CN115404849B - Pile casing for filling pile penetrating through underground waste hollow building structure and construction method - Google Patents
Pile casing for filling pile penetrating through underground waste hollow building structure and construction method Download PDFInfo
- Publication number
- CN115404849B CN115404849B CN202211063206.XA CN202211063206A CN115404849B CN 115404849 B CN115404849 B CN 115404849B CN 202211063206 A CN202211063206 A CN 202211063206A CN 115404849 B CN115404849 B CN 115404849B
- Authority
- CN
- China
- Prior art keywords
- hollow building
- pile
- building structure
- underground waste
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The application discloses a bored concrete pile passes through a pile casing of old and useless hollow building structure in underground, it includes the barrel, and the one end of barrel is equipped with a plurality of slide holes that distribute along the circumference, and every slide hole all slides and runs through there is the bracing piece, is equipped with the toper post in the barrel, toper post swing joint barrel, and the diameter of toper post from top to bottom grow gradually, and the one end in the barrel is located to the bracing piece is connected in the toper post, and the toper post is connected with the stay cord, and the stay cord is worn out from the one end that the bracing piece was kept away from to the barrel. The method has the effect of reducing the cost of the pile casing of the filling pile penetrating through the underground waste hollow building structure.
Description
Technical Field
The invention relates to the field of cast-in-place piles, in particular to a pile casing for a cast-in-place pile penetrating through an underground waste hollow building structure and a construction method.
Background
Along with the occurrence of new urban old modification projects, the situation that the bored concrete pile meets underground waste hollow building structures such as waste municipal pipelines, air-raid shelters, basement and the like is also increasing. Under the geological condition of a water-rich thick sand layer, the waste hollow building structure buried underground inevitably brings great difficulty to the construction of the bored pile, if the waste hollow building structure is not treated, a large amount of concrete is lost, the pile is difficult to form, and the quality and the cost of the bored pile are seriously influenced. Because the underground waste hollow building structure has large space and is difficult to fill completely, the cast-in-situ bored pile is generally formed by adopting a pile casing as a retaining wall during construction. When in construction, the pile casing extends from the ground to the lower part of the underground waste hollow building structure, so that the slurry loss during pore forming can be effectively avoided, but after concrete pouring, the sleeve cannot be immediately pulled out in order to prevent pile body concrete from diffusing to the hollow underground waste building structure, and the pile casing cannot be pulled out after the concrete is dried, so that the cost of the pile casing is high.
With respect to the related art in the above, the applicant believes that the following drawbacks exist: the cast-in-place pile is high in cost for penetrating through the pile casing of the underground waste hollow building structure.
Disclosure of Invention
In order to reduce the cost of a pile casing for a filling pile to penetrate through an underground waste hollow building structure, the application provides a pile casing for a filling pile to penetrate through an underground waste hollow building structure and a construction method.
In a first aspect, the present application provides a pile casing for a bored pile penetrating through an underground waste hollow building structure, which adopts the following technical scheme:
the utility model provides a bored concrete pile passes through a pile casing of underground old and useless hollow building structure, includes the barrel, the one end of barrel is equipped with a plurality of slide holes of circumference distribution, every the slide hole all slides and runs through there is the bracing piece, be equipped with the toper post in the barrel, toper post swing joint the barrel, the diameter of toper post from top to bottom grow gradually, the bracing piece is located one end in the barrel is connected the toper post can break away from the toper post, the toper post is connected with the stay cord, the stay cord is followed the barrel is kept away from the one end of bracing piece wears out.
Through adopting above-mentioned technical scheme, pull up the toper post through the stay cord, promote the bracing piece outside the barrel for the one end of bracing piece extends outside the barrel, and the bracing piece supports in the old and useless hollow building structure in underground, keeps the pile casing stable, reduces the subsidence of pile casing, thereby makes the pile casing can seal the space of old and useless hollow building structure department in underground, and the upper end of pile casing need not to extend to ground moreover, reduces the cost of pile casing.
Preferably, a magnet is mounted on the conical column, and the magnet generates magnetic attraction force on the support rod.
Through adopting above-mentioned technical scheme, thereby produce the one end butt that the magnetic attraction kept the bracing piece through magnet to the bracing piece on the toper post, and when the toper post draws up, only need to exert certain ascending effort to the toper post and just can conveniently break away from bracing piece and magnet, need not to carry out other operations in addition and make bracing piece and toper post break away from.
Preferably, the support rod is arranged at one end in the cylinder body, a sliding block is arranged at one end in the cylinder body, the sliding block is abutted to the outer wall of the conical column, a sinking groove is formed in the inner end of the sliding hole, and the sliding block can enter the sinking groove.
