CN114718081A - Prefabricated assembled recyclable foundation pit enclosure pile and construction method thereof - Google Patents
Prefabricated assembled recyclable foundation pit enclosure pile and construction method thereof Download PDFInfo
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- CN114718081A CN114718081A CN202210324180.3A CN202210324180A CN114718081A CN 114718081 A CN114718081 A CN 114718081A CN 202210324180 A CN202210324180 A CN 202210324180A CN 114718081 A CN114718081 A CN 114718081A
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- 238000010276 construction Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 17
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- 239000013049 sediment Substances 0.000 claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 14
- 239000011148 porous material Substances 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 238000009434 installation Methods 0.000 claims description 15
- 238000009412 basement excavation Methods 0.000 claims description 5
- 230000008520 organization Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- 210000002105 tongue Anatomy 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
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- 230000003014 reinforcing effect Effects 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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Abstract
The invention discloses an assembled recyclable foundation pit enclosure precast pile and a construction method thereof, and belongs to the field of building construction. The invention adopts the pile body component units to assemble and form the prefabricated pile for the assembled recyclable foundation pit enclosure, and the pile body module can flexibly combine the standard block, the adjusting block, the waist beam connecting block and the crown beam block to form a single pile with any height. And the pile body component unit also realizes the functions of discharging sediment and filling backfill soil by adopting the guide frame with the hollow pore passage. Therefore, in the construction process of the prefabricated pile for the prefabricated foundation pit enclosure which is assembled and recyclable, sediment at the bottom can be conveniently discharged, and meanwhile, after the construction of the basement is finished, all components can be recycled repeatedly and the pile holes are filled with backfill. The invention is suitable for different engineering projects, and the prefabricated enclosure precast pile assembly form can greatly save the cost and time required by construction.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to an assembled recyclable foundation pit enclosure precast pile and a construction method thereof.
Background
The foundation pit engineering enclosure structure is mainly divided into steel sheet piles, steel pipe piles, piles in an SMW construction method, piles in a TRD construction method, prefabricated pipe piles, pipe sinking cast-in-place piles, underground continuous walls and the like. Among them, the cast-in-situ bored pile has high rigidity, mature process and the most extensive application. From one layer to three layers of basements, cast-in-situ bored piles can be adopted as the building envelope. However, the foundation pit enclosure bored concrete pile has large material consumption and high cost, becomes a permanent hidden project after being used once, is difficult to reuse, and is contrary to the concepts of 'carbon peak reaching' and 'carbon neutralization'.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an assembled recyclable foundation pit enclosure precast pile and a construction method thereof.
The invention adopts the following specific technical scheme:
in a first aspect, the invention provides an assembled recyclable foundation pit enclosure precast pile, which comprises a plurality of pile body component units and a plurality of pile body component units, wherein the pile body component units are used for forming a foundation pit enclosure structure surrounding the outer edge of a foundation pit through splicing;
the pile body component unit comprises a guide frame and a pile body module;
the guide frame is provided with one or more guide rods, each guide rod is vertically arranged on the end plate base, hollow pore canals which are axially communicated are arranged in the guide rods, the top openings of the guide rods are used for connecting external pipelines, and the bottom openings of the guide rods are communicated with the lower surface of the end plate base;
the pile body module is divided into a standard block, a waist beam connecting block, an adjusting block and a crown beam block; each pile body module is provided with a mounting hole matched with the guide frame and can be sleeved on a guide rod of the guide frame through the mounting hole; the top surface of each pile body module is provided with a tongue-and-groove, and the bottom surface of each pile body module is provided with a groove matched with the tongue-and-groove; connecting pieces for connecting the foundation pit inner supports are arranged on the waist beam connecting block and the crown beam block, and the connecting pieces on the waist beam connecting block are recessed relative to the standard blocks below the waist beam connecting block; the two sides of each crown beam block are respectively provided with a tongue-and-groove and a groove which can be connected with other crown beam blocks;
the standard block, the waist beam connecting block, the adjusting block and the crown beam block are sleeved on each guide rod through combination to form a single pile; the crown beam block is arranged at the top of the pile body; the waist beam connecting block is arranged at a position on the pile body where a foundation pit inner support needs to be connected, and the connecting piece faces to the side of the foundation pit inner support; the adjusting block is arranged below the crown beam block and the waist beam connecting block and used for adjusting the height of the crown beam block and the waist beam connecting block to meet the design requirement; the rest positions except the waist beam connecting block, the adjusting block and the crown beam block in the whole single pile are all formed by the standard blocks, and the adjacent pile body modules on the upper part and the lower part of the single pile are all tightly spliced by the tongue-and-groove and the groove, so that the vertical continuity of the pile body is kept;
the crown beam blocks at the top of the pile body of all the pile body component units can be tightly spliced through the tongue-and-groove and the groove, so that the transverse continuity of all the crown beam blocks is maintained.
