CN113789801B

CN113789801B - Water-rich foundation pit dewatering well plugging device and method

Info

Publication number: CN113789801B
Application number: CN202111243749.5A
Authority: CN
Inventors: 王军; 韩林鹏; 赵参; 张磊刚; 王鉴
Original assignee: China Railway Guangzhou Engineering Group Co Ltd CRECGZ; CRECGZ Urban Rail Engineering Co Ltd
Current assignee: China Railway Guangzhou Engineering Group Co Ltd CRECGZ; CRECGZ Urban Rail Engineering Co Ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-09-02
Anticipated expiration: 2041-10-25
Also published as: CN113789801A

Abstract

The invention discloses a plugging device and a method for plugging a dewatering well of a water-rich foundation pit, wherein the plugging device comprises a steel plate, the steel plate is fixed in the dewatering well and used for plugging the dewatering well, and a through hole for inserting a water pumping pipe into the dewatering well penetrates through the steel plate; the valve is used for plugging the through hole after the water pumping pipe is pumped out of the dewatering well; the connecting piece is used for connecting the valve and the steel plate, and the connecting piece penetrates through a grouting hole for inserting a grouting pipe into the precipitation well.

Description

Water-rich foundation pit dewatering well plugging device and method

Technical Field

The invention relates to the technical field of dewatering well plugging, in particular to a dewatering well plugging device for a water-rich foundation pit and a dewatering well plugging method.

Background

With the progress of building technology, the national infrastructure gradually develops towards underground space, such as subways and the like, but because underground water is rich and has certain pressure bearing, a bedrock fracture water path is difficult to find, a sand layer becomes thin after a foundation pit is found at the bottom, bedrock fracture water directly penetrates through the sand layer to gush out of a base plane, the action radius of the originally designed dewatering well cannot realize the function of drying the base, a dry operation surface cannot be provided for waterproof construction, and therefore the problem of how to improve the base plane gush out of the underground water is particularly critical.

In the related technology, by adopting the method of additionally arranging the precipitation well, the underground water layer is communicated with the precipitation well, the underground water can be intensively gushed out from the precipitation well so as to meet the construction operation requirement, and after the construction of the construction pavement cushion is finished, concrete is injected into the precipitation well, so that the plugging construction is completed.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: when the water flow in the dewatering well is large, the water flow easily gushes out from the wellhead of the dewatering well and disperses concrete, so that the concrete is difficult to condense, the plugging quality of the dewatering well is reduced, the water seepage phenomenon is easy to occur, and the improvement space is still provided.

Disclosure of Invention

The invention provides a plugging device for a dewatering well of a water-rich foundation pit and a method for plugging the dewatering well, aiming at improving the plugging quality of the dewatering well.

The invention provides a plugging device for a dewatering well of a water-rich foundation pit and a method for plugging the dewatering well, which adopt the following technical scheme:

the utility model provides a rich water foundation ditch precipitation well plugging device, includes:

the steel plate is fixed in the precipitation well and used for plugging the precipitation well, and a through hole for inserting the water pumping pipe into the precipitation well penetrates through the steel plate;

the valve is used for plugging the through hole after the water pumping pipe is pumped out of the dewatering well;

and the connecting piece is used for connecting the valve and the steel plate, and a grouting hole for inserting the grouting pipe into the precipitation well penetrates through the connecting piece.

Through adopting above-mentioned technical scheme, the steel sheet has played the effect that the separation groundwater gushed on water, insert precipitation well with the drinking-water pipe, thereby accessible self priming pump lasts to the groundwater in the precipitation well and draws water, make groundwater liquid level descend, thereby the time that the extension groundwater gushes, take out from the precipitation well after the drinking-water pipe, fix the valve on the steel sheet and shutoff through-hole through the connecting piece, further shutoff precipitation well, the slip casting hole of slip casting hole accessible connecting piece inserts in the precipitation well and carries out the slip casting operation, finally reach the stagnant water effect, be favorable to improving the shutoff effect to precipitation well.