Through adopting above-mentioned technical scheme, the slider can restrict the length that the bracing piece moved outwards, avoids the bracing piece to wholly remove outside the barrel and break away from the condition emergence of barrel, and after the slider got into the heavy groove, can keep follow-up pouring pile intact, avoids follow-up pouring pile to appear the recess in slider department and lead to the condition emergence that the bearing capacity of pouring pile reduces.
Preferably, the sliding block is fixedly sleeved with a sealing ring, the sealing ring has elasticity, an annular groove is formed in the peripheral wall of the sinking groove, and the sealing ring can enter the annular groove.
By adopting the technical scheme, after the sealing ring enters the annular groove, the sliding block can be kept to stay in the sinking groove, and the supporting rod is prevented from moving towards the cylinder body.
Preferably, the diameter of the lower end of the tapered column is equal to the inner diameter of the cylinder.
By adopting the technical scheme, the conical column can push the supporting rod out of the inner cavity of the cylinder body, so that the cast-in-place pile cast in place subsequently is kept complete.
Preferably, the support rod is arranged at one end outside the cylinder body, and is provided with a limiting ring, and the outer diameter of the limiting ring is larger than the diameter of the sliding hole.
Through adopting above-mentioned technical scheme, the limit ring can avoid the bracing piece to all enter into the inner chamber of barrel and break away from the condition emergence of slide hole, keeps the bracing piece stable with the connection of slide hole.
In a second aspect, the construction method for the bored concrete pile to pass through the underground waste hollow building structure provided by the application adopts the following technical scheme:
a construction method for a filling pile to pass through an underground waste hollow building structure comprises the following steps:
site investigation: surveying a project site by using a geological radar, determining the plane position relation between a pile position and an underground waste hollow building structure, and recording the depth and the size of the underground waste hollow building structure;
primary drilling: soil body reinforcement is carried out on the water-rich thick sand layer through double-liquid grouting, then a drilling machine is adopted to drill holes to the position 1-1.5m below the lower edge of the underground waste hollow building structure, and a drill rod is lifted;
and (3) injecting concrete: injecting a certain amount of concrete into the drilled hole, so that the concrete is piled up in the underground waste hollow building structures and surrounds the periphery of the drilled hole;
and (5) lowering the protective cylinder: manufacturing a pile casing according to the size of the underground waste hollow building structure for site investigation, lowering the pile casing to the bottom of a hole, enabling the upper end of the pile casing to be 1-1.5m above the upper edge of the underground waste hollow building structure, enabling concrete piled in the underground waste hollow building structure to cling to the outer wall of the pile casing, enabling one end of a supporting rod arranged outside the pile casing to be wrapped in the concrete in the underground waste hollow building structure, pulling a conical column out of a drilled hole through a pull rope, enabling the conical column to move upwards to push the supporting rod out of the pile casing, enabling the supporting rod to be transversely inserted into the concrete piled in the underground waste hollow building structure, and finally pulling out the concrete in the pile casing;
leading holes to the upper end of the protective barrel: leading holes around the drilled holes to the upper end of the pile casing, then discharging casing materials from the guide holes, and then discharging sleeve valve pipes for pressure grouting to strengthen soil around the upper end of the pile casing, so that the soil around the pile casing is tightly pressed against the upper end of the pile casing;
the hole is led to the lower part of the lower end of the protective barrel: leading holes at two sides of a plane projection position of an underground waste hollow building structure to a position 2m below the lower end of the pile casing, and then reinforcing soil below the pile casing by adopting jet grouting;
secondary drilling: drilling the drill rod through the casing to form a hole until the designed elevation is reached;
piling: and cleaning the drilled holes, pouring concrete and finishing the pouring piles.
