A detachable closed precipitation well

Abstract

The present invention provides a detachable closed precipitation well cover, which is provided with a circular upper well cover and an annular lower well cover, the lower well cover is fixed directly below the upper well cover by a connecting mechanism and the outer diameters of the two are equal; the upper well cover is composed of two semicircular upper semicircular covers, the centers of the two upper semicircular covers are provided with concave semicircular grooves, the two upper semicircular covers are connected together by ingot nuts and bolts and a circular hole is formed in the middle, the circular hole is provided with a rubber sealing plug, and the rubber sealing plug is provided with a water outlet / air exhaust hole; the lower well cover is composed of two semicircular lower semicircular ring covers, the two lower semicircular ring covers are connected together by limiting screw holes; the inner walls of the lower surfaces of the upper well cover and the lower well cover are provided with rubber water stop rings; a water outlet / air exhaust pipe is vertically inserted in the circular through hole in the center of the upper well cover. The present invention has the advantages of simple equipment, easy operation, saving manpower, etc., and has good sealing effect, high pressure resistance, and can be effectively reused.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater control and dewatering in foundation pit engineering, and in particular relates to a detachable and sealed manhole cover suitable for a dewatering well. Background Art

[0002] During the construction of pressure relief wells, the dynamic water gravel filling stage, the vacuum pumping stage during the operation of dewatering wells, and the pressurization stage during the recharge operation of recharge wells, the wellhead needs to be sealed to ensure the airtightness of the well in order to achieve the expected effect.

[0003] The traditional technology is to connect the manhole cover to the well pipe by welding, which is not only time-consuming and labor-intensive, but also requires high welding skills of the operators. Once the welding is poor, the sealing effect of the manhole cover is poor. When the water is filled with gravel, the water in the well will spray out under the pressure of the booster pump, and cannot pass through the filter pipe to enter the annular gap between the well pipe and the well wall and return from the wellhead; during pressurized recharge, the poor sealing of the manhole cover will cause the recharge pressure to be unable to increase, and the requirements of pressurized recharge cannot be met; when using super pressure suction combined pumping technology for drainage, the poor sealing effect of the manhole cover will also lead to insufficient vacuum in the well during vacuum pumping, low pumping efficiency, and poor drainage effect.

[0004] If welding is used to connect the well pipe and manhole cover, the disassembly is more complicated and often requires the use of a cutting machine for cutting. The disassembly efficiency is low, and the manhole cover is easily damaged during the disassembly process, making it difficult to effectively reuse. Summary of the invention

[0005] The purpose of the present invention is to provide a new type of detachable and closed drainage manhole cover based on the above-mentioned deficiencies of the prior art, so as to ensure the sealing effect of the manhole cover, effectively reuse it, save installation time, and reduce labor costs and skill requirements.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] A detachable closed precipitation well cover, the detachable closed precipitation well cover is provided with a circular upper well cover and an annular lower well cover, the lower well cover is fixed directly below the upper well cover through a connecting mechanism, and the outer diameters of the two are the same;

[0008] The upper manhole cover is composed of two semicircular upper semicircular covers, the centers of the two upper semicircular covers are provided with concave semicircular grooves, the two upper semicircular covers are connected together by ingot nuts and bolts and a circular hole is formed in the middle, the circular hole is provided with a rubber sealing plug, and the rubber sealing plug is provided with a water outlet / air exhaust hole;

[0009] The manhole cover is composed of two lower semicircular ring covers, and the two lower semicircular ring covers are connected together through limiting screw holes;

[0010] The lower surface of the upper manhole cover 1 and the inner diameter of the lower manhole cover are both provided with rubber water stop rings;

[0011] A water outlet / exhaust pipe is vertically inserted into the circular through hole in the center of the upper manhole cover, the upper end of the water outlet / exhaust pipe protrudes from the upper manhole cover, and a venting joint is provided at the protruding part of the upper end, and at least one sealing gasket is provided between the outer wall of the water outlet / exhaust pipe and the water outlet / exhaust hole.

[0012] Furthermore, an interference fit is adopted between the water outlet / exhaust hole and the sealing gasket.

[0013] Furthermore, at least two fixing ear seats overlapping in the height direction are arranged on the outer edge side walls of the upper semicircular cover and the lower semicircular ring cover, and limiting screw holes are provided on the fixing ear seats. Screws are passed through the limiting screw holes of the upper semicircular cover and the lower semicircular ring cover to fix the lower manhole cover directly below the upper manhole cover.

[0014] Furthermore, a locator for locating the lower manhole cover is welded on the outer edge of the lower surface of the upper semicircular cover.

[0015] Furthermore, a rubber gasket is arranged at the outer diameter of the rubber sealing plug and the inner diameter of the semicircular groove.

[0016] Furthermore, the rubber sealing plug is provided with a metal pull ring.

[0017] Furthermore, a pull ring groove is provided on the upper surface of the rubber sealing plug.

[0018] Compared with the traditional method of welding manhole covers, the present invention has the advantages of simple equipment, easy operation, saving manpower, etc., and has good sealing effect, can withstand high pressure, and can be effectively reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 labor.

[0020] Figure 1a-1b is a side view of the upper manhole cover;

[0021] Figure 1c It is a top view of the two semicircular upper half-circle covers;

[0022] Figure 2a-2b It is a side view of the manhole cover;

[0023] Figure 2c It is a top view of the lower semicircular ring cover of two semi-circular pieces;

[0024] Figure 3a-3bThe top view and side cross-sectional view of the rubber sealing plug at the center hole of the upper manhole cover;

[0025] Figure 4 It is a side view of the water outlet / exhaust pipe;

[0026] Figure 5a-5b This is a schematic diagram of the upper and lower manhole covers installed in the well pipe. DETAILED DESCRIPTION

[0027] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0028] In order to fully understand the present invention, detailed steps and detailed structures will be proposed in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0029] The present invention provides a detachable closed precipitation well cover, which comprises a circular upper well cover 1 and an annular lower well cover 2. The lower well cover 2 is fixed directly below the upper well cover 1 through a connecting mechanism, and their outer diameters are comparable. The upper manhole cover 1 is composed of two semicircular upper semicircular covers, and the centers of the two upper semicircular covers are each provided with a concave semicircular groove 1-5. The two upper semicircular covers are connected together by a Yuanbao nut 8 and a bolt 6 to form a circular hole in the middle, and the circular hole is provided with a rubber sealing plug 3, and the rubber sealing plug 3 is provided with a water outlet / exhaust hole; the lower manhole cover 2 is composed of two semicircular lower semicircular ring covers, and the two lower semicircular ring covers are screwed together through a limiting screw hole 2-1; a rubber water stop ring 1-2 is provided on the lower surface of the upper manhole cover 1, and a rubber water stop ring 2-2 is provided on the inner diameter of the lower manhole cover 2; a water outlet / exhaust pipe 4-1 is vertically inserted in the circular through hole in the center of the upper manhole cover 1, and the upper end of the water outlet / exhaust pipe 4-1 is protruding from the upper manhole cover 1, and a venting joint 4-3 is provided on the protruding part of the upper end, and at least one sealing gasket 4-2 is provided between the outer wall of the water outlet / exhaust pipe 4-1 and the water outlet / exhaust hole 3-3.

[0030] In an optional embodiment, an interference fit is adopted between the water outlet / vent hole 3-3 and the sealing gasket 4-2, that is, the outer diameter of the sealing gasket 4-2 is slightly larger than the outer diameter of the water outlet / vent hole 3-3, thereby ensuring the sealing performance.

[0031] In an optional embodiment, at least two fixing ear seats overlapping in the height direction are arranged on the outer edge side walls of the upper semicircular cover and the lower semicircular ring cover, and limiting screw holes 1-3, 2-3 are provided on the fixing ear seats. Screws are passed through the limiting screw holes of the upper semicircular cover and the lower semicircular ring cover to fix the lower manhole cover 2 directly below the upper manhole cover 1.

[0032] In an optional embodiment, a locator 7 for positioning the lower manhole cover 2 is welded on the outer edge of the lower surface of the upper semicircular cover. The locator 7 is, for example, a block arranged on the lower surface of the upper semicircular cover to facilitate the positioning of the lower manhole cover.

[0033] In an optional embodiment, rubber gaskets 1-4 are arranged at the outer diameter of the rubber sealing plug 3 and the inner diameter of the semicircular groove, which can improve the sealing performance of the rubber sealing plug 3 during installation.

[0034] like Figure 3a-3b As shown, in an optional embodiment, a metal pull ring 3-1 is provided on the rubber sealing plug 3 to facilitate pulling out the rubber sealing plug 3, and a pull ring groove 3-2 is further provided on the upper surface of the rubber sealing plug 3 to accommodate the pull ring when the manhole cover is closed.

[0035] The installation of the new removable closed precipitation manhole cover includes the following steps:

[0036] 1) Insert the water outlet / exhaust pipe 4-1 into the appropriate position in the well, insert three sealing pads 4-2 from the upper end of the water outlet / exhaust pipe 4-1, and fix it with wire at the lower end.

[0037] 2) Insert the special wellhead rubber sealing plug 3 from the upper end of the water outlet / exhaust pipe 4-1 and install it on the well pipe mouth, and press it in with a little force until only the upper protruding part of the water outlet / exhaust pipe 4-1 is left outside the well pipe mouth, that is, only the venting joint 4-3 is exposed above the rubber sealing plug 3.

[0038] 3) Put the two semicircular upper half-circle covers onto the well pipe opening, cover the wellhead rubber sealing plug 3, and connect the two semicircular upper half-circle covers together with bolts through the horizontal limit screw holes 1-1.

[0039] 4) Weld the locator 7 to the lower edge of the upper manhole cover, and install the lower manhole cover at the lower edge of the locator 7; that is, connect the two lower semicircular ring covers together with bolts through the horizontal limit screw holes 2-1.

[0040] 5) Use bolts 6 to connect the upper manhole cover 1 and the lower manhole cover 2 through the vertical limit screw holes 1-3 and 2-3, and the installation is completed.

[0041] The disassembly steps are exactly the opposite of the installation steps and will not be described in detail here.

[0042] The preferred embodiments of the present invention are described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A detachable closed drainage manhole cover, characterized in that: The detachable closed drainage well cover is provided with a circular upper well cover (1) and an annular lower well cover (2), the lower well cover (2) being fixed directly below the upper well cover (1) by a connecting mechanism and the outer diameters of the two are equal; The upper manhole cover (1) is composed of two semicircular upper semicircular covers, the centers of the two upper semicircular covers are each provided with a concave semicircular groove, the two upper semicircular covers are connected together by a nut (8) and a bolt (6) and a circular hole is formed in the middle, the circular hole is provided with a rubber sealing plug (3), and the rubber sealing plug (3) is provided with a water outlet / air exhaust hole; The lower manhole cover (2) is composed of two lower semicircular ring covers, and the two lower semicircular ring covers are connected together through limiting screw holes (2-1); The lower surface of the upper manhole cover (1) and the inner diameter of the lower manhole cover are both provided with rubber water stop rings, including an upper rubber water stop ring (1-2) located on the lower surface of the upper manhole cover (1) and a lower rubber water stop ring (2-2) located on the inner diameter of the lower manhole cover; A water outlet / exhaust pipe (4-1) is vertically inserted into the circular through hole at the center of the upper manhole cover (1); the upper end of the water outlet / exhaust pipe (4-1) is protruding from the upper manhole cover (1), and a venting joint (4-3) is provided at the protruding portion of the upper end; and at least one sealing gasket (4-2) is provided between the outer wall of the water outlet / exhaust pipe (4-1) and the water outlet / exhaust hole; The upper manhole cover (1) comprises a cover plate and an annular wall extending axially at the outer edge of the cover plate, the upper rubber water stop ring (1-2) is arranged on the inner side of the annular wall, and a gap exists between the upper rubber water stop ring (1-2) and the cover plate; When the upper manhole cover is installed on the well pipe, the upper rubber water stop ring (1-2) and the annular wall are located outside the pipe wall of the well pipe.

2. The detachable closed drainage manhole cover according to claim 1 is characterized in that: An interference fit is adopted between the water outlet / air vent hole and the sealing gasket (4-2).

3. The detachable closed drainage manhole cover according to claim 1 is characterized in that: At least two fixing ear seats overlapping in the height direction are arranged on the outer edge side walls of the upper semicircular cover and the lower semicircular ring cover, and limiting screw holes are arranged on the fixing ear seats. The lower manhole cover (2) is fixed directly below the upper manhole cover (1) by screws passing through the limiting screw holes of the upper semicircular cover and the lower semicircular ring cover.

4. The detachable closed drainage manhole cover according to claim 1, characterized in that: A locator (7) for locating the lower manhole cover (2) is welded to the outer edge of the lower surface of the upper semicircular cover.

5. The detachable closed drainage manhole cover according to claim 1, characterized in that: Rubber gaskets (1-4) are arranged at the outer diameter of the rubber sealing plug (3) and the inner diameter of the semicircular groove.

6. The detachable closed drainage manhole cover according to claim 1, characterized in that: The rubber sealing plug (3) is provided with a metal pull ring (3-1).

7. The detachable closed drainage manhole cover according to claim 6, characterized in that: A pull ring groove (3-2) is provided on the upper surface of the rubber sealing plug (3).

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