CN113882389A - Deep foundation pit supporting structure and construction method thereof - Google Patents
Deep foundation pit supporting structure and construction method thereof Download PDFInfo
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- CN113882389A CN113882389A CN202111030570.1A CN202111030570A CN113882389A CN 113882389 A CN113882389 A CN 113882389A CN 202111030570 A CN202111030570 A CN 202111030570A CN 113882389 A CN113882389 A CN 113882389A
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- 238000010276 construction Methods 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
- 239000002689 soil Substances 0.000 claims abstract description 78
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 238000004873 anchoring Methods 0.000 claims description 78
- 230000000670 limiting effect Effects 0.000 claims description 43
- 230000002787 reinforcement Effects 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 12
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000004575 stone Substances 0.000 description 13
- 238000001914 filtration Methods 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 5
- 239000012466 permeate Substances 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
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Abstract
The application relates to a deep foundation pit supporting structure and a construction method thereof, wherein the deep foundation pit supporting structure comprises a supporting plate and a supporting mechanism, wherein the supporting plate is used for being attached to the side wall of a foundation pit to support the foundation pit; be provided with many aqueducts in the backup pad, the one end and the backup pad of aqueduct are connected, the other end extends in the direction that deviates from the backup pad to foundation ditch lateral wall soil layer, and the aqueduct is kept away from the height that highly is not less than aqueduct and is close to backup pad one end of backup pad one end, run through on the aqueduct pipe wall and seted up a plurality of guiding water holes, the guiding water hole distributes in the first half of aqueduct, the one end that the backup pad was kept away from to the aqueduct is sealed, the one end that the aqueduct is close to the backup pad runs through backup pad and tip and link up. This application has and discharges unnecessary moisture in order to reduce the pressure of the pit wall soil body to supporting construction in the pit wall soil layer of foundation ditch, guarantees the effect of long-term stability of foundation ditch supporting construction.
Description
Technical Field
The application relates to the field of foundation pit supporting technology, in particular to a deep foundation pit supporting structure and a construction method thereof.
Background
The foundation pit support is a retaining, reinforcing and protecting measure adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit. Common foundation pit supporting modes include row pile supporting, underground continuous wall supporting, spray anchor supporting or supporting by combining a plurality of supporting modes, and the like, and generally a proper supporting mode can be selected according to the actual condition of a foundation pit.
In long-time work progress, the infiltration of rainwater, surface water, construction water can make foundation ditch pit wall soil layer water content rise to lead to foundation ditch pit wall soil body to the pressure increase of supporting construction, make foundation ditch supporting construction take place to warp easily, and how to discharge the pressure with the reduction pit wall soil body with surplus moisture in the foundation ditch pit wall soil layer is the technological problem that needs to solve at present urgently.
Disclosure of Invention
In order to discharge redundant water in a pit wall soil layer of a foundation pit so as to reduce the pressure of the pit wall soil body on a supporting structure, the application provides a deep foundation pit supporting structure and a construction method thereof.
On the one hand, the application provides a deep basal pit supporting construction, adopts following technical scheme:
a deep foundation pit supporting structure comprises a supporting plate and a supporting mechanism, wherein the supporting plate is used for being attached to the side wall of a foundation pit to support the foundation pit, and the supporting mechanism is used for supporting the supporting plate;
the supporting plate is provided with a plurality of water guide pipes, one end of each water guide pipe is connected with the supporting plate, the other end of each water guide pipe extends into a soil layer on the side wall of the foundation pit along the direction deviating from the supporting plate, the height of one end of each water guide pipe is not lower than that of the corresponding supporting plate, a plurality of water guide holes are formed in the wall of each water guide pipe in a penetrating mode, the water guide holes are distributed in the upper half portion of each water guide pipe, the end, far away from the supporting plate, of each water guide pipe is sealed, and one end, close to the supporting plate, of each water guide pipe penetrates through the corresponding supporting plate and the end portion of each water guide pipe.