Preferably, a structural bottom plate is poured on the surface of the base layer, the dewatering well is buried in the structural bottom plate, an operation groove communicated with the dewatering well is sunken in the upper end face of the dewatering well, and filling materials are filled in the operation groove.

Through adopting above-mentioned technical scheme, after drawing water and slip casting work, the structure bottom plate carries out the stagnant water to the peripheral basic unit surface of precipitation well, and in addition, the stopping also carries out the shutoff to the operation groove to bury the precipitation well in the structure bottom plate completely, be favorable to further improving the shutoff effect to the precipitation well.

Preferably, a plurality of transverse steel bars are embedded in the structural bottom plate, and protrude out of the inner wall of the operation groove.

By adopting the technical scheme, after the filler is filled into the operation groove, the transverse reinforcing steel bar bulge is embedded in the filler, so that the integrity of the filler and the structural bottom plate is improved.

Preferably, a filter pipe is arranged in the dewatering well, and the filter pipe is filled with broken stones.

By adopting the technical scheme, the combination of the broken stones and the filter pipes plays a role of a filter layer, is beneficial to improving the phenomenon of water gushing on the ground and is convenient for drainage.

Preferably, the precipitation well outer peripheral face is provided with the stagnant water flange, the stagnant water flange is buried underground in the structure bottom plate, heavy groove diapire and stagnant water flange up end all are provided with stagnant water and glue, the sealed butt in heavy groove internal perisporium of stagnant water glue periphery of heavy groove diapire department, the sealed butt in precipitation well outer wall of the sealed butt in stagnant water glue internal periphery of stagnant water flange top.

Through adopting above-mentioned technical scheme, and set up waterproof component at precipitation well outer wall, precipitation well heavy inslot's inner wall, thereby be favorable to further improving the stagnant water effect between the junction of precipitation well and each concrete structure on the whole.

Preferably, the peripheral face of two adjacent horizontal reinforcing bars of heavy groove diapire department rotates respectively to be equipped with the sleeve pipe, two there is the clearance that supplies the sealing compound to pass between the sleeve pipe, works as when the sealing compound passes from the clearance between two sleeve pipes, two the sleeve pipe supports tightly the sealing compound.

Through adopting above-mentioned technical scheme, can rotate one of them sheathed tube condition, slowly send stagnant water to heavy groove diapire with the help of the frictional force of sleeve pipe and stagnant water glue, be favorable to improving stagnant water gluey installation effectiveness and installation quality.

Preferably, a water outlet pipe is arranged in the precipitation well, and the water outlet pipe penetrates through the connecting piece and extends into the precipitation well.

Through adopting above-mentioned technical scheme, as rising gradually along with the thick liquid level of sediment in precipitation well bottom, still have partial water in the precipitation well and also follow and rise, water can be followed the outlet pipe and discharged, is favorable to improving the problem of basic unit infiltration.

A method for plugging a dewatering well by a plugging device for a dewatering well of a water-rich foundation pit comprises the following steps:

s1: installation of a plugging device and precipitation construction: firstly, hoisting a filter pipe into a precipitation well, then filling crushed stone into the filter pipe, then welding a steel plate on the inner wall of the precipitation well and inserting the steel plate into the precipitation well, then enabling a water pumping pipe of a self-priming pump to penetrate through a through hole of the steel plate and inserting the self-priming pump into the precipitation well, and starting the self-priming pump and keeping continuous water pumping;

s2: pouring a structural bottom plate: pouring a structural bottom plate on the surface of the base layer, and forming an operation groove above the dewatering well;

s3: grouting in a precipitation well: then pumping the water pumping pipe out of the precipitation well, fixing the valve at the steel plate through the connecting piece and plugging the through hole, during grouting, penetrating the grouting pipe through the grouting hole and inserting the grouting pipe into the precipitation well, inserting the water outlet pipe into the precipitation well, then injecting the grout into the precipitation well for stopping water until the grout is discharged from the water outlet pipe, plugging the outlet of the water outlet pipe, and simultaneously stopping grouting;

s4: binding and pouring filler for steel bars: the two sleeves are respectively rotatably sleeved on the outer peripheral surfaces of two adjacent transverse steel bars at the bottom wall of the sinking groove, then the water-stopping rubber plug is put into a gap between the two adjacent sleeves, then the water-stopping rubber plug is sent to the bottom of the sinking groove through the rotating sleeves and by friction force and is in place, then the steel bars are bound and connected in the operation groove, and finally the operation groove is filled with fillers to finish the plugging work of the operation groove.