As a preferable aspect of the first aspect, the standard block, the wale connecting block and the crown beam block are all standard modules suitable for different projects; the adjusting block is a customized module aiming at target engineering and used for ensuring that the total pile body height after splicing and the positions of the waist beam connecting block and the crown beam block meet the design requirements.
Preferably, each guide frame is provided with a plurality of parallel guide rods, and the standard block, the wale connecting block and the adjusting block of the plurality of mono-piles assembled and formed on the single guide frame are independent, but the top crown block is an integrated member, so that the tops of the plurality of mono-piles are connected into a whole.
Preferably, the guide bar and the crown block are provided with hooks.
Preferably, the height of the crown beam block and the waist beam connecting block is 0.6-1.0 m, and the height of the standard block is 4-6 m.
As a preferable mode of the first aspect, the connecting member on the wale connecting block is an embedded steel plate for connecting a stressed steel bar of the foundation pit inner support.
Preferably, in the first aspect, the diameter of the mounting hole is slightly larger than the outer diameter of the guide rod, and the mounting hole and the guide rod form a clearance fit.
Preferably, the tongue and groove of the pile body module are both annular and are arranged coaxially with the pile body.
In a second aspect, the invention provides a construction method of the prefabricated assembly type recyclable foundation pit enclosure pile according to any one of the first aspect, comprising the following steps:
s1, mechanically forming holes according to the design position of a foundation pit enclosure precast pile of foundation pit engineering, further forming a series of pile holes annularly arranged along the edge of the foundation pit engineering on a foundation plane, and correspondingly installing a pile body member unit in each pile hole; after the components of all the pile body component units are transported to the site to be in place, hoisting and sinking all the guide frames into the corresponding pile holes respectively until the end plate bases of the guide frames sink into the hole bottom sediment;
s2, respectively connecting the top opening of each guide rod with external suction equipment through a pipeline for each pile hole, then sucking and discharging hole bottom sediment by using the suction equipment, further completing the cleaning of the hole bottom sediment and removing the pipeline connected with the top of each guide rod, wherein the end plate base of each guide frame is supported on the hole bottom foundation;
s3, pile body module assembling operation is carried out on the first pile hole, a standard block is continuously assembled on a guide frame through a hoisting device and sinks into the pile hole along a guide rod to be continuously assembled block by block, when the standard block is close to the installation position of a foundation pit inner support, a pre-customized adjusting block is required to be assembled on the guide frame and sinks into the pile hole along the guide rod, a waist beam connecting block is hoisted to be assembled on the guide frame and sinks into the pile hole along the guide rod, the assembly height of the waist beam connecting block on the adjusting block below just meets the installation height of the corresponding foundation pit inner support, finally, a pre-customized adjusting block and a top beam block are installed, connecting pieces on the waist beam connecting block and the top beam block are required to face the side of the foundation pit inner support, all pile body modules are vertically and tightly spliced through a tongue-and groove, and the assembling operation of a single pile is completed; sequentially carrying out the same pile body module assembly operation on each pile hole along the arrangement direction of the pile hole plane, and tightly splicing the crown beam blocks at the tops of the adjacent single piles through the tongue-and-groove and the groove to form a continuous beam so as to complete the construction of the integral foundation pit enclosure precast pile;
s4, performing soil excavation on the foundation pit in the enclosed area of the foundation pit enclosure precast pile according to the construction organization scheme of the foundation pit, constructing all foundation pit supports in sequence from top to bottom, and connecting and fixing each foundation pit support on a connecting piece of the crown beam block or the waist beam connecting block at the corresponding height through a stressed steel bar at the end part until the foundation pit is excavated to the bottom of the foundation pit;
s5, after the foundation pit is excavated, constructing the basement, removing the foundation pit inner supports B one by one in the construction process, and after the construction of the basement is finished, backfilling soil bodies in the space between the periphery of the basement and the foundation pit enclosure precast pile;
s6, sequentially carrying out single pile removing operation on all pile holes in sequence along the direction of the foundation pit enclosure precast pile, when carrying out single pile removing operation on each pile hole, firstly recovering a crown beam block by using lifting equipment, then integrally lifting the guide frame and the rest pile body modules arranged on the guide frame, continuously injecting backfill into the pore passages in the guide rods in the lifting process to fill the pile holes below the end plate base, finally completely taking out the guide frame and all the pile body modules, and simultaneously filling the backfill into the whole pile holes of the pile holes;
and S7, after the single pile dismantling operation of all the pile holes is completed, the guide frame and all the pile body modules are recovered and transported for the construction of the next project.