By adopting the technical scheme, the water-rich thick sand layer is reinforced by double-liquid grouting before primary drilling, so that the dependence on slurry retaining wall when a cast-in-place pile hole penetrates through the thick sand layer at the upper part can be reduced, and after a drill rod penetrates through an underground waste hollow building structure, the drilled hole can be kept stable and not collapse under the condition that the slurry retaining wall is not formed, thereby providing basic conditions for subsequent smooth lowering of the underground waste hollow building structure and the retaining cylinder; the upper end of the protective cylinder is arranged at the position 1-1.5m above the upper edge of the underground waste hollow building structure, and the lower end of the protective cylinder is arranged at the position 1-1.5m below the lower edge of the underground waste hollow building structure, so that the length of the protective cylinder can be manufactured according to the size of the underground waste hollow building structure, the protective cylinder does not need to extend to the ground, and the manufacturing cost of the protective cylinder is reduced; before the pile casing is lowered, concrete is injected into the underground waste hollow building structure, the concrete surrounds the periphery of the pile casing after the pile casing is lowered, one end of the supporting rod, which is arranged outside the cylinder, is pushed into the concrete, after the concrete is dried, the concrete and the pile casing are connected into an integrated structure, and the concrete is supported on the underground waste hollow building structure, so that the stability of the pile casing is improved, the settlement of the pile casing in the subsequent secondary drilling and piling processes is reduced, the situation that the upper end of the pile casing enters the underground waste hollow building structure to cause the subsequent pouring of a large amount of concrete is lost into the underground waste hollow building structure is avoided, and the piling quality is improved; after the pile casing is lowered, the upper end of the pile casing and the lower part of the lower end of the pile casing are reinforced through the guide holes, soil bodies at the upper end of the pile casing and below the pile casing are reinforced through grouting, the compactness of the soil bodies is improved, gaps between the pile casing and underground waste hollow building structures are closed, the loss of concrete in subsequent pouring is reduced, meanwhile, surrounding soil bodies tightly press the pile casing, the sinking amount of the pile casing in the secondary drilling and pile forming processes is further reduced, and the pile forming quality is improved.
Preferably, in site investigation, precipitation and pressure relief are performed before the periphery if the geology of the pressure-bearing water exists.
By adopting the technical scheme, the influence of the pressure-bearing water on the subsequent hole forming and the downward release of the protective cylinder is avoided.
Preferably, before concrete is injected, the hole plugging device is firstly put into a drill hole below the underground waste hollow building structure, the hole plugging device comprises a round pipe and a conical cover, the conical cover is fixed at the upper end of the round pipe, the conical cover is conical, the top of the conical cover is connected with a lifting rope, the lower end of the round pipe is put into the drill hole, the hole plugging device is pulled out through the lifting rope after concrete is put down, and then the protective barrel is put down.
By adopting the technical scheme, the hole plugging device is lowered before the concrete is injected, so that the concrete entering the drilled holes below the underground waste hollow building structure can be reduced, the resistance of the concrete to the pile casing entering the drilled holes below the underground waste hollow building structure is reduced, the pile casing is convenient to lower, and the support rod can penetrate into the concrete and be connected with the concrete into a whole, so that the pile casing is stably supported; the cone cover can guide the concrete falling onto the cone cover to the outside, so that the concrete is prevented from being accumulated on the cone cover.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the conical column is pulled up through the pull rope, the support rod is pushed out of the cylinder body, one end of the support rod extends out of the cylinder body, the support rod is supported in the underground waste hollow building structure, the protection cylinder is kept stable, the sedimentation of the protection cylinder is reduced, the protection cylinder can seal the space of the underground waste hollow building structure, the upper end of the protection cylinder does not need to extend to the ground, and the manufacturing cost of the protection cylinder is reduced;
2. soil body reinforcement is carried out on the water-rich thick sand layer through double-liquid grouting before primary drilling, so that dependence on slurry retaining wall when a cast-in-place pile pore-forming penetrates through the thick sand layer at the upper part can be reduced, after a drill rod penetrates through an underground waste hollow building structure, the drilling can be kept stable and not collapse under the condition that the slurry retaining wall is not formed, and foundation conditions are provided for subsequent smooth descending of penetrating through the underground waste hollow building structure and the retaining cylinder; the upper end of the protective cylinder is arranged at the position 1-1.5m above the upper edge of the underground waste hollow building structure, and the lower end of the protective cylinder is arranged at the position 1-1.5m below the lower edge of the underground waste hollow building structure, so that the length of the protective cylinder can be manufactured according to the size of the underground waste hollow building structure, the protective cylinder does not need to extend to the ground, and the manufacturing cost of the protective cylinder is reduced; before the pile casing is lowered, concrete is injected into the underground waste hollow building structure, the concrete surrounds the periphery of the pile casing after the pile casing is lowered, one end of the supporting rod, which is arranged outside the cylinder, is pushed into the concrete, after the concrete is dried, the concrete and the pile casing are connected into an integrated structure, and the concrete is supported on the underground waste hollow building structure, so that the stability of the pile casing is improved, the settlement of the pile casing in the subsequent secondary drilling and piling processes is reduced, the situation that the upper end of the pile casing enters the underground waste hollow building structure to cause the subsequent pouring of a large amount of concrete is lost into the underground waste hollow building structure is avoided, and the piling quality is improved; the accumulated concrete in the underground waste hollow building structures can seal the gap between the lower end of the protective cylinder and the underground waste hollow building structures; after the pile casing is lowered, the upper end of the pile casing and the lower part of the lower end of the pile casing are reinforced through the guide holes, soil bodies at the upper end of the pile casing and below the pile casing are reinforced through grouting, the compactness of the soil bodies is improved, gaps between the pile casing and underground waste hollow building structures are closed, the loss of concrete in subsequent pouring is reduced, meanwhile, surrounding soil bodies tightly press the pile casing, the sinking amount of the pile casing in the secondary drilling and pile forming processes is further reduced, and the pile forming quality is improved.