Through adopting above-mentioned technical scheme, progressively carry out the stagnant water construction to the periphery and the inside of precipitation well, be favorable to further improving the shutoff effect to the precipitation well.

Drawings

Fig. 1 is a state schematic diagram of the plugging device for the dewatering foundation pit water-rich well in the embodiment of the application when pumping water.

FIG. 2 is a state schematic diagram of the foundation ditch precipitation well plugging device during grouting of this application embodiment.

Fig. 3 is an enlarged schematic view at a in fig. 2.

Fig. 4 is a state schematic diagram of a water-rich foundation pit dewatering well plugging device plugging a dewatering well according to an embodiment of the application.

Description of reference numerals: 1. a base layer; 2. a structural floor; 21. transverse reinforcing steel bars; 211. connecting reinforcing steel bars; 22. sinking a groove; 23. connecting grooves; 24. a sleeve; 3. a dewatering well; 31. a water stop flange; 32. a steel plate; 321. a through hole; 33. a lower connecting flange; 331. a bolt; 34. an upper connecting flange; 35. a rubber ring; 36. a valve; 37. a filter tube; 4. water stopping glue; 5. a water pumping pipe; 6. a grouting pipe; 7. a water outlet pipe; 8. a filler; 9. and (4) crushing the stones.

Detailed Description

The invention is described in further detail below with reference to figures 1-4.

The embodiment of the invention discloses a plugging device for a dewatering well of a water-rich foundation pit and a method for plugging the dewatering well. Referring to fig. 1, the plugging device for the dewatering well 3 of the water-rich foundation pit comprises a steel plate 32 for plugging the dewatering well 3, and the steel plate 32 is fixedly welded with the wall of the dewatering well 3. The steel sheet 32 middle part is run through and is supplied drinking-water pipe 5 male through-hole 321, through will pass the through-hole 321 with the drinking-water pipe 5 that the self priming pump is connected and stretch into precipitation well 3 in, continuous underwater pumping at the self priming pump for the groundwater liquid level descends, so that in follow-up slip casting shutoff operation, the thick liquid can deposit in precipitation well 3 bottoms, is favorable to carrying out whole shutoff to precipitation well 3 inside.

Before the steel plate 32 blocks the precipitation well 3, the filter pipe 37 is hung in the precipitation well 3, the outer wall of the filter pipe 37 abuts against the well wall of the precipitation well 3, the lower end of the filter pipe 37 is inserted into the underground water layer, the broken stone 9 is embedded in the filter pipe 37, the filter pipe 37 can be penetrated by water, the broken stone 9 can be prevented from being separated from the precipitation well 3, the broken stone 9 plays a role of a filter layer, and drainage is facilitated.

In the actual job site, the well mouth of the dewatering well 3 is higher than the surface of the base layer 1, the water stop flange 31 is welded and fixed on the outer wall of the dewatering well 3, the structural bottom plate 2 is laid on the upper surface of the base layer 1, the water stop flange 31 is embedded in the structural bottom plate 2, and the water stop flange 31 forms a first water stop layer on the peripheral side of the dewatering well 3, so that the improvement of the water seepage condition on the peripheral side of the dewatering well 3 is facilitated. In addition, the upper surface of the structure bottom plate 2 is sunken with an operation groove, the operation groove comprises a sinking groove 22 and a connecting groove 23, the sinking groove 22 is arranged on the upper surface of the structure bottom plate 2, the connecting groove 23 is arranged on the bottom wall of the sinking groove 22 and is communicated with the precipitation well 3, and the diameter of the sinking groove 22 is larger than that of the connecting groove 23, so that subsequent water pumping and grouting operations can be carried out conveniently.