Preferably, the pile body modules are prefabricated in a factory and then transported to a project site for installation.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts the pile body component units to assemble and form the prefabricated pile for the assembled recyclable foundation pit enclosure, and the pile body module can flexibly combine the standard block, the adjusting block, the waist beam connecting block and the crown beam block to form a single pile with any height. And the pile body component unit also adopts the guide frame with the hollow pore canal, thereby realizing the functions of discharging sediment and filling backfill soil. Therefore, in the construction process of the prefabricated pile for the prefabricated foundation pit enclosure which is assembled and recyclable, sediment at the bottom can be conveniently discharged, and meanwhile, after the construction of the basement is finished, all components can be recycled repeatedly and the pile holes are filled with backfill. The invention is suitable for different engineering projects, and the prefabricated enclosure precast pile assembly form can greatly save the cost and time required by construction.
Drawings
FIG. 1 is a plan view of an assembled recyclable foundation pit enclosure precast pile;
FIG. 2 is an elevation view of a composite pile formed of three single piles;
fig. 3 is a sectional view of the assembled state of the individual shaft component units;
FIG. 4 is a cross-sectional view of the guide frame;
fig. 5 is a cross-sectional view of each shaft module in a single shaft unit;
FIG. 6 is a flow chart of a construction method of an assembled recyclable foundation pit enclosure precast pile.
The reference numbers in the figures are: the foundation pit comprises a pile position A, a foundation pit inner support B, a pit outer W, a pit inner N, a guide frame 1, a standard block 2, an adjusting block 3, a waist beam connecting block 4, a crown beam block 5, a pre-buried steel plate 6, a rabbet 7, a pile hole 8, sediment 9, a lifting rope 10, a pipeline 11, a waist beam 12, a foundation pit bottom 13, a basement 14, backfill soil 15, an end plate base 101, a guide rod 102, a hollow pore passage 103 and a lifting hook 104.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The technical characteristics in the embodiments of the present invention can be combined correspondingly without mutual conflict.
In the description of the present invention, it should be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element, i.e., intervening elements may be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.
In a preferred embodiment of the invention, the invention provides an assembled recyclable foundation pit enclosure precast pile which comprises a plurality of pile member units, wherein each pile member unit can form a foundation pit enclosure surrounding the outer edge of a foundation pit through assembled splicing. Referring to fig. 1, a series of pile holes can be pre-formed in the whole foundation pit enclosure precast pile according to a designed pile position a, each pile hole is correspondingly provided with a pile body component unit, then, each component in the pile body component units is assembled to form a single pile, and all the single piles are continuously assembled to form the corresponding foundation pit enclosure precast pile. And a connecting piece capable of being temporarily connected with a foundation pit inner support B required by basement construction needs to be arranged in the foundation pit enclosure precast pile.
The specific structure of the individual shaft member units is described in detail below.
As shown in fig. 2, the pile member unit includes two parts of a guide frame 1 and a pile module, wherein the guide frame 1 serves to provide an installation foundation for the pile module and simultaneously provide a passage for discharging sediment and filling backfill soil, and the pile module serves to form a single pile by flexible assembly.
One or more guide rods can be arranged on the guide frame, and each guide rod is vertically arranged on the end plate base. In the embodiment shown in fig. 2, the guide frame 1 has three guide rods 102, and the three guide rods 102 are all vertically mounted on the end plate base 101, and each guide rod 102 can form a single pile. The construction of the mono pile is shown in fig. 3. Further, as shown in fig. 4, the end plate base 101 of the guide frame 1 may be formed by machining a steel plate, and a hole may be formed at a position where the guide bar 102 is coupled. The guide rod 102 is designed as a hollow rod, i.e. it has an axially through hollow bore 103, the top opening of which is used for connecting the external pipe 11, and the bottom opening of which is communicated with the lower surface of the end plate base 101 through an opening on the end plate base 101. Thus, the sludge at the lower part of the end plate base 101 can be sucked through the hollow duct 103, and the backfill 15 can be injected into the lower part of the end plate base 101 through the hollow duct 103. In addition, in order to facilitate the integral hoisting of the guide frame 1, hoisting connectors such as a hook 104 can be arranged on the top of the guide rod 102, and subsequent hoisting equipment can be connected with the hook 104 through a hoisting rope 10 such as a steel wire, so as to perform hoisting operation on the guide frame 1.
