CN111456054A

CN111456054A - Pipe well structure suitable for high-permeability alluvial stratum, precipitation construction system and precipitation construction method

Info

Publication number: CN111456054A
Application number: CN202010289581.0A
Authority: CN
Inventors: 李连祥; 王雷; 赵永新; 赵忠杨; 高国忠; 曾纯品; 贾斌
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-07-28
Anticipated expiration: 2040-04-14
Also published as: CN111456054B

Abstract

The invention discloses a pipe well structure and precipitation construction system and method suitable for a high-permeability alluvial stratum, and the technical scheme is as follows: the well casing is characterized by comprising a well casing, wherein filter cloth is wrapped outside the well casing, and filter materials filled in layers are arranged outside the filter cloth; the adjacent well-saving pipes are connected through an inter-pipe joint, and the tail end of the bottom well-saving pipe is connected with a well seat. The well pipe is stably connected, the problem of pipe well silt in loose water-rich high-permeability flush stratum can be solved by matching with the piston cleaning device, the construction quality of the pipe well is effectively improved, and the service life of the pipe well is prolonged.

Description

Pipe well structure suitable for high-permeability alluvial stratum, precipitation construction system and precipitation construction method

Technical Field

The invention relates to the technical field of foundation pit dewatering, in particular to a pipe well structure suitable for a high-permeability alluvial stratum, a dewatering construction system and a method.

Background

The pipe well precipitation is the most common and effective method in foundation pit precipitation due to convenient construction and economic rationality, and the sand-free concrete pipe is the most economic well pipe type in the pipe well. During the use process, the silt well is the most common disease of the pipe well, and the pipe well in the loose water-rich high-permeability alluvial formation is more susceptible to the silt well. The silt well can be divided into an out-well silt well and an in-well silt well, wherein the out-well silt well is the outer wall of the well pipe with the soil particles silted up, and the in-well silt well is formed by silting up the soil particles in the well. Because no sand concrete pipe wholeness is less strong, does not have vertical connection almost, so can't solve the problem of the outer silt well of well. For a silt well in the well, measures such as wrapping filter cloth and washing the well can be only adopted to avoid the silt well as much as possible, and the inventor finds that the existing method is complex in construction, time-consuming and labor-consuming and difficult in quality guarantee.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a pipe well structure, a precipitation construction system and a method suitable for a high-permeability alluvial stratum, which can solve the problem of pipe well silt in a loose water-rich high-permeability alluvial stratum, effectively improve the construction quality of a pipe well and prolong the service life of the pipe well.

In order to achieve the purpose, the invention is realized by the following technical scheme:

in a first aspect, an embodiment of the invention provides a pipe well structure suitable for a high-permeability alluvial stratum, which comprises a pipe well, wherein filter cloth is wrapped outside the pipe well, and filter materials filled in layers are arranged outside the filter cloth; the adjacent tube-saving wells are connected through an inter-tube joint, and the tail end of the bottom tube-saving well is connected with a well seat.

As a further limitation, the pipe fitting joint is a snap-in groove joint, and the snap-in groove joint comprises a plug board and a matching board which are matched with each other; the mating plates can form a gap for the insertion plate to enter under the action of the insertion plate.

By way of further limitation, the swivel snap-on fitting comprises a connector block disposed at the top end of the lower casing pipe and L-shaped connector ribs disposed at the bottom end of the upper casing pipe, the sides of the connector block forming rib-passing voids for mating L-shaped connector ribs.

In a second aspect, the embodiment of the invention also provides a pipe well precipitation construction system suitable for a high-permeability alluvial formation, which comprises a piston well washing device and the pipe well structure, wherein the piston well washing device extends into the pipe well to wash the inner wall of the pipe well.

By way of further limitation, the piston well-flushing device comprises a piston, a suction pump and a drain pipe, wherein the drain pipe is connected with the suction pump through the piston.

In a third aspect, an embodiment of the present invention further provides a pipe well precipitation construction method suitable for a high-permeability alluvial formation, where the pipe well precipitation construction system is adopted, and includes:

installing a well base and a bottom pipe well: the well base blocks the well bottom, and a hoisting rope passes through a rope threading groove at the bottom of the well base to hoist the bottom tube-saving well;

the pipe joints are connected and the filter cloth is connected: after the bottom-joint well pipe is placed to a set position, a second joint well pipe is installed, and the second joint well pipe is connected with the bottom-joint well pipe through an inter-pipe joint; naturally drooping the upper section of filter cloth, tightening the nylon fastener tape to enable the nylon fastener tape to be tightly tied on the outer wall of the bottom-section well pipe, forming double-layer lap joint with the filter cloth of the bottom-section well pipe, and sequentially installing the nylon fastener tape to the top section of the pipe well;

filling a filter material: filling filter materials in layers according to the properties of soil layers at different depths;

piston well flushing: when a well is washed, the water pump is firstly put in, and the water drain pipe passes through the hole in the middle of the piston and then is put in the piston; the piston moves up and down when the well is washed; and during well flushing, a water suction pump is adopted to pump out the silt-doped sewage in time.

