CN114411717B - Extension combined grouting precast concrete pipe pile - Google Patents
Extension combined grouting precast concrete pipe pile Download PDFInfo
- Publication number
- CN114411717B CN114411717B CN202210205287.6A CN202210205287A CN114411717B CN 114411717 B CN114411717 B CN 114411717B CN 202210205287 A CN202210205287 A CN 202210205287A CN 114411717 B CN114411717 B CN 114411717B
- Authority
- CN
- China
- Prior art keywords
- pipe
- grouting
- pile
- lateral
- precast concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011178 precast concrete Substances 0.000 title claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 239000004567 concrete Substances 0.000 claims abstract description 10
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 description 22
- 210000001503 joint Anatomy 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001550 time effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 239000011374 ultra-high-performance concrete Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
- E02D5/22—Piles
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a grouting precast concrete pipe pile after extension combination, which comprises a precast pipe pile and a grouting concrete curing layer, wherein the precast pipe pile comprises a plurality of precast concrete pipe pile sections and steel pile tips which are stacked in sequence along the vertical direction; the precast concrete tubular pile section comprises an annular columnar pipe body, a longitudinal grouting pipe and a lateral grouting channel; the slurry inlet of the lateral grouting channel is communicated with the longitudinal grouting pipe, and the slurry outlet of the lateral grouting channel is communicated with the outside of the pipe body; the lateral grouting channel comprises at least one throttling orifice plate arranged in the lateral grouting channel; the throttling stages of the throttling hole plates on the pipe bodies of the prefabricated pipe piles are gradually decreased from top to bottom; the steel pile tip is arranged at the lower end of the pipe body at the bottommost end. According to the invention, the single pipe pile connection can be lengthened according to the use requirement, and the continuity of the longitudinal grouting pipe in the pipe pile connection area is ensured.
Description
Technical Field
The invention relates to the technical field of building and bridge engineering foundations, in particular to a grouting precast concrete pipe pile capable of being lengthened and combined.
Background
Pile foundations are one of the most widely used foundation forms in China at present, and the most common pile foundation form is a bored pile. The pile foundation stratum of the type has strong adaptability, the pile length can be adjusted according to the needs, and the application range is the widest in pile foundation engineering of building engineering and bridge engineering. However, the bored pile has the environmental protection problems of large amount of slurry preparation, large amount of drilling slag generation and the like during pore forming, and has large field operation amount and difficult guarantee of construction quality.
The precast concrete pipe pile is another pile type with wider application, the pile foundation of the type is transported to a working point after being precast in a factory, and the precast pile is placed at a design elevation by adopting a driving or pressing mode. The traditional precast concrete pipe pile factory prefabrication is easy to ensure the construction quality, and the construction without pre-pore-forming is environment-friendly.
However, the traditional precast tubular pile is limited by the stratum greatly, the penetrability is poor when the stratum is harder, the bearing capacity is difficult to reach the design bearing capacity again when the stratum is softer, the settlement is large after the tubular pile is constructed, the horizontal anti-pushing capacity is weak, the use requirement cannot be met, meanwhile, the length of the traditional precast tubular pile is mostly customized, the overlong precast tubular pile is inconvenient to transport, and the overlong precast tubular pile can cause the problem of discontinuous longitudinal grouting pipes in a joint area.
Disclosure of Invention
The invention aims to solve the technical problems to a certain extent, provides a precast concrete pipe pile, can lengthen the connection of single pipe piles according to the use requirement, ensures the continuity of longitudinal grouting pipes in the pipe pile connection area, solves the problems of large settlement and weak horizontal thrust resistance of the connected pipe piles after construction, realizes graded pressure grouting, and avoids the phenomenon of pile body damage caused by weakening the section of a grouting ring in the pile sinking process.
