CN114351693A - Collapse hole underpinning device for rotary excavating cast-in-place pile and underpinning construction method - Google Patents
Collapse hole underpinning device for rotary excavating cast-in-place pile and underpinning construction method Download PDFInfo
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Abstract
The invention provides a collapse hole underpinning device for a rotary excavating cast-in-place pile, which relates to the technical field of pile hole replacement construction and comprises the following components: a gap h is formed between the outer wall of the steel casing and the wall of the pile hole, a top cover is fixed at one end of the steel casing, and a hanging structure is fixed on the top cover; the centering support is provided with a plurality of centering supports which are distributed at equal intervals along the circumferential direction of the steel casing. The invention also provides a collapsed hole underpinning construction method of the rotary excavating cast-in-place pile, which comprises the following steps: s1, hanging the steel casing into the pile hole and lowering the steel casing to the hole collapse area, locating the centering bracket above the hole collapse area, locating the seam-stopping plug below the hole collapse area and blocking a gap h between the steel casing and the hole wall; s2, pouring replacement concrete into the gap h between the steel casing and the hole wall; s3, when the replacement concrete reaches the preset strength, the steel casing is pulled out of the pile hole. The invention can avoid secondary hole collapse after support replacement, avoid the problem of embedding the protective cylinder, reduce the replacement and filling amount of concrete and reduce the construction cost.
Description
Technical Field
The invention relates to the technical field of pile hole replacement construction, in particular to a collapse hole underpinning device and a replacement construction method for a rotary excavating cast-in-place pile.
Background
When a hole collapse occurs in rotary excavating construction, three wall protection measures of slurry wall protection, steel casing wall protection and concrete replacement and filling are usually adopted, but the three measures have the following defects:
(1) slurry wall protection: the filling is loose and large in pore space, slurry leakage is serious, the wall protection effect is poor, a vicious circle of 'hole collapse-hole digging and slag fishing' is formed, the occurrence of the hole collapse phenomenon is further aggravated, the construction progress is slow, the filling coefficient of the pile body concrete is large, and the economical efficiency is poor;
(2) and (3) protecting the wall of the steel casing: the wall protection effect of the steel casing is good, but if the filling thickness is large, the length of the embedded casing needs to be long, so that the later-stage casing is difficult to remove, and the casing is embedded, so that the construction difficulty is high and the cost is high; in addition, the pile body concrete is poured, and then the pile casing is pulled upwards, so that space is provided for soil body collapse due to the fact that the concrete is not initially set, soil bodies around the pile collapse into the pile body concrete, and the quality of the pile body is affected.
(3) Concrete replacement and filling: backfilling low-grade concrete in the hole, reinforcing soil around the hole by the concrete, and repeatedly replacing and filling the deep soil filling area for many times, wherein the consumption of the concrete is large and the economical efficiency is very poor; in addition, when the hole is formed again after the concrete is replaced and filled, the rotary drilling equipment needs to firstly dig and break the concrete replaced and filled in the pile core area, so that the hole forming speed is slow, and the construction period is seriously delayed.
Disclosure of Invention
The invention aims to provide a collapsed hole underpinning device for a rotary excavating cast-in-place pile, which is designed aiming at the collapsed hole underpinning device, is quick in construction, can avoid secondary collapsed hole after underpinning, can avoid the problem of burying a protective cylinder, can reduce the replacement and filling amount of concrete, and reduces the construction cost.
The invention also aims to provide a collapsed hole underpinning construction method of the rotary excavating cast-in-place pile, which is designed aiming at the collapsed hole underpinning construction method, has quick construction, can avoid secondary collapsed hole after underpinning, can avoid the problem of burying a protection cylinder, can reduce the replacement and filling amount of concrete, and reduces the construction cost.
The embodiment of the invention is realized by the following technical scheme:
dig bored concrete pile hole collapse underpinning device soon, it includes: a gap h is formed between the outer wall of the steel casing and the wall of the pile hole, a top cover is fixed at one end of the steel casing, a hanging structure is fixed on the top cover, and the top cover is provided with a material guide surface; the centering support is provided with a plurality of centering supports and is fixed on the outer wall of the steel casing, and the plurality of centering supports are distributed at equal intervals along the circumferential direction of the steel casing.