The beneficial effects of the above-mentioned embodiment of the present invention are as follows:

(1) according to one or more embodiments of the invention, adjacent pipe wells are connected through an inter-pipe joint, the inter-pipe joint adopts a rotary hasp type joint or a clamping groove type joint, the rotary hasp type joint can improve the integrity of the pipe wells, when an out-of-well silt well occurs, the pipe wells can be rotated and pulled in a specific direction, and the out-of-well silt is stirred, so that the purpose of dredging is achieved; meanwhile, if the well pipe has the problems of deviation, inclination and the like during installation, the deviation can be corrected by a rotating and pulling method; the clamping groove type joint ensures that the upper and lower well pipes are tightly connected through the matching plate and the inserting plate, and effectively prevents soil particles from entering the well through a gap between the pipes;

(2) the filter cloth of one or more embodiments of the invention is preassembled with the nylon fastener tape, the nylon fastener tape is preassembled in a factory, each section of well pipe enters the filter cloth installation step after being installed, the upper section of filter cloth is reserved in a proper amount and is lapped with the lower section of filter cloth, and the tight connection between pipe sections is further ensured;

(3) according to one or more embodiments of the invention, the piston well washing device is arranged, so that during well washing, positive pressure and negative pressure generated by the up-and-down movement of the piston strip the silt on the well wall, and the water is discharged out of the well through the water discharge pipe by the water suction pump, thereby achieving the purpose of well washing.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic illustration of a tube well precipitation system according to one or more embodiments of the present invention;

FIG. 2 is a schematic structural diagram of a filter cloth according to one or more embodiments of the present invention;

FIG. 3 is a schematic illustration of a piston construction according to one or more embodiments of the present invention;

FIG. 4 is a schematic view of a snap-in coupling configuration according to one or more embodiments of the present disclosure;

FIG. 5 is a transverse cross-sectional view of a connection block of a swivel snap fitting according to one or more embodiments of the present invention;

FIG. 6 is a transverse cross-sectional view of an L-shaped connector web of a swivel snap fitting according to one or more embodiments of the present invention;

FIG. 7 is a longitudinal cross-sectional view of a connection block of a swivel snap fitting according to one or more embodiments of the present invention;

fig. 8 is a longitudinal cross-sectional view of an L-shaped connecting rib of a swivel snap fitting according to one or more embodiments of the present invention;

fig. 9-10 are diagrams of a swivel snap fitting ribbing in accordance with one or more embodiments of the present invention;

FIG. 11 is a schematic view of a swivel snap fitting connection according to one or more embodiments of the present disclosure;

FIG. 12 is a schematic illustration of a well seat configuration according to one or more embodiments of the present disclosure;

the water pump filter comprises 1, filter materials, 2, a water pump, 3, a piston, 4, an inter-pipe joint, 5, a well pipe, 6, filter cloth, 7, a water discharge pipe, 8, a matching plate, 9, an inserting plate, 10, a nylon buckle, 11, a connecting block, 12, L-shaped connecting ribs, 13, vertical ribs, 14, a transverse plate, 15, a vertical plate, 16, a baffle, 17, transverse ribs, 18, a saw-tooth-shaped groove, 19, an annular connecting rib, 20, a well seat, 21, a rib penetrating gap, 22, an installation position, 23 and a rope penetrating groove.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected directly or indirectly through an intermediate medium, or the two components can be connected internally or in an interaction relationship, and the terms can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows:

the present invention will be described in detail with reference to fig. 1 to 12, and specifically, the structure is as follows:

the embodiment provides a tubular well structure suitable for a high-permeability alluvial stratum, which comprises a well pipe 5, filter cloth 6, filter materials 1, an inter-pipe joint 4 and a well seat 20, wherein adjacent tubular wells are connected through the inter-pipe joint 4 as shown in fig. 1, and the well seat 20 is arranged at the end part of a last tubular well 5. The filter cloth 6 wraps the outer side of the well pipe 5, the filter materials 1 are arranged on the outer side of the filter cloth 6, soil layer properties at each depth are strictly recorded in the well drilling process of the pipe well, and the corresponding filter materials 1 are respectively filled according to the distribution and the thickness of the soil layers.

