CN114753355A - Construction method for pile foundation of thick and soft soil layer - Google Patents
Construction method for pile foundation of thick and soft soil layer Download PDFInfo
- Publication number
- CN114753355A CN114753355A CN202210524127.8A CN202210524127A CN114753355A CN 114753355 A CN114753355 A CN 114753355A CN 202210524127 A CN202210524127 A CN 202210524127A CN 114753355 A CN114753355 A CN 114753355A
- Authority
- CN
- China
- Prior art keywords
- casing
- cylinder
- double
- hole
- wall
- 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.)
- Pending
Links
- 238000010276 construction Methods 0.000 title claims abstract description 56
- 239000002689 soil Substances 0.000 title claims abstract description 34
- 230000001681 protective effect Effects 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 49
- 239000010959 steel Substances 0.000 claims description 49
- 238000003466 welding Methods 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 11
- 235000017491 Bambusa tulda Nutrition 0.000 description 11
- 241001330002 Bambuseae Species 0.000 description 11
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 11
- 239000011425 bamboo Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 241001080929 Zeugopterus punctatus Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 208000001613 Gambling Diseases 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
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
- E02D5/34—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
-
- 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
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
Abstract
The application discloses a thick and soft soil layer pile foundation construction method, and relates to the technical field of pile foundation construction. The method comprises the following steps: processing an inner protective cylinder; processing an outer casing on the outer ring of the inner casing to form a double-wall casing, wherein the thickness of the inner casing is greater than that of the outer casing; drilling a hole in the ground surface to a preset depth to form a pile hole; hoisting the double-wall casing and extending into the pile hole; pulling out the inner protective cylinder; and pouring concrete into the outer casing to form a pile foundation. The construction cost can be reduced, and the construction quality and the construction safety can be improved.
Description
Technical Field
The application relates to the technical field of pile foundation construction, in particular to a thick and soft soil layer pile foundation construction method.
Background
In the construction process of the highway, soft soil layers such as silt and silt layers with the thickness of 30-50 m are frequently encountered, and the problems of hole collapse, hole expansion and necking and the like are the most easily caused when the bridge pile foundation construction is carried out under the working condition environment. The traditional slurry wall protection effect is poor, the only effective method for construction units is to lengthen the steel casing, but the steel casing is only lengthened to pass through 2/3 thick soft soil layers, and in order to facilitate the steel casing to be driven into a soil layer which is not deformed and can bear strong soil pressure, the steel casing needs to be rolled by steel plates with the wall thickness of more than 22mm so as to ensure the required strength requirement.
The fact that the pile forming rate is found to be obviously improved during construction, but the 1/3 bottom weak soil layer without pile casing still is a centralized position of quality problem shows that the steel pile casing penetrating through the soft soil layer is really the best method, but the steel quantity is large by adopting the mode, and the investment increases the engineering cost to reach billions of yuan.
Due to the fact that the form of the steel casing is too high in cost, during actual construction, a certain construction team can take the risk of adopting the slurry wall protection and improving slurry gambling gas and is reluctant to adopt the form of the steel casing, and the problems of pile foundation quality and construction safety are increased rapidly.
Disclosure of Invention
The application aims to provide a thick and soft soil layer pile foundation construction method, which can reduce construction cost and improve construction quality and safety during construction.
The embodiment of the application is realized as follows:
the embodiment of the application provides a thick and soft soil layer pile foundation construction method, which comprises the following steps:
processing an inner protective cylinder; processing an outer casing on the outer ring of the inner casing to form a double-wall casing, wherein the thickness of the inner casing is greater than that of the outer casing; drilling a hole in the ground surface to a preset depth to form a pile hole; hoisting the double-wall casing and extending into the pile hole; pulling out the inner protective cylinder; and pouring concrete into the outer casing to form a pile foundation.
Optionally, the inner protecting tube comprises an inner tube top section, an inner tube standard section and an inner tube bottom section, and the processing inner protecting tube comprises:
respectively processing the inner cylinder top section, the inner cylinder standard section and the inner cylinder bottom section; and sequentially connecting the inner cylinder top section, at least one inner cylinder standard section and the inner cylinder bottom section.
