CN117626963A - Height control device suitable for CFG pile top reserved pile and construction method - Google Patents
Height control device suitable for CFG pile top reserved pile and construction method Download PDFInfo
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- CN117626963A CN117626963A CN202311621013.6A CN202311621013A CN117626963A CN 117626963 A CN117626963 A CN 117626963A CN 202311621013 A CN202311621013 A CN 202311621013A CN 117626963 A CN117626963 A CN 117626963A
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000004567 concrete Substances 0.000 claims abstract description 30
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- 238000009434 installation Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 10
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 10
- 241001330002 Bambuseae Species 0.000 claims description 10
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 10
- 239000011425 bamboo Substances 0.000 claims description 10
- 239000002689 soil Substances 0.000 claims description 7
- 239000002985 plastic film Substances 0.000 claims description 6
- 229920006255 plastic film Polymers 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000003550 marker Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000011800 void material Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000004873 anchoring Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 6
- 238000005553 drilling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a height control device and a construction method for a reserved pile at the top of a CFG pile, wherein the control device comprises a precast block, an auxiliary rod, a iron wire and an anchor nail; the precast block comprises an outer pipe and an inner pipe which are concentrically arranged, the diameter of the outer pipe is consistent with the pile diameter of the CFG pile, and a concrete filling layer is arranged between the outer pipe and the inner pipe; the upper end of the auxiliary rod is provided with a hollow pile pre-control length marking line; one end of the iron wire is penetrated and arranged in the central hole of the inner tube of the precast block and is fixed, the other end of the iron wire is fixedly connected with the anchoring nail, and the anchoring nail is anchored on the ground. The invention has the advantages of high installation speed, simple operation and lower construction difficulty, can be manufactured on site according to the sizes and the number of different CFG pile diameters, is simple to manufacture, can compact concrete by lowering precast blocks, and can simply and conveniently break pile heads after earthwork is excavated, thereby improving the installation efficiency and ensuring that the construction quality accords with the design intention.
Description
Technical Field
The invention relates to the technical field of height control of a reserved pile at the top of a CFG pile, in particular to a height control device suitable for the reserved pile at the top of the CFG pile and a construction method.
Background
The cement flyash stone pile, CFG pile for short, is made up by mixing broken stone, stone dust and flyash with proper quantity of cement and water, and is made up by using pile-forming machine tool. The CFG pile composite foundation is one of the most widely applied foundation treatment methods at present and is also the most effective foundation treatment method, and has the advantages of economical cost, reasonable quality and shorter construction period. Among four pile-forming processes of CFG piles, a vibration pipe sinking method and a long auger pipe internal pump material CFG pile method are widely applied at present. The vibration tube sinking method is used for drilling and piling in place in one step, the piling quality is reliable, but the process is complex and the cost is high. Therefore, the long spiral pipe inner pump material CFG drilling machine pile forming process is more suitable for soil layers with higher penetrability requirements such as cohesive soil, compact sand and the like and places with more strict pollution to noise concrete and mud: firstly, long spiral drilling is used for reaching the designed preset depth, then the drill rod is lifted, meanwhile, the mixture is pressed into the hole by using a high-pressure pump through the inner pipe of the long spiral drill rod of the high-pressure pipeline to form a pile, and the self-tightness of concrete is utilized for meeting the requirements of strength and pile body bearing capacity.
In the construction process of CFG piles and box culverts, CFG piles are generally constructed firstly, then earth excavation is carried out, pile heads are cleaned, then box culvert construction is carried out, CFG pile tops of the box culverts are generally located in soil layers, and a certain height difference exists between actual pile top elevation (including the over-filling height of 0.5-1 m) and the original ground elevation. However, due to the fact that field constructors judge the pile by experience and the difference of the levels, pile top elevation errors are extremely large, and the height of the overspray is often more than 2 m. The problem of pile overspray not only causes the waste of concrete materials, but also causes the difficulty of earth excavation and additionally increases the pile head breaking and outward transport cost, thereby greatly increasing the engineering cost. Therefore, the effective control of the empty pile height (the height difference between the actual pile top elevation and the original ground elevation) can reduce the pile head breaking and outward transport cost, and is particularly important for cost reduction and efficiency improvement.
Disclosure of Invention
The invention provides a height control device and a construction method suitable for CFG pile top reserved empty piles, which are capable of customizing CFG pile top reserved empty piles in a batch mode, and are used for solving the problem that the height of the CFG pile top reserved empty piles is difficult to control in the construction process of CFG piles and box culverts, effectively reducing pile head breaking and outward transport costs and shortening construction period.