As shown in fig. 5, the pile body module is divided into a standard block 2, a wale connecting block 4, an adjusting block 3 and a crown beam block 5. The four pile body modules, namely the standard block 2, the waist beam connecting block 4, the adjusting block 3 and the crown beam block 5, are provided with mounting holes matched with the guide frame 1, so that the pile body modules can be sleeved on the guide rod 102 of the guide frame 1 through the mounting holes. Because the guide frame 1 in this embodiment has three guide rods 102, and each pile body module is correspondingly provided with one mounting hole, a combined pile formed by three single piles is actually assembled on one guide frame 1. The standard block, the waist beam connecting block and the adjusting block of a plurality of single piles assembled and formed on a single guide frame are independent, but the top crown beam block adopts an integrated component, so that the tops of the plurality of single piles can be connected into a whole. Of course, in other embodiments, other numbers of guide rods 102, such as 1, 2, 4 or more, may be disposed on the guide frame 1, so as to form different numbers of mono-piles as shown in fig. 3. However, in general, three monopiles form a group, which has high flexibility and can meet common use requirements.
In addition, because the pile body modules are assembled by splicing, in order to ensure the sealing performance of the splicing seam, the top surface of each pile body module is provided with a groove 7, and the bottom surface side surface of each pile body module is provided with a groove matched with the groove 7. Therefore, the pile body modules on the same single pile can be spliced up and down tightly to form a continuous pile body.
In addition, in order to avoid horizontal shaking of the pile body module on the guide frame 1, the diameter of the mounting hole on the controllable pile body module is slightly larger than the outer diameter of the guide rod 102, so that clearance fit can be formed between the pile body module and the guide rod 102, horizontal displacement is reduced under the condition of not influencing assembly, and smooth realization of the assembly process is ensured. The guide rod 102 preferably has an outer diameter of 200 mm.
In addition, in the process of excavating the foundation pit in the basement construction, in order to ensure the stability of the foundation pit surrounding precast pile and improve the capability of the foundation pit surrounding precast pile for resisting the lateral load of the W outside the pit, the foundation pit inner support B is required to be arranged on the foundation pit surrounding precast pile. The foundation pit inner support B is often provided with a plurality of supports, the uppermost support is arranged on the crown beam which is level with the ground, and the rest supports are arranged below the ground. Therefore, in order to connect the foundation pit inner support B, the connecting pieces for connecting the foundation pit inner support B can be arranged on the waist beam connecting blocks 4 and the crown beam blocks 5. The concrete form of connecting piece is not limited, and in this embodiment, the connecting piece on waist rail connecting block 4 can adopt pre-buried steel sheet 6, can support the tip atress reinforcing bar welding of B on the foundation ditch on pre-buried steel sheet 6 when supporting B in the construction foundation ditch, forms stable whole atress system. When the foundation pit inner support B is dismantled, the stressed reinforcing steel bars at the end part of the foundation pit inner support B can be sheared or cut off.
Referring to fig. 2 and 3, the standard block 2, the wale connecting block 4, the adjusting block 3 and the crown beam block 5 are sleeved on the guide frame 1 through combination to form a single pile. Wherein the standard block 2 is a main pile body module forming a single pile. The crown beam block 5 is arranged at the top of the pile body and used for being connected to form a crown beam structure of the foundation pit enclosure precast pile. The waist rail connecting block 4 is arranged at a position on the pile body where the foundation pit inner support B needs to be connected, and the connecting piece needs to face the side of the foundation pit inner support B. Because the crown beam block 5 and the waist beam connecting block 4 play a role in connecting the support B in the foundation pit, and the design elevation of the support B in the foundation pit is calculated and determined according to related designs and cannot be adjusted at will, the adjusting block 3 with the height inconsistent with that of the standard block 2 is introduced in order to ensure that the crown beam block 5 and the waist beam connecting block 4 can be just positioned at the height position required by the support B in the foundation pit. The adjusting block 3 is arranged below the crown beam block 5 and the waist beam connecting block 4 and used for adjusting the height of the crown beam block 5 and the waist beam connecting block 4 to meet the design requirement. All the positions except the waist beam connecting block 4, the adjusting block 3 and the crown beam block 5 in the whole single pile are formed by the standard blocks 2, and the adjacent pile body modules above and below the single pile are tightly spliced through the tongue-and-groove 7 and the groove, so that the vertical continuity of the pile body is maintained.
It should be noted that the standard block 2, the wale connecting block 4 and the crown beam block 5 are all standard modules suitable for different projects. However, the adjusting blocks 3 are generally customized modules for target engineering, and are used for ensuring that the total pile body height after splicing and the positions of the waist beam connecting blocks 4 and the crown beam blocks meet the design requirements, and the number, the height and the positions of the adjusting blocks are determined according to actual conditions. Certainly, the used adjusting block 3 of a certain factory can also be stored, and can also be directly used when other just applicable projects exist, so that the customization cost is reduced. The height of the adjusting blocks 3 is smaller than that of the standard blocks 2.
In addition, as a preferable example of the present invention, the height of the crown beam block 5 and the wale connecting block 4 is 0.6 to 1.0 m, and the height is preferably 0.8 m; and the height of the standard block 2 is 4-6 meters, preferably 5 meters. The diameter of the single pile can be adjusted according to the actual design requirement. In the above embodiment of the present invention, in which three single piles are used as a group, the height, width and length of the crown beam block 5 can be respectively designed to be 0.8 m, 1.2 m and 3.6 m, and the height and width of the waist beam connecting block 4 can be respectively designed to be 0.8 m and 0.9 m.
The whole foundation pit enclosure precast pile is assembled through a series of single piles, and a top beam is required to provide a connecting effect in the horizontal direction so as to resist the lateral force applied by soil mass outside the pit W to the single pile and towards the inside of the pit N. In the case of a guide frame 1 with a plurality of mono-piles, the crown blocks 5 at the top of each mono-pile may be independent or may be integrally cast. At the time, all the single-pile-top crown blocks 5 need to be able to form a continuous beam by fitting, regardless of whether each single-pile-top crown block 5 is individually or integrally cast. Therefore, in this embodiment, one side of each of the crown blocks needs to be provided with a tongue-and-groove, and the other side needs to be provided with a groove matched with the tongue-and-groove, so that each crown block can be coupled with other adjacent crown blocks through the tongue-and-groove and the groove.
In addition, in order to facilitate the hoisting of the crown beam block 5, the crown beam block 5 can also be provided with a corresponding lifting hook, and the rest pile body modules can also be provided with lifting hooks as required.
In addition, the pre-buried steel plate 6 on the crown beam block 5 can be directly connected with the foundation pit inner support B, and the pre-buried steel plate 6 of the waist beam connecting block 4 at the waist position of the pile body can also be indirectly connected with the foundation pit inner support B through the waist beam 12, and the determination can be specifically carried out according to the actual design and the construction scheme. Further, as shown in fig. 3, in order to provide a corresponding supporting point for the wale 12, the connecting member on the wale connecting block 4 is recessed relative to the standard block 3 below the wale connecting block 4, so as to form a supporting surface at the connecting position of the two, and the end of the wale 12 can be supported on the supporting surface in addition to being welded with the embedded steel plate 6.
The concrete sizes and forms of the grooves and the tongues adopted in the invention can be adjusted according to actual needs. In a preferred embodiment of the invention, in order to prevent a through seam which is easy to leak from occurring between the upper pile body module and the lower pile body module, a circle of annular tongue-and-groove (both 100mm in height and width) coaxial with the pile body is arranged on the upper top surface of each pile body module, and a circle of annular groove (both 100mm in depth and width) coaxial with the pile body is reserved on the lower bottom surface of each pile body module. Preferably, in order to ensure that the crown blocks 5 are connected to form a continuous beam capable of bearing transverse force, the tongue and groove on the crown blocks 5 can be specially designed so that the tongue and groove cannot be separated under the action of horizontal force. Therefore, the pile body top crown beam blocks 5 of all the pile body component units can be tightly spliced through the tongue-and-groove and the groove, and the transverse continuity of all the crown beam blocks 5 is kept.
In addition, as shown in fig. 1, because the foundation pit enclosure precast pile is usually in a rectangular layout, the plane arrangement form of the single pile can be arranged according to the outer edge of the foundation pit, so as to form a rectangular enclosure structure. Of course, if the foundation pit enclosure precast pile is in other special shapes, other plane arrangement forms can be adopted.
As shown in fig. 6, based on the fabricated recyclable foundation pit bracing precast pile, the invention may further provide a construction method of the fabricated recyclable foundation pit bracing precast pile, which comprises the following construction process flows: mechanical hole forming, sinking of a guide frame → installation of a pipeline, extraction of sediment through a pore channel → installation of each module → construction of an inner support, excavation of earthwork → construction of a basement, backfilling around soil → recovery of a crown beam block → recovery of other modules, backfilling through the pore channel → completion of recovery, and backfilling. The specific steps of the construction method are described in detail as follows:
s1, mechanically forming holes according to the design position of a foundation pit enclosure precast pile of foundation pit engineering, further forming a series of pile holes 8 which are annularly arranged along the edge of the foundation pit engineering on a foundation plane, and correspondingly installing a pile body component unit in each pile hole 8; after the components of all the pile body member units are transported to the site and put in place, all the guide frames 1 are respectively hoisted by hoisting equipment and sunk into the corresponding pile holes 8 until the end plate bases 101 of the guide frames 1 are submerged into the hole bottom sediments 9, and one guide frame 1 is sunk into each pile hole 8, as shown in (a) of fig. 6.
It should be noted that, the pile body modules are all prefabricated in a factory and then transported to a project site for installation. The hoisting equipment adopted in the invention can be equipment such as an automobile crane, a tower crane and the like, and is not limited.
S2, for each pile hole 8, respectively connecting the top opening of the guide rod 102 to an external suction device through a pipeline 11, then sucking and discharging the bottom sediments 9 by using the suction device, further completing cleaning of the bottom sediments 9 and removing the pipeline 11 connected to the top of the guide rod 102, and the end plate base 101 of the guide frame 1 props up on the foundation at the bottom of the pile hole 8, as shown in (b) of fig. 6.
It should be noted that the external suction device used in the present invention may be a powerful negative pressure suction pump.
S3, carrying out pile body module assembling operation on the first pile hole 8, continuously assembling the standard block 2 on the guide frame 1 by a hoisting device and sinking into the pile hole 8 along the guide rod 102 for continuous assembling block by block, when approaching the installation position of a foundation pit inner support B, assembling the pre-customized adjusting block 3 on the guide frame 1 and sinking into the pile hole 8 along the guide rod 102, hoisting a wale connecting block 4 to the guide frame 1 and sinking into the pile hole 8 along the guide rod 102, enabling the assembly height of the wale connecting block 4 on the lower adjusting block 3 to just meet the installation height of the corresponding foundation pit inner support B, finally installing the pre-customized adjusting block 3 and the top crown beam block 5, enabling connecting pieces on the wale connecting block 4 and the crown beam block 5 to face to the side of the foundation pit inner support B, and tightly splicing all pile body modules with grooves through grooves and grooves in the vertical direction, completing the assembly operation of the single pile; and (3) sequentially carrying out the same pile body module assembly operation on each pile hole 8 along the direction of the pile hole 8 of the foundation pit enclosure precast pile, and tightly splicing the transverse crown beam blocks 5 at the tops of the adjacent single piles through the rabbet 7 and the groove to complete the construction of the integral foundation pit enclosure precast pile, as shown in (c) in fig. 6.
It should be noted that the shaft module assembly process flow in different pile holes 8 is basically similar, but the specific installation position and number of the wale connecting blocks 4 may be different. This is because in the single piles corresponding to different pile holes 8, there may be a difference in the position where the foundation pit inner support B needs to be set, and part of the single piles may not need to be connected to the foundation pit inner support B. To each pile hole 8, can calculate wherein required waist rail connecting block 4 quantity and mounting height according to the construction drawing in advance, then calculate the height that corresponds required regulating block 3, and then customize the regulating block 3 of waist rail connecting block 4 below in advance, also need customize according to holistic single pile shaft height to waist rail connecting block 4 of crown beam piece 5 below simultaneously, guarantee that the single pile after the equipment finishes satisfies the foundation ditch enclosure precast pile design form of this pile hole 8 position.
In order to ensure the smooth operation of the installation process, all pile body modules can be numbered in sequence for each pile hole 8, and the pile body modules can be hoisted in sequence in the construction process.
S4, performing soil excavation on the foundation pit in the enclosed area of the foundation pit enclosure precast pile according to the construction organization scheme of the foundation pit, constructing all foundation pit inner supports B in sequence from top to bottom, and connecting and fixing each foundation pit inner support B on the pre-embedded steel plate 6 of the crown beam block 5 or the waist beam connecting block 4 at the corresponding height through the stressed steel bars at the end part until the foundation pit is excavated to the bottom 13 of the foundation pit, as shown in (d) of FIG. 6.
It should be noted that the construction organization scheme for excavation of the foundation pit soil body may be determined according to the related design specifications and the design scheme of the project, which belongs to the prior art and is not the key point of the present invention, and thus, the details are not repeated. The construction method of the foundation pit inner support B can also be carried out according to the related design specifications and the design scheme of the project.
S5, after the foundation pit is excavated, constructing the basement 14, removing the foundation pit inner supports B one by one in the construction process, and after the basement 14 is constructed, backfilling soil bodies in the space between the periphery of the basement 14 and the foundation pit enclosure precast pile, as shown in (e) in FIG. 6;
it should be noted that the support B in the foundation pit is removed from track to track along with the construction process of the basement 14, and generally starts to be removed from bottom to top. When the foundation pit inner support B is removed, the stressed steel bars at the end part can be sheared or cut off, so that the steel bars are separated from the embedded steel plate 6. In order to enable the waist rail connecting block 4 to be repeatedly used, when the stressed steel bars are cut off or cut off, the embedded steel plates 6 should be prevented from being damaged, and the welding parts of the embedded steel plates 6 can be ground flat through processing after being subsequently recovered.