Drawings
Fig. 1 is a cross-sectional view of a casing of a bored concrete pile according to an embodiment of the present application traversing an underground waste hollow building structure.
Fig. 2 is a top view of a casing of a bored concrete pile according to an embodiment of the present application traversing an underground waste hollow building.
Fig. 3 is a schematic structural view of a support rod according to an embodiment of the present application.
Fig. 4 is a flow chart of a construction method of a cast-in-place pile penetrating through an underground waste hollow building structure according to an embodiment of the application.
Fig. 5 is a schematic diagram illustrating installation of a casing in a construction method of a bored pile penetrating through an underground waste hollow building structure according to an embodiment of the present application.
Reference numerals illustrate:
1. a cylinder; 2. a support rod; 21. a slide block; 22. a seal ring; 23. a limiting ring; 3. a tapered column; 4. a pull rope; 5. a magnet; 6. soil mass; 7. underground waste hollow building structures; 8. and (3) concrete.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-5.
The embodiment of the application discloses a pile casing for a filling pile penetrating through an underground waste hollow building structure and a construction method.
Referring to fig. 1 and 2, a pile casing for a bored pile penetrating through an underground waste hollow building structure comprises a cylinder body 1, wherein one end of the cylinder body 1 is provided with a plurality of sliding holes distributed along the circumference, each sliding hole is penetrated with a supporting rod 2 in a sliding manner, and the supporting rods 2 can move towards the radial direction of the cylinder body 1 along the sliding holes. The cylinder body 1 is internally provided with a conical column 3, the diameter of the conical column 3 gradually increases from top to bottom, the lower end of the conical column 3 is in sliding connection with the cylinder body 1, the conical column 3 can move up and down in the cylinder body 1 and separate from the cylinder body 1 from the upper end of the cylinder body 1, the upper end of the conical column 3 is connected with a pull rope 4, and the upper end of the pull rope 4 penetrates out from the upper end of the cylinder body 1. One end of the support rod 2 arranged in the cylinder body 1 is connected with the conical column 3 and can be separated from the conical column 3.
The lower end of the conical column 3 is provided with a cylinder with the diameter equal to the inner diameter of the cylinder body 1, and the cylinder is connected with the inner wall of the cylinder body 1 in a sliding way. The upper end of toper post 3 is equipped with the inner chamber, installs magnet 5 in the inner chamber, and magnet 5 can produce magnetic attraction to bracing piece 2 for bracing piece 2 locates the one end butt in barrel 1 on toper post 3, and toper post 3 is at the in-process that reciprocates in addition, and bracing piece 2 can slide on the outer wall of toper post 3, breaks away from the contact with toper post 3 finally.
Referring to fig. 3, one end of the support rod 2 in the cylinder 1 is provided with a slider 21, one side of the slider 21 abuts against the outer wall of the tapered column 3, a sealing ring 22 is fixedly sleeved outside the slider 21, the sealing ring 22 has elasticity, the inner end of the sliding hole is provided with a sinking groove, the peripheral wall of the sinking groove is provided with an annular groove, the slider 21 can enter the sinking groove, and the sealing ring 22 can enter the annular groove. When the lower end of the conical column 3 rises to the sliding hole, the sliding block 21 is completely pushed into the sinking groove, at the moment, the sealing ring 22 is pressed into the annular groove, the matching of the sealing ring 22 and the sealing groove can play a certain limiting role on the axial sliding of the supporting rod 2, the supporting rod 2 is prevented from sliding back, and the pushed-out state of the supporting rod 2 is kept stable. The slide block 21 is completely pushed into the sinking groove, so that the slide block 21 can be prevented from causing a notch on the outer wall of the cast-in-place pile formed later to reduce the bearing capacity of the cast-in-place pile. One end of the supporting rod 2 outside the cylinder body 1 is provided with a limiting ring 23, the outer diameter of the limiting ring 23 is larger than the diameter of the sliding hole, and the limiting ring 23 can prevent the supporting rod 2 from completely entering the inner cavity of the cylinder body 1 to be separated from the sliding hole.
