CN210712858U

CN210712858U - Dense back sparse double row pile underground structure in front

Info

Publication number: CN210712858U
Application number: CN201920989952.9U
Authority: CN
Inventors: 沈江涛; 王志军
Original assignee: Wuhan Construction Engineering Special Engineering Co Ltd
Current assignee: Wuhan Construction Engineering Special Engineering Co Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-06-09
Anticipated expiration: 2029-06-26

Abstract

The utility model discloses a preceding close back is dredged double row pile foundation ditch supporting construction, relate to the technical field of excavation supporting engineering, it includes that a plurality of intensive inserts the front row stake of establishing on the foundation ditch side slope line, the subaerial back row stake that is equipped with a plurality of intervals settings that still inserts that front row stake deviates from foundation ditch one side, back row stake also distributes along the foundation ditch side slope line, the upper end part of a plurality of front row stakes and a plurality of back row stake do not is provided with preceding crown beam and back crown beam, be provided with a plurality of even beams between preceding crown beam and the back crown beam, back row stake and back crown beam reserve when pouring and have the precipitation well that the lower extreme extends to in the front row stake lower extreme below soil layer, be provided with dewatering device in the precipitation well. The utility model discloses a dewatering device carries out the drainage to the groundwater in the infiltration dewatering well, has reduced the water pressure of tip surrounding soil layer under the front stall stake, has avoided the phenomenon that the front stall stake is soft and makes the reduction of front stall stake steadiness after the soil layer infiltration around the front stall stake as far as possible.

Description

Dense back sparse double row pile underground structure in front

Technical Field

The utility model belongs to the technical field of the technique of excavation supporting engineering and specifically relates to a preceding close back is dredged double row pile excavation supporting construction is related to.

Background

In recent years, the scale of foundation pit engineering is rapidly developed, the excavation area and the depth are increased, in addition, urban buildings are dense, peripheral pipelines are criss-crossed, and underground structural engineering is adjacent, so that the foundation pit structure is more and more complex, along with the problems that the requirement on red lines of the buildings is stricter, the construction site is more tense, the environmental effect needs to be considered and the like, a high-strength foundation pit supporting structure which is stable in structure, small in occupied space and convenient to construct is required to be developed, the double-row pile supporting structure has the advantages of being large in overall rigidity, capable of reducing the arrangement or not needing inner supports and anchor cables, convenient to construct, and capable of overcoming the problem that the construction site is tense and the like, and therefore the double-.

Chinese patent with patent publication No. CN203022007U proposes a dense back-sparse double row pile foundation pit supporting structure, which is a double row pile foundation pit supporting structure, the top of the front row of foundation pit supporting piles is provided with a crown beam, the back row of supporting piles are horizontally connected with the front row of foundation pit supporting piles through inter-pile tie beams, wherein the distance between the back row of supporting piles is 2-3 times that between the front row of supporting piles, and the length of the back row of supporting piles is less than that of the front row of supporting piles. The utility model discloses a well back row pit fender pile can form the pulling force and share the shearing force of the slope slip soil body to the stake to the front row fender pile, full play the bending resistance of pile body, improved the whole supporting capacity to the foundation ditch, reduced the deformation of excavation supporting system.

The above prior art solutions have the following drawbacks: when supporting construction strutted foundation ditch side slope, the stability of supporting construction self structure was decided supporting construction can negative and is played effective support to foundation ditch side slope, except that the influence factor of supporting construction self rigidity intensity, the firm support performance of supporting construction surrounding soil layer also led to the fact the influence to supporting construction's stability, wherein the main factor then lies in the water content in supporting construction surrounding soil layer, groundwater excessively infiltrates in the soil horizon around the fender pile, cause the soil horizon loose and soft, the fender pile rocks, then will influence supporting construction's stability certainly, and then influence supporting construction and to foundation ditch side slope's effective support.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a preceding close back of can independently precipitation is dredged double row pile underground structure.