On one hand, the invention provides a grouting precast concrete tubular pile after lengthening combination for solving the technical problem, which comprises a precast tubular pile and a grouting concrete curing layer, wherein the precast tubular pile comprises a plurality of precast concrete tubular pile sections and steel pile tips which are stacked in sequence along the vertical direction; the precast concrete tubular pile section comprises an annular columnar pipe body, a longitudinal grouting pipe and a lateral grouting channel; an upper connecting groove is formed in the upper end face of the pipe body in a recessed mode, and a lower connecting groove is formed in the lower end face of the pipe body in a recessed mode; the longitudinal grouting pipe is arranged in the pipe wall of the pipe body along the axial direction of the pipe body and is communicated with the upper connecting groove and the lower connecting groove from top to bottom; the lateral grouting channel is arranged on the side wall of the pipe body and is communicated with the longitudinal grouting pipe and the outside of the pipe body; the slurry inlet of the lateral grouting channel is communicated with the longitudinal grouting pipe, and the slurry outlet of the lateral grouting channel is communicated with the outside of the pipe body; the lateral grouting channel comprises at least one throttling orifice plate arranged in the lateral grouting channel; the throttling stages of the throttling hole plates on the pipe bodies of the prefabricated pipe piles are gradually decreased from top to bottom; the steel pile tip is arranged at the lower end of the pipe body at the bottommost end.
Further, the lateral grouting channel is provided with a plurality of throttle plates.
Further, the distance between two adjacent lateral grouting channels of the prefabricated pipe pile is 5-12 meters.
Further, the uppermost lateral grouting channel is 8-12 meters away from the pile top; the lateral grouting channel positioned at the lowest part is 5-15 m away from the pile end.
Further, a lateral grouting channel is arranged at a position 1-2 meters below the joints of the two precast piles. ( The corresponding advantages are that: the pipe pile joint is relatively weak near, the addition of soil mass around the pipe pile joint effectively increases the vertical and lateral constraints of foundation soil on the pipe pile in the area, and improves the bearing capacity of the section of the pipe pile )
Further, the upper annular groove and the lower annular groove are annular, and have the same size and structure; the sections of the upper connecting groove and the lower connecting groove are rectangular.
Further, the longitudinal grouting pipes are uniformly arranged along the circumferential direction of the pipe body, and the sizes of the upper annular groove and the lower annular groove are larger than the diameter of the longitudinal grouting pipe.
Further, a check valve is also arranged in the lateral grouting channel.
Further, the steel pile tip comprises a tip end and a connecting end, and the connecting end is matched with the pipe body in size.
Further, a longitudinal diversion pipeline matched with the longitudinal grouting pipe is further arranged in the steel pile tip, and the longitudinal diversion pipeline receives cement slurry in the longitudinal grouting pipe.
Further, the pipe body is connected with the steel pile tip through a pile end plate.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: cement paste is pressed in the vicinity of the steel pile tip through a longitudinal grouting pipe, and soil mass near the pile end is consolidated and reinforced or split and reinforced, so that the bearing capacity and strength of foundation soil are greatly improved, a pile end stiffening soil expansion head is formed, and the bearing area of the pile end is greatly increased; the pile side of the joint accessory of each pipe body of the pipe pile is pressed into cement paste through the lateral grouting channel 3 to solidify soil on the pile side, so that the bearing capacity of the pile side of the pipe pile is rapidly improved, and the time effect period of the vertical bearing capacity of the pipe pile is greatly shortened. After the soil body of the foundation at the pile side of the pipe pile is reinforced, the horizontal bearing capacity of the pipe pile is greatly increased. The pipe pile joint is relatively weak near, the addition of soil mass around the pipe pile joint effectively increases the vertical and lateral restraint of foundation soil on the pipe pile in the area, and improves the bearing capacity of the section of the pipe pile. The problem that grouting pipes in a joint area are discontinuous when the pipe pile is lengthened is solved, the longitudinal grouting pipes can be communicated only by centering welding on each pipe body of the pipe pile, and the pile end and pile side combined grouting problem of the ultra-long pipe pile is solved. The common-pipe grading pressure grouting is realized, a grouting ring is omitted, and the problem that the pile body is damaged due to the fact that the grouting ring weakens the section in the pile sinking process is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
In the accompanying drawings:
FIG. 1 is a longitudinal cross-sectional view of the precast concrete tubular pile segment pile in one embodiment of the present invention;
