CN211036970U - CFG pile composite foundation structure - Google Patents
CFG pile composite foundation structure Download PDFInfo
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- CN211036970U CN211036970U CN201921867167.2U CN201921867167U CN211036970U CN 211036970 U CN211036970 U CN 211036970U CN 201921867167 U CN201921867167 U CN 201921867167U CN 211036970 U CN211036970 U CN 211036970U
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Abstract
The utility model belongs to the technical field of composite foundation technique and specifically relates to a CFG stake composite foundation structure is related to. The foundation pit supporting structure comprises a foundation pit, a soft soil layer and a supporting layer, wherein the soft soil layer and the supporting layer are arranged at the bottom of the foundation pit, the soft body layer is positioned above the supporting layer, a CFG pile hole is vertically drilled downwards at the bottom of the foundation pit, and the CFG pile hole penetrates through the soft soil layer and enters the supporting layer; CFG piles are poured in the CFG pile holes and are arranged at equal intervals; and a mattress layer is laid at the bottom of the foundation pit and the top of the soft soil layer and is positioned at the top of the CFG pile. The utility model provides a pair of CFG stake composite foundation structure has effectively improved the structural strength of ground.
Description
Technical Field
The utility model belongs to the technical field of composite foundation technique and specifically relates to a CFG stake composite foundation structure is related to.
Background
When the underground comprehensive pipe gallery is built, open excavation construction needs to be adopted, a deeper soft soil layer is found under a foundation pit in a groove inspection process during foundation pit construction, a peat clay layer is arranged under a bearing layer at the bottom of the foundation pit, appropriate deformation coordination measures need to be taken at a part with larger soil layer property change, stress concentration is avoided, the bearing capacity of the foundation is smaller, and adverse effects of the foundation on the foundation need to be considered during design.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a CFG stake composite foundation structure has effectively improved the structural strength of ground.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
a CFG pile composite foundation structure comprises a foundation pit, a soft soil layer and a bearing layer, wherein the soft soil layer and the bearing layer are arranged at the bottom of the foundation pit;
CFG piles are poured in the CFG pile holes and are arranged at equal intervals;
and a mattress layer is laid at the bottom of the foundation pit and is positioned at the top of the CFG pile.
By adopting the technical scheme, the end part of the CFG pile enters the holding layer, the holding layer is made of pebble-powder-containing clay or plastic-powder-containing clay, the CFG pile is hard in texture and high in strength, the CFG pile transmits the stress at the bottom of the foundation pit to the holding layer, and the holding layer is used as a stress support of the CFG pile to ensure the stress stability of the CFG pile; the CFG pile penetrates through a soft soil layer, the pile body has certain bonding strength, the compressibility of the pile body is obviously smaller than that of the soft soil layer under the action of load, the additional stress transmitted from the foundation to the composite foundation is gradually concentrated on the CFG pile along with the deformation of the foundation, the stress concentration phenomenon occurs, and the bearing capacity of the soft soil layer is increased; when the CFG pile is punched, the soft soil layer is compacted to a certain degree under the extrusion action of vibration or impact, the water content, the porosity ratio and the compression coefficient of the reinforced foundation soil are all reduced, and the gravity and the compression modulus of the soil body are all increased; the mattress layer can share the vertical load and the horizontal load of CFG stake, reduces and slows down the stress concentration of basis bottom surface, prevents the horizontal fracture of CFG stake.
The utility model discloses further set up to: the CFG pile is formed by pouring C20 commercial concrete.
Through adopting above-mentioned technical scheme, guarantee the intensity of CFG stake.
The utility model discloses further set up as, be 180cm × 180cm square distribution between the CFG stake on the horizontal direction.
By adopting the technical scheme, the CFG piles are distributed in a 180cm × 180cm square shape in the horizontal direction, namely the adjacent CFG piles are equidistant, the stress uniformity of the bottom of the foundation pit is ensured, and the structural strength of the foundation is improved.
The utility model discloses further set up to: the top of the CFG pile is also provided with a maintenance layer;
the maintenance layer is positioned below the mattress layer.
By adopting the technical scheme, after the CFG pile is poured, the pile top is covered with soil and sealed for maintenance, and the forming of the CFG pile is facilitated.