The utility model aims at realizing through the following technical scheme:

the utility model provides a preceding close back is dredged double row pile foundation ditch supporting construction, includes a plurality of intensive front row piles of inserting and establishing on the foundation ditch side slope line, the subaerial back row pile that deviates from foundation ditch one side of front row pile still inserts and is equipped with a plurality of intervals settings that are, back row pile also distributes along the foundation ditch side slope line, and is a plurality of front row pile and a plurality of the upper end of back row pile is provided with preceding crown beam and back crown beam respectively, preceding crown beam with be provided with a plurality of tie beams between the back crown beam, back row pile with back crown beam is reserved when pouring to have the lower extreme to extend to the dewatering well in the soil layer of front row pile lower extreme below, be provided with dewatering device in the dewatering well.

By adopting the technical scheme, when the foundation pit is subjected to supporting construction, the front row piles are poured firstly, when the front row piles approach to condensation, the front crown beams are integrally poured at the upper ends of the front row piles, when the rear row piles are poured, the dewatering wells are reserved at the axes of the rear row piles, the lower ends of the dewatering wells extend into the soil layer at the lower ends of the front row piles, the rear crown beams are integrally poured at the upper ends of the rear row piles, holes communicated with the dewatering wells are reserved on the rear crown beams, and finally a plurality of connecting beams used for connecting the front crown beams and the rear crown beams are poured between the rear crown beams and the front crown beams at intervals, so that the foundation supporting structure of the double row piles is completed, the foundation pit side slope can be effectively supported without arranging anchor cables or inner supports; during foundation pit excavation, carry out the drainage operation to the groundwater that infiltrates in the precipitation well through precipitation device, reduced the water pressure of the surrounding soil layer of front row stake lower tip to the phenomenon that the front row stake steadiness reduces after having avoided front row stake surrounding soil layer infiltration as far as possible soft.

Further setting the following steps: the dewatering device comprises a dewatering pipe arranged in the dewatering well, a strainer is connected to the lower end of the dewatering pipe, a plurality of strainer holes are formed in the peripheral wall of the strainer, a submersible pump located at the lower portion of the dewatering pipe is arranged in the dewatering pipe, and the peripheral wall and the lower end of the strainer are sequentially coated with a nylon strainer and a steel wire mesh.

By adopting the technical scheme, the underground water in the soil layer on the peripheral side of the lower end of the dewatering well permeates into the strainer pipe through the strainer holes on the strainer pipe, and the submersible pump pumps out the underground water immersed into the dewatering pipe so as to reduce the water pressure in the soil layer on the peripheral side of the lower end of the dewatering well and further reduce the water pressure in the soil layer on the peripheral side of the front row pile adjacent to the dewatering well; the nylon strainer filters groundwater, prevents as far as possible that silt from permeating to the downthehole filter pore of straining blocks up, and the wire net filters the impurity of great granule and also protects the nylon stratum reticulare simultaneously to prevent that the nylon strainer is lacerated when setting up the strainer.

Further setting the following steps: and a gravel filter material is arranged at the lower end part of the downcomer in the dewatering well.

By adopting the technical scheme, the gravel filter material further performs rough filtration on the underground water permeating to the lower end of the water filter pipe, so that the in-process of the double-row pile supporting structure for supporting the foundation pit is ensured as far as possible, and the precipitation device can play an effective precipitation role.

Further setting the following steps: the gravel filter material peripheral wall is coated with a cylindrical filter material basket with an upper end opening, and the upper end face of the filter material basket is in contact with the lower end face of the downcomer.

Through adopting above-mentioned technical scheme, the drainage basket protects the rubble filter material, prevents to break away the rubble filter material when water pressure is too big in the soil layer, has guaranteed the effective filtration of rubble filter material to groundwater as far as possible.

Further setting the following steps: and a transverse tension beam for connecting the two adjacent connecting beams is also arranged between the two adjacent connecting beams.

Through adopting above-mentioned technical scheme, the horizontal tie beam is fixed a plurality of even tie beams for a plurality of even tie beams become a whole, have further strengthened double row pile supporting construction's steadiness, have improved double row pile supporting construction to the effect of strutting of foundation ditch bank protection.

Further setting the following steps: the two ends of the transverse pulling beam are close to one side of the connecting beam, and the inserting blocks are fixedly connected to the two sides of the upper end face of the middle of the connecting beam, and grooves matched with the inserting blocks in a complete inserting mode are reserved on the two sides of the upper end face of the middle of the connecting beam.