fig. 2 is a longitudinal sectional view of the combined grouting precast concrete pipe pile capable of lengthening according to an embodiment of the present invention;
fig. 3 is a transverse cross-sectional view of the combined grouting precast concrete pipe pile according to an embodiment of the present invention, wherein fig. 3a is a transverse cross-sectional view of a non-lateral grouting pipe, and fig. 3b is a transverse cross-sectional view of a lateral grouting pipe;
FIG. 4 is an enlarged partial view at A in FIG. 2 in two different examples;
FIG. 5 is a schematic view showing an internal structure of a lateral grouting passage in a specific example;
FIG. 6 is a schematic view showing an internal structure of a lateral grouting passage in another specific example;
FIG. 7 is a schematic view showing an internal structure of a lateral grouting passage in still another specific example;
FIG. 8 is a schematic view of a butt joint structure of upper and lower precast concrete tubular pile segments according to an embodiment;
FIG. 9 is a schematic view of the bottom and end points of a post-extension combined grouting precast concrete pipe pile according to an embodiment of the present invention;
FIG. 10 is a schematic view of a cross-section of a lower end plate of a post-extension combined grouting precast concrete pipe pile according to the present invention;
fig. 11 is a cross-sectional view of a lower pile end plate in an embodiment.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present invention.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present invention and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
As shown in fig. 1, a precast concrete tubular pile segment 100 according to an embodiment of the present invention includes a tubular body 1, a longitudinal grouting pipe 2, and a lateral grouting channel 3. An upper connecting groove 4 is formed in the upper end face of the pipe body 1 in a recessed mode, and a lower connecting groove 5 is formed in the lower end face of the pipe body 1 in a recessed mode. The longitudinal grouting pipe 2 is arranged inside the pipe wall of the pipe body 1 along the axial direction of the pipe body 1 and is communicated with the upper connecting groove 4 and the lower connecting groove 5 from top to bottom; the lateral grouting channel 3 is arranged on the side wall of the pipe body 1 and is communicated with the longitudinal grouting pipe 2 and the outside of the pipe body 1; the slurry inlet of the lateral grouting channel 3 is communicated with the longitudinal grouting pipe 2, and the slurry outlet of the lateral grouting channel 3 is communicated with the outside of the pipe body 1.
Referring to fig. 2 together, in this embodiment, a plurality of precast concrete pipe pile segments 100 can be stacked and connected according to the requirement of use by using the precast concrete pipe pile segments 100, and the precast concrete pipe piles 9 can be optionally lengthened to form an extension-combined precast concrete pipe pile. After two adjacent precast concrete pipe pile sections 100 are in butt joint, the adjacent connecting groove passages 6 formed by buckling the upper connecting grooves 4 and the lower connecting grooves 5 are filled with cement slurry from the longitudinal grouting pipe 2 and are discharged into the connecting groove passages 6 formed by buckling and communicating the upper connecting grooves 4 and the lower connecting grooves 5 of the pipe body 1, so that the two precast concrete pipe pile sections 100 are connected. The common-pipe grading pressure grouting is realized, a grouting ring is omitted, and the problem that the pile body is damaged due to the fact that the grouting ring weakens the section in the pile sinking process is avoided.
It is worth noting that the side face of the pipe body 1 is communicated with the longitudinal grouting pipe 2 and is provided with a lateral grouting channel 3, cement paste which is downwards discharged from the lateral grouting channel 3 when being subjected to pressure and is pressed into soil around the outer wall of the pipe body 1, so that soil around the outer periphery of the joint of the pipe body 1 is reinforced, the vertical and lateral constraint of foundation soil on the joint area of the pipe body 1 is effectively increased, the bearing capacity of the section of a pipe pile is improved, the continuity of the longitudinal grouting pipe 2 in the joint area of the pipe pile is ensured, and meanwhile, the problems of large settlement and weak horizontal thrust resistance of the connected pipe pile after construction are solved.
Preferably, in a preferred embodiment, the upper annular groove 4 and the lower annular groove 5 are annular, and have the same size and structure. Further, the cross sections of the upper connecting groove 4 and the lower connecting groove 5 are rectangular. The upper end face and the lower end face of the pipe body 1 are arranged in an annular groove mode, and butt joint can be achieved only by ensuring that the centers of the upper pipe body 1 and the lower pipe body 1 are aligned.
It will be appreciated that in other embodiments, the upper annular groove 4 and the lower annular groove 5 may not be continuous; the concrete can be arranged in sections, and only needs to ensure that after the butt joint, the concrete is solidified in the connecting groove passage 6 and has the effect of connecting the upper pipe body 1 and the lower pipe body 1.