By adopting the technical scheme, the supporting plate is attached to the side wall of the foundation pit and supported by the supporting mechanism, so that the side wall of the foundation pit is supported; through the arrangement of the water guide pipe, the water guide pipe is inserted into a soil layer of the side wall of the foundation pit, and the water guide hole is formed in the water guide pipe, so that when rainwater and the like permeate into the soil layer of the side wall of the foundation pit, water permeates into the water guide pipe through the water guide hole and is discharged from one end, close to the supporting plate, of the water guide pipe, and therefore the excessive water in the soil layer of the side wall of the foundation pit is discharged, the supporting structure is prevented from being deformed due to the fact that the pressure of the soil body of the side wall of the foundation pit on the supporting structure is too large as far as possible, and the long-term stability of the supporting structure of the foundation pit is guaranteed.
Preferably, the part of the water guide pipe located in the foundation pit soil layer is coated with a filter screen at the outer side, and the aperture of the filter screen is smaller than that of the water guide hole.
Through adopting above-mentioned technical scheme, set up the filter screen and be used for preventing earth etc. to get into in the aqueduct and block up the aqueduct, make the aqueduct play the function of unnecessary moisture in the foundation ditch lateral wall soil layer of discharge for a long time.
Preferably, the part that the aqueduct is arranged in the foundation ditch soil layer is equipped with steel reinforcement cage in the outside cover, the filter screen is located in the steel reinforcement cage, the steel reinforcement cage with it has the graded rubble filter layer to fill between the filter screen, the minimum particle diameter of graded rubble filter layer is greater than the aperture of filter screen, the maximum particle diameter of graded rubble filter layer is less than the aperture of steel reinforcement cage.
By adopting the technical scheme, the graded broken stone filtering layer is coated outside the water guide pipe, soil and the like are further prevented from entering the water guide pipe to block the water guide pipe through the graded broken stone filtering layer, meanwhile, the graded broken stone filtering layer can prevent soil fine particles from being brought into the water guide pipe to be washed away along with the flow of water in a soil layer, large gaps in the soil layer are avoided as far as possible, and the stability of a soil layer structure is ensured; the arrangement of the reinforcement cage plays a role in protecting the water guide pipe on one hand, so as to prevent the water guide pipe from deforming under the pressure of the soil layer as much as possible; on the other hand, the reinforcement cage plays a role in binding the graded broken stone filter layer, so that the graded broken stone filter layer is stably coated outside the water guide pipe, and a good filtering effect is achieved.
Preferably, the height of one end of the water guide pipe, which is far away from the supporting plate, is higher than the height of one end of the water guide pipe, which is close to the supporting plate.
By adopting the technical scheme, water permeating into the water guide pipe can smoothly pass through one end of the supporting plate through the water guide pipe to be discharged.
Preferably, the arrangement density of the water guide pipes is gradually increased from the bottom of the foundation pit to the top of the foundation pit.
By adopting the technical scheme, the density of the water guide pipes arranged in the foundation pit soil layer close to the top is higher, the drainage of the water guide pipe group at the top is faster, and a large amount of water is drained away at the top of the foundation pit in the process of permeating water from top to bottom, so that less water permeates into the soil layer at the bottom of the side wall of the foundation pit, and even if the rising amplitude of the water content of the whole soil layer at the side wall of the foundation pit is smaller, the pressure change amplitude borne by the supporting plate is smaller, the possibility of deformation of the supporting structure is reduced, and the stability of the supporting structure is improved; and the number of the water guide pipes can be reduced, the construction cost is reduced, and the construction efficiency is improved.
Preferably, the supporting mechanism comprises an anchoring rod for anchoring the supporting plate on the side wall of the foundation pit, the anchoring rod is perpendicular to the supporting plate and penetrates through the supporting plate and is inserted into the soil layer, an anchoring plate attached to one side, far away from the side wall of the foundation pit, of the supporting plate is arranged at one end, close to the supporting plate, of the anchoring rod, and a limiting part used for limiting the anchoring rod to move relative to the soil layer in the soil layer along the axial direction is arranged on the anchoring rod.
Through adopting above-mentioned technical scheme, the anchor pole inserts in the lateral wall soil layer of foundation ditch with the backup pad anchor on the lateral wall of foundation ditch to setting up through the locating part improves the anchor effect of anchor pole, improves the fixed effect of backup pad, makes the backup pad play stable support effect to the lateral wall of foundation ditch.