In an embodiment of the invention, the steel casing further comprises a seam-stopping plug, the seam-stopping plug is fixed to the steel casing, and the seam-stopping plug and the top cover are respectively located at two ends of the steel casing.
In an embodiment of the invention, the outer wall of the steel casing is provided with a release agent.
In an embodiment of the invention, the steel casing comprises a starting casing segment and at least one standard casing segment, one end of the starting casing segment is fixed with the top cover, the other end of the starting casing segment is fixed with the standard casing segment, and two adjacent casing segments are spliced and fixed.
In an embodiment of the invention, the hanging structure is a hanging ring.
The collapse hole underpinning construction method for the rotary excavating cast-in-place pile utilizes the collapse hole underpinning device for the rotary excavating cast-in-place pile, and comprises the following steps:
s1, hanging the steel casing into the pile hole and lowering the steel casing to the collapsed hole area, wherein the bottom of the steel casing is placed at the top of the piled earthwork at the bottom of the hole;
s2, pouring first replacement filling concrete into a gap h between the steel casing and the hole wall;
s3, when the first replacement filling concrete reaches the preset strength, pulling the steel pile casing out of the pile hole, removing the redundant replacement filling concrete and fishing out the preset amount of piled earthwork;
s4 repeats S1 to S3 until all the heaped earthwork is fished out and the entire collapsed area is filled.
In an embodiment of the present invention, in step S1, before the steel casing is lowered, a release agent is coated on the outer wall of the steel casing.
The collapse hole underpinning construction method for the rotary excavating cast-in-place pile utilizes the collapse hole underpinning device for the rotary excavating cast-in-place pile, and comprises the following steps:
s1, hanging the steel casing into the pile hole and lowering the steel casing to the hole collapse area, locating the centering bracket above the hole collapse area, locating the seam-stopping plug below the hole collapse area and blocking a gap h between the steel casing and the hole wall;
s2, pouring replacement concrete into the gap h between the steel casing and the hole wall;
s3, when the replacement concrete reaches the preset strength, the steel casing is pulled out of the pile hole.
In an embodiment of the present invention, in step S1, before the steel casing is lowered, a release agent is coated on the outer wall of the steel casing.
In an embodiment of the present invention, a length of the steel casing is greater than a length of the collapsed hole region.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
the embodiment of the invention adopts a underpinning device comprising a steel casing and a centering bracket, the steel casing is hung and placed to a collapsed hole area in a hole by using a hanging structure, the posture of the steel casing in the hole is modified by using the centering bracket, so that the steel casing is centered with the center of a pile hole, a gap h communicated with the collapsed hole area is formed between the steel casing and the wall of the pile hole, filling replacement concrete is poured into the gap h, the collapsed hole area is filled by using the replacement concrete, and the steel casing is pulled out of the pile hole after the replacement concrete reaches a preset strength. Compared with the prior art, this embodiment construction is swift, avoids trading the support district through trading the filled concrete and appears the secondary hole that collapses, can avoid appearing burying the problem of protecting a section of thick bamboo, and the concrete volume of using is few moreover, can reduce the concrete volume of trading and filling, reduces construction cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed 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 invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic diagram of a second embodiment of the present invention;
fig. 4 is a schematic diagram of a trusting method in a third embodiment of the present invention.
Icon: 1-steel casing, 11-initial casing segment, 12-standard casing segment, 2-top cover, 21-material guide surface, 3-concrete feed inlet, 4-centering bracket, 5-seam stop plug, 6-hanging ring, 81-crossbeam, 82-steel rope, 9-pile hole, 91-gap h, 92-hole collapse region and 93-heaped earthwork.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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 invention.
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 invention, it should be noted that if the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the present invention is used, the description is merely for convenience of describing the present invention and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and operation, and thus, cannot be understood as the limitation of the present invention.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "configured," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 1 to 4, the present embodiment provides a collapse hole underpinning device for a rotary excavating cast-in-place pile, including: a steel casing 1 and a centering bracket 4.