Through adopting above-mentioned technical scheme, when the inserted block at horizontal tie beam both ends and the adjacent lange's grid recess of two adjacent coupling beams were pegged graft the adaptation completely, horizontal tie beam carried out detachable fixed to two adjacent coupling beams, had both guaranteed the zonulae occludens between a plurality of coupling beams, and the reuse of horizontal tie beam of being convenient for again has reduced engineering cost.

Further setting the following steps: the length of the rear row of piles is smaller than that of the front row of piles.

Through adopting above-mentioned technical scheme, precipitation device reduces the back with row's stake surrounding soil layer water pressure, and the steadiness of row's stake and back row stake is stronger in the soil layer before, reduces the length of back row stake this moment, can be guaranteeing under the prerequisite that double row stake supporting construction effectively strutted the foundation ditch, material saving, reduction of erection time.

Further setting the following steps: and the lower end part of the rear row of piles is also provided with a weighted anchor body with the diameter 2-3 times that of the rear row of piles.

By adopting the technical scheme, the weighting anchor body can be used for increasing the dead weight of the back row pile and increasing the contact area of the back row pile and the soil body, so that the stability of the back row pile in the soil body in an inserted mode is improved.

To sum up, the utility model discloses a beneficial technological effect does:

1. when the double-row piles support the foundation pit slope, the dewatering device discharges underground water in a soil layer at the lower end part of the front row pile, so that the problem that the stability of the front row pile is reduced due to the fact that the soil layer around the front row pile is soft after water seepage is avoided as much as possible;

2. the gravel filter material, the steel wire mesh and the nylon water filter net carry out multi-pass filtration on the groundwater, so that groundwater impurities permeating into the precipitation pipe are less, and the continuous precipitation effect of the precipitation device is ensured as far as possible;

3. the transverse tie beam is connected with the plurality of connecting beams into a whole through the inserting connection of the inserting blocks and the grooves, so that the overall stability of the supporting structure is improved to a certain extent.

Drawings

Fig. 1 is a sectional view of the overall structure of the present invention;

fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Reference numerals: 1. front row piles; 2. back row piles; 3. a front crown beam; 4. a rear crown beam; 5. a tie-beam; 6. dewatering wells; 7. a downcomer pipe; 8. a water filter pipe; 9. water filtering holes; 10. a submersible pump; 11. a nylon water filter screen; 12. steel wire mesh; 13. a gravel filter material; 14. a material filtering basket; 15. transversely pulling the beam; 16. inserting a block; 17. a groove; 18. the anchor body is weighted.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses a preceding close back is dredged double row pile foundation ditch supporting construction, insert the front row stake 1 of establishing on the foundation ditch side slope line including a plurality of crowds, front row stake 1 deviates from the subaerial back row stake 2 that is equipped with a plurality of intervals settings that set up that still inserts of foundation ditch one side, interval between two adjacent back row stakes 2 is the twice of interval between two adjacent front row stakes 1, back row stake 2 also distributes along the foundation ditch side slope line, the upper end part of a plurality of front row stakes 1 and a plurality of back row stakes 2 is other integrative to be poured and has been had front crown beam 3 and back crown beam 4, back row stake 2 middle part and back crown beam 4 reserve when pouring and have the lower extreme to extend to the precipitation well 6 in the soil layer of front row stake 1 lower extreme below, precipitation well 6 and the coaxial setting of back row stake 2, be provided with the device in the precipitation well 6.

When the foundation pit is subjected to supporting construction, the front row piles 1 are poured firstly, when the front row piles 1 approach to be condensed, the front crown beams 3 are integrally poured at the upper ends of the plurality of front row piles 1, when the rear row piles 2 are poured, the dewatering wells 6 are reserved at the axes of the rear row piles 2, the lower ends of the dewatering wells 6 extend into the soil layer at the lower ends of the front row piles 1, the rear crown beams 4 are integrally poured at the upper ends of the plurality of rear row piles 2, holes communicated with the dewatering wells 6 are reserved on the rear crown beams 4, and at the moment, the foundation supporting structure of the double row piles is finished, so that the foundation pit side slope can be effectively supported without arranging anchor cables or inner supports; during excavation of the foundation pit, drainage operation is carried out on underground water permeating into the dewatering well 6 through the dewatering device so as to reduce water pressure of a surrounding soil layer of the lower end part of the front row pile 1, and therefore the phenomenon that the stability of the front row pile 1 is reduced due to the fact that the surrounding soil layer of the front row pile 1 is soft after water seepage is avoided as far as possible.