Preferably, the limiting member comprises a limiting rod slidably arranged on the outer wall of the anchoring rod, the axis of the limiting rod is intersected with the axis of the anchoring rod, the outer wall of the anchoring rod is provided with a mounting hole for the limiting rod to penetrate through in a sliding way, the anchoring rod is internally provided with a cylindrical cavity which is coaxial with the anchoring rod, the mounting hole is communicated with the cavity, the length of the limiting rod is greater than that of the mounting hole, a driving block coaxial with the anchoring rod is arranged in the cavity, the diameter of the driving block is consistent with that of the cavity, the driving block is in threaded assembly with the anchoring rod, one end of the driving block is set to be conical, one end of the limiting rod is abutted to the conical inclined plane of the driving block, one end of the cavity close to the supporting plate is communicated, and the driving block is coaxially connected with a driving rod extending out of the cavity.
By adopting the technical scheme, when the anchoring rod is inserted into a soil layer on the side wall of the foundation pit, the limiting rod is enabled to slide to the mounting hole without protruding, so that the anchoring rod can be conveniently inserted into the soil layer, after the anchoring rod is inserted into the soil layer, the driving block is enabled to rotate by rotating the driving rod outside the foundation pit, the driving block is in threaded assembly with the anchoring rod, the driving block is enabled to move axially along the anchoring rod when rotating, the end part of the limiting rod is abutted against the conical surface of the driving block, the limiting rod is enabled to slide outwards the mounting hole when the driving block moves, even if the limiting rod is inserted into the soil layer around the anchoring rod, the limiting effect on the anchoring rod is achieved by inserting the limiting rod into the soil layer, the anchoring rod is enabled to be difficult to slide axially along the anchoring rod, the anchoring effect of the anchoring rod is improved, namely, the installation stability of the supporting plate is improved, and the stability of supporting the side wall of the foundation pit is improved.
Preferably, the supporting mechanism further comprises a bottom plate attached to the bottom of the foundation pit, the bottom plate is fixed to the bottom of the foundation pit through a plurality of anchor rods, an inclined strut is arranged between the bottom plate and the supporting plate, and two ends of the inclined strut are respectively fixed to the bottom plate and the supporting plate.
Through adopting above-mentioned technical scheme, the pressure that the lateral wall of foundation ditch produced the backup pad passes through the diagonal brace and transmits to the bottom plate on, further transmits to foundation ditch bottom soil layer and on the stock for the backup pad is more stable to the support of lateral wall of foundation ditch, and the support effect is better, improves excavation supporting structure's effect of strutting.
Preferably, one end of the anchoring rod far away from the supporting plate is provided with a tip.
Through adopting above-mentioned technical scheme, be convenient for insert the foundation ditch lateral wall soil layer with the anchor rod, improve the efficiency of construction.
On the other hand, the application also provides a construction method of the deep foundation pit supporting structure, which comprises the following steps:
a. construction of a water guide pipe: excavating a hole for installing the water guide pipe on the side wall of the foundation pit according to a construction drawing, and installing the water guide pipe in the hole;
b; installing a support plate: enabling a plurality of water guide pipes to penetrate through the supporting plate, and attaching the supporting plate to the wall of the foundation pit;
c. and (3) installation of an anchoring rod: inserting the anchoring rod into a soil layer on the side wall of the foundation pit through the supporting plate;
d. mounting a bottom plate: attaching a bottom plate to the bottom of the foundation pit, and inserting an anchor rod into a soil layer at the bottom of the foundation pit through the bottom plate;
e. installing an inclined strut: and a diagonal brace is arranged between the bottom plate and the support plate.