The outer diameter of the steel casing 1 is slightly smaller than the diameter of the pile hole 9, in the embodiment, the outer diameter of the steel casing 1 is 100-200 mm smaller than the diameter of the pile hole 9, after the steel casing 1 is placed in the pile hole 9, a gap h91 is formed between the outer wall of the steel casing 1 and the wall of the pile hole 9, the gap h91 is communicated with the hole collapse area 92, concrete is poured into the gap h91 and the hole collapse area 92 to fill the hole collapse area 92, and support replacement is achieved. The length of the steel casing 1 is increased or decreased as required, but the length L1 of the steel casing is required to be greater than the length L2 of the collapsed hole, so as to ensure the integrity and the centrality of the underpinning, for example, the length L1 of the steel casing 1 is required to be greater than 3m, such as 3.5m, when the length L2 of the collapsed hole is detected to be 3 m. For the increase and decrease of the length of the steel casing, the steel casing can be customized to a set length according to actual needs, and if the steel casing 1 with the length of 4m is needed, the steel casing 1 with the length of 4m is customized; the steel casing 1 may also increase or decrease the length by splicing a plurality of sections, specifically, in this embodiment, the steel casing 1 of this embodiment includes an initial casing section 11 and at least one standard casing section 12, the initial casing section 11 is spliced with one standard casing section 12, the remaining standard casing sections 12 are sequentially spliced, both the initial casing section 11 and the standard casing section 12 and the adjacent two standard casing sections 12 may be fixed by welding, when the length of the whole steel casing 1 needs to be shortened, a part of the standard casing section 12 is cut and removed, and both the initial casing section 11 and the standard casing section 12 and the adjacent two standard casing sections 12 may be fixed by other methods such as bolting.
A top cover 2 is welded at one end of the initial casing section 11, and the other end of the initial casing section 11 is fixed with a standard casing section 12 by using a head of the top cover 2. The top cover 2 is made of steel plates, the top cover 2 is in a frustum pyramid shape, the inclined plane of the frustum pyramid is a material guide surface 21 so as to guide concrete to enter the gap h91, and after the steel casing is placed in the pile hole 9, a concrete feed port 3 is formed in the area between the material guide surface 21 and the inner wall of the pile hole 9, and the concrete feed port 3 is communicated with the gap h 91. It should be noted that the dome 2 may be conical or circular. Still weld on overhead guard 2 and have suspended structure to be connected with the hoisting equipment on ground, suspended structure can be rings 6 or lifting hook etc. and the suspended structure is rings 6 in this embodiment, before steel casing 1 lowered pile hole 9, and rings 6 is last to be tied and is had a lifting rope. When the steel casing 1 is placed in a preset position of the pile hole 9 through the automobile crane, an I-shaped steel cross beam 81 is arranged at the opening of the pile hole 9, and a lifting rope buckle is used for fixing a lifting rope of the lifting ring 6 on the I-shaped steel cross beam 81, so that the position of the steel casing 1 in the pile hole 9 is fixed. The lifting rope is buckled by a commercially available finished steel rope 82.
Because the outer diameter of the steel casing 1 is slightly smaller than the diameter of the pile hole 9, after the steel casing 1 is placed in the pile hole 9, in order to prevent deviation of the device, in order to enable the center of the steel casing 1 to be aligned with the center of the pile hole 9, the centering support 4 is provided with a plurality of steel bars and fixed on the outer wall of the steel casing 1, the centering support 4 can be made by bending steel bars or welding a plurality of steel bar sections, the centering support 4 is distributed along the circumference of the steel casing 1 at equal intervals, in the embodiment, the centering support 4 is made by bending steel bars, four centering supports 4 are welded on the steel casing 1, the centering support 4 is provided with a wall attaching section, after the steel casing 1 is placed in the pile hole 9, the wall attaching section slides along the hole wall, and the center of the steel casing 1 is aligned with the center of the pile hole 9 through the four centering supports 4, so that a better underpinning effect is achieved.
In this embodiment, after the replacement and filling concrete is solidified and reaches a certain strength, a constructor needs to use a hoisting device to pull the steel casing 1 out of the pile hole 9, and in order to facilitate the steel casing 1 to be separated from the replacement and filling concrete, a release agent is coated on the outer wall of the steel casing 1 before the steel casing 1 is put down, so that the steel casing 1 can be smoothly released.