Referring to fig. 1 and 2, precipitation device is including wearing to establish precipitation pipe 7 in precipitation well 6, precipitation pipe 7 upper end salient in 4 up end of back crown beam, the lower tip coaxial weld of precipitation pipe 7 is connected with strainer 8, a plurality of strainer holes 9 have been seted up to strainer 8's perisporium, be provided with the immersible pump 10 that is located precipitation pipe 7 lower part in the precipitation pipe 7, immersible pump 10's outlet pipe extends to precipitation pipe 7 upper end outside, strainer 8 perisporium and lower extreme have nylon strainer 11 and wire net 12 through the cladding in proper order of iron wire, in precipitation well 6 in the lower tip intercommunication of precipitation pipe 7 have upper end open-ended cylindric filter material basket 14, filter material basket 14 intussuseption is filled with rubble filter material 13.

When the groundwater in the soil layer on the periphery of the lower end of the dewatering well 6 permeates into the water filter pipe 8 through the water filter holes 9 on the water filter pipe 8, the steel wire mesh 12 filters large-particle impurities and protects the nylon net layer at the same time so as to prevent the nylon water filter net 11 from being scratched when the water filter pipe 8 is arranged, the nylon water filter net 11 carries out secondary filtration on the groundwater, and silt is prevented from permeating into the water filter holes 9 to block the water filter holes 9 as far as possible; when the groundwater in the soil layer on the peripheral side of the lower end of the dewatering well 6 permeates into the water filter pipe 8 through the lower end of the water filter pipe 8, the gravel filter material 13 performs rough filtration on the groundwater permeated to the lower end of the water filter pipe 8, the water filter basket protects the gravel filter material 13, the gravel filter material 13 is prevented from being dispersed when the water pressure in the soil layer is too high, and the effective filtration of the gravel filter material 13 on the groundwater is ensured as much as possible; after the water level in the dewatering pipe 7 rises to a position where the water level exceeds the submersible pump 10, the submersible pump 10 is started to pump out the underground water immersed in the dewatering pipe 7, so that the water pressure in the soil layer around the lower end of the dewatering well 6 is reduced, the water pressure in the soil layer around the front row pile 1 adjacent to the dewatering well 6 is further reduced, and the stability of the front row pile 1 and the rear row pile 2 inserted in the soil layer is ensured as far as possible.

Referring to fig. 1, a plurality of connecting beams 5 are arranged between a front crown beam 3 and a rear crown beam 4, two ends of each connecting beam 5 are respectively connected with one front row pile 1 and one rear row pile 2, each connecting beam 5 is horizontally arranged, a transverse pulling beam 15 used for connecting two adjacent connecting beams 5 is further arranged between two adjacent connecting beams 5, inserting blocks 16 are integrally poured on one sides of two ends of each transverse pulling beam 15 close to the corresponding connecting beam 5, the cross section of each inserting block 16 is rectangular, and grooves 17 which are completely inserted and matched with the inserting blocks 16 are reserved on two sides of the upper end face of the middle of each connecting beam 5.

When the insertion blocks 16 at the two ends of the transverse tie beam 15 are completely inserted and matched with the adjacent Lange grooves 17 of the two adjacent tie beams 5, the transverse tie beam 15 detachably fixes the two adjacent tie beams 5, so that the tight connection between the plurality of tie beams 5 is ensured, the stability of the double-row pile supporting structure is enhanced, the transverse tie beam 15 can be conveniently recycled, and the construction cost is reduced.

The length of the rear row pile 2 is smaller than that of the front row pile 1, and the lower end part of the rear row pile 2 is also provided with a weighted anchor 18 with the diameter twice that of the rear row pile 2 through jet grouting. After the water pressure of a soil layer around the front row piles 1 is reduced by the dewatering device, the front row piles 1 and the rear row piles 2 are high in stability in the soil layer, the length of the rear row piles 2 is reduced, materials can be saved and the construction period can be shortened on the premise that a double-row pile supporting structure effectively supports a foundation pit; the arrangement of the weighted anchor 18 not only increases the self weight of the back row pile 2, but also increases the contact area between the back row pile 2 and the soil body, thereby improving the stability of the back row pile 2 inserted in the soil body.