The utility model discloses further set up to: the mattress layer is formed by the static pressure of broken stones and sand stones.
By adopting the technical scheme, the floating slurry head of 0.50m is broken below the standard height of the top of the CFG pile before construction, the thickness of the mattress layer is ensured to reach the design thickness of 0.30m, the compaction coefficient is not less than 0.97, the mattress layer is formed by laying 2-3 cm of broken stones and gravels (with the content of 20-30%) in a static pressure manner, and the stress strength of the mattress layer is ensured.
The utility model discloses further set up to: the height difference between the top surface of the mattress layer and the bottom surface of the foundation pit is less than or equal to 3.0 cm.
By adopting the technical scheme, the elevation of the bottom surface of the foundation pit is ensured.
The utility model discloses further set up to: the verticality deviation of the CFG pile is less than or equal to 1%.
Through adopting above-mentioned technical scheme, guarantee that the CFG stake bears the pressure of ground on the vertical direction, prevent that the CFG stake from bearing the moment of torsion on the horizontal direction and breaking.
The utility model discloses further set up to: and a drainage blind ditch is arranged at the bottom of the foundation pit.
Through adopting above-mentioned technical scheme, introduce the drainage french drain with the ponding of foundation ditch bottom, prevent that foundation ditch bottom from producing ponding threat construction safety.
To sum up, the utility model discloses a beneficial technological effect does:
the end part of the CFG pile enters a bearing layer, the bearing layer is made of pebble powder-containing clay or plastic powder-containing clay, the CFG pile is hard in texture and high in strength, the CFG pile transmits the stress at the bottom of a foundation pit to the bearing layer, and the bearing layer is used as a stress support of the CFG pile to ensure the stress stability of the CFG pile; the CFG pile penetrates through a soft soil layer, the pile body has certain bonding strength, the compressibility of the pile body is obviously smaller than that of the soft soil layer under the action of load, the additional stress transmitted from the foundation to the composite foundation is gradually concentrated on the CFG pile along with the deformation of the foundation, the stress concentration phenomenon occurs, and the bearing capacity of the soft soil layer is increased; when the CFG pile is punched, the soft soil layer is compacted to a certain degree under the extrusion action of vibration or impact, the water content, the porosity ratio and the compression coefficient of the reinforced foundation soil are all reduced, and the gravity and the compression modulus of the soil body are all increased; the mattress layer can share the vertical load and the horizontal load of CFG stake, reduces and slows down the stress concentration of basis bottom surface, prevents the horizontal fracture of CFG stake.
And 2, the CFG piles are distributed in a 180cm × 180cm square shape in the horizontal direction, namely the adjacent CFG piles are equidistant, so that the stress uniformity of the bottom of the foundation pit is ensured, and the structural strength of the foundation is improved.
3. Before construction, a floating slurry head of 0.50m is broken below the standard height of the top of the CFG pile, the thickness of a mattress layer is guaranteed to reach the designed thickness of 0.30m, the compaction coefficient is not less than 0.97, the mattress layer is formed by laying 2-3 cm of broken stones and 20-30% of gravels in a static pressure mode, and the stress strength of the mattress layer is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a CFG pile composite foundation structure provided by the present invention;
fig. 2 is a top view of a CFG pile composite foundation structure provided by the present invention.
In the figure, 100, a foundation pit; 101. a support layer; 102. a soft soil layer; 103. maintaining a layer; 104. a mattress layer; 105. a CFG pile hole; 106. CFG piles; 107. a water drain hole; 108. spraying a concrete reinforcing steel net; 109. a pavement; 110. pressing the concrete; 201. and (4) draining blind ditches.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model aims at providing a CFG stake composite foundation structure has effectively improved the structural strength of ground.