Optionally, the inner cylinder top section comprises a first inner cylinder, an outer ring at one end of the first inner cylinder is provided with a reinforcing hoop, and an inner ring at the other end of the first inner cylinder is provided with a first inner sleeve; the inner cylinder standard knot comprises a second inner cylinder and a second inner sleeve arranged at the inner ring at one end of the second inner cylinder; the two ends of the first inner cylinder are respectively provided with a first connecting hole, the two ends of the second inner cylinder are respectively provided with a second connecting hole, and the bottom section of the inner cylinder comprises a third inner cylinder and a third connecting hole arranged at one end of the third inner cylinder; will inner tube top festival, at least one the inner tube standard festival with the inner tube bottom festival connects gradually and includes:
connecting the first inner sleeve with one end of the second inner sleeve, which is far away from the second inner sleeve; connecting the third inner barrel with the second inner sleeve.
Optionally, the outer casing comprises an outer cylinder top section, an outer cylinder standard section and an outer cylinder bottom section; the processing of the outer casing at the inner casing outer ring to form a double-wall casing comprises:
respectively winding a first steel plate, a second steel plate and a third steel plate on the outer ring of the inner casing; welding the two opposite sides of the butted first steel plates to form the outer cylinder top section; welding the two opposite sides of the second steel plate after being butted to form the outer cylinder standard knot; welding the two opposite sides of the butted third steel plates to form the outer cylinder bottom section; sequentially welding the outer cylinder top section, the outer cylinder standard section and the outer cylinder bottom section to form the outer protective cylinder; and a check ring is arranged on the inner ring at one end of the outer cylinder bottom section, so that one end of the inner protective cylinder is abutted against the check ring.
Optionally, the preset depth is equal to the length of the double-wall casing; the hoisting of the double-wall casing and the extending into the pile hole comprises the following steps:
and enabling the double-wall casing to extend out of the ground surface for a preset distance and fixing.
Optionally, when the preset depth is greater than the length of the double-wall casing, a first buckle and a second buckle are respectively arranged at two opposite ends of the inner casing, and a first buckle and a second buckle are respectively arranged at two opposite ends of the outer casing; the hoisting of the double-wall casing and the extending into the pile hole comprises the following steps:
drilling a hole in the ground surface until the depth of the pile hole is equal to the length of the double-wall casing; extending the double-walled casing into the pile hole; continuously punching the preset depth to enable the double-wall casing to sink by means of self gravity; and extending the other double-wall casing into the pile hole, and correspondingly clamping the butted inner casing and the butted outer casing through the first buckle and the second buckle respectively.
Optionally, when the preset depth is equal to the length of the double-wall casing, the extracting the inner casing comprises:
injecting water or slurry into the double-wall casing; and vibrating the inner protecting cylinder by using a vibrator wall hanging, and gradually applying force to the inner protecting cylinder to accelerate the lifting.
Optionally, the pouring concrete into the outer casing comprises:
hoisting a steel bar framework into the outer protective cylinder; and injecting the concrete into the bottom of the outer protective cylinder through a guide pipe, and gradually lifting upwards.
Optionally, when the preset depth is greater than the length of the double-wall casing, the extracting the inner casing comprises:
when the pulling length of the inner protection cylinder is equal to the length of the double-wall protection cylinder, fixing the inner protection cylinder, and removing and hanging the pulled inner protection cylinder; and connecting and pulling out the next inner protective cylinder by using a lifting appliance.
Optionally, the thickness of the inner casing is 3mm to 5mm, and the thickness of the outer casing is 2mm to 3 mm.
The beneficial effects of the embodiment of the application include:
according to the thick and soft soil layer pile foundation construction method, the inner protective cylinder and the outer protective cylinder are arranged respectively, and the outer ring of the inner protective cylinder is arranged to form the double-wall protective cylinder, so that the overall structural strength is enhanced, and shrinkage and collapse caused by soil pressure failure are avoided. Wherein, the processing of a double-walled protects a section of thick bamboo and the construction in stake hole can go on simultaneously to guarantee the efficiency of construction, after the stake hole construction is accomplished, can hoist a double-walled protects a section of thick bamboo, and stretch into to the stake downthehole, in order to guarantee the construction quality in stake hole, avoid not stretching into a double-walled protects a section of thick bamboo to the stake downthehole for a long time, cause collapsing of stake hole. When concrete is poured into the pile hole, the inner protective cylinder needs to be pulled out, so that the inner protective cylinder can be recycled, the outer protective cylinder is left in the pile hole, and the stability of the state of the pile hole is guaranteed. After the inner pile casing is pulled out, concrete can be poured into the outer pile casing to form the required pile foundation. By adopting the form, the outer protective sleeve staying in the soil body is only 1/6-1/8 of the material dosage (thickness) of the original designed protective sleeve, so that the consumption of steel is less than 20% of the original cost, the construction cost can be reduced, and the construction quality and the construction safety can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic flow chart of a soft and weak thick soil layer pile foundation construction method provided by an embodiment of the application;
fig. 2 is a schematic structural diagram of an inner casing according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an outer casing according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an outer barrel bottom section provided in the embodiment of the present application.