If the piled earthwork 93 generated by the collapse of the hole wall is piled up to a height higher than the lowest portion of the hole collapse area 92 as shown in fig. 3, the bottom of the steel casing 1 can be directly put on the piled earthwork 93 when the steel casing 1 is used. If the stacking height of the stacked earthwork 93 generated by the collapse of the hole wall is lower than the lowest position of the collapsed hole region 92, that is, the collapsed hole region 92 is located above the stacked earthwork 93, as shown in fig. 4, when the steel casing 1 is used, a seam-stopping plug 5 needs to be bonded to the bottom of the steel casing 1 to block the gap between the steel casing 1 and the hole wall of the pile hole 9, so as to prevent the replacement concrete from passing through and losing from the gap between the steel casing 1 and the hole wall of the pile hole 9. The seam-stopping plug 5 can be made of rubber, so that the seam-stopping plug 5 can be smoothly placed into the pile hole 9, the steel pile casing 1 and the seam-stopping plug 5 are fixed in a bonding mode, the steel pile casing 1 can be smoothly demoulded when demoulded, and if the seam-stopping plug 5 and the steel pile casing 1 are fixed by bolts or other modes, the demoulding resistance of the steel pile casing 1 can be increased, and even the smooth demould cannot be realized.
Example two
As shown in FIG. 3, for the case that the piled earthwork 93 generated by the collapse of the hole wall is piled up to a height higher than the lowest position of the collapsed hole area 92, which is often found near the drill bit, when the hole is drilled and the slag is fished, the backfill structure is loose or large stones exist, the surrounding soil body is disturbed by mechanical rotation, and the side wall of the area near the drill bit is collapsed. The embodiment provides a collapse hole underpinning construction method for a rotary excavating cast-in-place pile, which utilizes the collapse hole underpinning device for the rotary excavating cast-in-place pile, adopts the principle of batch underpinning and batch slag salvaging, and specifically comprises the following steps:
s0, detecting the length of the collapsed hole area 92, determining the length L1 of the steel casing according to the length L2 of the collapsed hole area, and determining the length L1 of the steel casing according to the relation that the length L1 of the steel casing is 0.5m longer than the length L2 of the collapsed hole area, wherein the difference between L1 and L2 can be more than 0.5m, and the specific difference is determined by a person skilled in the art according to actual conditions. L1 is larger than L2, so that the positions of the top cover 2 and the centering bracket 4 are higher than the highest point A of the hole collapse area 92, and the steel casing 1 can cover the hole collapse area 92 to ensure the integrity and the centering of underpinning. If the centering support 4 is lower than the highest point A of the collapsed hole area 92, namely the centering support 4 is located in the collapsed hole area 92, due to the irregularity of the collapsed hole area 92, the top of the steel casing 1 can shake, so that underpinning deviation can be caused, and when the later rotary excavating and pore forming construction is carried out, the pile body is deviated due to the asymmetry of the filling concrete, so that the verticality of the pile body is influenced.
In the present embodiment, the collapsed hole region length L2 refers to the length of the cavity region in the collapsed hole region 92, the collapsed hole region length L2 refers to the length of the cavity region in the first replacement, and the collapsed hole region length L2 refers to the length of the cavity region in the second replacement.
After determining the length L1 of the steel casing, the standard casing segment 12 is welded with the initial casing segment 11 as required, and if a part of the standard casing segment 12 needs to be cut to meet the length L1, a person skilled in the art can cut the standard casing segment 12 as required.
S1, brushing a release agent on the outer wall of the steel casing 1, tying a lifting rope on a lifting ring 6, lifting the steel casing 1 into a pile hole 9 by using lifting equipment, and lowering the steel casing to a hole collapse area 92 until the bottom of the steel casing 1 is placed at the top of a hole bottom piled earthwork 93, plugging a gap h91 by using the piled earthwork 93, wherein a rubber plug is not needed to be arranged on the steel casing 1 because the elevation of the lowest point B of the hole collapse area 92 is lower than or equal to the elevation of the piled earthwork 93, the steel casing 1 is directly lowered to the top of the piled earthwork 93, and the gap h91 is plugged by using the piled earthwork 93 to prevent the replacement concrete from overflowing or falling;
an I-shaped steel beam 81 is arranged at the opening of the pile hole 9, and a lifting rope is fixed on the I-shaped steel beam 81 through a steel rope 82 buckle so as to ensure the stability of the steel pile casing 1.