Referring to fig. 2 and 3, before grouting, the pumping pipe 5 needs to be drawn out from the through hole 321, and during grouting, the pumping pipe easily gushes out from the through hole 321, so the plugging device further comprises a valve 36 for opening and closing the through hole 321 and a connector for connecting the steel plate 32 and the valve 36, wherein the valve 36 is specifically a ball valve. Specifically, the connecting member includes a lower connecting flange 33 welded in the through hole 321 and an upper connecting flange 34 welded and fixed to the valve 36, the lower connecting flange 33 has a plurality of bolts 331 embedded in a reverse direction, and the upper connecting flange 34 and the lower connecting flange 33 are screwed and fixed by the bolts 331, thereby implementing the step of installing the valve 36. The rubber ring 35 is arranged between the upper connecting flange 34 and the lower connecting flange 33, which is beneficial to reducing the sealing performance between the upper connecting flange 34 and the lower connecting flange 33.

The upper connecting flange 34 is penetrated with a grouting hole for the grouting pipe 6 to pass through, the grouting hole is communicated with the precipitation well 3, and when the precipitation well 3 is grouted, the grouting pipe 6 can pass through the grouting hole and extend into the precipitation well 3 so as to facilitate grouting.

When grouting, a water outlet pipe 7 is arranged in the dewatering well 3, the water outlet pipe 7 penetrates through the upper connecting flange 34 and extends into the dewatering well 3, when the liquid level of the slurry settled at the bottom of the dewatering well 3 gradually rises, part of water in the dewatering well 3 also rises along with the rising, and the water can be discharged from the water outlet pipe 7, so that the problem of water seepage of the base layer 1 is solved.

A plurality of transverse steel bars 21 are embedded in the structural bottom plate 2, and the transverse steel bars 21 respectively protrude out of the inner peripheral wall of the sinking groove 22 and the inner peripheral wall of the connecting groove 23, so that the steel bars are bound in the sinking groove 22 and the connecting groove 23. The sealing material is filled in the sinking groove 22 and the connecting groove 23, so that the structural bottom plate 2 is filled after the construction is finished, the dewatering well 3 is further sealed, and the sealing effect of the dewatering well 3 is improved.

The up end of heavy groove 22 diapire and stagnant water flange 31 all is provided with stagnant water and glues 4, and stagnant water is glued 4 and is the annular, and the stagnant water of heavy groove 22 diapire glues 4 peripheral seal butt in heavy groove 22 internal perisporium, and the stagnant water of stagnant water flange 31 top is glued 4 internal peripheral seal butt in precipitation well 3 peripheries, is favorable to further improving the stagnant water effect.

In order to facilitate the binding of the connecting steel bars 211, the protruding length of the transverse steel bars 21 is long, and part of the transverse steel bars 21 is close to the bottom wall of the sinking groove 22, but this also makes it inconvenient for an installer to place the waterproof glue 4 into the sinking groove 22 and make the waterproof glue fit to the inner peripheral wall of the sinking groove 22. Therefore, in order to improve the installation efficiency of the waterproof adhesive 4, when the filler 8 is poured into the sinking groove 22 and the connecting groove 23, the sleeves 24 are respectively rotatably sleeved on the outer peripheral surfaces of a group of two adjacent transverse steel bars 21, the gap between the two sleeves 24 can be used for the waterproof adhesive 4 to pass through, when the waterproof adhesive 4 passes through the gap between the two sleeves 24, the two sleeves 24 abut against the waterproof adhesive 4, one sleeve 24 can be rotated, and the waterproof adhesive 4 is slowly conveyed to the bottom wall of the sinking groove 22 by virtue of the friction force between the sleeve 24 and the waterproof adhesive 4, so that the installation efficiency and the installation quality of the waterproof adhesive 4 are improved.