Further, referring to fig. 3, a plurality of the longitudinal grouting pipes 2 are uniformly arranged along the circumferential direction of the pipe body 1. The dimensions of the upper annular groove 4 and the lower annular groove 5 are larger than the diameter of the longitudinal grouting pipe 2. In use, only the connection part of the pipe bodies 1 is required to be centered and welded, the connecting groove passage 6 can realize the communication of the longitudinal grouting pipes 2 of the upper pipe body 1 and the lower pipe body 1, the problem of pile end and pile side combined grouting of the ultra-long pipe pile is solved, the continuity of the longitudinal grouting pipes 2 in the pipe pile connection area is ensured, and therefore the ultra-long pipe pile can be connected in a segmented mode and then is convenient to transport. In addition, the high-performance UHPC cured by grouting in the longitudinal grouting pipe 2 can replace the pile steel bars, so that the performance of the grouting precast concrete pile after lengthening and combining is further improved.
In a preferred embodiment, a non-return valve 7 is also provided in the lateral grouting channel 3.
With reference to fig. 4, further, at least one orifice plate 8 disposed in the lateral grouting channel 3 may be further disposed in the lateral grouting channel. It will be appreciated that the multi-stage orifice plate 8 may further function to regulate the lateral pressure reduction.
Referring to fig. 5, which is a schematic diagram illustrating an internal structure of the lateral grouting channel 3 according to a specific example of the present invention, in this embodiment, the longitudinal grouting pipe 2 is formed with a multi-stage orifice plate 8, the check valve 8 is disposed on a side of the lateral grouting channel 3 near an outlet in a pressure drop direction, and the check valve 8 only allows concrete slurry to flow from the longitudinal grouting pipe 2 to the lateral grouting channel 3. In the present embodiment, the orifice formed by the orifice plate 8 is perpendicular to the flow direction of the concrete slurry.
Referring to fig. 6, in another embodiment of the present invention, the lateral grouting channel 3 is schematically shown, and in this embodiment, the orifice formed by the orifice plate 8 is inclined with the flow direction of the concrete slurry, so that a reverse speed can be provided at the next orifice plate 8, which can achieve a better effect of reducing the outlet pressure, and effectively reduce the number of stages of the orifice plate 8.
Referring to fig. 7, an internal structure of the lateral grouting channel 3 according to another embodiment of the present invention is shown, in which the orifice plate 8 forms a horn-shaped orifice, and the horn-shaped orifice faces the flow direction of the concrete slurry. In the same way, the throttle and the depressurization can be realized.
Further, the same section of the pipe body 1 is provided with a plurality of lateral grouting channels 3, and the lateral grouting channels are uniformly distributed along the circumferential direction of the pipe body 1. For example, 3 or 6 lateral grouting passages 3 are provided at a fixed height in the axial direction of the pipe body 1.
Further, the lateral grouting channel 3 is arranged in the range of 1-2m of the pipe body 1 below the upper connecting groove 4.
Referring again to fig. 1-7, another embodiment of the present invention provides an extendable post-assembly grouting precast concrete pipe pile. The length-adjustable combined grouting precast concrete pipe pile comprises a plurality of precast concrete pipe pile sections 100, and a plurality of precast concrete pipe pile sections 100 are stacked and combined axially to form the length-adjustable combined grouting precast concrete pipe pile.
Please also refer to fig. 8, which illustrates a butt joint structure of two precast concrete pipe pile segments 100 according to an embodiment of the present invention. Specifically, the upper end face of the pipe body 1 of the precast concrete pipe pile section 100 is provided with an upper pile end plate 110, the lower end face is provided with an upper pile end plate 12, and the butt joint can be realized by welding a weld layer 14 formed by welding the outer sides of the upper pile end plate 110 and the upper pile end plate 12. Preferably, the upper pile end plate 110 and the upper pile end plate 12 may further be reserved with half grooves (not shown), and sealing and pressure-bearing performance of the connecting groove passage 6 may be ensured by clamping a rubber grout stop ring or a rubber grout stop pad 15 (specifically determined according to the shape of the half grooves) in the half grooves.
The grouting precast concrete pipe pile 9 comprises precast pipe piles and grouting concrete curing layers after lengthening and combining, and the precast pipe piles comprise a plurality of precast concrete pipe pile sections 100 and steel pile tips 11 which are stacked in sequence along the vertical direction.
The steel pile tip 11 is arranged at the lower end of the pipe body at the bottommost end.