By adopting the technical scheme, the whole process does not need pouring construction, the whole construction scheme is simple, and the construction efficiency is high.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the supporting plate is attached to the side wall of the foundation pit and matched with the supporting mechanism to support the side wall of the foundation pit, and through the arrangement of the water guide pipe, redundant water in a soil layer of the side wall of the foundation pit permeates into the water guide pipe through the water guide hole and is discharged from one end, close to the supporting plate, of the water guide pipe, so that the redundant water in the soil layer of the side wall of the foundation pit is discharged, the deformation of the supporting structure due to the overlarge pressure of a soil body of the pit wall of the foundation pit on the supporting structure is avoided as far as possible, and the long-term stability of the supporting structure of the foundation pit is ensured;
2. through the arrangement of the reinforcement cage, the graded broken stone filtering layer and the filter screen, soil and the like are prevented from entering the water guide pipe to block the water guide pipe, so that the water guide pipe has the function of discharging redundant water in a soil layer on the side wall of the foundation pit for a long time, and meanwhile, fine particles of a soil body can be prevented from being brought into the water guide pipe along with the flow of water in the soil layer to be washed away, so that larger gaps in the soil layer are avoided as far as possible, and the stability of the structure of the soil layer is ensured;
3. through the setting of anchor pole and gag lever post, the anchor pole inserts back in the soil layer, plays the limiting displacement to the anchor pole in inserting anchor pole surrounding soil layer through the gag lever post, improves the stability of anchor pole in the soil layer to improve the anchor effect to the bracing piece, make the backup pad play stable support to the foundation ditch lateral wall.
Drawings
Fig. 1 is a schematic diagram of the supporting structure in the embodiment after the construction in the foundation pit is completed;
fig. 2 is a schematic structural view of the supporting structure in this embodiment;
FIG. 3 is a schematic structural view of the anchor rod in the present embodiment;
FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic structural view of the water guide duct in the present embodiment;
fig. 6 is a schematic view of an assembly structure of the reinforcement cage, the screen and the water guide pipe in this embodiment.
Reference numerals: 1. a support plate; 2. a support mechanism; 21. a base plate; 22. an anchor rod; 221. a top plate; 23. a diagonal brace; 231. a fixed block; 24. an anchoring rod; 241. mounting holes; 242. a cavity; 25. an anchoring plate; 26. a limiting rod; 27. a drive block; 28. a drive rod; 3. a water conduit; 31. a water guide hole; 4. filtering with a screen; 5. a reinforcement cage; 6. a connecting plate.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the embodiment of the application discloses a deep foundation pit supporting structure, which comprises a supporting plate 1 and a supporting mechanism 2, wherein the supporting plate 1 is used for being attached to the side wall of a foundation pit to support the side wall of the foundation pit; the supporting mechanism 2 comprises a bottom plate 21 attached to the bottom of the foundation pit, the bottom plate 21 is anchored to the bottom of the foundation pit through a plurality of anchor rods 22, an inclined strut 23 is arranged between the bottom plate 21 and the supporting plate 1, and two ends of the inclined strut 23 are fixed to the supporting plate 1 and the bottom plate 21 respectively. The supporting plate 1 is supported through the bottom plate 21, the inclined supporting rod 23 and the anchor rod 22, so that the side wall of the foundation pit is supported, and the supporting function of the foundation pit is realized.
Referring to fig. 2, in order to facilitate the installation of the bottom plate 21, a plurality of anchor holes are formed through the bottom plate 21, the anchor rods 22 penetrate through the anchor holes and are inserted into the soil layer, the top plate 221 attached to the upper side surface of the bottom plate 21 is fixedly connected to the upper ends of the anchor rods 22, and the lower ends of the anchor rods 22 are pointed; the two ends of the inclined strut 23 are bolted and fixed with the support plate 1 and the bottom plate 21 respectively, specifically, the two ends of the inclined strut 23 are fixedly connected with the fixing blocks 231, the fixing blocks 231 are provided with fixing holes, and the two ends of the inclined strut 23 are bolted and fixed with the support plate 1 and the bottom plate 21 respectively through bolts penetrating through the fixing holes, so that the installation of the inclined strut 23 is also convenient, and the overall construction efficiency is improved; the number of the inclined supporting rods 23 can be set according to actual conditions, in the embodiment, the number of the inclined supporting rods 23 is three, and the joints of the three inclined supporting rods 23 and the supporting plate 1 are respectively positioned at the upper side and the two sides in the horizontal direction.