The invention adopts the following technical scheme to realize the aim:
the height control device suitable for the reserved pile at the top of the CFG pile comprises a precast block, an auxiliary rod, a iron wire and an anchor nail; the precast block comprises an outer pipe and an inner pipe which are concentrically arranged, the diameter of the outer pipe is consistent with the pile diameter of the CFG pile, and a concrete filling layer is arranged between the outer pipe and the inner pipe; the upper end of the auxiliary rod is provided with a hollow pile pre-control length marking line; one end of the iron wire is penetrated and arranged in the central hole of the inner tube of the precast block and is fixed, the other end of the iron wire is fixedly connected with the anchoring nail, and the anchoring nail is anchored on the ground.
The construction method of the height control device suitable for the reserved pile at the top of the CFG pile comprises the following specific steps:
s1, preparation:
s11, according to a construction drawing, manufacturing an outer pipe with the diameter identical to the pile diameter of the CFG pile by using a PVC pipe, manufacturing an inner pipe by using a PVC pipe with the inner diameter of 75mm, placing plastic films on a prefabricated platform, placing the outer pipe on the plastic films, centering the inner pipe in the outer pipe to form a concentric circle, pouring C20 concrete into a gap between the outer pipe and the inner pipe to form a concrete filling layer, and preparing the prefabricated block;
s12, in a woodworking processing area, cutting the bamboo poles into sections longer than the pre-control height of the empty piles, and marking mark lines of the pre-control length of the empty piles at the upper ends of the sections of the bamboo poles to obtain auxiliary rods;
s13, preparing a wire and an anchor nail, and fully preparing for field installation;
s2, site construction:
s21, pile driver removing:
after the CFG pile is poured with concrete to the actual pile top elevation, the pile machine continuously idles to the original ground elevation until the CFG pile is removed;
s22, lowering the precast block to a specified position:
the CFG pile is poured with concrete to an excess pouring quantity of 0.5-1m, an iron wire is fixed after passing through a central hole of the precast block, a cylindrical precast block tied with the iron wire is extruded downwards from a pile hole by using an auxiliary rod, and the round end face of the precast block faces downwards, so that the mark line of the pre-control length of the empty pile on the auxiliary rod is consistent with the elevation of the ground;
s23, fixing the precast block and pulling out the auxiliary rod:
and then fixing the anchor nails on the peripheral solid ground to prevent the precast block from sinking along with the soil body, and after the anchor nails are fixed, pulling out the auxiliary rod, wherein the auxiliary rod can be recycled.
The beneficial effects of the invention are as follows: the invention has the advantages of high installation speed, simple operation and lower construction difficulty, can be manufactured on site according to the sizes and the number of different CFG pile diameters, is simple to manufacture, can compact concrete by lowering precast blocks, and can simply and conveniently break pile heads after earthwork is excavated, thereby improving the installation efficiency and ensuring that the construction quality accords with the design intention.
Drawings
FIG. 1 is a schematic diagram of the present invention in construction;
FIG. 2 is a front view of a prefabricated section according to the present invention;
FIG. 3 is a top view of a prefabricated section according to the present invention;
FIG. 4 is a schematic view of an auxiliary lever according to the present invention;
in the figure: 1-a prefabricated block; 2-an auxiliary rod; 3-iron wire; 4-anchoring nails; 5-CFG piles;
101-an outer tube; 102-an inner tube; 103-a concrete filling layer;
201, empty pile pre-control length marking lines;
the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 to 4, the height control device for the reserved pile at the top of the CFG pile comprises a precast block 1, an auxiliary rod 2, an iron wire 3 and an anchor nail 4; the precast block 1 comprises an outer pipe 101 and an inner pipe 102 which are concentrically arranged, wherein the diameter of the outer pipe 101 is consistent with the pile diameter of the CFG pile 5, and a concrete filling layer 103 is arranged between the outer pipe 101 and the inner pipe 102; the upper end of the auxiliary rod 2 is provided with a hollow pile pre-control length marking line 201; one end of the iron wire 3 is penetrated and arranged in the central hole of the inner tube 102 of the precast block 1 and is fixed, the other end of the iron wire 3 is fixedly connected with the anchor nail 4, and the anchor nail 4 is anchored on the ground.
The center hole diameter of the inner tube 102 is 75mm.
The thickness of the prefabricated section 1 is 0.25m.
The height of the auxiliary rod 2 is larger than the pre-control length of the hollow pile.
