CN216839467U

CN216839467U - Integrated prefabricated tubular pile structure for deep foundation pit supporting and dewatering

Info

Publication number: CN216839467U
Application number: CN202123125216.5U
Authority: CN
Inventors: 何蕃民; 徐建骁; 邓安; 李艳; 胥攀
Original assignee: China MCC5 Group Corp Ltd
Current assignee: China MCC5 Group Corp Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-06-28
Anticipated expiration: 2031-12-14

Abstract

The utility model belongs to the technical field of foundation ditch precipitation, a integral type precast tubular pile structure of deep basal pit support and precipitation is disclosed, in order to solve current deep basal pit support and deep basal pit precipitation well construction alone and the engineering cost who exists big and the problem of construction cycle length. The utility model discloses a concrete pipe pile, concrete pipe pile's lower extreme is connected with the steel filter tube, a plurality of filtration pores have been seted up on the steel filter tube, the steel filter tube has set a tub mechanism of sealing, tub mechanism of sealing is including the solid fixed cylinder that is the tube-shape, gu fixed cylinder is provided with a plurality of mounting grooves, install many sliders in the mounting groove, the inside wall of slider can pass the mounting groove and extend into the inner chamber of solid fixed cylinder, install the end cap of a plurality of filtration pore mutual adaptations with on the steel filter tube on the slider. The utility model discloses it is integrative to collect deep basal pit support and deep basal pit precipitation well construction, greatly reduced deep basal pit support and deep basal pit precipitation's construction cost and construction cycle.

Description

Integrated prefabricated tubular pile structure for deep foundation pit supporting and dewatering

Technical Field

The utility model belongs to the technical field of the foundation ditch precipitation, concretely relates to integral type precast tubular pile structure of deep basal pit support and precipitation.

Background

The foundation pit dewatering refers to dewatering work performed for ensuring that the foundation pit can be constructed under a dry condition and preventing slope instability, foundation pit sand flowing, pit bottom uplift, pit bottom piping and foundation bearing capacity reduction when the foundation pit is excavated and underground water level is higher than the excavation bottom surface.

The main modes of foundation pit dewatering are as follows: open ditch with water collecting well dewatering, light well point dewatering, jet well point dewatering, electroosmosis well point dewatering, deep well point dewatering, etc. For deep foundation pits, deep well points are generally adopted for precipitation. Well point dewatering is that before the foundation ditch excavation, construct the precipitation well of certain quantity in the foundation ditch catazhou, set up well casing and chimney filter in the precipitation well, utilize pumping equipment to take out the groundwater in the well, the main flow of well point dewatering is: well point measurement and positioning, well mouth excavation, installation of a casing drill, pore formation, well casing and filter pipe placement, backfill of a gap between the filter pipe and the well wall and formation of a filter layer, well flushing and a lower water discharge pump in the well casing.

The pipe piles are classified into prestressed concrete pipe piles (PC pipe piles), prestressed concrete thin-wall pipe piles (PTC pipe piles) and prestressed high-strength concrete pipe piles (PHC pipe piles) according to the strength grade and wall thickness of concrete. The concrete strength of the PC pile is not lower than that of C50 concrete, the strength grade of the PTC pipe pile is not lower than that of C60, and the strength grade of the PHC pile is not lower than that of C80. The PC piles and the PTC piles are generally maintained by normal pressure steam, and can be driven after 28 days. And the PHC pile is subjected to autoclave steam curing after demoulding, and the concrete strength grade reaches C80 and only needs three or four days from forming to using after the steam curing is carried out at about 180 ℃ under 10 atmospheric pressure.

When the geological conditions are poor and the bearing capacity of the foundation is small, one pipe pile needs to be driven into the ground, the weight of the upper building is transmitted to the soil layer with high bearing capacity on the lower layer through the pipe pile, and meanwhile, the weight of the upper building is supported by the friction force between the pipe pile and the surrounding soil. Meanwhile, the supporting piles of the foundation pit generally adopt drilled piles, reinforced mixing piles and the like, but the pile forming time is long due to the special property of the soft soil stratum, so that the whole foundation pit supporting construction period is influenced, and the tubular piles have the characteristic of high pile forming speed, so the tubular piles are widely applied to supporting of the foundation pit.

Therefore, the deep foundation pit support and the deep foundation pit dewatering are independently and separately carried out, and the method has the problems of high manufacturing cost and long construction period.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve current deep basal pit and strut and deep basal pit precipitation well and be under construction alone and the problem that the engineering cost that exists is big and the construction cycle is long, and provide a deep basal pit struts and the integral type precast tubular pile structure of precipitation, it is integrative to collect deep basal pit and strut and deep basal pit precipitation well construction, greatly reduced deep basal pit struts and the construction cost and the construction cycle of deep basal pit precipitation.

For solving the technical problem, the utility model discloses the technical scheme who adopts is:

the utility model provides a prefabricated tubular pile structure of integral type of deep basal pit support and precipitation, a serial communication port, include along the peripheral setting of foundation ditch and through hitting the concrete pipe pile in beating or the soil layer of impressing, concrete pipe pile's lower extreme welded connection has the steel filter tube, a plurality of filtration pores have been seted up on the steel filter tube, the steel filter tube has set a tube sealing mechanism, tube sealing mechanism is including the solid fixed cylinder that is the tube-shape, the solid fixed cylinder is provided with a plurality of mounting grooves that link up each other along vertical direction setting and with the inner chamber of solid fixed cylinder, install many sliders in the mounting groove, the inside wall of slider can pass the mounting groove and extend into the inner chamber of solid fixed cylinder, install the end cap of a plurality of filtration pores mutual adaptations with on the steel filter tube on the slider, the internally mounted of solid fixed cylinder has the removal post, thereby can slide in the removal post removes along solid fixed cylinder removal in can with the slider contact and drive the mounting groove and slide so that end cap and steel filter in the mounting groove The filtering holes of the pipes are clamped or separated from each other.

In some embodiments, the steel filter tube has an outer diameter less than or equal to the outer diameter of the concrete pipe pile.

In some embodiments, the lower end of the steel filter tube is closed and has a pointed end.

In some embodiments, a return spring for abutting against the sliding block is installed in the installation groove.

In some embodiments, the inner side surface of the sliding block is an inclined surface, so that the length of the upper end of the sliding block extending into the inner cavity of the fixed cylinder is less than the length of the lower end of the sliding block extending into the inner cavity of the fixed cylinder.

In some embodiments, the outer circumference of the moving column is provided with a wedge-shaped surface corresponding to the position of the sliding block and fitting with the inclined surface of the sliding block.

In some embodiments, a cushion block which is matched with the length of the installation groove and can be detached is arranged in the installation groove.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses an integral type precast tubular pile structure of deep basal pit support and precipitation drills in advance in the use in the periphery of foundation ditch earlier and gets the stake hole, then links together concrete pipe pile and steel filter tube, then installs the shutoff mechanism in the steel filter tube, and move the removal post in the solid fixed cylinder, make the slider that moves the post extrusion mounting inslot, make the slider extend outward make the end cap enter into the filter hole in the steel filter tube, thereby block up the filter hole, prevent that the soil body of tubular pile (concrete tubulose and steel filter tube) from entering into the filter hole of steel filter tube in the process of pushing down; then the concrete pipe pile and the steel filter pipe are placed into the pile hole together in a knocking or pressing mode, along with the downward placement of the concrete pipe pile and the steel filter pipe, a new concrete pipe pile is gradually spliced above the concrete pipe pile, and the pile hole is continuously pressed downwards until the set depth is reached (the upper end of the steel filter pipe is positioned below the bottom surface of the foundation pit). Then upwards draw the removal post through the towed mode of rope, make to remove post and slider alternate segregation (thereby make the filtration pore be in the state of opening, groundwater enters into the inside of steel filter tube and gathers, be convenient for take groundwater out the purpose that reaches precipitation through pipeline and water pump), the slider resets under reset spring's effect and makes the end cap break away from and make the end cap be located the mounting groove of solid fixed cylinder in the filtration pore from the filtration pore of steel filter tube, then extract the solid fixed cylinder from concrete tubular pile and steel filter tube again, the installation of the downthehole tubular pile of next stake is carried out repeatedly.

Compared with the prior art, the utility model discloses collect deep excavation supporting and deep basal pit dewatering as an organic whole, realized the effect that a pipe is multi-purpose, greatly reduced deep basal pit supporting and deep basal pit dewatering's construction cost and construction cycle. More importantly, because the tubular pile (concrete tubulose and steel filter tube) sets up along the foundation ditch periphery, it is nearer apart from the position of foundation ditch to compare in prior art foundation ditch arrangement's precipitation well apart from the position of foundation ditch, consequently has the effectual characteristics of precipitation. And because precipitation well crowd is far away from the foundation ditch position among the prior art, the influence scope of every precipitation well is limited in addition, leads to the regional precipitation effect of foundation ditch bottom relatively poor (thereby make the foundation ditch bottom moist, still need set up a plurality of escape canals and draw water the operation). In the utility model, because the tubular piles (the concrete tubular pile and the steel filter pipe) are arranged along the periphery of the foundation pit, each tubular pile (the concrete tubular pile and the steel filter pipe) can radiate the bottom of the foundation pit (namely the precipitation influence area of each tubular pile can cover the bottom of the foundation pit), thereby improving the precipitation effect of the foundation pit; and the utility model discloses because the tubular pile sets up along the periphery of foundation ditch (the distance apart from the foundation ditch is nearer promptly), the region of tubular pile precipitation influence is only the region and every tubular pile influence scope sum of foundation ditch, and the region that falls promptly also is along the peripheral part of foundation ditch, can greatly reduced to the peripheral former soil body of foundation ditch (the peripheral region of not digging of foundation ditch promptly).

And, the utility model discloses in the use, directly utilize the concrete pipe pile of current production, do not need redesign and make concrete pipe pile, can not influence concrete pipe pile's structure and intensity yet. Simultaneously the utility model discloses a shutoff mechanism has the installation and dismantles swift characteristics, can further improve the tubular pile and implant the downthehole efficiency of stake.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural view of a cross-sectional view of the plugging mechanism of the present invention;

fig. 3 is a schematic top view structure diagram of an embodiment of the moving column of the present invention;

the mark in the figure is: 1. concrete pipe pile, 11, stainless steel plate, 2, steel filter tube, 21, bottom plate, 3, shutoff mechanism, 31, fixed cylinder, 32, end cover, 33, mounting groove, 34, slider, 35, end cap, 36, removal post, 361, sand grip, 37, reset spring, 38, lug, 39, stay cord, 310, through-hole.

Detailed Description

The present invention will be further described with reference to the following examples, which are only some, but not all, of the examples of the present invention. Based on the embodiments in the present invention, other embodiments used by those skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

With the attached drawings, the integrated precast tubular pile structure for deep foundation pit supporting and dewatering comprises a concrete tubular pile 1 which is arranged along the periphery of a foundation pit and is beaten or pressed into a soil layer, wherein a stainless steel plate 11 is arranged at the lower end of the concrete tubular pile 1, and the middle part of the stainless steel plate 11 is provided with a through hole with the same inner diameter as the concrete tubular pile; the stainless steel plate 11 is used for connecting the concrete pipe piles 1 adjacent to each other up and down in a welding manner, that is, the stainless steel plate 11 itself belongs to a part of the concrete pipe pile 1. The upper end of the concrete pipe pile 1 is also provided with a stainless steel plate 11, so that the concrete pipe pile 1 above the stainless steel plate can be spliced conveniently; the lower end of the concrete pipe pile is welded with a steel filter pipe 2, that is, the concrete pipe pile 1 and the steel filter pipe 2 are welded together through a stainless steel plate 11; the steel filter pipe 2 is provided with a plurality of filter holes 21, preferably, the steel filter pipe 2 is made of stainless steel, so as to improve the corrosion resistance of the steel filter pipe 2. In some embodiments, the steel filter tube 2 is further provided with an anti-corrosion layer to further improve the anti-corrosion performance of the steel filter tube 2. The steel filter pipe 2 is provided with a pipe sealing mechanism 3 which comprises a cylindrical fixed cylinder 31, the fixed cylinder 31 is provided with a plurality of mounting grooves 33 which are arranged along the vertical direction and mutually communicated with the inner cavity of the fixed cylinder, a plurality of sliding blocks 34 are arranged in the mounting groove 33, the inner side surfaces of the sliding blocks 34 can penetrate through the mounting groove 33 and extend into the inner cavity of the fixed cylinder 31, that is to say, one side of the sliding block 34 closer to the fixed cylinder 31 can pass through the mounting groove 33 and extend into the inner cavity of the fixed cylinder 31, a plurality of plugs 35 which are matched with the filtering holes 21 on the steel filtering pipe 2 are arranged on the sliding block 34, the fixed cylinder 31 is internally provided with a movable column 36, and the movable column 36 can contact with the sliding block 34 and drive the sliding block 34 to slide in the mounting groove 33 when moving along the fixed cylinder 31, so that the plug 35 and the filter hole 21 of the steel filter pipe 2 can be clamped or separated from each other. The fixed cylinder 31 is further provided with a through hole 310 corresponding to the plug 35, so that the plug 35 can extend out of the fixed cylinder 31 and be inserted into the filtering hole of the steel filtering pipe 2 after being extruded.

Preferably, the periphery of the plug 35 is coated with a buffer layer to prevent the plug 35 from damaging the anticorrosive coating on the steel filter tube 2 in the movement process. Preferably, the end of the plug 35 away from the axis of the fixed cylinder 31 is hemispherical so as to have a guiding function.

In some embodiments, the outer diameter of the steel filter pipe 2 is less than or equal to the outer diameter of the concrete pipe pile 1, so that gravel is filled between the steel filter pipe 2 and the pile hole, and groundwater is filtered and impurities are removed through the gravel.

In some embodiments, the lower end of the steel filter tube 2 is a closed end and has a pointed end, and preferably, the lower end of the steel filter tube 2 is provided with a bottom plate 21, and the bottom plate 21 is in a truncated cone shape with a large upper end and a small lower end.

In some embodiments, a return spring 37 for abutting against the sliding block 34 is installed in the installation groove 33, the sliding block 34 can be reset through the action of the return spring 37, and when the sliding block 34 does not have the extrusion action of the moving column 36, the plug 35 can be accommodated in the fixed cylinder 31, so that the fixed cylinder 31 can be conveniently taken out of the pipe pile (the concrete pipe pile 1 and the steel filter pipe 2).

In some embodiments, the inner side surface of the sliding block 34 is an inclined surface, so that the length of the upper end of the sliding block 34 extending into the inner cavity of the fixed cylinder 31 is less than the length of the lower end of the sliding block extending into the inner cavity of the fixed cylinder, and the outer circumference of the moving column 36 is provided with a wedge-shaped surface corresponding to the position of the sliding block 34 and fitting with the inclined surface of the sliding block 34. Wherein, with reference to fig. 1, the wedge surface can be directly disposed on the outer circumference of the moving column 36. Referring to fig. 3, in some embodiments, the outer circumference of the moving column 36 is provided with a protrusion 361 corresponding to the position of the slider, and the wedge surface is provided on the protrusion 361.

In some embodiments, a removable spacer is provided in the mounting groove 33, the length of the mounting groove 33 being adapted to the length of the mounting groove. Wherein, can change slider 34 through setting up the cushion and can slide distance in mounting groove 33 to change end cap 35 and can extend the distance of a fixed section of thick bamboo 31, so that be applicable to the steel filter tube 2 of different wall thicknesses, with further improvement the utility model discloses an application range can use to the steel filter tube 2 of different wall thicknesses.

In some embodiments, the end cap 32 is detachably connected to the upper end of the fixed cylinder 31, and after the slider and the return spring are mounted in the mounting groove 33, the end cap 32 is used for sealing, and a through hole for the mobile column to pass through is formed in the middle of the end cap 32, so that the upper end of the mobile column 36 can extend out of the end cap.

Preferably, the upper end of the movable column 36 is provided with a lifting lug, so that the movable column 36 can be pulled out from the tubular pile (concrete tubular pile and steel filter pipe) by ropes and the like, the movable column 36 can not extrude the sliding block 34, and the plug 35 and the filter hole 21 on the steel filter pipe 2 can be separated from each other.

Preferably, the upper end of the movable post 36 is connected to the end cap 32 by a pull cord 39 or a wire rope, so that the fixed cylinder 31 and the movable post 36 are integrally connected to each other when the movable post 36 is pulled out.

Preferably, the outer diameter of the fixing cylinder 31 is slightly smaller than the inner diameter of the concrete pipe pile 1, so that the fixing cylinder is convenient to take out, and the disassembly efficiency is further improved.

The utility model discloses an integral type precast tubular pile structure of deep basal pit support and precipitation drills in advance in the use in the periphery of foundation ditch earlier and gets the stake hole, then links together concrete pipe pile and steel filter tube, then installs the shutoff mechanism in the steel filter tube, and move the removal post in the solid fixed cylinder, make the slider that moves the post extrusion mounting inslot, make the slider extend outward make the end cap enter into the filter hole in the steel filter tube, thereby block up the filter hole, prevent that the soil body of tubular pile (concrete tubulose and steel filter tube) from entering into the filter hole of steel filter tube in the process of pushing down; then the concrete pipe pile and the steel filter pipe are placed into the pile hole together in a knocking or pressing mode, along with the placement of the concrete pipe pile and the steel filter pipe, a new concrete pipe pile is gradually spliced above the concrete pipe pile, and the pile hole is continuously pressed downwards until the set depth is reached (the upper end of the steel filter pipe is positioned below the bottom surface of the foundation pit). Then upwards draw through the towed mode of rope and remove the post, make to remove post and slider alternate segregation (thereby make the filtration pore be in the state of opening, groundwater enters into the inside of steel filter tube and gathers, be convenient for take groundwater out the purpose that reaches precipitation through pipeline and water pump), the slider resets under reset spring's effect and makes the end cap break away from and make the end cap be located the mounting groove of solid fixed cylinder from the filtration pore of steel filter tube, then extract solid fixed cylinder from concrete pipe pile and steel filter tube in again, the installation of the downthehole tubular pile of next stake is carried out repeatedly.

Claims

1. The utility model provides a prefabricated tubular pile structure of integral type of deep basal pit support and precipitation, its characterized in that includes along the peripheral setting of foundation ditch and through hitting the concrete pipe pile in the soil layer of impressing, concrete pipe pile's lower extreme welded connection has the steel filter tube, a plurality of filtration pores have been seted up on the steel filter tube, the steel filter tube has set the tube sealing mechanism, the tube sealing mechanism is including the solid fixed cylinder that is the tube-shape, gu the fixed cylinder is provided with a plurality of vertical direction settings of edge and the mounting groove that link up each other with the inner chamber of solid fixed cylinder, install many sliders in the mounting groove, the inside wall of slider can pass the mounting groove and extend into the inner chamber of solid fixed cylinder, install the end cap of a plurality of filtration pores mutual adaptations with on the steel filter tube on the slider, gu the internally mounted of fixed cylinder has the removal post, thereby remove the post along solid fixed cylinder in can with the removal can with the slider contact and drive the slider in sliding of solid fixed cylinder make end cap and steel mounting groove slide with the steel end cap and steel The filtering holes of the filtering pipes are clamped or separated from each other.

2. The integrated precast tubular pile structure for deep foundation pit support and precipitation according to claim 1, wherein the outer diameter of the steel filter pipe is less than or equal to the outer diameter of the concrete tubular pile.

3. The integrated precast tubular pile structure for deep foundation pit support and precipitation according to claim 1, wherein the lower end of the steel filtering pipe is a closed end and has a pointed end.

4. The integrated precast tubular pile structure for deep foundation pit supporting and dewatering according to claim 1, wherein a return spring for abutting against the sliding block is installed in the installation groove.

5. The integrated precast tubular pile structure for deep foundation pit supporting and dewatering according to any one of claims 1 to 4, wherein the inner side surface of the sliding block is an inclined surface so that the length of the upper end of the sliding block extending into the inner cavity of the fixed cylinder is smaller than the length of the lower end of the sliding block extending into the inner cavity of the fixed cylinder.

6. The integrated precast tubular pile structure for deep foundation pit supporting and dewatering according to claim 5, wherein a wedge-shaped surface corresponding to the slide block and attached to the inclined surface of the slide block is arranged on the outer circumference of the movable column.

7. The integrated precast tubular pile structure for deep foundation pit support and precipitation according to claim 1, wherein a cushion block which is mutually adaptive to the length of the installation groove and is detachable is provided in the installation groove.