S2, conveying concrete to the concrete feed port 3 by using a guide pipe or a stringing barrel, wherein the concrete needs to ensure better workability, particularly fluidity, stringing under the self weight of the concrete, and flowing the replacement filling concrete to a gap h91 between the steel casing 1 and the hole wall until the first time of pouring is finished, and replacing the support of the part of the filled collapsed hole region 92.
S3, after the first replacement and filling concrete is poured, maintaining for 5-7 days, and after the first replacement and filling concrete has certain strength, pulling the steel casing 1 out of the pile hole 9 by using hoisting equipment to recover the steel casing 1;
the rotary drilling rig is used for removing redundant replacement concrete and fishing out the stacked earthwork 93 with a preset amount in batches, and it should be noted that the fishing out amount of the stacked earthwork 93 for one time can be set according to actual needs.
S4 repeating steps S1 to S3, and replacing the support once after the earthwork 93 is fished out once until all the earthwork 93 is fished out and the whole collapsed hole area 92 is replaced.
EXAMPLE III
As shown in fig. 4, in the case that the stacking height of the stacked earthwork 93 generated by the collapse of the hole wall is lower than the lowest position of the collapsed hole region 92, that is, the collapsed hole region 92 is located above the stacked earthwork 93, the embodiment provides a collapse hole underpinning construction method for a rotary excavating cast-in-place pile, which uses the collapse hole underpinning device for a rotary excavating cast-in-place pile described in the first embodiment, and the underpinning construction method includes the following steps:
s0, detecting the length of a collapsed hole region 92, determining the length L1 of the steel casing according to the length L2 of the collapsed hole region, and determining the length L1 of the steel casing according to the relation that the length L1 of the steel casing is 1m longer than the length L2 of the collapsed hole region, wherein the difference between L1 and L2 can be more than 1m, and the specific difference is determined by a person skilled in the art according to actual conditions; l1 is larger than L2, so that the positions of the top cover 2 and the centering bracket 4 are higher than the highest point C of the hole collapse area 92, the position of the seam blocking plug 5 is lower than the lowest point D of the hole collapse area 92, and the hole collapse area 92 is located between the centering bracket 4 and the seam blocking plug 5, so that the underpinning integrity and the underpinning centralization are ensured. If the centering support 4 is lower than the highest point C of the collapsed hole area 92, namely the centering support 4 is located in the collapsed hole area 92, due to the irregularity of the collapsed hole area 92, the top of the steel casing 1 can shake, so that underpinning deviation can be caused, and when the later rotary excavating and pore forming construction is carried out, the pile body is deviated due to the asymmetry of the filling concrete, so that the verticality of the pile body is influenced.
After determining the length L1 of the steel casing, the standard casing segment 12 is welded with the initial casing segment 11 as required, and if a part of the standard casing segment 12 needs to be cut to meet the length L1, a person skilled in the art can cut the standard casing segment 12 as required.
S1, adhering a seam-stopping plug 5 to the bottom of the steel casing 1, brushing a release agent on the outer wall of the steel casing 1, tying a lifting rope on a lifting ring 6, lifting the steel casing 1 into a pile hole 9 by using lifting equipment and lowering the steel casing 1 to a hole collapse area 92, lifting the steel casing 1 into the pile hole 9 and lowering the steel casing 1 to the hole collapse area 92, enabling a centering support 4 to be located above the hole collapse area 92, enabling the seam-stopping plug 5 to be located below the hole collapse area 92, and utilizing the seam-stopping plug 355 to block a gap h91 between the steel casing 1 and the wall of the hole; an I-shaped steel beam 81 is arranged at the opening of the pile hole 9, and a lifting rope is fixed on the I-shaped steel beam 81 through a steel rope 82 buckle so as to fix the position of the steel pile casing 1 in the pile hole 9 and ensure the stability of the steel pile casing 1.