Icon: 100-an inner protective cylinder; 110-inner cylinder top section; 112-a first inner barrel; 114-a reinforcing hoop; 116-a first inner sleeve; 118-a first connection aperture; 120-inner cylinder standard section; 122-a second inner barrel; 124-a second inner sleeve; 126-second connection hole; 130-inner cylinder bottom section; 132-a third inner barrel; 134-third connection hole; 200-outer protective cylinder; 210-outer cylinder top section; 212-a first steel plate; 214-a stiffening hoop; 220-outer cylinder standard joint; 222-a second steel plate; 230-outer barrel bottom section; 232-a third steel plate; 234-a retaining ring; 236-steel reinforcement.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, fig. 2 and fig. 3, the present embodiment provides a method for constructing a thick and weak soil layer pile foundation, including:
s100, processing the inner protective sleeve 100.
S200, processing the outer casing 200 on the outer ring of the inner casing 100 to form a double-wall casing, wherein the thickness of the inner casing 100 is larger than that of the outer casing 200.
And S300, drilling the ground surface to a preset depth to form a pile hole.
S400, hoisting the double-wall casing and extending into the pile hole.
S500, the inner protection barrel 100 is pulled out.
And S600, pouring concrete into the outer casing 200 to form a pile foundation.
Specifically, the inner casing 100 may be processed at a construction site, or may be preliminarily processed at a factory and then transported to the construction site for final processing. The cost and time are saved, and the method can be flexibly selected according to the actual working environment. After the inner casing 100 is processed, the outer casing 200 is processed on the outer ring of the inner casing 100 to form the double-wall casing, and by adopting the mode, when the double-wall casing is stretched into a pile hole, the required structural strength can be ensured, and shrinkage and collapse caused by the fact that soil pressure cannot be resisted are avoided. In the subsequent construction process, the inner casing 100 needs to be pulled out, so that the outer casing 200 is processed on the outer ring of the inner casing 100, and the inner casing 100 and the outer casing are not clamped. Meanwhile, after the inner pile casing 100 is pulled out, the outer pile casing 200 needs to be left in the pile hole, and the thickness of the inner pile casing 100 is set to be larger than that of the outer pile casing 200, so that the steel left in the pile hole is ensured to be less, and the construction cost is reduced.
According to the construction method of the thick and soft soil layer pile foundation provided by the embodiment of the application, the inner pile casing 100 and the outer pile casing 200 are respectively arranged, and the outer pile casing 200 is arranged on the outer ring of the inner pile casing 100 to form the double-wall pile casing, so that the integral structural strength is favorably enhanced, and shrinkage and collapse caused by the fact that soil pressure cannot be resisted are avoided. Wherein, the processing of a double-walled casing and the construction in stake hole can be gone on simultaneously to guarantee the efficiency of construction, accomplish the back at stake hole construction, can hoist a double-walled casing, and stretch into to the stake downthehole, in order to guarantee the construction quality in stake hole, avoid not stretching into a double-walled casing to the stake downthehole for a long time, cause collapsing of stake hole. When concrete needs to be poured into the pile hole, the inner protective sleeve 100 needs to be pulled out so as to recycle the inner protective sleeve 100, and the outer protective sleeve 200 is left in the pile hole to ensure the stability of the state of the pile hole. After the inner casing 100 is pulled out, concrete can be poured into the outer casing 200 to form a desired pile foundation. By adopting the form, the outer casing 200 residing in the soil body is only 1/6-1/8 of the material dosage (thickness) of the originally designed casing, so that the consumption of steel is less than 20% of the original cost, the construction cost can be reduced, and the construction quality and the construction safety can be improved.
As shown in FIG. 2, inner barrel 100 includes an inner barrel top section 110, an inner barrel standard section 120, and an inner barrel bottom section 130; the step of processing the inner casing 100 includes:
s110, respectively processing an inner cylinder top section 110, an inner cylinder standard section 120 and an inner cylinder bottom section 130.
S120, sequentially connecting the inner cylinder top section 110, the at least one inner cylinder standard section 120 and the inner cylinder bottom section 130.