The filter cloth 6 is respectively provided with different meshes and layers according to the properties of corresponding soil layers, as shown in figure 2, the filter cloth 6 is provided with nylon fasteners 10 and is tightly attached to the outer wall of the well pipe 5, and the filter cloth 6 between the adjacent well pipes 5 is tightly connected through the nylon fasteners 10. As shown in fig. 12, a rope threading groove 23 is formed at the bottom of the well seat 20 for a lifting rope to pass through for conveniently lifting the well pipe 5; the section of the stringing groove 23 is arc-shaped. The well base 20 is cylindrical as a whole, and the top of the well base is provided with a boss which can go deep into the well pipe 5, so that the tightness is improved, and silt is prevented from entering the well from the bottom of the well.

The inter-pipe joint 4 adopts a rotary hasp type joint or a clamping groove type joint, specifically, the clamping groove type joint comprises a plug board 9 and a matching board 8 which are mutually matched as shown in figure 4, the plug board 9 is fixed at the bottom end of the previous section of well pipe 5, and the matching board 8 is positioned at the top end of the next section of well pipe 5. Furthermore, the longitudinal section of the plug board 9 is T-shaped and is provided with a T-shaped extending end; the transverse section of the device is annular.

The matching plates 8 are arranged along the circumferential direction of the well pipes 5, and in the embodiment, in order to enable the adjacent well pipes 5 to be tightly matched, the longitudinal sections of the matching plates 8 are arranged into funnel-shaped open grooves which are symmetrical up and down; and the symmetrical open slots are not communicated with each other. Specifically, the mating plates 8 form side walls which are bilaterally symmetrical and have tapered tips, and no gap is left in the middle of the mating plates 8 (between adjacent tapered tips) during prefabrication. When the pipe well 5 is installed, the T-shaped extending end of the insertion plate 9 extrudes the inner wall of the matching plate 8 by using gravity, and is inserted into the matching plate 8, so that the upper and lower two sections of well pipes 5 can be tightly connected, and soil particles are effectively prevented from entering the well through gaps between the pipes.

The matching plate 8 and the inserting plate 9 are both metal plates, and in the embodiment, the matching plate 8 and the inserting plate 9 are steel plates. It will be appreciated that in other embodiments, other metal materials may be used for the mating plate 8 and the plugboard 9.

As shown in fig. 5 to 8, the swivel snap-on type joint includes a joint block 11 provided at the top end of a lower well pipe 5 and L-shaped joint bars 12 provided at the bottom end of an upper well pipe 5, a bar passing space 21 for fitting L-shaped joint bars 12 is formed at the side of the joint block 11, and L-shaped joint bars 12 are inserted into the bar passing space 21 and rotated to be fitted to the joint block 11, thereby realizing the connection of adjacent well pipes 5.

In this embodiment, four sets of swivel snap joints are provided adjacent to the articulated well pipe 5, but it is to be understood that in other embodiments, the number of swivel snap joints may be other as long as the stable fitting of the well pipe 5 can be ensured.

Specifically, as shown in fig. 11, the L-shaped connecting rib 12 comprises a transverse rib 17 and a vertical rib 13, the transverse rib 17 and the vertical rib 13 are connected to form a L-shaped structure, as shown in fig. 9-11, the connecting block 11 comprises a transverse plate 14, a vertical plate 15 and a baffle 16, the transverse plate 14 is perpendicular to the vertical plate 15, and the baffle 16 is connected to one end of the transverse plate 14 and one end of the vertical plate 15.

The pipe well 5 port is equipped with zigzag groove 18, and zigzag groove 18 is used for installing connecting block 11/L shape splice bar 12. as shown in fig. 7, the splice bar 11 is slightly less than zigzag groove 18, L shape splice bar 12 is slightly more than zigzag groove 18 to guarantee that after the hasp rotates, there is certain space between horizontal muscle 17 of L shape splice bar 12 and the diaphragm 14 of splice bar 11, avoid leading to being difficult to install and not in place to rotate because of the manufacturing error.

The connecting blocks 11 and the L-shaped connecting ribs 12 are respectively arranged at the zigzag grooves 18 of the pipe ends and are vertically connected through the vertical ribs 13 and transversely connected through the annular connecting ribs 19. when the connecting device is installed, the transverse ribs 17 pass through the rib penetrating gaps 21 and rotate to reach specified positions, the vertical ribs 13 of the L-shaped connecting ribs 12 and the vertical plates 15 of the connecting blocks 11 are located in the same vertical direction, and meanwhile, the transverse ribs 17 of the L-shaped connecting ribs 12 are tightly attached to the baffle plates 16 of the connecting blocks 11.

The welding position of the vertical rib 13 is positioned outside the vertical plate 15, is parallel to the baffle 16 and leaves a certain gap with the baffle 16, the transverse rib 17 of the L-shaped connecting rib 12 is blocked by the baffle 16 after the vertical rib 13 is connected and rotated to the position, and meanwhile, the vertical rib 13 and the vertical plate 15 outside the connecting block 13 are in a vertical direction, so that the rationality of stress is ensured.

During prefabrication, the internal joint structure of the well pipe 5 is placed on the surface of the internal mold of the well pipe 5, then the sand-free concrete is poured, the external joint structure of the well pipe 5 is welded after the mold is removed to reach certain strength, during installation, the transverse rib 17 of the L-shaped connecting rib 12 enters the connecting block 11 through the rib penetrating gap 21, and then the transverse rib 17 of the L-shaped connecting rib 12 is rotated from the installation position 22 (dotted line position) shown in fig. 11 to be attached to the baffle 16 of the connecting block 11.

The rotary hasp type joint can be used for lifting description, namely the integrity of the well pipe 5 can be passed through, and when an out-of-well silt well occurs, the rotary hasp type joint can rotate and lift the well pipe according to a specific direction to stir the out-of-well silt, so that the purpose of dredging is achieved. Meanwhile, if the well pipe 5 has the problems of deviation, inclination and the like during installation, the deviation can be corrected by a rotating and pulling method.

Example two:

the embodiment provides a tubular well precipitation construction system suitable for a high-permeability alluvial stratum, which comprises a piston well washing device and a tubular well structure, wherein the tubular well structure is provided with the piston well washing device, and the piston well washing device extends into a well pipe 5 to clean the inner wall of the well pipe 5.

As shown in figure 1, the piston well-flushing device comprises a piston 3, a water suction pump 2 and a water drainage pipe 7, wherein the water drainage pipe 7 penetrates through the piston 3 and is connected with the water suction pump 2. Specifically, as shown in fig. 3, the piston 3 is a solid structure, the upper end of the piston is a cone, the lower end of the piston is a hemisphere, so that resistance when the piston moves up and down is reduced, and a hole for the drain pipe 7 to pass through is reserved in the center of the piston 3. The piston 3 well washing method is simple and easy to implement, meets the requirement of simultaneous well washing and pollution discharge, and avoids repeated well washing caused by untimely pollution discharge, and time and labor are wasted.

Example three:

the embodiment provides a pipe well precipitation construction method suitable for a high-permeability alluvial stratum, and by adopting the pipe well precipitation construction system of the embodiment II, the construction steps are as follows: pore-forming → tube well → filling material → well flushing.

Specifically, the method comprises the following steps:

(1) a preparation stage:

and (4) ordering precipitation pipe joints which are suitable for different stratums in a distinguishing manner according to the requirements of geotechnical engineering investigation of stratums.

(2) Forming holes:

the well drilling and pore-forming process records and corrects the requirements of the investigation stratum and different well pipes. Preparing different drilling methods and different mud proportions according to different stratums; specifically, for the stratum such as soft clay and sandy soil with sand, the construction methods such as rotary drilling and spiral drilling can be adopted for pore-forming construction, for the stratum with compact pebble and gravel, the construction method of impact drilling is adopted for pore-forming construction, and for the stratum with loose pebble and gravel, reverse circulation rotary drilling is adopted for pore-forming construction;

(3) the well pipes 5 are put down according to the classification of stratum conditions:

1) and (3) installing the well base 20 and the bottom joint well pipe 5: the well base 20 blocks the well bottom to prevent the sludge at the well bottom from entering, and the hoisting rope passes through the rope penetrating groove 23 at the bottom of the well base 20 to hoist the bottom-jointed well pipe 5.

2) The pipe joints 4 are connected and the filter cloth 6 is connected: after the bottom-section well pipe 5 is lowered to a position suitable for installation of the next section well pipe 5, the second section well pipe 5 is installed, the rotary hasp type joint needs to properly lower the well pipe 5 first and then rotate to the position, and the clamping groove type joint is adopted to enter the bottom-section well pipe 5 by means of gravity and be clamped. The upper section of filter cloth 6 naturally droops, and the nylon fastener tape 10 is tightened to be tightly tied on the outer wall of the bottom-section well pipe 5, forms a certain double-layer lap joint with the filter cloth 6 of the bottom-section well pipe 5 and is sequentially installed on the top section of the well pipe 5.

(4) Filling a filter material 1:

and recording the soil layer properties of each depth in detail in the well drilling process, determining the change depth of each soil layer, and determining the particle size of the filled filter material 1 according to the soil layer properties collected in the well drilling process. Different properties of soil layers are filled with filter materials 1 with different particle sizes, and the general principle is that the smaller the soil particles, the smaller the particle size of the filter material 1 in the layer is. Under normal conditions, the medium coarse sand with good clean grade can be directly used as the filter material 1, and when the particle size of the protected soil is larger, a proper amount of clean sand heads or mung bean sand can be mixed.

And (5) washing the well by the piston 3:

when a well is washed, the water suction pump 2 is firstly put in, and the water drainage pipe 7 passes through a hole in the middle of the piston 3 and then is put in the piston 3; when the well is washed, the piston 3 moves up and down. The instantaneous negative pressure is formed when the piston 3 is lifted to bring out silt in cracks of the hole wall, the instantaneous positive pressure is formed when the piston is pressed downwards, the mud skin of the hole wall is circularly washed in such a way, the silt in the holes is separated from the hole wall and falls into water, and the water suction pump 2 is used for pumping the silt out of the well in time to avoid repeated well washing.

And (6) disease treatment:

for the tubular well adopting the rotary hasp type joint, when the silting well occurs, mud skins outside the well can be promoted to fall off in a mode of rotating and vertically lifting the tubular well in a single direction, and the service life of the tubular well is prolonged. When well position deviation or pipe well inclination and other diseases occur, the characteristic of the joint can be used for correcting deviation at any time in the installation process or the use process.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipe well structure suitable for high-permeability alluvial stratum is characterized by comprising a well pipe, wherein the outer side of the well pipe is wrapped with filter cloth, and the outer side of the filter cloth is provided with filter materials filled in layers; the adjacent well-saving pipes are connected through an inter-pipe joint, and the tail end of the bottom well-saving pipe is connected with a well seat.

2. The tubular well structure suitable for the high permeability alluvial formation of claim 1, wherein the inter-tubular joint is a snap-in joint comprising a mating plate and a mating plate that mate with each other; the mating plates can form a gap for the insertion plate to enter under the action of the insertion plate.

3. A tubular well construction suitable for use in high permeability alluvial formation according to claim 1, wherein the swivel snap-on fitting comprises a connector block disposed at the top end of the lower casing and L-shaped connector ribs disposed at the bottom end of the upper casing, the sides of the connector block forming rib-penetrating voids for engaging the L-shaped connector ribs.

4. The tubular well structure suitable for the high-permeability alluvial stratum of claim 3, wherein the L-shaped connecting ribs comprise transverse ribs and vertical ribs, the connecting block comprises a transverse plate, a vertical plate and a baffle plate, the baffle plate is connected to one end of the transverse plate and one end of the vertical plate, the transverse ribs reach a designated position through penetrating rib gaps and through rotation, the vertical ribs and the vertical plate are located in the same vertical direction, and the transverse ribs are tightly attached to the baffle plate.

5. The tubular well structure suitable for high-permeability alluvial stratum according to claim 1, wherein the filter cloth is prefabricated with nylon buckles, and the filter cloth between adjacent tubular wells is connected through the nylon buckles.

6. The tubular well structure suitable for the high-permeability alluvial formation of claim 1, wherein the upper surface of the well base is provided with a boss matched with the tubular well, and the bottom of the well base is provided with a threading groove.

7. A tube well precipitation construction system suitable for highly permeable alluvial formations, comprising a piston well washing device extending into the interior of a tube well for cleaning the inner wall of the tube well, and a tube well construction according to any of claims 1 to 6.

8. The pipe well precipitation construction system suitable for the high permeability alluvial formation of claim 7, wherein the piston well washing device comprises a piston, a water pump and a water drain pipe, and the water drain pipe is connected with the water pump through the piston.

9. The pipe well precipitation construction system suitable for the high-permeability alluvial formation is characterized in that a hole for a drain pipe to pass through is reserved in the piston, and impurities can be timely discharged in the well washing process.

10. A method for pipe well precipitation construction suitable for high permeability alluvial formation, wherein the pipe well precipitation construction system of any one of claims 7 to 9 is adopted, comprising:

piston well flushing: when a well is washed, the water pump is firstly put in, and the water drain pipe passes through the hole in the middle of the piston and then is put in the piston; the piston moves up and down when the well is washed; when the well is washed, the water pump is adopted to pump out the sewage dropping into the silt in time.