The implementation principle of the pile casing of the filling pile penetrating through the underground waste hollow building structure is as follows: if the pile casing in the related art is used, as most of the length of the pile casing is arranged in the waste hollow building structure, the contact area between the pile casing and the soil body is small, the friction force between the pile casing and the soil body is small, the supporting force of the soil body below the pile casing is weakened when the pile casing is continuously drilled downwards, the pile casing is not enough to be supported for stability, the pile casing can be settled, and when the upper end of the pile casing is separated from the soil body by the settling distance of the pile casing, the pile casing loses the function of blocking the loss of the concrete poured later, the pile forming quality is reduced, and the pile forming cost is improved. In the embodiment of the application, the supporting rods 2 are added, the supporting rods 2 are supported on the waste hollow building structures, the pile casings can be supported, the pile casings are kept stable at the waste hollow building structures, the settlement of the pile casings is reduced, and the loss of concrete poured later is prevented. When the lower part protects the cylinder, the supporting rod 2 is pushed into the cylinder body 1 firstly, so that the sliding block 21 of the supporting rod 2 is abutted to the upper end of the conical column 3, the magnet 5 attracts the sliding block 21 to keep the supporting rod 2 stable, and the limiting ring 23 of the supporting rod 2 is tightly attached to the cylinder. And then the whole pile casing is lowered to the underground waste hollow building, the upper end of the pull rope 4 is placed on the ground, the lower end of the cylinder body 1 is arranged below the underground waste hollow building, and the upper end of the cylinder body 1 is arranged above the underground waste hollow building. And then the upper end of the pull rope 4 is pulled to pull up the conical column 3, the conical column 3 moves upwards, and the support rod 2 is pushed out of the cylinder body 1, so that one end of the support rod 2 extends out of the cylinder body 1, and the support rod 2 extends into an underground waste hollow building structure. When the cylinder body 1 sinks to a certain amount, the supporting rod 2 can be supported on the underground waste hollow building structure, so that the continuous settlement of the protection cylinder is prevented, the protection cylinder is kept stable, the length of the protection cylinder is only required to be larger than the height of the underground waste hollow building structure by a certain amount, the pile hole can be separated from the space in the underground waste hollow building structure, the upper end of the protection cylinder does not need to extend to the ground, the length of the protection cylinder can be reduced, and the cost of the protection cylinder is reduced.
Referring to fig. 4 and 5, the embodiment of the application also discloses a construction method for a bored pile to pass through an underground waste hollow building structure, which comprises the following steps:
site investigation: and (3) surveying the project site by using a geological radar, determining the plane position relation between the pile position and the underground waste hollow building 7, and recording the depth and the size of the underground waste hollow building 7. If the geology of the pressure-bearing water exists, the pressure is released before the peripheral precipitation. If the geology of investigation is a water-rich thick sand layer, the soil body 6 of the water-rich thick sand layer is reinforced by double-liquid grouting, and the reinforcing radius, the reinforcing range and the reinforcing depth of the double-liquid grouting are controlled according to the soil quality condition of the surface layer of the site, the water level height and the construction condition of the buried depth of the underground waste hollow building structure 7.
Primary drilling: adopting a rotary drilling rig to perform wet operation to form holes to the position 1m above the upper edge of the underground waste hollow building 7, then evacuating the wall protection slurry, then performing dry operation of the rotary drilling rig to form holes to the position 1-1.5m below the lower edge of the underground waste hollow building 7, and then lifting the drill rod.
And (3) injecting concrete 8: and (3) introducing a grouting pipe into the underground waste hollow building 7 from the drill hole, and injecting a certain amount of concrete 8 into the underground waste hollow building 7, so that the concrete 8 is piled in the underground waste hollow building 7 and surrounds the periphery of the drill hole, the thickness of the piled concrete 8 is not less than 20cm, and the width of the piled concrete 8 is not less than the width of the supporting rod 2.
And (5) lowering the protective cylinder: the pile casing is manufactured according to the size of the underground waste hollow building 7 for site investigation, when the distance between the support rod 2 and the lower end face of the pile casing meets the requirement that the lower end of the pile casing is lowered to the bottom of a hole, the support rod 2 is positioned in the underground waste hollow building 7 and is 5-10cm away from the ground in the underground waste hollow building 7, and when the length of the pile casing meets the requirement that the lower end of the pile casing is lowered to the bottom of the hole, the upper end of the pile casing is positioned 1-1.5m above the upper edge of the underground waste hollow building 7. The support rod 2 of the manufactured pile casing is pushed inwards towards the cylinder body 1, the support rod 2 is abutted to the upper end of the conical column 3, then the pile casing is lowered to the bottom of a hole, the concrete 8 piled in the underground waste hollow building 7 can be tightly attached to the outer wall of the pile casing, part of the concrete 8 can enter the pile casing, and at the moment, one end of the support rod 2 arranged outside the cylinder body 1 is wrapped in the concrete 8 in the underground waste hollow building 7. Then the conical column 3 is pulled out of the cylinder 1 upwards through the pull rope 4 and a hole is drilled, the support rod 2 is pushed out of the cylinder 1 when the conical column 3 moves upwards, the support rod 2 is transversely inserted into the concrete 8 piled in the underground waste hollow building 7, and the concrete 8 wraps the support rod 2 under the action of gravity. Then, a slurry pipe is introduced into the cylinder 1 to draw out the concrete 8 in the cylinder 1.
Leading holes to the upper end of the protective barrel: and (3) guiding holes around the drilled holes to the upper end of the protective cylinder, then discharging the shell material from the guide holes, and then discharging the sleeve valve pipe for pressure grouting, so as to strengthen soil body 6 around the upper end of the cylinder 1, enable the soil body 6 around the cylinder 1 to press the upper end of the cylinder 1, seal a gap between the upper end of the cylinder 1 and an underground waste hollow building 7, and improve friction between the cylinder 1 and the soil body 6.
The hole is led to the lower part of the lower end of the protective barrel: and holes are led to the position 2m below the lower end of the pile casing at the two sides of the plane projection position of the underground waste hollow building structure 7, then high-pressure jet grouting is adopted to reinforce the soil body 6 below the pile casing, the gap between the lower end of the cylinder 1 and the underground waste hollow building structure 7 is closed, and meanwhile, the friction force between the cylinder 1 and the soil body 6 is improved.
Secondary drilling: after reaching the drying time of the concrete 8 in the underground waste hollow building 7, the drill rod is put into the hole along the drill hole and passes through the cylinder body 1 to continuously drill down into the hole until the designed elevation is reached.
Piling: and cleaning the drilled holes, filling concrete into the steel reinforcement cages below the drilled holes to form the cast-in-place piles.
The concrete 8 injected into the underground waste hollow building 7 adopts quick-drying concrete 8 with the setting time of one hour, and after the concrete 8 is injected into the underground waste hollow building 7, the lower part of the pile casing must be protected to the bottom of the hole within half an hour, so that the situation that the pile casing cannot be lowered to the bottom of the hole due to the setting of the concrete 8 is avoided.
In another embodiment, before injecting the concrete 8, the hole plugging device is firstly put into the drill hole below the underground waste hollow building structure 7, the hole plugging device comprises a circular tube and a conical cover, the outer diameter of the circular tube is gradually reduced from top to bottom, the conical cover is fixed at the upper end of the circular tube, the conical cover is conical, the top of the conical cover is connected with a lifting rope, the lower end of the circular tube is put into the drill hole, the hole plugging device is pulled out through the lifting rope after the concrete 8 is put into place, and then the protective cylinder is put into place. The hole blocking device can reduce the concrete 8 entering the drilling holes below the underground waste hollow building 7, the concrete 8 cannot fall into the drilling holes quickly after being lifted by the hole blocking device, the obstruction of the concrete 8 on the protection barrel entering the drilling holes below the underground waste hollow building 7 is reduced, and the protection barrel is convenient to drop.