The lateral grouting channel 3 comprises at least one throttle plate 8 arranged in the lateral grouting channel 3; the throttle level on the throttle plate 8 of the lateral grouting channels 3 of the plurality of pipe bodies 1 is gradually decreased from top to bottom, so that the uppermost lateral grouting channel 3 has the largest step-down gear (namely the smallest grouting outlet output pressure). Preferably, the lateral grouting channel 3 of the lowermost pipe body 1 may not be provided with a throttle, i.e. the pile end grouting valve may not be provided with a throttle plate 8 to obtain maximum output pressure of the grouting port. Preferably, the lateral grouting channels 3 positioned on the same section have the same step-down gear.
Because the pressure that each side direction mud jacking passageway 3 receives is different when the pile sinking, consequently this orifice plate 8 quantity along with the side direction mud jacking passageway 3 locate can extend behind the combination mud jacking precast concrete tubular pile 9 the position from bottom to top increase gradually to satisfy the play thick liquid pressure of every position side direction mud jacking passageway 3, realize the grouting of hierarchical pressure, avoided the pile sinking in-process mud jacking ring to weaken the phenomenon that the cross-section leads to the pile body to destroy.
The longitudinal distance of the lateral grouting channels 3 can be adjusted between 5 and 12m according to stratum, the first lateral grouting channel 3 at the lowest position is located at the position 5 to 15m above the pile end, and the uppermost lateral grouting channel 3 is preferably located at the pile top 8 to 12m.
Referring to fig. 9, the steel pile tip 11 includes a tip end and a connecting end, and the connecting end is sized to fit the pipe body 1.
Optionally, in a preferred embodiment, a longitudinal diversion pipeline 111 matched with the longitudinal grouting pipe 2 is further provided in the steel pile tip 11, the longitudinal diversion pipeline 111 receives cement slurry in the longitudinal grouting pipe 2, and performs consolidation or cleavage reinforcement on soil near the pile end of the grouting precast concrete pipe pile 9 after the extension combination, so as to greatly improve the bearing capacity and strength of foundation soil, form a pile end stiffening soil expansion head, and greatly increase the bearing area of the pile end.
Further, a one-way valve is provided at the bottom of the longitudinal grouting pipe 2 to allow the cement slurry to flow from the longitudinal grouting pipe 2 into the longitudinal diversion pipe 111.
Preferably, the outer side wall of the steel pile tip 11 is further provided with a convex rib 123, and the convex dimension of the convex rib 123 gradually decreases towards one side of the tip.
Further, in a preferred embodiment, the pipe body 1 and the steel pile tip 11 are connected by a lower pile end plate 12.
The lower pile end plate 12 of the lowermost pipe body 1 of the extension combined grouting precast concrete pipe pile 9, and the steel pile tip 11 is welded on the bottom surface of the lower pile end plate 12.
Referring to fig. 10-11 together, the lower pile end plate 12 is provided with an opening 121 corresponding to the longitudinal grouting hole 2, and a tendon anchor 122 for the prestressed reinforcement to pass through. Of course, in an alternative embodiment, the middle part of the lower pile end plate 12 may be provided with an annular groove, so long as the prestressed reinforcement and the longitudinal grouting holes 2 are not blocked; the lower pile end plate 12 can also be arranged to be narrower, and can not shield the prestressed reinforcement and the longitudinal grouting holes 2.
Compared with the prior art, the invention has the following beneficial effects:
cement paste is pressed in the vicinity of the steel pile tip through a longitudinal grouting pipe, and soil mass near the pile end is consolidated and reinforced or split and reinforced, so that the bearing capacity and strength of foundation soil are greatly improved, a pile end stiffening soil expansion head is formed, and the bearing area of the pile end is greatly increased;
the pile side of the joint accessory of each pipe body of the pipe pile is pressed into cement paste through the lateral grouting channel 3 to solidify soil on the pile side, so that the bearing capacity of the pile side of the pipe pile is rapidly improved, and the time effect period of the vertical bearing capacity of the pipe pile is greatly shortened. After the soil body of the foundation at the pile side of the pipe pile is reinforced, the horizontal bearing capacity of the pipe pile is greatly increased. The pipe pile joint is relatively weak near, the addition of soil mass around the pipe pile joint effectively increases the vertical and lateral restraint of foundation soil on the pipe pile in the area, and improves the bearing capacity of the section of the pipe pile.
The problem that grouting pipes in a joint area are discontinuous when the pipe pile is lengthened is solved, the longitudinal grouting pipes can be communicated only by centering welding on each pipe body of the pipe pile, and the pile end and pile side combined grouting problem of the ultra-long pipe pile is solved.
The common-pipe grading pressure grouting is realized, a grouting ring is omitted, and the problem that the pile body is damaged due to the fact that the grouting ring weakens the section in the pile sinking process is avoided.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (8)
1. The grouting precast concrete pipe pile is characterized by comprising a precast pipe pile and a grouting concrete curing layer, wherein the precast pipe pile comprises a plurality of precast concrete pipe pile sections and steel pile tips which are stacked in sequence along the vertical direction; the precast concrete tubular pile section comprises an annular columnar pipe body, a longitudinal grouting pipe and a lateral grouting channel; an upper connecting groove is formed in the upper end face of the pipe body in a recessed mode, and a lower connecting groove is formed in the lower end face of the pipe body in a recessed mode; the longitudinal grouting pipe is arranged in the pipe wall of the pipe body along the axial direction of the pipe body and is communicated with the upper connecting groove and the lower connecting groove from top to bottom; the lateral grouting channel is arranged on the side wall of the pipe body and is communicated with the longitudinal grouting pipe and the outside of the pipe body; the slurry inlet of the lateral grouting channel is communicated with the longitudinal grouting pipe, and the slurry outlet of the lateral grouting channel is communicated with the outside of the pipe body; the lateral grouting channel comprises at least one throttling orifice plate arranged in the lateral grouting channel; the throttling stages of the throttling hole plates on the pipe bodies of the prefabricated pipe piles are gradually decreased from top to bottom; the steel pile tip is arranged at the lower end of the pipe body at the bottommost end;
the distance between two adjacent lateral grouting channels of the precast tubular pile is 5-12 meters; the uppermost lateral grouting channel is 8-12 meters away from the pile top; the lateral grouting channel positioned at the lowest part is 5-15 m away from the pile end.
2. The post-extension-combination grouting precast concrete pipe pile according to claim 1, wherein the lateral grouting channel is provided with a plurality of the throttle plates.
3. The post-extension combined grouting precast concrete pipe pile according to claim 2, wherein the throttle hole formed on the throttle plate is horn-shaped or inclined.
4. The extension-combined grouting precast concrete pipe pile according to claim 1, wherein the upper connecting groove and the lower connecting groove are annular and have the same size and structure; the sections of the upper connecting groove and the lower connecting groove are rectangular.
5. The post-extension-combination grouting precast concrete pipe pile according to claim 4, wherein a plurality of the longitudinal grouting pipes are uniformly arranged along the circumferential direction of the pipe body, and the sizes of the upper connecting groove and the lower connecting groove are larger than the diameter of the longitudinal grouting pipes.
6. The post-extension combined grouting precast concrete pipe pile according to claim 5, wherein the upper and lower connecting grooves are formed by welding the outer sides of pile end plates of adjacent precast concrete pipe pile sections, and rubber grout stop rings are arranged on the inner sides of the pile end plates, so that the connecting grooves can be sealed and can bear pressure.
7. The post-extension combined grouting precast concrete pipe pile according to claim 1, wherein the steel pile tip comprises a tip end and a connecting end, and the pipe body and the steel pile tip are connected through a lower pile end plate arranged on the lower end face of the pipe body.
8. The post-extension-combination grouting precast concrete pipe pile according to claim 7, wherein a longitudinal diversion pipeline matched with the longitudinal grouting pipe is further arranged in the steel pile tip, and the longitudinal diversion pipeline receives cement slurry in the longitudinal grouting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210205287.6A CN114411717B (en) | 2022-03-03 | 2022-03-03 | Extension combined grouting precast concrete pipe pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210205287.6A CN114411717B (en) | 2022-03-03 | 2022-03-03 | Extension combined grouting precast concrete pipe pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114411717A CN114411717A (en) | 2022-04-29 |
| CN114411717B true CN114411717B (en) | 2023-07-25 |
Family
ID=81263763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210205287.6A Active CN114411717B (en) | 2022-03-03 | 2022-03-03 | Extension combined grouting precast concrete pipe pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114411717B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB370795A (en) * | 1931-08-24 | 1932-04-14 | Andrew Hood | Improvements in or relating to the construction of "in situ" concrete piles |
| CN102268868A (en) * | 2010-06-02 | 2011-12-07 | 中国京冶工程技术有限公司 | Repeated adaptive grouting system and construction method |
| CN103184734B (en) * | 2013-03-19 | 2015-08-19 | 浙江天润建设有限公司 | A kind of construction method implanting slip casting compound pile |
| CN206289627U (en) * | 2016-12-23 | 2017-06-30 | 化学工业岩土工程有限公司 | A kind of post jacking pile tube |
| CN112030944A (en) * | 2020-09-21 | 2020-12-04 | 中冶建工集团(天津)建设工程有限公司 | Side grouting construction method for cast-in-place pile |
| CN213682083U (en) * | 2020-10-30 | 2021-07-13 | 南京长江都市建筑设计股份有限公司 | Upper section tubular pile of spliced prefabricated tubular pile |
| CN113622418A (en) * | 2021-08-10 | 2021-11-09 | 上海市机械施工集团有限公司 | Prestressed concrete pipe pile structure and construction method |
-
2022
- 2022-03-03 CN CN202210205287.6A patent/CN114411717B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114411717A (en) | 2022-04-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102505684B (en) | Hollow stiffness-core slurry-solidified discrete material pile and construction method thereof | |
| CN112030964B (en) | Positioning grouting anchor rod suitable for engineering seepage damage prevention and control and construction method thereof | |
| CN100577923C (en) | Prestressed concrete steel pipe congruent pile and its manufacture and construction method | |
| CN111576403B (en) | Pile splicing structure and bearing platform anchoring structure using PHC tubular pile | |
| CN103556628B (en) | Spiral conical soil compaction pile construction method | |
| CN1206419C (en) | Combined rock-embedding pile and its construction method | |
| CN101793027B (en) | Core-grouted static pressure anchor rod pile | |
| CN111455973A (en) | Composite foundation structure of prefabricated solid CFG pile and construction method thereof | |
| CN113789779A (en) | Pile foundation structure applied to soft soil foundation and coral sand foundation and construction method | |
| CN114411717B (en) | Extension combined grouting precast concrete pipe pile | |
| CN104594343A (en) | Fabricated pile and construction method thereof | |
| CN106592587A (en) | Prefabricated PHC tube pile | |
| CN216865116U (en) | Post-grouting prefabricated pipe pile | |
| CN113699985B (en) | Post-grouting device for pile end of prefabricated pipe pile and construction method | |
| CN206495205U (en) | A kind of prefabricated PHC pile tubes | |
| CN101545255A (en) | Method for manufacturing a PHC tubular pile in soft soil region through chambering and grouting | |
| CN213233417U (en) | Combined pile and combined foundation | |
| CN103867219B (en) | A kind of Apparatus and method for expanding the pea gravel concreten anchoring support soil body for whirlpool extrusion | |
| CN218148294U (en) | High-pressure grouting type steel pipe pile | |
| CN204252127U (en) | A kind of assembling stake | |
| CN218090818U (en) | PHC tubular pile with special pile shoe | |
| CN203668917U (en) | High-rise and super high-rise super-strong grouting tension pre-formed pile | |
| CN110410084B (en) | Prefabricated steel-UHPC composite pipe curtain device and construction method | |
| CN204000837U (en) | A kind of prefabricated diaphragm wall | |
| CN212223839U (en) | Composite foundation structure of prefabricated solid CFG pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Yong Inventor after: Liu Wenshuo Inventor after: Cheng Lijuan Inventor after: Zhang Xin Inventor after: Chen Guang Inventor after: Gai Yongbin Inventor after: Qiao Qiuheng Inventor after: Liu Jun Inventor after: Wang Fen Inventor after: Liu Bin Inventor after: Zhou Xuan Inventor after: Wang Qing Inventor after: Zhou Yang Inventor after: Xu Ziran Inventor after: Li Yu Inventor after: Cui Jianfeng Inventor after: Xiao Xiangnan Inventor after: Su Miao Inventor after: Liu Rong Inventor after: Li Wenwu Inventor after: He Yaobei Inventor before: Liu Yong Inventor before: Liu Wenshuo Inventor before: Cheng Lijuan Inventor before: Zhang Xin Inventor before: Chen Guang Inventor before: Gai Yongbin Inventor before: Qiao Qiuheng Inventor before: Liu Jun Inventor before: Wang Fen Inventor before: Liu Bin Inventor before: Zhou Xuan Inventor before: Wang Qing Inventor before: Zhou Yang Inventor before: Xu Ziran Inventor before: Li Yu Inventor before: Cui Jianfeng Inventor before: Xiao Xiangnan Inventor before: Su Miao Inventor before: Liu Rong Inventor before: Li Wenwu Inventor before: He Yaobei |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |