CN212335993U - Steel pipe cement composite pile - Google Patents
Steel pipe cement composite pile Download PDFInfo
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- CN212335993U CN212335993U CN202021297178.4U CN202021297178U CN212335993U CN 212335993 U CN212335993 U CN 212335993U CN 202021297178 U CN202021297178 U CN 202021297178U CN 212335993 U CN212335993 U CN 212335993U
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Abstract
The utility model provides a steel pipe cement composite pile, this steel pipe cement composite pile includes: an outer steel pipe which is driven into the soil layer along the vertical direction; the inner steel pipe is arranged in the outer steel pipe along the vertical direction, the outer diameter of the inner steel pipe is smaller than the inner diameter of the outer steel pipe, and the lower end of the inner steel pipe is arranged below the outer steel pipe; the well cementation cement sheath is positioned below the outer layer steel pipe and surrounds the inner layer steel pipe; the annular cement sheath is positioned between the outer layer steel pipe and the inner layer steel pipe, and the annular cement sheath and the well cementation cement sheath are of an integrally formed structure. Through the utility model discloses, the pile foundation among the prior art subsides and the relatively poor technical problem of side direction toughness performance has been alleviated.
Description
Technical Field
The utility model relates to a civil construction's technical field especially relates to a steel pipe cement composite pile.
Background
In the building industry, large-scale equipment has higher and higher requirements on foundation foundations, particularly split high-precision large-scale equipment has higher requirements on foundation settlement and lateral toughness, and pile foundations are required to have higher bearing capacity and pile foundation toughness. The existing pile foundation is usually of a reinforced concrete structure, has the problems of poor foundation settlement and poor lateral toughness performance, and is difficult to provide stable and reliable support for large-scale equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a steel pipe cement composite pile to alleviate the pile foundation among the prior art subsides and the relatively poor technical problem of side direction toughness performance.
The above object of the present invention can be achieved by the following technical solutions:
the utility model provides a steel pipe cement composite pile, steel pipe cement composite pile includes:
an outer steel pipe which is driven into the soil layer along the vertical direction;
the inner steel pipe is arranged in the outer steel pipe along the vertical direction, the outer diameter of the inner steel pipe is smaller than the inner diameter of the outer steel pipe, and the lower end of the inner steel pipe is arranged below the outer steel pipe;
the well cementation cement sheath is positioned below the outer layer steel pipe and surrounds the inner layer steel pipe;
the annular cement sheath is positioned between the outer layer steel pipe and the inner layer steel pipe, and the annular cement sheath and the well cementation cement sheath are of an integrally formed structure.
In a preferred embodiment, a sealing plate is connected to the bottom of the inner steel pipe.
In a preferred embodiment, the lower end of the inner steel pipe is formed with a bottom cement column, and the bottom cement column and the well cementation cement sheath are formed into an integral structure.
In a preferred embodiment, the cemented cement sheath is a structure in which cement is mixed with the earth formation.
In a preferred embodiment, the outer diameter of the outer layer steel pipe ranges from 500mm to 1200mm, and the wall thickness ranges from 10mm to 52 mm; the outer diameter range of the inner layer steel pipe is 240 mm-500 mm, and the wall thickness range is 5 mm-20 mm.
In a preferred embodiment, the outer diameter of the outer steel pipe is 60mm, and the wall thickness is in the range of 25 mm; the outer diameter range of the inner layer steel pipe is 350mm, and the wall thickness range is 10 mm.
In a preferred embodiment, the length ratio of the length of the outer steel pipe to the total length of the pile body of the steel pipe cement composite pile ranges from 30% to 60%.
In a preferred embodiment, the outer steel pipe is driven into the ground by hammering.
In a preferred embodiment, the outer layer steel pipe comprises a plurality of steel pipe sections distributed along the longitudinal direction, and every two adjacent steel pipe sections are connected through welding.
In a preferred embodiment, the cement forming the well cementation cement sheath and the annulus cement sheath is cement paste or cement mortar.
The utility model discloses a characteristics and advantage are:
the utility model provides a steel pipe cement composite pile, well cementation cement sheath and annular space cement sheath, be connected to outer steel pipe and inlayer steel pipe together with the soil layer, the soil layer of well cementation cement sheath below supports this steel pipe cement composite pile, can produce great side between the soil layer of well cementation cement sheath pile body and side and rub and hinder, can produce great side between the lateral wall of outer steel pipe and the soil layer simultaneously and rub and hinder, the fastness of being connected between this steel pipe cement composite pile and the soil layer has been improved, be favorable to improving the basis of steel pipe cement composite pile and subside, side direction toughness performance.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of a steel pipe cement composite pile provided by the present invention;
FIG. 2 is a step diagram of the construction pile-forming of the steel pipe cement composite pile shown in FIG. 1;
FIG. 3 is a schematic diagram of a pile-forming method for a steel pipe cement composite pile provided by the present invention;
fig. 4 is a schematic structural diagram of a longitudinal loading device in the testing method of the steel pipe cement composite pile provided by the present invention;
fig. 5 is a schematic view of a testing method for a steel pipe cement composite pile provided by the present invention;
fig. 6 is the structural schematic diagram of the outer steel pipe in the steel pipe cement composite pile provided by the utility model.
The reference numbers illustrate:
10. an outer steel pipe; 11. a steel pipe section; 20. an inner layer steel pipe; 31. an annular cement sheath; 32. cementing a cement sheath; 33. a bottom cement column; 40. closing the plate;
50. a soil layer; 51. a vertical pile hole;
60. a longitudinal loading device; 61. anchoring piles in counter-force; 62. loading a beam; 63. and a hydraulic jack.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example one
The utility model provides a steel pipe cement composite pile, as shown in figure 1, this steel pipe cement composite pile includes: the outer steel pipe 10, the inner steel pipe 20, the well cementation cement sheath 32 and the annulus cement sheath 31; the outer layer steel pipe 10 is driven into the soil layer 50 along the vertical direction; the inner steel pipe 20 is arranged in the outer steel pipe 10 along the vertical direction, the outer diameter of the inner steel pipe 20 is smaller than the inner diameter of the outer steel pipe 10, and the lower end of the inner steel pipe 20 is arranged below the outer steel pipe 10; the well cementation cement sheath 32 is positioned below the outer layer steel pipe 10 and surrounds the inner layer steel pipe 20; the annular cement sheath 31 is positioned between the outer steel pipe 10 and the inner steel pipe 20.
In this steel pipe cement composite pile, well cementation cement sheath 32 and annular space cement sheath 31, connect outer steel pipe 10 and inlayer steel pipe 20 and soil layer 50 together, the soil layer 50 of well cementation cement sheath 32 below supports this steel pipe cement composite pile, can produce great side friction between the soil layer 50 of well cementation cement sheath 32 pile body and side, can produce great side friction between the lateral wall of outer steel pipe 10 and the soil layer 50 simultaneously, the fastness of being connected between this steel pipe cement composite pile and the soil layer 50 has been improved, be favorable to improving the basis of steel pipe cement composite pile and subside, the side direction toughness performance, make this steel pipe cement composite pile have great bearing capacity and side direction bending load bearing capacity.
As shown in fig. 2, during construction, the depth of the vertical pile hole 51 is greater than the penetration depth of the inner steel pipe 20, a gap is formed between the bottom surface of the vertical pile hole 51 and the bottom surface of the inner steel pipe 20, the poured cement forms a bottom cement column 33 in the gap, the bottom cement column 33, the well cementation cement sheath 32 and the annular cement sheath 31 form an integrated structure, which is beneficial to enhancing the connection strength of the steel pipe cement composite pile and the soil layer 50 and improving the bearing capacity of the steel pipe cement composite pile.
Example two
The utility model provides a steel pipe cement composite pile can adopt the pile-forming method shown in figure 3 to construct into a pile, as shown in figures 1-3, this pile-forming method includes: step S10, driving the outer steel pipe 10 into the soil layer 50 along the vertical direction; step S20, drilling the soil layer 50 in the outer steel pipe 10 along the vertical direction to form a vertical pile hole 51; step S30, vertically lowering the inner steel pipe 20 into the vertical pile hole 51, wherein the bottom of the inner steel pipe 20 is connected with a sealing plate 40, and the lower end of the inner steel pipe 20 is lowered below the outer steel pipe 10; step S40, cement is poured into the vertical pile hole 51 to form a cementing cement sheath 32 surrounding the inner steel pipe 20 and located below the outer steel pipe 10, and an annular cement sheath 31 located between the outer steel pipe 10 and the inner steel pipe 20.
The steel pipe cement composite pile is constructed by the steel pipe cement composite pile forming method, the well cementation cement sheath 32 and the annular cement sheath 31 connect the outer steel pipe 10 and the inner steel pipe 20 together with the soil layer 50, the soil layer 50 below the well cementation cement sheath 32 supports the steel pipe cement composite pile, a larger side friction resistance can be generated between the pile body of the well cementation cement sheath 32 and the soil layer 50 on the side, and meanwhile, a larger side friction resistance can be generated between the side wall of the outer steel pipe 10 and the soil layer 50, so that the connection firmness between the steel pipe cement composite pile and the soil layer 50 is improved, and the foundation settlement and the lateral toughness performance of the steel pipe cement composite pile are improved.
Compared with the conventional cast-in-place concrete pile, the steel pipe cement composite pile has higher toughness, rigidity, bearing performance and the like, and is beneficial to improving the bearing capacity of the pile foundation in the building engineering and reducing the operation cost. The steel pipe cement composite pile is particularly suitable for the condition that a metal structure pile body needs to be exposed from the ground surface, such as a beam, a column and other structures which need to be welded with the pile body, so as to meet the high performance requirements of large and medium-sized equipment and ultra-heavy equipment in the building and electromechanical industry on a pile foundation, particularly the requirements on pile foundation settlement, high bearing capacity, high rigidity, high strength, high bending resistance and the like. Specifically, the cement poured into the vertical pile hole 51 may be cement paste or cement mortar.
In an embodiment of the present invention, step S40 includes: step S41, a pouring pipeline is put in, and the pouring pipeline is positioned in the vertical pile hole 51 and outside the inner steel pipe 20; and step S42, pouring cement into the vertical pile hole 51 through the pouring pipeline. The upper end of the filling pipeline is connected with a pump truck, cement is filled into the vertical pile hole 51 through the filling pipeline by the pump truck until the upper clear water is completely discharged, the cement returns to the surface, the pipeline is pumped out, and the slurry is solidified.
As shown in fig. 1, the outer diameter of the annular cement sheath 31 is limited by the inner wall of the outer steel pipe 10. After cement is injected into the vertical pile hole 51, the cement can carry soil to return upwards, meanwhile, the cement can diffuse into the soil layer below the outer steel pipe 10, the outer size of the formed well cementation cement sheath 32 is larger than that of the annular cement sheath 31, the cement diffused into the soil layer is solidified with the soil, and the formed well cementation cement sheath 32 is a structure formed by mixing the cement and the soil layer.
Further, in step S41, at least two pouring pipes are lowered, the lower ends of both pouring pipes are lowered to the bottom of the vertical pile hole 51, and both pouring pipes are symmetrical with respect to the axis of the vertical pile hole 51. And cement is poured from the bottom of the vertical pile hole 51, the cement returns upwards to push out redundant soil, the cement returns to the ground height in a mode of returning the slurry upwards from the bottom, and the construction of the steel pipe cement composite pile is completed after the cement is automatically solidified.
In step S10, the outer steel pipe 10 may be hammered into the soil 50. Before hammering, a hole for accommodating the outer-layer steel pipe 10 is not formed in the soil layer 50, the outer-layer steel pipe 10 is hammered into the soil layer 50 under the effect of hammering force, so that the outer-layer steel pipe 10 is matched with the soil layer in a friction mode, and a more compact matching structure is formed between the outer-layer steel pipe 10 and the soil layer 50.
The outer layer steel pipe 10 may have a single-joint structure or a multi-joint structure. Under the condition that the outer steel pipe 10 is of a single-section structure, the outer steel pipe 10 is vertically arranged, and the outer steel pipe 10 can be driven into the soil layer 50 to a set depth through multiple hammering. In the case that the outer steel pipe 10 has a multi-section structure, as shown in fig. 6, the outer steel pipe 10 includes a plurality of steel pipe sections 11, two adjacent steel pipe sections 11 are connected by welding, and after one steel pipe section is driven into the soil layer 50, the next steel pipe section 11 is connected and hammed, which is convenient for installation. The field hammering operation can adopt a pile driver to carry out field operation. Furthermore, in two adjacent steel pipe sections 11, the lower end of the steel pipe section 11 above is provided with a pile tongue, the upper end of the steel pipe section 11 below is provided with a hole matched with the pile tongue, and the pile tongue is inserted into the hole, so that the welding firmness is improved conveniently.
Before the inner steel pipe 20 is put into the pile body of the outer steel pipe 10, a hole is drilled in the pile body, and the hole can be drilled by a drilling machine or a rotary excavating machine, preferably the rotary excavating machine. After drilling to a designed depth, the inner steel pipe 20 is lowered. The operation is transferred to the mode that the layer steel pipe was transferred through crane hoist and mount, and inlayer steel pipe 20 can be multisection structure, can connect in advance outside the field, also can go into the in-process and carry out the segmentation welding jobs under, finally with inlayer steel pipe 20 be connected to need length can. The sealing plate 40 arranged at the bottom of the inner steel pipe 20 can prevent cement from flowing into the inner steel pipe 20 in the cement pouring process to cause waste; specifically, the sealing plate 40 may be connected to the inner steel tube 20 by welding.
The pile-forming method of the steel pipe cement composite pile adopts the pile driver, the drilling machine, the pump truck and the crane for construction, and has the characteristics of less used machines and tools, low cost, simple pile-forming and high speed.
After the outer steel pipe 10 is put into the soil layer 50, the drill bit can be used for drilling, preferably, the diameter of the drilling range of the drill bit is smaller than the inner diameter of the outer steel pipe 10, so that the diameter of the vertical pile hole 51 is smaller than the inner diameter of the outer steel pipe 10, a gap is reserved between the drill bit and the outer steel pipe 10 in the drilling process, and the drill bit is prevented from damaging the outer steel pipe 10. When cement is poured, the cement can return upwards to drive the excessive soil in the vertical pile hole 51 to be discharged upwards.
In one embodiment of the present invention, the outer diameter of the outer steel pipe 10 ranges from 500mm to 1200mm, and the wall thickness ranges from 10mm to 52 mm; the outer diameter of the inner steel pipe 20 is 240mm to 500mm, and the wall thickness is 5mm to 20 mm. Preferably, the outer diameter of the outer layer steel pipe 10 is 60mm, and the wall thickness is 25 mm; the outer diameter of the inner steel pipe 20 is 350mm, and the wall thickness is 10 mm.
Further, the length of the outer steel pipe 10 is 30 to 60% of the length of the vertical pile hole 51.
EXAMPLE III
The utility model provides a steel pipe cement composite pile can adopt the test method shown in FIG. 5 to test for carry out vertical loading test to foretell steel pipe cement composite pile, as shown in FIG. 5, this test method includes: step P10, constructing the steel pipe cement composite pile; step P20, arranging a longitudinal loading device 60, wherein as shown in FIG. 4, the longitudinal loading device 60 comprises a loading beam 62, a hydraulic jack 63 and a plurality of reaction anchor piles 61, the plurality of reaction anchor piles 61 are fixedly arranged around the steel pipe cement composite pile, and two ends of the loading beam 62 are respectively connected with the reaction anchor piles 61; the hydraulic jack 63 is arranged along the longitudinal direction and is respectively connected with the pile head of the steel pipe cement composite pile and the loading cross beam 62. The testing method further comprises a step P30 of applying longitudinal loading to the pile head of the steel pipe cement composite pile by the longitudinal loading device 60.
The test method can realize the longitudinal loading test of the steel pipe cement composite pile and the test of the lateral bending resistance bearing capacity. The counter-force anchor pile 61 is used as a counter-force structure, longitudinal loading is carried out in a hydraulic jack 63 ballast mode, the counter-force anchor pile 61 is used as a counter-force foundation to detect the bearing performance of the steel pipe cement composite pile, and the counter-force anchor pile 61 can be a steel plate pile, a steel pipe pile, a composite pile or an anchor pile. In the field, a pile foundation structure on the field can be used as a counter-force anchor pile 61, the loading cross beam 62 is connected above the pile foundation structure on the field, and the loading cross beam 62 and the pile foundation mechanism which are connected together are used as a counter-force structure for implementing longitudinal loading, so that the transportation, field entering and exiting and hoisting operations of materials and equipment can be reduced.
As shown in fig. 4, the loading beam 62 is erected above the steel pipe cement composite pile to be detected, the hydraulic jack 63 is placed between the loading beam 62 and the steel pipe cement composite pile, the hydraulic jack 63 is pressurized by adopting a hydraulic station so as to load the acting force to the pile head of the steel pipe cement composite pile, the displacement sensor used for detecting the longitudinal settlement of the pile head is installed on the pile head of the steel pipe cement composite pile, the loading is stopped when the pile head displacement reaches the preset failure condition, the ultimate bearing capacity of the steel pipe cement composite pile can be known, and the design of parameters such as the pipe diameter, the wall thickness and the length of the outer steel pipe 10 and the inner steel pipe 20 is facilitated.
The loading beam 62 and the reaction anchor 61 may be connected by welding or bolting. The number of the reaction anchor piles 61 may be two or more than two. Under the condition that the number of the counter-force anchor piles 61 is two, the two counter-force anchor piles 61 are distributed on two sides of the axis of the steel pipe cement composite pile, and the axis of the counter-force anchor pile 61 and the axis of the steel pipe cement composite pile are located on the same plane; under the condition that the quantity of counter-force anchor stake 61 is greater than two, for example counter-force anchor stake 61 be four, four counter-force anchor stakes 61 are square distribution, vertical loading device 60 still includes two tie-beams, the tie-beam sets up along the horizontal direction, the both ends of tie-beam are connected with the top of a counter-force anchor stake 61 respectively, two opposite side distributions of this square are followed to two tie-beams, loading crossbeam 62 is mutually perpendicular with the tie-beam, loading crossbeam 62 locates the below of two tie-beams and with the tie-beam butt, the tie-beam can exert decurrent pressure to loading crossbeam 62.
The above description is only for the embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a steel pipe cement composite pile which characterized in that, steel pipe cement composite pile includes:
an outer steel pipe which is driven into the soil layer along the vertical direction;
the inner steel pipe is arranged in the outer steel pipe along the vertical direction, the outer diameter of the inner steel pipe is smaller than the inner diameter of the outer steel pipe, and the lower end of the inner steel pipe is arranged below the outer steel pipe;
the well cementation cement sheath is positioned below the outer layer steel pipe and surrounds the inner layer steel pipe;
the annular cement sheath is positioned between the outer layer steel pipe and the inner layer steel pipe, and the annular cement sheath and the well cementation cement sheath are of an integrally formed structure.
2. The steel pipe cement composite pile as claimed in claim 1, wherein a sealing plate is connected to the bottom of the inner steel pipe.
3. The steel pipe cement composite pile according to claim 2, wherein a bottom cement column is formed at a lower end of the inner steel pipe, and the bottom cement column and the well cementation cement sheath are of an integrally formed structure.
4. The steel pipe cement composite pile as claimed in claim 1, wherein the cementing cement sheath is a structure in which cement and soil layers are mixed.
5. The steel pipe cement composite pile as claimed in claim 1, wherein the outer diameter of the outer layer steel pipe ranges from 500mm to 1200mm, and the wall thickness ranges from 10mm to 52 mm; the outer diameter range of the inner layer steel pipe is 240 mm-500 mm, and the wall thickness range is 5 mm-20 mm.
6. The steel pipe cement composite pile as claimed in claim 5, wherein the outer steel pipe has an outer diameter of 60mm and a wall thickness in the range of 25 mm; the outer diameter range of the inner layer steel pipe is 350mm, and the wall thickness range is 10 mm.
7. The steel pipe cement composite pile according to claim 1, wherein the length ratio of the length of the outer steel pipe to the total length of the pile body of the steel pipe cement composite pile is in the range of 30% to 60%.
8. The steel pipe cement composite pile as claimed in claim 1, wherein the outer steel pipe is hammered into the ground.
9. The steel pipe cement composite pile according to claim 1, wherein the outer layer steel pipe comprises a plurality of steel pipe sections distributed along the longitudinal direction, and the adjacent two steel pipe sections are connected through welding.
10. The steel pipe cement composite pile according to claim 1, wherein the cement forming the well cementation cement sheath and the annulus cement sheath is cement paste or cement mortar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021297178.4U CN212335993U (en) | 2020-07-06 | 2020-07-06 | Steel pipe cement composite pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021297178.4U CN212335993U (en) | 2020-07-06 | 2020-07-06 | Steel pipe cement composite pile |
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| CN212335993U true CN212335993U (en) | 2021-01-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719549A (en) * | 2020-07-06 | 2020-09-29 | 中国石油大学(北京) | Steel pipe cement composite pile and pile forming method and testing method thereof |
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- 2020-07-06 CN CN202021297178.4U patent/CN212335993U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719549A (en) * | 2020-07-06 | 2020-09-29 | 中国石油大学(北京) | Steel pipe cement composite pile and pile forming method and testing method thereof |
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