Referring to fig. 2 and 3, in order to improve the installation stability of the support plate 1 on the side wall of the foundation pit, the support mechanism 2 further comprises an anchoring rod 24 for anchoring the support plate 1 on the side wall of the foundation pit, the anchoring rod 24 is arranged perpendicular to the support plate 1, the anchoring rod 24 penetrates through the support plate 1 and is inserted into the soil layer, an anchoring plate 25 attached to the support plate 1 is fixed at one end of the anchoring rod 24 close to the support plate 1, and the anchoring plate 25 is located at one side of the support plate 1 away from the side wall of the foundation pit; specifically, in the present embodiment, an anchoring hole for the anchoring rod 24 to pass through is formed in the supporting plate 1, the diameter of the anchoring hole is the same as that of the anchoring rod 24, the anchoring plate 25 is coaxially and fixedly sleeved on the anchoring rod 24, and in order to facilitate inserting the anchoring rod 24 into the soil layer, one end of the anchoring rod 24 away from the anchoring plate 25 is set to be a tip; in this embodiment two anchor rods 24 are provided on the support plate 1. The supporting plate 1 is anchored on the side wall of the foundation pit through the anchor rods 22, so that the supporting plate 1 is more stably installed, and the supporting structure can play a stable supporting function for a long time.
Referring to fig. 3 and 4, the anchoring rod 24 is provided with a limiting member for limiting relative movement with the soil layer along the axial direction, specifically, the limiting member includes a limiting rod 26 slidably disposed on the outer wall of the anchoring rod 24, the axis of the limiting rod 26 intersects with the axis of the anchoring rod 24, and correspondingly, the outer wall of the anchoring rod 24 is provided with a mounting hole 241 for the limiting rod 26 to pass through; a cylindrical cavity 242 coaxial with the anchoring rod 24 is formed in the anchoring rod 24, the mounting hole 241 is communicated with the cavity 242, in order to enable the limiting rod 26 to slide to the protruding mounting hole 241, a driving block 27 coaxial with the anchoring rod 24 is arranged in the cavity 242, the driving block 27 is in threaded assembly with the anchoring rod 24, and correspondingly, threads are formed in the outer peripheral surface of the driving block 27 and the side wall of the cavity 242; one end of the driving block 27 is conical, one end of the limiting rod 26 abuts against the conical inclined surface of the driving block 27, and in order to enable the limiting rod 26 to be inserted into the soil layer, the length of the limiting rod 26 is greater than that of the mounting hole 241; in order to facilitate the control of the construction personnel to insert the limit rod 26 into the soil layer, one end of the cavity 242 near the support plate 1 is through, and the driving block 27 is coaxially and fixedly connected with the driving rod 28 penetrating out of the cavity 242.
Through the setting of gag lever post 26, when installation anchor rod 24, can make gag lever post 26 slide to not protruding mounting hole 241, thereby be convenient for insert anchor rod 24 in the soil layer, and after anchor rod 24 inserted in the soil layer, make driving block 27 along anchor rod 24 axial motion through rotating actuating lever 28, and the circular cone inclined plane through driving block 27 pushes away gag lever post 26 mounting hole 241 to inserting in the soil layer, thereby accessible gag lever post 26 restriction anchor rod 24 along axial motion, with the anchor effect to improvement backup pad 1, improve whole supporting construction's stability.
Referring to fig. 3 and 4, in order to further improve the effect of limiting the anchoring rod 24, a plurality of limiting rods 26 are provided, the plurality of limiting rods 26 are uniformly distributed along the circumferential direction of the anchoring rod 24, and a plurality of sets of limiting rods 26 and driving blocks 27 are provided, the plurality of sets of limiting rods 26 and driving blocks 27 are distributed along the axial direction of the anchoring rod 24, and a plurality of fixing blocks 231 are coaxially and fixedly sleeved on one driving rod 28; in the present embodiment, the limiting rods 26 are arranged with the axis perpendicular to the axis of the anchoring rod 24, and the limiting rods 26 and the driving blocks 27 are arranged in three groups, each group including four limiting rods 26.