A method for plugging a dewatering well of a water-rich foundation pit by using a plugging device comprises the following steps:

s1: plugging device installation and precipitation construction: referring to fig. 4, firstly, the filter pipe 37 is hung in the dewatering well 3, then the filter pipe 37 is filled with broken stones 9, then the circular steel plate 32 with the thickness of 10mm and the diameter of 800mm is welded with the inner wall of the dewatering well 3 so as to plug the well mouth of the dewatering well 3, the bolts 331 are reversely embedded in the lower connecting flange 33, then the water pumping pipe 5 of the self-priming pump penetrates through the through hole 321 of the steel plate 32 and is inserted into the dewatering well 3, then the self-priming pump is started, and continuous water pumping is kept.

S2: pouring the structural bottom plate 2: firstly, welding a water stopping flange 31 on the outer peripheral wall of the dewatering well 3, bonding a water stopping adhesive 4 at the joint between the upper end of the water stopping flange 31 and the outer peripheral wall of the dewatering well 3, wherein the water stopping adhesive 4 is specifically a water swelling water stopping adhesive 4, then pouring a structural bottom plate 2 on the surface of the base layer 1, burying the water stopping flange 31 in the structural bottom plate 2, and forming a sinking groove 22 and a connecting groove 23 above the dewatering well 3 so as to facilitate subsequent grouting construction.

S3: grouting in the dewatering well 3: welding and fixing an upper connecting flange and a valve 36, pumping a water pumping pipe 5 out of the dewatering well 3, screwing and fixing the upper connecting flange and a lower connecting flange through a bolt 331, wherein the valve 36 is a ball valve in the embodiment, when the valve is installed, the ball valve is in a closed state, during grouting, a grouting pipe 6 penetrates through a grouting hole and is inserted into the dewatering well 3, a water outlet pipe 7 is inserted into the dewatering well 3, the grout is specifically double-grout, then the double-grout is injected into the dewatering well 3 to stop water, part of underground water can be discharged through the water outlet pipe 7, and when the grout overflows from the water outlet pipe 7, an outlet of the water outlet pipe 7 is plugged by a plugging plug, and grouting is stopped at the same time.

S4: binding and pouring of reinforcing steel bars, and filling material 8: the two sleeves 24 are respectively rotatably sleeved on the outer peripheral surfaces of two adjacent transverse steel bars 21 at the bottom wall of the sinking groove 22, the waterproof glue 4 is plugged into a gap between the adjacent sleeves 24, then the waterproof glue 4 is conveyed into the bottom of the sinking groove 22 through friction force by rotating the sleeves 24 and is put in place, then the waterproof glue 4 is fixed at the bottom wall of the sinking groove 22 in a bonding mode, the steel bars 211 are bound and connected in the sinking groove 22, finally the sinking groove 22 and the connecting groove 23 are filled with the filling material 8, the filling material 8 is non-shrinkage concrete, and after the non-shrinkage concrete is solidified, the water outlet pipe 7 protruding out of the surface of the filling material 8 is cut off, so that the plugging construction of the precipitation well 3 is completed.

The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a water-rich foundation ditch precipitation well plugging device which characterized in that: the method comprises the following steps:

the water pumping pipe (5) is inserted into the precipitation well (3) through a through hole (321) formed in the steel plate (32), and the steel plate (32) is fixed in the precipitation well (3) and used for plugging the precipitation well (3);

the valve (36) is used for plugging the through hole (321) after the water pumping pipe (5) is pumped out of the dewatering well (3);

the connecting piece is used for connecting the valve (36) and the steel plate (32), and a grouting hole for inserting the grouting pipe (6) into the dewatering well (3) penetrates through the connecting piece;

a structural bottom plate (2) is poured on the surface of the base layer (1), a dewatering well (3) is buried in the structural bottom plate (2), an operation groove communicated with the dewatering well (3) is sunken in the upper end surface of the dewatering well (3), and filling materials (8) are filled in the operation groove;