Specifically, the overall length of the inner casing 100 can reach about 15m, and for convenience of construction, the inner casing 100 is disassembled into an inner cylinder top section 110, an inner cylinder standard section 120 and an inner cylinder bottom section 130, and then assembled when needed. When the double-walled casing is inserted into the pile hole, the inner casing 100 may be arranged in series so as to match the depth of the pile hole. In addition, in the actual construction process, the depth of the actual pile hole is not an integral multiple of the length of the inner casing 100, and in the actual construction process, the two inner cylinder standard knots 120 can be serially arranged between the inner cylinder top knot 110 and the inner cylinder bottom knot 130, or the inner cylinder top knot 110 and the inner cylinder bottom knot 130 can be directly connected according to the actual situation, so as to be better matched with the depth of the pile hole.
With continued reference to fig. 2, the inner cylinder top section 110 includes a first inner cylinder 112, an outer ring of one end of the first inner cylinder 112 is provided with a reinforcing hoop 114, and an inner ring of the other end of the first inner cylinder 112 is provided with a first inner sleeve 116; the inner cylinder standard joint 120 comprises a second inner cylinder 122 and a second inner sleeve 124 arranged at the inner ring at one end of the second inner cylinder 122; the two ends of the first inner cylinder 112 are respectively provided with a first connection hole 118, the two ends of the second inner cylinder 122 are respectively provided with a second connection hole 126, and the inner cylinder bottom section 130 comprises a third inner cylinder 132 and a third connection hole 134 arranged at one end of the third inner cylinder 132; the step of connecting the inner barrel top section 110, the at least one inner barrel standard section 120 and the inner barrel bottom section 130 in sequence comprises:
s122, connecting the first inner sleeve 116 with one end of the second inner sleeve 122 far away from the second inner sleeve 124;
and S124, connecting the third inner sleeve 132 with the second inner sleeve 124.
Specifically, strengthening the hoop 114 through the outer lane setting at first inner tube 112 one end is favorable to guaranteeing the structural strength at first inner tube 112 border, avoids first inner tube 112 to take place to warp, sets up first connecting hole 118 through the one end of strengthening the hoop 114 in the setting, and first connecting hole 118 runs through first inner tube 112 simultaneously and strengthens the hoop 114, and the number of first connecting hole 118 can set up to a plurality ofly, and the hoist of being convenient for hoists the operation through first connecting hole 118. In addition, a first connection hole 118 formed at an end of the first inner tube 112 away from the reinforcing collar 114 is disposed on the first inner tube 116, and a second connection hole 126 formed at an end of the second inner tube 122 is correspondingly disposed when the first inner tube 116 and an end of the second inner tube 122 away from the second inner tube 124 are connected, so that a fastener such as a bolt can pass through the first connection hole 118 of the first inner tube 116 and pass through the second inner tube 122 through the second connection hole 126, thereby forming a desired connection relationship between the first inner tube 112 and the second inner tube 122. Similar to the method described above, when the second inner barrel 122 is coupled to the second inner barrel 124, the fastener is inserted through the second coupling hole 126 of the second inner barrel 124 to form a desired coupling relationship with the third coupling hole 134 at the end of the third inner barrel 132. Thus, the inner shroud 100 can be formed by sequentially connecting the inner barrel top section 110, the at least one inner barrel standard section 120, and the inner barrel bottom section 130.
As shown in fig. 1 and 3, when the outer casing 200 includes an outer cylinder top section 210, an outer cylinder standard section 220 and an outer cylinder bottom section 230; the step of processing the outer casing 200 at the outer ring of the inner casing 100 to form a double-wall casing includes:
s210, the first steel plate 212, the second steel plate 222, and the third steel plate 232 are wound around the outer ring of the inner casing 100.
And S220, welding the two opposite sides of the butted first steel plates 212 to form the outer cylinder top section 210.
And S230, welding the two opposite sides of the second steel plate 222 after butt joint to form the outer cylinder standard joint 220.
And S240, welding the opposite two sides of the butted third steel plates 232 to form the outer cylinder bottom section 230.
And S250, sequentially welding the outer cylinder top joint 210, the outer cylinder standard joint 220 and the outer cylinder bottom joint 230 to form the outer protective cylinder 200.
And S260, arranging a retaining ring 234 on the inner ring at one end of the outer cylinder bottom section 230 so that one end of the inner cylinder 100 is abutted against the retaining ring 234.
Specifically, in order to save cost, the inner casing 100 may be used as a core for paving and welding in a construction site, but the circumference should be accurately calculated and the steel plate should be cut to ensure the required matching precision. In the winding process, because the welding opening is difficult to close around the inner casing 100, the steel wire rope can be wound for a plurality of circles, and then the steel plate is beaten by a wooden hammer while the steel wire rope is tightened until the butt joint is convenient to weld. When the outer cylinder top section 210 is formed by welding, a stiffening hoop 214 is welded at one end of the outer cylinder top section 210 so as to ensure the strength during hoisting and avoid deformation caused by hoisting. In addition, the inner ring at one end of the outer cylinder bottom section 230 is provided with the retaining ring 234, so that one end of the inner casing 100 abuts against the retaining ring 234, and thus, when the double-wall casing is placed into the pile hole, the stability of the relative positions of the inner casing 100 and the outer casing 200 is favorably ensured, and the dislocation is avoided. It can be understood that, in order to avoid the jamming between the inner casing 100 and the outer casing 200 and prevent the inner casing 100 from being smoothly pulled out, a gap of 1mm to 2mm may be formed between the inner casing 100 and the outer casing 200, so that the inner casing 100 can be forced to slide relative to the outer casing 200 while the inner casing 100 supports the outer casing 200 to a certain extent.
In an alternative embodiment of the present application, the predetermined depth is equal to the length of the double-walled casing; the step of hoisting the double-wall casing into the pile hole comprises the following steps:
the double-wall casing is fixed and extends out of the ground surface for a preset distance.
Specifically, when the earth's surface punches to the preset depth, can adopt and dig the direct normal position of brill soon and punch to the double-walled and protect a section of thick bamboo bottom position, carry the quick-witted double-walled that bores the back and hang the section of thick bamboo that will overlap and put well the manhole well, have the top of bobbing hammer condition to add the appropriate amount vibrations of bobbing hammer and accelerate the manhole, the electronic attached electromagnetic shaker of peripheral symmetry hook of no bobbing hammer assists. After the manhole is finished, the double-wall pile casing is made to stretch out of the earth surface for a preset distance and is fixed, by adopting the form, the situation that the earth surface soil layer is too soft and influences subsequent construction can be avoided, and the concrete protective cap is convenient to be arranged around the pile hole so as to guarantee the construction quality.
In an alternative embodiment of the present application, when the preset depth is greater than the length of the double-wall casing, the opposite ends of the inner casing 100 are respectively provided with a first buckle and a second buckle, and the opposite ends of the outer casing 200 are also respectively provided with a first buckle and a second buckle; the step of hoisting the double-wall casing into the pile hole comprises the following steps:
and S410, drilling a hole on the ground surface until the depth of the pile hole is equal to the length of the double-wall casing.
And S420, extending the double-wall casing into the pile hole.
And S430, continuously punching for a preset depth so that the double-wall casing sinks by means of self gravity.
And S440, extending the other double-wall pile casing into the pile hole, and correspondingly clamping the butted inner casing 100 and outer casing 200 through a first buckle and a second buckle respectively.
Specifically, when the preset depth is larger than the length of the double-wall pile casing, the hole cannot be punched to the preset depth at one time, so that hole shrinkage and hole collapse are easily caused, and normal construction of subsequent processes is influenced. Through after the earth's surface punches to the length of a double-walled protects a section of thick bamboo, stretch into a double-walled protects a section of thick bamboo to stake hole, this moment, when continuing to punch again, the both arms that have been located in the stake hole protect a section of thick bamboo and can rely on self gravity to sink, when punching to the length of another double-walled protects a section of thick bamboo, stretch into a double-walled protects a section of thick bamboo with another double-walled, this moment, rotatory back one stretches into a double-walled protects a section of thick bamboo to the stake hole in to make interior protective cylinder 100 and outer protective cylinder 200 correspond the joint through first buckle and second buckle respectively, thereby form required relation of connection. By adopting the mode, after the hole is drilled and connected in a section, a double-wall pile casing is connected until the thick and soft soil layer is penetrated.
In an alternative embodiment of the present application, where the predetermined depth is equal to the length of the double-walled casing, the step of extracting the inner casing 100 comprises:
and S510, injecting water or slurry into the double-wall casing.
S520, vibrating the inner casing 100 by using a vibrator to hang on the wall, and gradually applying force to the inner casing 100 to accelerate the lifting.
Specifically, in order to avoid that the required structural strength cannot be achieved only by the outer casing 200 after the inner casing 100 is pulled out, water or slurry can be injected into the double-wall casing, so that when the inner casing 100 is pulled out, the outer casing 200 is filled with water or slurry, so that the internal pressure and the external pressure of the outer casing 200 tend to be balanced, and the stability of the inner casing 100 after being pulled out is ensured. In the operation of pulling out the inner casing 100, the inner casing 100 is vibrated by the wall hanging of the vibrator, which is beneficial to reducing the resistance when the inner casing 100 is pulled out, and when the inner casing 100 can move smoothly relative to the outer casing 200, the inner casing 100 can be gradually forced to be accelerated to lift, thereby improving the operation efficiency.
As shown in fig. 4, a plurality of steel bars 236 are welded to the outer ring of the outer cylinder bottom section 230 formed by winding the third steel plate 232, one end of each steel bar 236 is welded to the outer cylinder bottom section 230, and each steel bar 236 and the outer cylinder bottom section 230 form a certain angle, after the double-wall casing extends into the pile hole, the inner casing 100 is pulled out, the inner casing 100 also applies an acting force for pulling out the outer casing 200, and by arranging the steel bars 236, the barb is formed at the outer cylinder bottom section 230, so that the outer casing 200 is prevented from being pulled out along with the inner casing 100.
Optionally, when the preset depth is greater than the length of the double-wall casing, the step of pulling out the inner casing 100 further comprises:
s530, when the pulled-out length of the inner protecting cylinder 100 is equal to the length of the double-wall protecting cylinder, the inner protecting cylinder 100 is fixed, and the pulled-out inner protecting cylinder 100 is detached and lifted away.
And S540, connecting and pulling out the next inner casing 100 by using a lifting appliance.
Specifically, when a plurality of double-wall casing pipes are arranged in a pile hole, the construction form of the lifting appliance is limited, all the inner casing pipes 100 cannot be pulled out at one time, when one section of the inner casing pipe 100 is pulled out, the next inner casing pipe 100 is temporarily clamped by a well-shaped support, the connection of the butt joint is removed, the previous section is lifted away, and then the next section is fixed by the lifting appliance and continuously lifted until all the inner casing pipes 100 are pulled out of the hole.
In an alternative embodiment of the present application, the step of pouring concrete into the outer casing 200 comprises:
s610, hoisting a steel bar 236 framework into the outer protective sleeve 200;
and S620, injecting concrete into the bottom of the outer casing 200 through a guide pipe, and gradually lifting the concrete upwards.
Specifically, in order to ensure the quality of the pile foundation, before concrete is poured, the steel reinforcement 236 framework needs to be hung into the outer casing 200, the concrete is injected into the bottom of the outer casing 200 through the guide pipe and gradually lifted upwards, so that water or slurry in the outer casing 200 is discharged out of the outer casing 200 and is completely filled with the concrete, and thus the required pile foundation is generated. After the inner casing 100 is pulled out, in order to avoid the outer casing 200 being too soft to resist a large pressure on the ground surface, a 50cm × 20cm concrete cap ring can be poured after 0.5 m of the ground surface is replaced, so as to ensure the stability of the surface of the pile hole.
In an alternative embodiment of the present application, the inner sheath 100 has a thickness of 3mm to 5mm and the outer sheath 200 has a thickness of 2mm to 3 mm. Therefore, the consumption of steel can be reduced under the condition of ensuring the structural strength of the formed double-wall casing, and the construction cost is favorably reduced.
By adopting the form, the method has good popularization value and economic benefit, has good popularization and reference significance for reinforcing soft soil layer foundations, such as steel pipe concrete piles, and also has reference significance and economic value for deep water pile foundation drilling.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A thick and soft soil layer pile foundation construction method is characterized by comprising the following steps:
processing an inner protective cylinder;
processing an outer casing on the outer ring of the inner casing to form a double-wall casing, wherein the thickness of the inner casing is greater than that of the outer casing;
drilling a hole in the ground surface to a preset depth to form a pile hole;
hoisting the double-wall casing and extending into the pile hole;
pulling out the inner protective cylinder;
and pouring concrete into the outer casing to form a pile foundation.
2. The thick and soft soil layer pile foundation construction method according to claim 1, wherein the inner casing comprises an inner cylinder top section, an inner cylinder standard section and an inner cylinder bottom section, and the processing of the inner casing comprises:
respectively processing the inner cylinder top section, the inner cylinder standard section and the inner cylinder bottom section;
and sequentially connecting the inner cylinder top section, at least one inner cylinder standard section and the inner cylinder bottom section.
3. The thick and soft soil layer pile foundation construction method according to claim 2, wherein the inner cylinder top section comprises a first inner cylinder, an outer ring of one end of the first inner cylinder is provided with a reinforcing hoop, and an inner ring of the other end of the first inner cylinder is provided with a first inner sleeve; the inner cylinder standard knot comprises a second inner cylinder and a second inner sleeve arranged at the inner ring at one end of the second inner cylinder; the two ends of the first inner cylinder are respectively provided with a first connecting hole, the two ends of the second inner cylinder are respectively provided with a second connecting hole, and the bottom section of the inner cylinder comprises a third inner cylinder and a third connecting hole arranged at one end of the third inner cylinder;
will inner tube top festival, at least one the inner tube standard festival with the inner tube bottom festival connects gradually and includes:
connecting the first inner sleeve with one end of the second inner sleeve, which is far away from the second inner sleeve;
connecting the third inner barrel with the second inner sleeve.
4. The thick and soft soil layer pile foundation construction method according to claim 1, wherein the outer casing comprises an outer cylinder top section, an outer cylinder standard section and an outer cylinder bottom section;
the processing of the outer casing at the inner casing outer ring to form a double-wall casing comprises:
respectively winding a first steel plate, a second steel plate and a third steel plate on the outer ring of the inner casing;
welding the two opposite sides of the butted first steel plates to form the outer cylinder top section;
welding the two opposite sides of the second steel plate after being butted to form the outer cylinder standard knot;
welding the two opposite sides of the butted third steel plates to form the outer cylinder bottom section;
sequentially welding the outer cylinder top section, the outer cylinder standard section and the outer cylinder bottom section to form the outer protective cylinder;
and a check ring is arranged on the inner ring at one end of the outer cylinder bottom section, so that one end of the inner protective cylinder is abutted against the check ring.
5. The method of constructing a pile foundation for a thick and soft soil layer according to claim 1, wherein the predetermined depth is equal to the length of the double-wall casing;
the hoisting of the double-wall casing and the extending into the pile hole comprises the following steps:
and enabling the double-wall casing to extend out of the ground surface for a preset distance and fixing.
6. The thick and soft soil layer pile foundation construction method according to claim 1, wherein when the preset depth is greater than the length of the double-wall casing, a first buckle and a second buckle are respectively arranged at two opposite ends of the inner casing, and a first buckle and a second buckle are respectively arranged at two opposite ends of the outer casing;
the hoisting of the double-wall casing and the extending into the pile hole comprises the following steps:
drilling a hole on the ground surface until the depth of the pile hole is equal to the length of the double-wall casing;
extending the double-walled casing into the pile hole;
continuously punching the preset depth to enable the double-wall casing to sink by means of self gravity;
and extending the other double-wall casing into the pile hole, and correspondingly clamping the butted inner casing and the butted outer casing through the first buckle and the second buckle respectively.
7. The method for constructing a thick and soft soil layer pile foundation according to claim 1, wherein the pulling out the inner casing comprises:
injecting water or slurry into the double-wall casing;
and vibrating the inner protecting cylinder by using a vibrator wall hanging, and gradually applying force to the inner protecting cylinder to accelerate the lifting.
8. The method for constructing a pile foundation of a thick and soft soil layer according to claim 1, wherein the step of pouring concrete into the outer casing comprises the steps of:
hoisting a steel bar framework into the outer protective cylinder;
and injecting the concrete into the bottom of the outer protective cylinder through a guide pipe, and gradually lifting upwards.
9. The method for constructing a pile foundation for a thick and soft soil layer according to claim 6, wherein the extracting the inner casing comprises:
when the pulling length of the inner protection cylinder is equal to the length of the double-wall protection cylinder, fixing the inner protection cylinder, and removing and hanging the pulled inner protection cylinder;
and connecting and pulling out the next inner protective cylinder by using a lifting appliance.
10. The method for constructing a pile foundation in a thick and soft soil layer according to any one of claims 1 to 9, wherein the thickness of the inner casing is 3mm to 5mm, and the thickness of the outer casing is 2mm to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210524127.8A CN114753355A (en) | 2022-05-13 | 2022-05-13 | Construction method for pile foundation of thick and soft soil layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210524127.8A CN114753355A (en) | 2022-05-13 | 2022-05-13 | Construction method for pile foundation of thick and soft soil layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114753355A true CN114753355A (en) | 2022-07-15 |
Family
ID=82334239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210524127.8A Pending CN114753355A (en) | 2022-05-13 | 2022-05-13 | Construction method for pile foundation of thick and soft soil layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114753355A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015158169A1 (en) * | 2014-04-15 | 2015-10-22 | 谢庆道 | Construction process of pipe pile and dedicated boring device thereof |
| CN106284314A (en) * | 2016-08-31 | 2017-01-04 | 中冶建工集团有限公司 | Karst landform spiral-digging pore cast-in-place pile construction method |
| CN108842802A (en) * | 2018-09-10 | 2018-11-20 | 山东省路桥集团有限公司 | Piles in Karst Region base construction method |
| CN213390115U (en) * | 2020-09-04 | 2021-06-08 | 中铁十九局集团广州工程有限公司 | Steel protects a sub-assembly |
| CN113309080A (en) * | 2021-04-19 | 2021-08-27 | 中铁十九局集团第三工程有限公司 | Construction method of double-casing cast-in-situ bored pile |
| CN113404045A (en) * | 2021-06-30 | 2021-09-17 | 中建科工集团有限公司 | Pile foundation construction method |
-
2022
- 2022-05-13 CN CN202210524127.8A patent/CN114753355A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015158169A1 (en) * | 2014-04-15 | 2015-10-22 | 谢庆道 | Construction process of pipe pile and dedicated boring device thereof |
| CN106284314A (en) * | 2016-08-31 | 2017-01-04 | 中冶建工集团有限公司 | Karst landform spiral-digging pore cast-in-place pile construction method |
| CN108842802A (en) * | 2018-09-10 | 2018-11-20 | 山东省路桥集团有限公司 | Piles in Karst Region base construction method |
| CN213390115U (en) * | 2020-09-04 | 2021-06-08 | 中铁十九局集团广州工程有限公司 | Steel protects a sub-assembly |
| CN113309080A (en) * | 2021-04-19 | 2021-08-27 | 中铁十九局集团第三工程有限公司 | Construction method of double-casing cast-in-situ bored pile |
| CN113404045A (en) * | 2021-06-30 | 2021-09-17 | 中建科工集团有限公司 | Pile foundation construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108643192A (en) | Brace in Deep Footing Groove supporting ultralong steel tube column pile construction method | |
| CN102359110A (en) | Modular cast-in-place construction method for large-diameter root foundation | |
| CN108612111A (en) | A kind of construction method of steel-pipe pile and foundation pit enclosure structure and foundation pit enclosure structure | |
| JP3689840B2 (en) | Seismic reinforcement method for existing structure foundation | |
| CN109898669B (en) | Construction method for underground first-layer beam column joint by reverse construction method | |
| CN108589709B (en) | Hollow friction pile without stirrups and construction method thereof | |
| CN114753355A (en) | Construction method for pile foundation of thick and soft soil layer | |
| KR101893658B1 (en) | Apparatus for a mold for joint part between case in place uper end of pile and rear bridge for monopile construnction | |
| JP5192346B2 (en) | Pile head processing method | |
| JP2005146577A (en) | Reinforcing cage for foundation pile, and method of reinforcement arrangement for enlarging enlarged bottom part | |
| CN110387872B (en) | Multilayer wailing steel sheet pile construction method | |
| CN115787642A (en) | Construction method suitable for drilling covering layer easy to collapse | |
| CN212506251U (en) | Reusable steel casing | |
| CN111733805A (en) | Underwater core mould system for cast-in-situ large-diameter hollow pipe column foundation | |
| CN112112167A (en) | Height-limited section foundation pit supporting structure and construction method thereof | |
| CN2661770Y (en) | Behind inserting reinforcing cage for long screw pore-forming guncreting piling and conveying device therefor | |
| JP3827309B2 (en) | Auxiliary pile method and embedded pile method | |
| CN213926331U (en) | Sump pit supporting template | |
| JP4137172B1 (en) | Reinforcing bar construction in cast-in-place pile | |
| CN220133911U (en) | Sleeve of underwater slurry lifting reinforced drill rod for wharf foundation | |
| CN219568848U (en) | Precast pile with pile cap | |
| CN212052723U (en) | Building foundation filling pile for civil engineering | |
| CN218540686U (en) | But adjustable cyclic utilization's simple and easy pile foundation steel reinforcement cage drill way positioner | |
| CN212801510U (en) | Underwater core mould system for cast-in-situ large-diameter hollow pipe column foundation | |
| CN215442048U (en) | Foundation pit monitoring point protection device |
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 |