S6, sequentially performing single-pile demolition operations on all pile holes 8 in sequence along the direction of the foundation pit enclosure precast pile, when performing the single-pile demolition operation on each pile hole 8, first recovering the crown block 5 by using the hoisting device and the hoisting rope 10, as shown in (f) of fig. 6, then slowly and integrally hoisting the guide frame 1 and the rest of the pile body modules installed on the guide frame 1, continuously injecting backfill 15 into the pore channel in the guide rod 102 during the hoisting process to fill up the pile holes 8 below the end plate base 101, as shown in (g) of fig. 6, finally completely taking out the guide frame 1 and all the pile body modules, and simultaneously filling up the entire pile holes 8 of the pile holes 8 with the backfill 15, as shown in (h) of fig. 6.
It should be noted that, the rising speed of leading truck 1 should not be too fast in this process to guarantee that backfill soil 15 can in time fill up the stake hole 8 of end plate base 101 below after leading truck 1 pile body module removes, avoid appearing stake hole 8 and appear destroying because of the side direction load.
And S7, after the single pile dismantling operation of all the pile holes 8 is completed, the guide frame 1 and all the pile body modules are recovered and transported for the construction of the next project. All the single piles in the foundation pit enclosure precast pile can be dismantled one by the crown beam block 5 and other pile body components, and also can be dismantled one by one after the crown beam block 5 is recovered. However, if a plurality of composite piles, in which single piles are assembled on the same guide frame 1, are used, the composite piles need to be removed as a unit.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (10)
1. An assembled recyclable foundation pit enclosure precast pile is characterized by comprising a plurality of pile body component units, a pile body component unit and a pile body component unit, wherein the pile body component units are used for forming a foundation pit enclosure structure surrounding the outer edge of a foundation pit through splicing;
the pile body component unit comprises a guide frame and a pile body module;
the guide frame is provided with one or more guide rods, each guide rod is vertically arranged on the end plate base, an axially through hollow pore passage is formed in each guide rod, the top opening of each guide rod is used for connecting an external pipeline, and the bottom opening of each guide rod is communicated with the lower surface of the end plate base;
the pile body module is divided into a standard block, a waist beam connecting block, an adjusting block and a crown beam block; each pile body module is provided with a mounting hole matched with the guide frame and can be sleeved on a guide rod of the guide frame through the mounting hole; the top surface of each pile body module is provided with a tongue-and-groove, and the bottom surface of each pile body module is provided with a groove matched with the tongue-and-groove; connecting pieces for connecting the foundation pit inner supports are arranged on the waist beam connecting block and the crown beam block, and the connecting pieces on the waist beam connecting block are recessed relative to the standard blocks below the waist beam connecting block; the two sides of each crown beam block are respectively provided with a tongue-and-groove and a groove which can be connected with other crown beam blocks;
the standard block, the waist beam connecting block, the adjusting block and the crown beam block are sleeved on each guide rod through combination to form a single pile; the crown beam block is arranged at the top of the pile body; the waist beam connecting block is arranged at a position on the pile body where a foundation pit inner support needs to be connected, and the connecting piece faces to the side of the foundation pit inner support; the adjusting block is arranged below the crown beam block and the waist beam connecting block and used for adjusting the height of the crown beam block and the waist beam connecting block to meet the design requirement; the rest positions except the waist beam connecting block, the adjusting block and the crown beam block in the whole single pile are all formed by the standard blocks, and the adjacent pile body modules on the upper part and the lower part of the single pile are all tightly spliced by the tongue-and-groove and the groove, so that the vertical continuity of the pile body is kept;
the crown beam blocks at the top of the pile body of all the pile body component units can be tightly spliced through the tongue-and-groove and the groove, so that the transverse continuity of all the crown beam blocks is maintained.
2. The prefabricated pile for an assembled recyclable foundation pit according to claim 1, wherein the standard block, the wale connecting block and the crown beam block are standard modules suitable for different projects; the adjusting block is a customized module aiming at target engineering and used for ensuring that the total pile body height after splicing and the positions of the waist beam connecting block and the crown beam block meet the design requirements.