Referring to fig. 2 and 5, be provided with many aqueducts 3 on backup pad 1, the one end and the backup pad 1 of aqueduct 3 are connected, the 3 other end of aqueduct extends in the direction that deviates from backup pad 1 to the soil layer, and the height that aqueduct 3 kept away from 1 one end of backup pad is not less than the height that aqueduct 3 is close to 1 one end of backup pad, run through on 3 pipe walls of aqueduct and seted up a plurality of guiding holes 31, and guiding hole 31 distributes in the first half of aqueduct 3, aqueduct 3 keeps away from 1 one end of backup pad and seals, and aqueduct 3 runs through backup pad 1 and tip near 1 one end of backup pad and link up, thereby discharge surplus moisture in the foundation ditch lateral wall soil layer through aqueduct 3, in order to reduce the pressure that supporting construction received.
Referring to fig. 2, specifically, a plurality of drain holes through which a plurality of water conduits 3 pass are formed in the supporting plate 1, the water conduits 3 pass through the drain holes and are embedded in the soil layer, and in order to smoothly drain water, the height of one end of the water conduit 3, which is far away from the supporting plate 1, is set to be higher than the height of one end of the water conduit 3, which is close to the supporting plate 1; and in order to reduce the rising amplitude of the water content in the soil layer, the arrangement density of the water guide pipes 3 is set to be gradually increased from the bottom of the foundation pit to the top of the foundation pit.
Referring to fig. 2 and 6, the part of the water conduit 3 in the soil layer is coated with a filter screen 4 at the outer side, and the aperture of the filter screen 4 is smaller than that of the water guide hole 31, so that the probability of blocking the water conduit 3 can be reduced; meanwhile, in order to prevent the water guide pipe 3 from deforming due to pressure, a reinforcing cage 5 is further sleeved on the outer side of the part, located in the soil layer, of the water guide pipe 3, a filter screen 4 is located in the reinforcing cage 5, a graded broken stone filter layer (not shown in the figure) is filled between the filter screen 4 and the reinforcing cage 5, the maximum grain size of the graded broken stone filter layer is smaller than the pore size of the reinforcing cage 5, and the minimum grain size of the graded broken stone filter layer is larger than the pore size of the filter screen 4; specifically, in this embodiment, steel reinforcement cage 5 is close to 1 one end fixedly connected with connecting plate 6 of backup pad, and connecting plate 6 makes steel reinforcement cage 5 be close to 1 one end of backup pad and seals, and outside aqueduct 3 was located to the fixed cover of connecting plate 6, and the particle diameter of graded broken stone filter layer is crescent from inside to outside.
The implementation principle of the embodiment is as follows: the anchor rods 22 fix the bottom plate 21 at the bottom of the foundation pit, and the bottom plate 21 supports the support rods through the inclined support rods 23, so that the function of supporting the side wall of the foundation pit is achieved; the supporting plate 1 is anchored on the side wall of the foundation pit through the anchoring rod 24, so that the mounting of the supporting plate 1 is more stable, the stability of the supporting structure is improved, and the supporting structure plays a stable supporting role for a long time; after excessive moisture in the side wall of the foundation pit passes through the graded broken stone filtering layer and the filter screen 4, water passes through the water guide holes 31 and enters the water pipe and is discharged from one end, close to the supporting plate 1, of the water guide pipe 3, so that the water content of the side wall soil layer of the foundation pit can be reduced, the pressure applied to the base supporting plate 1 is reduced, the pressure applied to the whole supporting structure is reduced, and the possibility of deformation of the supporting structure is reduced.
The embodiment also provides a construction method of the deep foundation pit supporting structure, which comprises the following steps:
a. construction of the water guide pipe 3: before construction, assembling the water guide pipe 3, the filter screen 4 and the reinforcement cage 5 into a whole, filling a graded broken stone filter layer between the filter screen 4 and the reinforcement cage 5, excavating a hole for installing the water guide pipe 3 on the side wall of a foundation pit according to a construction drawing, and installing a composition of the water guide pipe 3, the filter screen 4, the reinforcement cage 5 and the graded broken stone filter layer in the hole;
b; the installation of the supporting plate 1: enabling a plurality of water guide pipes 3 to penetrate through the supporting plate 1, and attaching the supporting plate 1 to the wall of the foundation pit;
c. the anchor rod 24 is installed: the anchoring rod 24 penetrates through an anchoring hole in the support plate 1 and is inserted into a soil layer on the side wall of the foundation pit, and after the anchoring plate 25 is attached to the support plate 1, the driving rod 28 is rotated until the driving limiting rod 26 is slidably inserted into the soil layer;
d. and (3) installing a bottom plate 21: attaching the bottom plate 21 to the bottom of the foundation pit, and inserting the anchor rod 22 into a soil layer at the bottom of the foundation pit through the anchor hole in the bottom plate 21 until the top plate 221 is attached to the bottom plate 21;
e. the inclined strut 23 is installed: and installing the inclined strut 23 between the bottom plate 21 and the support plate 1, and bolting and fixing the fixing blocks 231 at the two ends of the inclined strut 23 on the bottom plate 21 and the support plate 1 respectively to complete the construction of the supporting structure.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides a deep basal pit supporting construction which characterized in that: the device comprises a supporting plate (1) for attaching to and supporting the side wall of the foundation pit and a supporting mechanism (2) for supporting the supporting plate (1);
be provided with many aqueducts (3) on backup pad (1), the one end of aqueduct (3) with backup pad (1) is connected, and the other end is along deviating from the direction of backup pad (1) extends in the foundation ditch lateral wall soil layer, just aqueduct (3) are kept away from the height of backup pad (1) one end is not less than aqueduct (3) are close to the height of backup pad (1) one end, run through on aqueduct (3) pipe wall and seted up a plurality of guiding holes (31), guiding hole (31) distribute in the first half of aqueduct (3), aqueduct (3) are kept away from the one end of backup pad (1) is sealed, aqueduct (3) are close to the one end of backup pad (1) is run through backup pad (1) and tip link up.
2. A deep foundation pit supporting construction according to claim 1, wherein: the part of the water guide pipe (3) located in a foundation pit soil layer is coated with a filter screen (4) on the outer side, and the aperture of the filter screen (4) is smaller than that of the water guide hole (31).
3. A deep foundation pit supporting construction according to claim 2, wherein: the part that aqueduct (3) are arranged in the foundation ditch soil layer is equipped with steel reinforcement cage (5) in the outside cover, filter screen (4) are located in steel reinforcement cage (5), steel reinforcement cage (5) with it has graded rubble filter layer to fill between filter screen (4), the minimum particle diameter of graded rubble filter layer is greater than the aperture of filter screen (4), the maximum particle diameter of graded rubble filter layer is less than the aperture of steel reinforcement cage (5).
4. A deep foundation pit supporting construction according to claim 1, wherein: the height of one end, far away from the supporting plate (1), of the water guide pipe (3) is higher than that of one end, close to the supporting plate (1), of the water guide pipe (3).
5. A deep foundation pit supporting construction according to claim 1, wherein: the arrangement density of the water guide pipes (3) is gradually increased from the bottom of the foundation pit to the top of the foundation pit.
6. A deep foundation pit supporting construction according to claim 1, wherein: the supporting mechanism (2) comprises an anchoring rod (24) used for anchoring the supporting plate (1) on the side wall of the foundation pit, the anchoring rod (24) is perpendicular to the supporting plate (1), the anchoring rod (24) penetrates through the supporting plate (1) and is inserted into a soil layer, an anchoring plate (25) attached to one side, far away from the side wall of the foundation pit, of the supporting plate (1) is arranged at one end, close to the supporting plate (1), of the anchoring rod (24), and a limiting piece used for limiting the supporting rod to move relative to the soil layer in the soil layer along the axial direction is arranged on the anchoring rod (24).
7. The deep foundation pit supporting structure according to claim 6, wherein: the limiting piece comprises a limiting rod (26) which is arranged on the outer wall of the anchoring rod (24) in a penetrating mode in a sliding mode, the axis of the limiting rod (26) is intersected with the axis of the anchoring rod (24), a mounting hole (241) for the limiting rod (26) to penetrate in the sliding mode is formed in the outer wall of the anchoring rod (24), a cylindrical cavity (242) coaxial with the cylindrical cavity is formed in the anchoring rod (24), the mounting hole (241) is communicated with the cavity (242), the length of the limiting rod (26) is larger than that of the mounting hole (241), a driving block (27) coaxial with the anchoring rod (24) is arranged in the cavity (242), the diameter of the driving block (27) is consistent with that of the cavity (242), the driving block (27) is in threaded assembly with the anchoring rod (24), and one end of the driving block (27) is set to be conical, one end of the limiting rod (26) is abutted to the conical inclined surface of the driving block (27), the cavity (242) is close to one end of the supporting plate (1) to be communicated, and the driving block (27) is coaxially connected with a driving rod (28) extending out of the cavity (242).
8. The deep foundation pit supporting structure according to claim 6, wherein: the supporting mechanism (2) further comprises a bottom plate (21) attached to the bottom of the foundation pit, the bottom plate (21) is fixed to the bottom of the foundation pit through a plurality of anchor rods (22), an inclined strut (23) is arranged between the bottom plate (21) and the supporting plate (1), and two ends of the inclined strut (23) are fixed to the bottom plate (21) and the supporting plate (1) respectively.
9. The deep foundation pit supporting structure according to claim 6, wherein: one end of the anchoring rod (24) far away from the supporting plate (1) is set to be a tip.
10. A construction method of a deep foundation pit supporting structure is characterized by comprising the following steps: the method comprises the following steps:
construction of the water guide pipe (3): excavating a hole for installing the water guide pipe (3) on the side wall of the foundation pit according to a construction drawing, and installing the water guide pipe (3) in the hole;
b; the support plate (1) is installed: enabling a plurality of water guide pipes (3) to penetrate through the supporting plate (1), and attaching the supporting plate (1) to the wall of the foundation pit;
the anchoring rod (24) is installed: inserting the anchoring rod (24) into a soil layer on the side wall of the foundation pit through the support plate (1);
bottom plate (21) installation: attaching a bottom plate (21) to the bottom of the foundation pit, and inserting an anchor rod (22) into a soil layer at the bottom of the foundation pit through the bottom plate (21);
the inclined stay (23) is installed: a diagonal brace (23) is installed between the bottom plate (21) and the support plate (1).
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| CN202111030570.1A CN113882389A (en) | 2021-09-03 | 2021-09-03 | Deep foundation pit supporting structure and construction method thereof |
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| CN114411790A (en) * | 2022-02-09 | 2022-04-29 | 深圳百勤建设工程有限公司 | Foundation ditch stagnant water curtain strengthens device |
| CN114775594A (en) * | 2022-05-24 | 2022-07-22 | 河南建科城市更新工程技术有限公司 | Anchoring device for foundation pit support |
| CN114775635A (en) * | 2022-04-23 | 2022-07-22 | 安徽安德建筑设计有限公司 | Building foundation pit maintenance plate |
| CN114892655A (en) * | 2022-04-29 | 2022-08-12 | 中交一公局集团有限公司 | Anchor pipe assembly |
| CN116575479A (en) * | 2023-07-12 | 2023-08-11 | 方也智能装备(南通)有限公司 | Supporting structure of inclined pile anchor rod foundation pit |
| CN116591185A (en) * | 2023-07-17 | 2023-08-15 | 中建三局集团华南有限公司 | Deep foundation pit supporting structure and deep foundation pit construction method |
| CN117868158A (en) * | 2024-03-11 | 2024-04-12 | 中国电建集团西北勘测设计研究院有限公司 | Recovery assembly type standard part supporting structure |
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| CN116591185A (en) * | 2023-07-17 | 2023-08-15 | 中建三局集团华南有限公司 | Deep foundation pit supporting structure and deep foundation pit construction method |
| CN117868158A (en) * | 2024-03-11 | 2024-04-12 | 中国电建集团西北勘测设计研究院有限公司 | Recovery assembly type standard part supporting structure |
| CN117868158B (en) * | 2024-03-11 | 2024-06-04 | 中国电建集团西北勘测设计研究院有限公司 | Recovery assembly type standard part supporting structure |
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Application publication date: 20220104 |