S2, conveying concrete to the concrete feed port 3 by using a guide pipe or a stringing bucket, wherein the concrete needs to ensure better workability, particularly fluidity, stringing under the self weight of the concrete, and flowing the replacement filling concrete to a gap h91 between the steel casing 1 and the hole wall until the whole collapsed hole area 92 is fully poured, thereby completing the pouring of the replacement filling concrete. If the compactness of the concrete is ensured, the vibration of the vibrating rod can be used.
And S3, after the concrete is poured, maintaining for 5-7 days, and after the replacement and filling concrete has certain strength, pulling the steel casing 1 out of the pile hole 9 by utilizing hoisting equipment to recover the steel casing 1.
In the embodiment, the underpinning device comprising the steel casing and the centering support 4 is adopted, the steel casing 1 is hung and placed in a hole collapse area 92 in the hole by using a hanging structure, the posture of the steel casing 1 in the hole is modified by using the centering support 4, the center of the steel casing 1 and the center of the pile hole 9 are centered, a gap h91 communicated with the hole collapse area 92 is formed in front of the hole walls of the steel casing 1 and the pile hole 9, replacement and filling concrete is poured into the gap h91, the hole collapse area 92 is filled with the replacement and filling concrete, and after the replacement and filling concrete reaches the preset strength, the steel casing 1 is pulled out of the pile hole 9. Compared with the prior art, this embodiment construction is swift, avoids trading the support district through trading the filled concrete and appears the secondary hole that collapses, can avoid appearing burying the problem of protecting a section of thick bamboo, and the concrete volume of using is few moreover, can reduce the concrete volume of trading and filling, reduces construction cost.
Compared with the conventional slurry retaining wall, steel retaining cylinder 1 and concrete replacement, the collapse hole replacement device and the collapse hole replacement construction method for the rotary excavating cast-in-place pile have the following advantages:
(1) this embodiment has advantages over mud fenders
The mud retaining wall has large filling holes, serious mud loss, poor retaining wall effect, easy repeated hole collapse and easy hole collapse at the same position, so that the construction progress is slow and the construction cost is high.
The underpinning device of the embodiment can ensure a better wall protection effect, and the hole collapse area 92 is stable depending on the strength of concrete, so that the hole collapse phenomenon cannot occur again; in the process of pore-forming again, only a small amount of underpinned concrete needs to be cut, so that the amount of the replacement and filling concrete is reduced, and the economic benefit is increased.
(2) The embodiment has advantages compared with the steel casing 1
In deep filled soil area, if adopt the steel to protect 1 dado, the steel that needs to bury underground protects a 1 length great, in case protect a length too big, the side frictional resistance is great, leads to protecting a removal difficulty, needs to adopt the high-tonnage vibration hammer to extract to there is the risk that protects a buried, protects a once can't extract, the cost that leads to will be difficult to bear. In addition, the pile body concrete is poured, and then the pile casing is pulled upwards, so that space is provided for soil body collapse due to the fact that the concrete is not initially set, soil bodies around the pile collapse into the pile body concrete, and the quality of the pile body is affected.
The underpinning device is formed by modifying a conventional steel casing 1, the processing cost is low, the device is only required to be lowered according to the length of the collapsed hole area 92, and the underpinning device is pulled out after the replacement and filling concrete is solidified, and compared with a full-length casing wall protection mode, the underpinning device is small in pulling-out difficulty, fast in construction and low in cost due to small length; and the condition of embedding the protective cylinder can not occur.
(3) The embodiment has the advantages compared with the concrete replacement
According to the traditional concrete replacement and filling method, concrete is directly injected into the hole, the problem of wall protection can be well solved, secondary hole collapse can not occur in the hole collapse area 92, however, the concrete consumption is large, particularly when the hole collapse area 92 is located in the middle or upper portion of a formed hole, the replacement and filling concrete needs to be replaced and filled from the bottom of the hole to the hole collapse area 92, the concrete consumption is not controllable, and huge cost waste is caused. And, pore-forming once more after changing and filling, the machinery needs to break the partial concrete of pile core once more, because the concrete intensity is high, the machinery breaks the difficulty, and the construction progress is slow.
The underpinning device of the embodiment is based on the improvement optimization of a conventional concrete replacement mode, and through device underpinning, no matter the collapsed hole area 92 is located at any elevation in the hole, the collapse hole area can be replaced in a targeted manner instead of full-length concrete replacement, so that the concrete is prevented from being replaced to the uncollapsed hole section below the elevation of the collapsed hole area 92, and the waste concrete amount is reduced. And this underpinning device passes through steel casing 1 and forms the centre form, can reduce the regional required concrete that trades of pile core greatly, compares traditional trade from the cost angle and fills, has reduced the concrete use amount, and economic benefits is showing. In addition, by adopting the underpinning device, concrete is not poured in the pile core in the collapsed hole area 92, the original pile core with the formed hole can be restored after the underpinning device is pulled out, the hole is formed again, only a small amount of underpinned concrete needs to be cut again for pouring, the cutting difficulty is small, the construction speed is high, and the construction period advantage is good. During the concrete maintenance after underpinning, can carry out the remaining pile foundation pore-forming operation of adjacent region, wait the concrete to possess intensity after, return the follow-up pore-forming operation of this root pile of construction again to form the line construction, can not lead to the time limit for a project extension because of the maintenance time.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Dig bored concrete pile hole collapse underpinning device soon, its characterized in that includes:
a gap h is formed between the outer wall of the steel casing and the wall of the pile hole, a top cover is fixed at one end of the steel casing, a hanging structure is fixed on the top cover, and the top cover is provided with a material guide surface;
the centering support is provided with a plurality of centering supports and is fixed on the outer wall of the steel casing, and the plurality of centering supports are distributed at equal intervals along the circumferential direction of the steel casing.
2. The underpinning device of claim 1, further comprising:
the seam-stopping plug is fixed on the steel casing, and the seam-stopping plug and the top cover are respectively positioned at two ends of the steel casing.
3. Underpinning device according to claim 1,
and the outer wall of the steel casing is provided with a release agent.
4. Underpinning device according to claim 1,
the steel casing comprises a starting casing segment and at least one standard casing segment,
one end of the initial casing section is fixed with the top cover, the other end of the initial casing section is fixed with the standard casing section,
and two adjacent pile casing segments are spliced and fixed.
5. Underpinning device according to claim 1,
the hanging structure is a hanging ring.
6. A collapse hole underpinning construction method of a rotary excavating cast-in-place pile is characterized in that by using the collapse hole underpinning device of the rotary excavating cast-in-place pile according to any one of claims 1 to 5,
the underpinning construction method comprises the following steps:
s1, hanging the steel casing into the pile hole and lowering the steel casing to the collapsed hole area, wherein the bottom of the steel casing is placed at the top of the piled earthwork at the bottom of the hole;
s2, pouring first replacement filling concrete into a gap h between the steel casing and the hole wall;
s3, when the first replacement filling concrete reaches the preset strength, pulling the steel pile casing out of the pile hole, removing the redundant replacement filling concrete and fishing out the preset amount of piled earthwork;
s4 repeats S1 to S3 until all the heaped earthwork is fished out and the entire collapsed area is filled.
7. The underpinning construction method as recited in claim 6,
in step S1, before the steel casing is lowered, a release agent is coated on the outer wall of the steel casing.
8. A collapse hole underpinning construction method of a rotary excavating cast-in-place pile is characterized in that by using the collapse hole underpinning device of the rotary excavating cast-in-place pile according to any one of claims 1 to 5,
the underpinning construction method comprises the following steps:
s1, hanging the steel casing into the pile hole and lowering the steel casing to the hole collapse area, locating the centering bracket above the hole collapse area, locating the seam-stopping plug below the hole collapse area and blocking a gap h between the steel casing and the hole wall;
s2, pouring replacement concrete into the gap h between the steel casing and the hole wall;
s3, when the replacement concrete reaches the preset strength, the steel casing is pulled out of the pile hole.
9. The underpinning construction method as recited in claim 8,
in step S1, before the steel casing is lowered, a release agent is coated on the outer wall of the steel casing.
10. The underpinning construction method as recited in claim 8,
the length of the steel casing is greater than that of the collapsed hole area.
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