3. The prefabricated assembled recoverable foundation pit support pile of claim 1, wherein each of the guide frames has a plurality of parallel guide rods, and the standard block, the wale connecting block and the adjusting block of the plurality of single piles assembled and formed on the single guide frame are independent, but the top crown block is an integrated member, so that the tops of the plurality of single piles are connected into a whole.
4. The prefabricated assembled recyclable foundation pit support pile of claim 1, wherein the guide rods and the crown beam block are provided with hooks.
5. The prefabricated pile for the assembled recyclable foundation pit support according to claim 1, wherein the height of the crown beam blocks and the waist beam connecting blocks is 0.6-1.0 m, and the height of the standard blocks is 4-6 m.
6. The prefabricated pile for an assembled recyclable foundation pit support of claim 1, wherein the connecting piece on the wale connecting block is an embedded steel plate for connecting a stressed steel bar of the foundation pit support.
7. The prefabricated assembled recoverable foundation pit support pile of claim 1, wherein the diameter of the installation hole is slightly larger than the outer diameter of the guide rod, and the installation hole and the guide rod form a clearance fit.
8. The prefabricated assembled recoverable foundation pit enclosure pile of claim 1, wherein the tongue and groove of the pile body module are both annular and are arranged coaxially with the pile body.
9. The construction method of the fabricated recyclable foundation pit enclosure precast pile as claimed in claims 1 to 8 is characterized by comprising the following steps:
s1, mechanically forming holes according to the design position of a foundation pit enclosure precast pile of foundation pit engineering, further forming a series of pile holes annularly arranged along the edge of the foundation pit engineering on a foundation plane, and correspondingly installing a pile body member unit in each pile hole; after the components of all the pile body component units are transported to the site to be in place, hoisting and sinking all the guide frames into the corresponding pile holes respectively until the end plate bases of the guide frames sink into the hole bottom sediment;
s2, respectively connecting the top opening of each guide rod with external suction equipment through a pipeline for each pile hole, then sucking and discharging hole bottom sediment by using the suction equipment, further completing the cleaning of the hole bottom sediment and removing the pipeline connected with the top of each guide rod, wherein the end plate base of each guide frame is supported on the hole bottom foundation;
s3, pile body module assembling operation is carried out on the first pile hole, a standard block is continuously assembled on a guide frame through a hoisting device and sinks into the pile hole along a guide rod to be continuously assembled block by block, when the standard block is close to the installation position of a foundation pit inner support, a pre-customized adjusting block is required to be assembled on the guide frame and sinks into the pile hole along the guide rod, a waist beam connecting block is hoisted to be assembled on the guide frame and sinks into the pile hole along the guide rod, the assembly height of the waist beam connecting block on the adjusting block below just meets the installation height of the corresponding foundation pit inner support, finally, a pre-customized adjusting block and a top beam block are installed, connecting pieces on the waist beam connecting block and the top beam block are required to face the side of the foundation pit inner support, all pile body modules are vertically and tightly spliced through a tongue-and groove, and the assembling operation of a single pile is completed; sequentially carrying out the same pile body module assembly operation on each pile hole along the arrangement direction of the pile hole plane, and tightly splicing the crown beam blocks at the tops of the adjacent single piles through the tongue-and-groove and the groove to form a continuous beam so as to complete the construction of the integral foundation pit enclosure precast pile;
s4, performing soil excavation on the foundation pit in the enclosed area of the foundation pit enclosure precast pile according to the construction organization scheme of the foundation pit, constructing all foundation pit supports in sequence from top to bottom, and connecting and fixing each foundation pit support on a connecting piece of the crown beam block or the waist beam connecting block at the corresponding height through a stressed steel bar at the end part until the foundation pit is excavated to the bottom of the foundation pit;
s5, after the foundation pit is excavated, constructing the basement, removing the foundation pit inner supports B one by one in the construction process, and after the construction of the basement is finished, backfilling soil bodies in the space between the periphery of the basement and the foundation pit enclosure precast pile;
s6, sequentially carrying out single pile removing operation on all pile holes in sequence along the direction of the foundation pit enclosure precast pile, when carrying out single pile removing operation on each pile hole, firstly recovering a crown beam block by using lifting equipment, then integrally lifting the guide frame and the rest pile body modules arranged on the guide frame, continuously injecting backfill into the pore passages in the guide rods in the lifting process to fill the pile holes below the end plate base, finally completely taking out the guide frame and all the pile body modules, and simultaneously filling the backfill into the whole pile holes of the pile holes;
and S7, after the single pile dismantling operation of all the pile holes is completed, the guide frame and all the pile body modules are recovered and transported for the construction of the next project.
10. The method of claim 9, wherein the shaft modules are prefabricated at a factory and then transported to a project site for installation.
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