The height of the empty pile pre-control length marking line 201 from the bottom of the auxiliary rod 2 is 2.5m.
The outer tube 101 and the inner tube 102 are made of PVC tubes.
The concrete filling layer 103 uses C20 concrete.
The construction method of the height control device suitable for the reserved pile at the top of the CFG pile comprises the following specific steps:
s1, preparation:
s11, according to a construction drawing, manufacturing an outer pipe 101 with the diameter identical to the pile diameter of the CFG pile 5 by using a PVC pipe, manufacturing an inner pipe 102 by using a PVC pipe with the inner diameter of 75mm, placing plastic films on a prefabricated platform, placing the outer pipe 101 on the plastic films, centering the inner pipe 102 in the outer pipe 101 to form a concentric circle, pouring C20 concrete into a gap between the outer pipe 101 and the inner pipe 102 to form a concrete filling layer 103, and preparing the prefabricated block 1;
s12, in a woodworking area, cutting the bamboo poles into sections longer than the pre-control height of the empty piles, marking the mark lines 201 of the pre-control length of the empty piles at the position of the upper height of the bottom of the bamboo poles of 2.5m by using a marker pen, and obtaining auxiliary rods 2, wherein the number of the auxiliary rods 2 is 4-5;
s13, preparing the iron wire 3 and the anchor nails 4, and fully preparing for field installation;
s2, site construction:
s21, pile driver removing:
after the CFG pile 5 is poured with concrete to the actual pile top elevation, the pile machine continuously idles to the original ground elevation until the CFG pile 5 is removed;
s22, the prefabricated block 1 is lowered to a designated position:
the CFG pile 5 is poured with concrete to an excess pouring amount of 0.5-1m, the iron wire 3 is fixed after penetrating through the central hole of the precast block 1, the cylindrical precast block 1 with the iron wire 3 is extruded downwards from the pile hole by using the auxiliary rod 2, the round end surface of the precast block 1 faces downwards, and the empty pile pre-control length marking line 201 on the auxiliary rod 2 is consistent with the ground elevation;
s23, fixing the precast block 1 and pulling out the auxiliary rod 2:
and then the anchor nails 4 are fixed on the peripheral solid ground to prevent the precast block 1 from sinking along with the soil body, and after the anchor nails 4 are fixed, the auxiliary rod 2 can be pulled out, and the auxiliary rod 2 can be recycled.
In the construction process of the CFG pile 5, the operation proficiency of constructors, the underground water level condition and the like can influence the pile forming effect of the CFG pile 5, and the elevation of the pile top cannot be effectively controlled. Therefore, after the construction of the CFG pile 5 reaches the overfilling amount of 0.5-1m, the height control of the reserved empty pile at the top of the CFG pile 5 is realized by forming a simple control device by an embedded concrete precast block 1, an auxiliary rod 2 with a fixed length (longer than the pre-control height of the empty pile) and an iron wire 3 and an anchor nail 4 of an anchor soil body before the initial setting of the concrete.
The overall scheme is as follows: the iron wire 3 passes through a preformed hole in the center of the precast block 1, a mark line 201 of the pre-control length of the hollow pile is marked on a bamboo pole with a fixed length (longer than the pre-control height of the hollow pile), the precast concrete block 1 is extruded downwards through the bamboo pole with the fixed length, namely the auxiliary rod 2, when the bamboo pole is pressed down to a marked position, the precast block 1 reaches the elevation of the top of the hollow pile CFG pile 5, and the precast block 1 is fixed through the iron wire 3 and the anchor nail 4, so that the precast block stays at the fixed elevation, the actual pile top elevation can be effectively controlled, and the effect of compacting concrete in the pile is realized.
TABLE 1 comparison of the benefits of the present invention to conventional methods
On the premise of ensuring pile forming quality, the invention has the advantages of high installation speed, simple operation and lower construction difficulty, can be manufactured on site according to the sizes and the numbers of the diameters of the CFG piles 5, is simple to manufacture, meanwhile, the precast block 1 can be placed down to compact concrete, and after earthwork is excavated, the pile head is simply and conveniently broken, so that the installation efficiency is improved, and the construction quality is ensured to be consistent with the design intention.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is intended to cover various modifications, either made by the method concepts and technical solutions of the invention, or applied directly to other applications without modification, within the scope of the invention.
Claims (9)
1. The height control device suitable for the reserved pile at the top of the CFG pile is characterized by comprising a precast block (1), an auxiliary rod (2), a wire (3) and an anchor nail (4); the precast block (1) comprises an outer pipe (101) and an inner pipe (102) which are concentrically arranged, wherein the diameter of the outer pipe (101) is consistent with the pile diameter of the CFG pile (5), and a concrete filling layer (103) is arranged between the outer pipe (101) and the inner pipe (102); the upper end of the auxiliary rod (2) is provided with a hollow pile pre-control length marking line (201); one end of the iron wire (3) is penetrated in the central hole of the inner tube (102) of the precast block (1) and is fixed, the other end of the iron wire (3) is fixedly connected with the anchor nail (4), and the anchor nail (4) is anchored on the ground.
2. The height control device for CFG pile top prepared void pile according to claim 1, wherein the center hole diameter of the inner tube (102) is 75mm.
3. The height control device for CFG pile top reserved pile according to claim 2, wherein the thickness of the prefabricated block (1) is 0.25m.
4. A height control device for a CFG pile top reserved pile according to claim 3, characterized in that the height of the auxiliary rod (2) is greater than the pile reserved control length.
5. The height control device for the reserved pile at the top of the CFG pile according to claim 4, wherein the height of the reserved length mark line (201) of the reserved pile from the bottom of the auxiliary rod (2) is 2.5m.
6. The height control device for the reserved pile at the top of the CFG pile according to claim 5, wherein the outer tube (101) and the inner tube (102) are made of PVC tubes.
7. The height control device for CFG pile top reserved pile according to claim 6, wherein the concrete filling layer (103) uses C20 concrete.
8. The construction method of the height control device for the CFG pile top reserved pile according to claim 7, comprising the specific steps of:
s1, preparation:
s11, according to a construction drawing, manufacturing an outer pipe (101) with the diameter identical to the pile diameter of a CFG pile (5) by using a PVC pipe, manufacturing an inner pipe (102) by using a PVC pipe with the inner diameter of 75mm, placing a plastic film on a prefabricated platform, placing the outer pipe (101) on the plastic film, centering the inner pipe (102) in the outer pipe (101) to form a concentric circle shape, pouring C20 concrete into a gap between the outer pipe (101) and the inner pipe (102) to form a concrete filling layer (103), and preparing the prefabricated block (1);
s12, cutting the bamboo poles into sections longer than the pre-control height of the empty piles in a woodworking area, and marking an empty pile pre-control length marking line (201) at the upper ends of the sections of the bamboo poles to obtain auxiliary rods (2);
s13, preparing an iron wire (3) and an anchor nail (4), and fully preparing for field installation;
s2, site construction:
s21, pile driver removing:
after the CFG pile (5) is poured with concrete to the actual pile top elevation, the pile machine continuously idles to the original ground elevation until the CFG pile is removed;
s22, the prefabricated block (1) is lowered to a designated position:
the CFG pile (5) is poured with concrete to an excess pouring amount of 0.5-1m, an iron wire (3) is fixed after penetrating through a central hole of the precast block (1), the cylindrical precast block (1) with the iron wire (3) is extruded downwards to a pile hole by using an auxiliary rod (2), the round end face of the precast block (1) faces downwards, and an empty pile pre-control length marking line (201) on the auxiliary rod (2) is consistent with the ground elevation;
s23, fixing the precast block (1) and pulling out the auxiliary rod (2):
and then the anchor nails (4) are fixed on the peripheral solid ground to prevent the precast block (1) from sinking along with the soil body, and after the anchor nails (4) are fixed, the auxiliary rod (2) can be pulled out, and the auxiliary rod (2) can be recycled.
9. The construction method of the height control device for the reserved piles on the top of the CFG pile according to claim 8, wherein in the step S12, the marker pen is used to mark the reserved pile control length marking line (201) at the position where the upward height of the bottom of the bamboo pole is 2.5m, and the number of the auxiliary rods (2) is 4-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311621013.6A CN117626963A (en) | 2023-11-30 | 2023-11-30 | Height control device suitable for CFG pile top reserved pile and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311621013.6A CN117626963A (en) | 2023-11-30 | 2023-11-30 | Height control device suitable for CFG pile top reserved pile and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117626963A true CN117626963A (en) | 2024-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311621013.6A Pending CN117626963A (en) | 2023-11-30 | 2023-11-30 | Height control device suitable for CFG pile top reserved pile and construction method |
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| Country | Link |
|---|---|
| CN (1) | CN117626963A (en) |
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2023
- 2023-11-30 CN CN202311621013.6A patent/CN117626963A/en active Pending
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