealing operation of the well body 31, thereby avoiding the hollowness of the interior of the precipitation well after the construction of the prefabricated station 2 is completed.

[0055] In the present invention, the blocking layer includes a backfill soil layer 37 and a grouting blocking layer; the backfill soil layer 37 and the grouting blocking layer are distributed on both sides of the bottom tray 36; a backfill soil layer 37 is provided above the bottom tray 36; a grouting blocking layer is provided below the bottom tray 36; the grouting blocking layer of the present invention can realize grouting blocking of the lower part of the well body 31 through the outside after the assembly of the prefabricated station 2 is completed; and the backfill soil layer 37 is mainly used for the upper filling operation of the well body 31. The present invention uses the backfill soil layer 37 to perform the blocking operation on the upper part of the well body 31, which can not only reduce the backfill cost, but also reduce the trouble of pouring and filling in the well body 31; and can improve the blocking efficiency and reduce the working hours of batching.

[0056] A construction method of the precipitation well structure 3, the construction method comprising the following steps:

[0057] Step 1: Construction of foundation pit enclosure 4;

[0058] Step 2: construct the well body 31 in the dewatering well structure 3 and excavate the foundation pit 1;

[0059] Step 3: After step 2 is completed, the well body 31 in the precipitation well structure 3 is cut off, and the water outlet pre-buried pipe 35 and the grouting pre-buried pipe 34 are arranged; then the backfill soil layer 37 is backfilled;

[0060] Step 4: After step 3 is completed, assemble the prefabricated station 2;

[0061] Step 5: After step 4 is completed, the grouting plugging layer is constructed to achieve grouting plugging of the lower space of the well body 31.

[0062] The present invention can realize the construction operation of the precipitation well structure 3 through the disclosure of the above-mentioned construction method.

[0063] The above-mentioned construction method of the present invention can not only facilitate the construction operation of the dewatering well structure 3, but also ensure the construction efficiency of the dewatering well structure 3; the present invention can provide conditions for the assembly of the prefabricated station 2 through the dewatering well structure 3. When the dewatering well disclosed by the present invention is used normally, it can normally drain and dewater the bottom of the foundation pit 1, meet the waterless environment required for the assembly construction of the prefabricated station 2 in the foundation pit 1 and the safety requirements of the station anti-floating during construction; reduce the leakage risk of the prefabricated station 2, and at the same time, increase the construction efficiency, save costs, and ensure reliable construction quality.

[0064] After the assembled station 2 is completed, a grouting sealing layer is poured into the well body 31 to achieve filling and sealing in the well body 31, thereby achieving permanent sealing of the precipitation well.

[0065] Furthermore, in step 2 described in the present invention, the well body 31 is not cut before the foundation pit 1 is excavated and formed; this can reduce the amount of earth particles that enter the well body 31 when the foundation pit 1 is excavated; at the same time, it can avoid the operation of cutting off the upper part of the well pipe of the drainage well section by section when the foundation pit 1 is excavated in layers during traditional construction. In other words, the well body 31 can be cut without being cut when the foundation pit 1 is excavated, thereby reducing the wasted time for cutting the well body 31.

[0066] Furthermore, in step 3 described in the present invention, it is required that after the well body 31 is cut off, the upper edge of the well body 31 is higher than the bottom surface of the foundation pit 1 and lower than the upper edge of the fine-leveling strip in the prefabricated station 2; based on such a setting, the risk of mud blocks on the bottom surface of the foundation pit 1 entering the well body 31 can be reduced; at the same time, it is avoided that the well body 31 protrudes too much and affects the subsequent calibration and positioning of the fine-leveling strip.

[0067] Furthermore, the dewatering well structure 3 described in the present invention is staggered with the fine-leveling strips in the prefabricated station 2; through such an arrangement, the present invention can avoid installation interference between the dewatering well structure 3 and the fine-leveling strips. Based on the above, it can be known that the present invention requires that the well body 31 in the dewatering well structure 3 is protruding on the bottom surface of the foundation pit 1. If the dewatering well structure 3 is below the fine-leveling strip, it will interfere with the installation of the fine-leveling strip.

[0068] In actual arrangement, the drainage well structure 3 disclosed in the present invention is arranged between adjacent fine-leveling strips. Generally, in order to facilitate the arrangement of subsequent pipelines, it is generally required that the drainage well structure 3 be arranged around the fine-leveling strip close to the side of the foundation pit 1.

[0069] Furthermore, in step 2 of the present invention, the dewatering well structure 3 is required to be arranged at the position where the amount of water collected in the foundation pit 1 area is the largest; this can better discharge the water in the foundation pit 1 and optimize the use effect of the dewatering well structure 3.

[0070] Furthermore, in step 3 described in the present invention, the grouting pre-buried pipe 34 and the pumping pre-buried pipe pass through the corresponding connecting holes on the side of the well body 31, and extend to the ground along the groove on the side wall of the foundation pit 1; based on such a setting, the present invention facilitates the pumping operation in the dewatering well during the subsequent assembly of the prefabricated station 2, and the setting of the grouting pre-buried pipe 34 facilitates the grouting operation into the well body 31 after the subsequent assembly of the prefabricated station 2 is completed, thereby realizing the sealing operation at the lower end of the well body 31.

[0071] In addition, in the prefabricated station 2 described in the present invention, an avoidance arc groove is provided on the fine-leveling strip arranged above the grouting pre-buried pipe 34 and the pumping pre-buried pipe; the avoidance arc groove is arranged on the side of the corresponding fine-leveling strip close to the bottom surface of the foundation pit 1; based on such an arrangement, the present invention can avoid installation interference between the fine-leveling strip and the grouting pre-buried pipe 34 and the pumping pre-buried pipe.

[0072] specific:

[0073] When constructing the foundation pit 1 of the prefabricated station 2, the support of the foundation pit 1 adopts the support form of setting up underground continuous wall support and three internal supports. The soil in the foundation pit 1 is drained by using the in-pit dewatering well, which provides a waterless working environment for the excavation of the foundation pit 1 and the assembly of the prefabricated station 2, and at the same time can meet the anti-floating safety requirements of the subway station structure.

[0074] The dewatering well structure 3 disclosed in the present invention is arranged at the bottom of the foundation pit 1 and is located between two adjacent fine-leveling strips of the prefabricated station 2, and mainly includes a well body 31; the well body 31 is driven into the foundation pit 1 area before the foundation pit 1 is excavated; in the early stage, a water pump is mainly used in conjunction with a pipeline to realize the pumping of water in the well body 31. After the excavation of the foundation pit 1 is completed, the well body 31 is cut off, and a set length is reserved, and then the corresponding pipeline is laid on the well body 31. After the laying is completed, the backfill soil layer 37 is backfilled; after the backfilling is completed, a supporting protective layer 38 is installed on the upper part of the well body 31 for protection; and then the prefabricated station 2 is assembled. After the prefabricated station 2 is assembled, the lower cavity of the well body 31 is grouting and plugging operation is performed through the grouting pre-buried pipe 34; after the plugging is completed, the prefabricated station 2 is covered with soil, the grouting port and the prefabricated station 2 are covered, and the overall ground paving is completed.

[0075] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A precipitation well structure, characterized in that: It comprises a well body; the interior is hollow to form a liquid storage cavity; a mounting mechanism is provided in the well body; The erection mechanism comprises a bottom tray arranged in the liquid storage cavity; the bottom tray is provided with a water outlet pre-buried pipe and a grouting pre-buried pipe; The liquid storage cavity is in the shape of an inverted cone; the bottom cover tray is also in the shape of a cone.

2. A precipitation well structure according to claim 1, characterized in that: A supporting and protective layer is provided on the top of the well body, and the supporting and protective layer comprises a wire mesh layer; the supporting and protective layer cover is arranged on the well body.

3. A precipitation well structure according to claim 1, characterized in that: The side of the well body is provided with connecting holes; the water outlet pre-buried pipe and the grouting pre-buried pipe are led out of the well body through the corresponding connecting holes.

4. A precipitation well structure according to claim 1, characterized in that: A plugging layer is provided in the well body, and the plugging layer includes a backfill soil layer and a grouting plugging layer; the backfill soil layer and the grouting plugging layer are distributed on both sides of the bottom tray; a backfill soil layer is provided above the bottom tray; and a grouting plugging layer is provided below the bottom tray.

5. A construction method of a precipitation well structure according to any one of claims 1 to 4, characterized in that: The construction method comprises the following steps: Step 1: Construction of foundation pit enclosure; Step 2: construct the well body in the dewatering well structure and excavate the foundation pit; Step 3: After step 2 is completed, the well body in the precipitation well structure is cut off, and the water outlet pre-buried pipe and the grouting pre-buried pipe are arranged; then the backfill soil layer is backfilled; Step 4: After step 3 is completed, assemble the prefabricated station; Step 5: After completing step 4, the grouting plugging layer is constructed to achieve grouting plugging of the lower space of the well body.

6. The construction method of a precipitation well structure according to claim 5, characterized in that: In the step 2, before the foundation pit is excavated and formed, the well body is not cut off.

7. The construction method of a precipitation well structure according to claim 5, characterized in that: In the step 3, it is required that after the well body is cut off, the upper edge of the well body is higher than the bottom surface of the foundation pit and lower than the upper edge of the fine-leveling strip in the prefabricated station.

8. The construction method of a precipitation well structure according to claim 5, characterized in that: The precipitation well structure is staggered with the fine-leveling strips in the prefabricated station.

9. The construction method of a precipitation well structure according to claim 5, characterized in that: In step 2, the dewatering well structure is required to be arranged at the position where the amount of water collected in the foundation pit area is the largest.

10. The construction method of a precipitation well structure according to claim 5, characterized in that: In the step 3, the grouting pre-buried pipe and the pumping pre-buried pipe pass through the corresponding connecting holes on the side of the well body and extend to the ground along the groove on the side wall of the foundation pit; an avoidance arc groove is provided on the fine-leveling strip arranged above the grouting pre-buried pipe and the pumping pre-buried pipe in the prefabricated station; the avoidance arc groove is arranged on the side of the corresponding fine-leveling strip close to the bottom surface of the foundation pit.

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