Referring to fig. 1 and 2, for the utility model discloses a CFG pile composite foundation structure, including foundation pit 100 that has excavated, the road surface 109 at the top of foundation pit 100 adopts road roller compaction sclerosis, the border of foundation pit 100 adopts MU20 concrete solid brick, cement mortar M10 builds by laying bricks, the cast-in-place 120mm thick C30 concrete coping 110 at the top prevents concrete solid brick from becoming flexible and dropping because of cement mortar weathering or suffering vibrations (such as wind power or earthquake), collision, and then strengthen the wholeness of composite foundation structure the foundation pit 100 lateral wall is strutted and is spouted concrete reinforcement wire netting 108, 200mm × 200mm phi 8 steel netting is laid first, the C20 concrete that has 80mm thick is sprayed on its surface, the steel netting, firm, the stretching resistance is big, construction convenience, low cost, compared with the steel netting of traditional welding, intensity is three times of welding steel netting, weight is only half of welding steel netting, so the price of steel netting is lower than the welding steel netting of ordinary, the light price of steel netting, it is more favorable to the construction, the side wall of the construction of the side wall is saved greatly, the slope protection of the construction is three times of the construction of the side wall of welding steel netting, the foundation pit 100, the side wall is built by the safety protection, the side wall of the foundation pit 100, the side wall is built by the foundation pit 100, the safety protection of the foundation pit 100 is guaranteed, the side wall is guaranteed, the safety of the side wall of the foundation pit 100 is guaranteed, the side.
Referring to fig. 1 and 2, a weak soil layer 102 and a bearing layer 101 are sequentially arranged below a foundation pit 100, the weak soil layer is positioned above the bearing layer 101, the field control adopts a method of hanging a ball on a drill frame to measure the verticality of a CFG pile hole 105, a drilling machine with a verticality adjuster can also be adopted to control the verticality of a drill rod, the CFG pile hole 105 with the diameter of 40cm is drilled vertically downwards from the bottom of the foundation pit 100, the drilling depth is 10m, the CFG pile hole penetrates through the weak soil layer 102 and enters the bearing layer 101, the extrusion effect of vibration or impact enables the weak soil layer 102 to be compacted to a certain degree during drilling, the water content, the pore ratio and the compression coefficient of the reinforced foundation soil are reduced and reduced, the gravity and the compression modulus of the soil are increased, the CFG pile holes 105 are drilled on the bottom surface of the foundation pit 100 in a 180cm × 180cm square, the adjacent CFG piles are equidistant, the stress uniformity of the bottom of the foundation pit 100 is ensured, and the structural strength of a foundation is improved.
And after the hole is drilled to the designed elevation, stopping drilling, lifting the drill rod by 20-30 cm, and pumping C20 commercial concrete for pouring, wherein the feeding amount of each pile is not less than the designed pouring amount. And after the drill pipe core tube is filled with C20 commercial concrete, tube drawing is started, and continuous tube drawing is ensured. The elevation of the construction pile top is preferably 50cm higher than the designed elevation, and after the pouring pile forming is finished, the pile top is covered with soil and covered with a maintenance layer 103, which is beneficial to the forming of the CFG pile 106. The drilling ensures that the verticality deviation of the CFG pile hole 105 is less than or equal to 1 percent, further ensures that the verticality deviation of the CFG pile 106 is less than or equal to 1 percent, enables the CFG pile 106 to bear the pressure of a foundation in the vertical direction, and prevents the CFG pile 106 from breaking due to the fact that the CFG pile 106 bears the torque in the horizontal direction. The CFG pile 106 penetrates through the soft soil layer 102, the pile body has certain bonding strength, the compressibility of the pile body is obviously smaller than that of the soft soil layer 102 under the action of load, the additional stress transmitted from the foundation to the composite foundation is gradually concentrated on the CFG pile 106 along with the deformation of the foundation, the stress concentration phenomenon occurs, and the bearing capacity of the soft soil layer 102 is increased; the end of the CFG pile 106 enters the holding layer 101, the holding layer 101 is made of pebble-containing powder clay or plastic powder clay, the structure is hard and the strength is high, the CFG pile 106 transmits the stress at the bottom of the foundation pit 100 to the holding layer 101, and the holding layer 101 is used as stress support of the CFG pile 106, so that the stress stability of the CFG pile 106 is guaranteed.
Referring to fig. 1 and 2, a mattress layer 104 is laid at the bottom of a foundation pit 100 and at the top of a CFG pile, after a floating slurry head of 0.50m is broken below the elevation of the top of the CFG pile 106 before construction, a maintenance layer 103 is entirely located below the mattress layer 104 to avoid damaging a pile body below the designed elevation of the pile top and disturbing a soft soil layer 102 between the CFG piles, the thickness of the mattress layer 104 is guaranteed to reach the designed thickness of 0.30m, the compaction coefficient is not less than 0.97, the mattress layer 104 is formed by laying crushed stones of 2-3 cm and gravel (20-30% content) in a static pressure mode, the stress strength of the mattress layer 104 is guaranteed, the mattress layer 104 can share the vertical load and the horizontal load of the CFG pile 106, the stress concentration of the bottom surface of a foundation is reduced and slowed down, and the horizontal fracture of the cf. The height difference between the top surface of the mattress layer 104 and the bottom surface of the foundation pit 100 is less than or equal to 3.0cm, so that the elevation of the bottom surface of the foundation pit 100 is ensured finally. Drainage blind ditches 201 are formed in the two sides, located on the mattress layer 104, of the bottom of the foundation pit 100, accumulated water at the bottom of the foundation pit 100 is led into the drainage blind ditches 201, and therefore the situation that the accumulated water at the bottom of the foundation pit 100 threatens construction safety is prevented.
The utility model provides a CFG stake composite foundation structure, its construction process flow is: construction preparation → long auger drilling and digging hole → pumping pressure pouring concrete pile forming → steel pipe cage bottom vibration pressure application → steel pipe extraction.
(1) Preparation for construction
Excavating the foundation pit 100 to be 30cm above the bottom of the pit, manually cleaning the pit to the bottom of the pit, performing drilling detection and recording on the bottom of the pit, and then performing construction according to the CFG pile 106; according to the requirement of the construction period, work rolling operations such as measurement, CFG pile 106 construction, field leveling and the like are arranged to ensure the construction period. The material piling points are piled up in the space between buildings outside the foundation pit 100, and the power supply is led out nearby from the power distribution room.
(2) Positioning a drilling machine: after the drilling machine is in place, the drill rod is vertically aligned with the pile position center, and the verticality tolerance of the CFG pile 106 is ensured to be not more than 1%. The field control adopts a method of hanging a hanging ball on a drill frame to measure the verticality of the hole, and can also adopt a drilling machine with a verticality regulator to control the verticality of a drill rod. And (4) carrying out pile position centering and verticality inspection by site engineering technicians before construction of each pile. After the requirements are met, the drill can be drilled.
(3) Drilling to form a hole: when the drilling starts, the valve of the drill bit is closed, the drill rod is moved downwards until the drill bit touches the ground, the motor is started to drill, the speed is slow and then the speed is fast, and meanwhile, the deviation of the drilling is checked and corrected in time. When the drill rod is found to shake or be difficult to drill in the hole forming process, the footage should be slowed down to prevent the pile hole from deflecting, displacing and damaging a drilling tool. And stopping drilling when the formed hole reaches the designed elevation according to the footage mark on the tower body of the drilling machine.
(4) Stirring the mixture: the CFG pile 106 is made of commercial concrete C20.
(5) Pouring and drawing a pipe: and after the hole is drilled to the designed elevation, stopping drilling, lifting the drill rod by 20-30 cm, and pumping the mixture for pouring, wherein the feeding amount of each pile is not less than the designed pouring amount. And starting tube drawing after the drill rod core tube is filled with the mixture, and ensuring continuous tube drawing. The elevation of the construction pile top is higher than the designed elevation by 50cm, and after the pouring pile forming is finished, the pile top is covered with soil and sealed for maintenance. When the mixture is poured, a method of recording the pumping pressure times is adopted for controlling the pouring amount of the mixture, the conveying amount of each time of the conveying pump of the same type is basically a fixed value, and the feeding amount of the mixture is measured according to the pumping pressure times.
(6) Moving the machine: and (3) during pouring, adopting a static lifting drill rod (the drill rod can not be lifted while walking), controlling the pipe lifting speed to be 2-3 m/min, and performing construction to the next pile after the pouring reaches a control elevation.
(7) And (3) field test: for each disc of mixture, testing personnel need to monitor the slump, the mixture can be fed after the slump is qualified, the mixture is sampled and made into a mixture test block in the pile forming process, 1 group (3 blocks) of test blocks are made for each class, and the 28-day compressive strength of the test blocks is measured.
The quality inspection process of the CFG pile composite foundation structure comprises the following steps:
the test points should be arranged at the following locations:
(1) representative pile positions;
(2) the part with abnormal conditions in the construction;
(3) the foundation conditions are complex and may have an impact on the quality of the CFG pile 106.
The load test must be carried out when the pile body strength meets the test conditions, and is preferably carried out after the pile is formed for 28d, the test quantity of the single-pile composite foundation and the single-pile static load are respectively 1 percent of the total quantity of the piles, and each single project should not be less than 3 points. And (5) extracting not less than 10% of the piles of the total number of piles to perform a low-strain dynamic test to detect the integrity of the pile body.
The implementation principle of the embodiment is that the end of a CFG pile 106 enters a bearing layer 101, the bearing layer 101 is made of pebble powder clay or plastic powder clay and is hard in texture and high in strength, the CFG pile 106 transmits stress at the bottom of a foundation pit 100 to the bearing layer 101, the bearing layer 101 serves as a stress support of the CFG pile 106 to guarantee stress stability of the CFG pile 106, the CFG pile 106 penetrates through a weak soil layer 102, the pile body has certain bonding strength, the pile body compressibility is obviously smaller than that of the weak soil layer 102 under the load effect, additional stress transmitted to a composite foundation by a foundation is gradually concentrated on the CFG pile 106 along with deformation of the foundation, the stress concentration phenomenon occurs, the bearing capacity of the weak soil layer 102 is increased, when the CFG pile 106 is punched, the cushion layer 102 is compacted to a certain degree under the extrusion effect of vibration or impact, the water content, the pore ratio and the compression coefficient of the reinforced foundation soil are reduced and reduced, the gravity of the soil is increased, the compression cushion layer 104 can achieve vertical compression of the CFG pile 106, the gravity and the gravity of the CFG pile 106, the foundation, the gravity and the gravity of the ground foundation can be reduced, the ground foundation, the gravity and the ground foundation is reduced, the gravity of the ground foundation, the ground foundation is reduced, the ground foundation is guaranteed, the ground foundation is 0.100-ground-bed foundation horizontal load-bed pile foundation horizontal load-bed pile foundation.
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 (8)
1. The utility model provides a CFG stake composite foundation structure, includes foundation ditch (100) and weak soil layer (102) and holding power layer (101) of foundation ditch (100) bottom, weak soil layer is located the top of holding power layer (101), its characterized in that: a CFG pile hole (105) is drilled vertically downwards at the bottom of the foundation pit (100), and the CFG pile hole (105) penetrates through the weak soil layer (102) and enters the bearing stratum (101);
CFG piles (106) are poured in the CFG pile holes (105), and the CFG piles (106) are arranged at equal intervals;
a mattress layer (104) is laid at the bottom of the foundation pit (100), and the mattress layer (104) is located at the top of the CFG pile (106).
2. A CFG pile composite foundation structure according to claim 1, wherein: the CFG pile (106) is formed by pouring C20 commercial concrete.
3. A CFG pile composite foundation structure, according to claim 1, characterized in that said CFG piles (106) are horizontally distributed in 180cm × 180cm squares.
4. A CFG pile composite foundation structure according to claim 1, wherein: the top of the CFG pile (106) is also provided with a maintenance layer (103);
the maintenance layer (103) is positioned below the mattress layer (104).
5. A CFG pile composite foundation structure according to claim 1, wherein: the mattress layer (104) is formed by pressing crushed stones and sand stones.
6. A CFG pile composite foundation structure according to claim 1, wherein: the height difference between the top surface of the mattress layer (104) and the bottom surface of the foundation pit (100) is less than or equal to 3.0 cm.
7. A CFG pile composite foundation structure according to claim 1, wherein: the verticality deviation of the CFG pile (106) is less than or equal to 1%.
8. A CFG pile composite foundation structure according to claim 1, wherein: and a drainage blind ditch (201) is arranged at the bottom of the foundation pit (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921867167.2U CN211036970U (en) | 2019-10-31 | 2019-10-31 | CFG pile composite foundation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921867167.2U CN211036970U (en) | 2019-10-31 | 2019-10-31 | CFG pile composite foundation structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211036970U true CN211036970U (en) | 2020-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921867167.2U Active CN211036970U (en) | 2019-10-31 | 2019-10-31 | CFG pile composite foundation structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211036970U (en) |
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2019
- 2019-10-31 CN CN201921867167.2U patent/CN211036970U/en active Active
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