the operation tank comprises a sinking tank (22) and a connecting tank (23), the sinking tank (22) is arranged on the upper surface of the structural bottom plate (2), the connecting tank (23) is arranged on the bottom wall of the sinking tank (22) and communicated with the dewatering well (3), and the diameter of the sinking tank (22) is larger than that of the connecting tank (23);

a plurality of transverse steel bars (21) are embedded in the structural bottom plate (2), and the transverse steel bars (21) protrude out of the inner wall of the operation groove;

a water stopping flange (31) is arranged on the peripheral surface of the dewatering well (3), the water stopping flange (31) is buried in the structural bottom plate (2), water stopping glue (4) is arranged on the bottom wall of the sinking groove (22) and the upper end surface of the water stopping flange (31), the periphery of the water stopping glue (4) at the bottom wall of the sinking groove (22) is in sealing butt joint with the inner peripheral wall of the sinking groove (22), and the inner periphery of the water stopping glue (4) above the water stopping flange (31) is in sealing butt joint with the outer wall of the dewatering well (3);

sleeves (24) are respectively rotatably sleeved between two adjacent pairs of transverse steel bars (21) at the bottom wall of the sinking groove (22), a gap for the water stop glue (4) to pass through is formed between the two sleeves (24), and when the water stop glue (4) passes through the gap between the two sleeves (24), the two sleeves (24) are abutted against the water stop glue (4);

the waterproof glue (4) can be slowly sent to the bottom wall of the sinking groove (22) by the friction force of the sleeve (24) and the waterproof glue (4) under the condition of rotating one of the sleeves (24).

2. The plugging device for the dewatering well of the water-rich foundation pit as claimed in claim 1, wherein: a filter pipe (37) is arranged in the dewatering well (3), and gravels (9) are filled in the filter pipe (37).

3. The plugging device for the dewatering well of the water-rich foundation pit as claimed in claim 2, wherein: a water outlet pipe (7) is arranged in the dewatering well (3), and the water outlet pipe (7) penetrates through the connecting piece and extends into the dewatering well (3).

4. The method for plugging the dewatering well of the dewatering foundation pit and the dewatering well plugging device according to claim 3, wherein the method comprises the following steps: the method comprises the following steps:

s1: installation of a plugging device and precipitation construction: firstly, a filter pipe (37) is lifted into a dewatering well (3), then crushed stone (9) is filled into the filter pipe (37), then a steel plate (32) is welded on the inner wall of the dewatering well (3), then a water pumping pipe (5) of a self-priming pump penetrates through a through hole (321) of the steel plate (32) and is inserted into the dewatering well (3), then the self-priming pump is started, and continuous water pumping is kept;

s2: pouring a structural bottom plate: pouring a structural bottom plate (2) on the surface of the base layer (1), and forming an operation groove above the dewatering well (3);

s3: grouting in a precipitation well: then the water pumping pipe (5) is pumped out of the precipitation well (3), then the valve (36) is fixed at the position of the steel plate (32) through the connecting piece and blocks the through hole (321), during grouting, the grouting pipe (6) penetrates through the grouting hole and is inserted into the precipitation well (3), the water outlet pipe (7) is inserted into the precipitation well (3), then grout is injected into the precipitation well (3) for water stopping, when the grout is blown out from the water outlet pipe (7), the outlet of the water outlet pipe (7) is blocked, and grouting is stopped at the same time;

s4: binding and pouring filler for steel bars: the two sleeves (24) are respectively rotatably sleeved between two adjacent pairs of transverse steel bars (21) at the bottom wall of the sinking groove (22), then the waterproof glue (4) is stuffed into a gap between the adjacent sleeves (24), then the waterproof glue (4) is sent to the bottom of the sinking groove (22) through friction force and is put in place through the rotation of the sleeves (24), then the steel bars (211) are bound and connected in the operation groove, and finally the operation groove is filled with the filler (8) to finish the plugging work of the operation groove.