The implementation principle and the beneficial effects of the embodiment are as follows:

when the foundation pit is subjected to supporting construction, the front row of piles 1 are poured firstly, when the front row of piles 1 approach to be condensed, the front crown beams 3 are poured integrally at the upper ends of the front row of piles 1, when the rear row of piles 2 are poured, the dewatering wells 6 are reserved at the axes of the rear row of piles 2, the lower ends of the dewatering wells 6 extend into the soil layer at the lower ends of the front row of piles 1, the rear crown beams 4 are poured integrally at the upper ends of the rear row of piles 2, holes communicated with the dewatering wells 6 are reserved on the rear crown beams 4, and finally a plurality of connecting beams 5 used for connecting the front crown beams 3 and the rear crown beams 4 are poured between the rear crown beams 4 and the front crown beams 3 at intervals; during the excavation of foundation ditch, carry out the drainage operation through the dewatering device to the groundwater that infiltrates in dewatering well 6, reduce the water pressure of the surrounding soil layer of front row pile 1 tip to the phenomenon that makes front row pile 1 steadiness reduce after having avoided front row pile 1 surrounding soil layer infiltration as far as possible soft.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a preceding close back is dredged double row pile foundation ditch supporting construction, includes a plurality of intensive front row piles (1) of inserting and establishing on the foundation ditch side slope line, ground that front row pile (1) deviates from foundation ditch one side still inserts and is equipped with a plurality of back row piles (2) that are the interval setting, back row pile (2) also distribute along the foundation ditch side slope line, and are a plurality of front row pile (1) and a plurality of the upper end part of back row pile (2) do not is provided with preceding crown beam (3) and back crown beam (4), preceding crown beam (3) with be provided with a plurality of even tie beam (5) between back crown beam (4), its characterized in that: and the rear row piles (2) and the rear crown beam (4) are reserved with dewatering wells (6) with the lower ends extending into the soil layer below the lower ends of the front row piles (1) during pouring, and dewatering devices are arranged in the dewatering wells (6).

2. The front dense-rear sparse double row pile foundation pit supporting structure of claim 1, wherein: the dewatering device comprises a dewatering pipe (7) arranged in a dewatering well (6), a water filter pipe (8) is connected to the lower end of the dewatering pipe (7), a plurality of water filter holes (9) are formed in the peripheral wall of the water filter pipe (8), a submersible pump (10) located on the lower portion of the dewatering pipe (7) is arranged in the dewatering pipe (7), and a nylon water filter net (11) and a steel wire net (12) are sequentially wrapped on the peripheral wall and the lower end of the water filter pipe (8).

3. The front dense-rear sparse double row pile foundation pit supporting structure according to claim 2, wherein: and a gravel filter material (13) is arranged at the lower end part of the dewatering pipe (7) in the dewatering well (6).

4. The front dense-rear sparse double row pile foundation pit supporting structure according to claim 3, wherein: the peripheral wall of the gravel filter material (13) is coated with a cylindrical filter material basket (14) with an opening at the upper end, and the upper end face of the filter material basket (14) is in contact with the lower end face of the downcomer (7).

5. The front dense-rear sparse double row pile foundation pit supporting structure of claim 1, wherein: and a transverse tension beam (15) for connecting the two adjacent connecting beams (5) is also arranged between the two adjacent connecting beams (5).

6. The front dense-rear sparse double row pile foundation pit supporting structure according to claim 5, wherein: the two ends of the transverse tie beam (15) are close to one side of the connecting beam (5) and are fixedly connected with the inserting blocks (16) in an integrated mode, and grooves (17) matched with the inserting blocks (16) in a complete inserting mode are reserved on the two sides of the upper end face of the middle of the connecting beam (5).

7. The front dense-rear sparse double row pile foundation pit supporting structure of claim 1, wherein: the length of the rear row of piles (2) is smaller than that of the front row of piles (1).

8. The front dense-rear sparse double row pile foundation pit supporting structure according to claim 7, wherein: the lower end part of the back row pile (2) is further provided with a weighted anchor body (18) with the diameter 2-3 times that of the back row pile (2).