The implementation principle of the construction method for the filling pile to penetrate through the underground waste hollow building 7 is as follows: the length of the cylinder body 1 is 2-3m larger than the height of the underground waste hollow building structure 7, and the length of the protection cylinder is reduced, so that the manufacturing cost of the protection cylinder is reduced. Soil body 6 is reinforced on the water-rich thick sand layer by double-liquid grouting before primary drilling, so that the dependence on slurry retaining wall when a cast-in-place pile hole penetrates through the thick sand layer at the upper part can be reduced, and foundation conditions are provided for subsequent smooth lowering of the underground waste hollow building 7 and the retaining cylinder. Before the pile casing is lowered, concrete 8 is injected into the underground waste hollow building 7, the concrete 8 surrounds the periphery of the pile casing after the pile casing is lowered, one end of the supporting rod 2, which is arranged outside the cylinder body 1, is pushed into the concrete 8, after the concrete 8 is dried, the concrete 8 and the pile casing are connected into an integrated structure, and the concrete 8 is supported on the underground waste hollow building 7, so that the stability of the pile casing is improved, and the settlement of the pile casing in the subsequent secondary drilling and piling processes is reduced. After the pile casing is lowered, the upper end of the pile casing and the lower part of the lower end of the pile casing are reinforced through the guide holes, soil bodies 6 at the upper end of the pile casing and below the pile casing are reinforced through grouting, the compactness of the soil bodies 6 is improved, gaps between the pile casing and the underground waste hollow building structures 7 are closed, the loss of concrete in subsequent pouring is reduced, meanwhile, the peripheral soil bodies 6 tightly force the pile casing, the sinking amount of the pile casing in the secondary drilling and pile forming processes is further reduced, and the pile forming quality is improved.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (7)
1. A pile casing of bored concrete pile crossing underground old and useless hollow building structure, its characterized in that: the novel sliding support comprises a cylinder body (1), wherein a plurality of sliding holes distributed along the circumference are formed in one end of the cylinder body (1), each sliding hole is penetrated by a supporting rod (2) in a sliding mode, a conical column (3) is arranged in the cylinder body (1), the conical column (3) is movably connected with the cylinder body (1), the diameter of the conical column (3) gradually increases from top to bottom, one end of the supporting rod (2) arranged in the cylinder body (1) is connected with the conical column (3), the conical column (3) is connected with a pull rope (4), and the pull rope (4) penetrates out from one end, away from the supporting rod (2), of the cylinder body (1);
a magnet (5) is arranged on the conical column (3), and the magnet (5) generates magnetic attraction force on the support rod (2);
the support rod (2) is arranged at one end in the cylinder body (1) and is provided with a sliding block (21), the sliding block (21) is abutted to the outer wall of the conical column (3), a sinking groove is formed in the inner end of the sliding hole, and the sliding block (21) can enter the sinking groove.
2. A casing for a bored concrete pile penetrating through an underground waste hollow building structure according to claim 1, wherein: the sliding block (21) is fixedly sleeved with a sealing ring (22), the sealing ring (22) has elasticity, an annular groove is formed in the peripheral wall of the sinking groove, and the sealing ring (22) can enter the annular groove.
3. A casing for a bored concrete pile penetrating through an underground waste hollow building structure according to claim 1, wherein: the diameter of the lower end of the conical column (3) is equal to the inner diameter of the cylinder (1).
4. A casing for a bored concrete pile penetrating through an underground waste hollow building structure according to claim 1, wherein: one end of the supporting rod (2) arranged outside the cylinder body (1) is provided with a limiting ring (23), and the outer diameter of the limiting ring (23) is larger than the diameter of the sliding hole.
5. A method of constructing a casing for a bored concrete pile penetrating through an underground waste hollow building structure as set forth in any one of claims 1 to 4, comprising the steps of:
site investigation: surveying a project site by using a geological radar, determining the plane position relation between a pile position and an underground waste hollow building structure (7), and recording the depth and the size of the underground waste hollow building structure (7);
primary drilling: soil (6) is reinforced on the water-rich thick sand layer through double-liquid grouting, then a drilling machine is adopted to drill holes to the position 1-1.5m below the lower edge of the underground waste hollow building structure (7), and a drill rod is lifted;
injecting concrete (8): injecting a certain amount of concrete (8) into the drill hole, so that the concrete (8) is piled up in the underground waste hollow building (7) and surrounds the drill hole;
and (5) lowering the protective cylinder: the pile casing is lowered to the bottom of the hole, the upper end of the pile casing is located at a position 1-1.5m above the upper edge of the underground waste hollow building structure (7), concrete (8) piled in the underground waste hollow building structure (7) can be tightly attached to the outer wall of the pile casing, one end, arranged outside the cylinder (1), of the supporting rod (2) is wrapped in the concrete (8), then the conical column (3) is pulled out of the hole through the pull rope (4), the conical column (3) moves upwards to push the supporting rod (2) to the outside of the cylinder (1), and the supporting rod (2) is transversely inserted into the concrete (8) piled in the underground waste hollow building structure (7);
leading holes to the upper end of the protective barrel: guiding holes around the drilled holes to the upper end of the pile casing, then discharging casing materials from the guide holes, and then discharging sleeve valve pipe for pressure grouting, so as to strengthen soil (6) around the upper end of the pile casing, and enable the soil (6) around the pile casing to press the upper end of the pile casing;
the hole is led to the lower part of the lower end of the protective barrel: leading holes at two sides of a plane projection position of an underground waste hollow building structure (7) to a position 2m below the lower end of the pile casing, and then reinforcing soil (6) below the pile casing by adopting jet grouting;
secondary drilling: drilling the drill rod through the casing to form a hole until the designed elevation is reached;
piling: and cleaning the drilled holes, pouring concrete and finishing the pouring piles.
6. The construction method for the pile casing of the filling pile penetrating through the underground waste hollow building structure according to claim 5, which is characterized in that: in site investigation, if the geology of the pressure-bearing water exists, the periphery is subjected to precipitation and pressure relief before the geology of the pressure-bearing water exists.
7. The construction method for the pile casing of the filling pile penetrating through the underground waste hollow building structure according to claim 5, which is characterized in that: before injecting concrete (8), firstly, a hole plugging device is put down into a drill hole below an underground waste hollow building structure (7), the hole plugging device comprises a round pipe and a conical cover, the conical cover is fixed at the upper end of the round pipe, the conical cover is conical, the top of the conical cover is connected with a lifting rope, the lower end of the round pipe is put into the drill hole, the hole plugging device is pulled out through the lifting rope after the concrete (8) is put down, and then the protective cylinder is put down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211063206.XA CN115404849B (en) | 2022-09-01 | 2022-09-01 | Pile casing for filling pile penetrating through underground waste hollow building structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211063206.XA CN115404849B (en) | 2022-09-01 | 2022-09-01 | Pile casing for filling pile penetrating through underground waste hollow building structure and construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115404849A CN115404849A (en) | 2022-11-29 |
| CN115404849B true CN115404849B (en) | 2023-06-23 |
Family
ID=84163229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211063206.XA Active CN115404849B (en) | 2022-09-01 | 2022-09-01 | Pile casing for filling pile penetrating through underground waste hollow building structure and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115404849B (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005273293A (en) * | 2004-03-25 | 2005-10-06 | Okadagumi:Kk | Excavating method |
| CN212375849U (en) * | 2020-04-22 | 2021-01-19 | 广东裕基建筑工程有限公司 | Manual hole digging pile structure |
-
2022
- 2022-09-01 CN CN202211063206.XA patent/CN115404849B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115404849A (en) | 2022-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8043028B2 (en) | Apparatus for providing a support column | |
| US9567723B2 (en) | Open-end extensible shells and related methods for constructing a support pier | |
| CN111395330B (en) | Construction method for concrete cast-in-situ bored pile complete steel casing penetrating through underground gallery | |
| US8573892B2 (en) | Method of providing a support column | |
| CN111173038B (en) | Construction process of vertical shaft | |
| CN113174958A (en) | Construction method for foundation pit of adjacent road under poor ground condition | |
| CN110735432A (en) | Method for clearing pile foundation and controlling parameters in shield tunneling machine over-invasion limit tunnel range | |
| CN102808407B (en) | Construction method of soft-foundation reinforced concrete cast-in-place pile | |
| CN211421112U (en) | Double-casing pore-forming structure of karst geological pile foundation | |
| KR101543209B1 (en) | Boring and grouting constructuring method and post with Geo tube | |
| CN112962590B (en) | Large-diameter cast-in-situ thin-wall prestressed concrete steel pipe pile and construction method thereof | |
| CN111042121B (en) | Construction method of bored backfill end pile foundation | |
| CN115404849B (en) | Pile casing for filling pile penetrating through underground waste hollow building structure and construction method | |
| CN209891202U (en) | Anti-floating anchor rod | |
| CN209339143U (en) | A kind of concrete pipe pile construction equipment | |
| CN115949098A (en) | Anti-floating plate structure and method for weak geological punching supporting pile reinforcement cage | |
| CN109339044A (en) | A kind of concrete pipe pile construction equipment | |
| CN108086322B (en) | Mud skin removing device and method for improving bearing capacity of cast-in-place pile by using same | |
| CN112211187A (en) | Reinforcement cage structure for karst area pile foundation and pile foundation construction method | |
| CN107476293A (en) | A kind of quick spreading structure of soft soil foundation bored concrete pile configures and its spreading method | |
| KR101622391B1 (en) | Method for constructing sea-bottom using eco water-proof structure | |
| CN205857212U (en) | Corrugated steel cofferdam borehole hollow pile | |
| CN112482365B (en) | Construction method and device for deep silt geological long pile foundation | |
| CN217053429U (en) | Device for rapidly and effectively blocking sudden water burst of underground engineering | |
| CN112431195B (en) | Pile planting and grouting construction method for tubular piles |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |