CN110725303B - Construction method of oblique stressed body of rigid insert combined with guniting stirring reinforcing body - Google Patents
Construction method of oblique stressed body of rigid insert combined with guniting stirring reinforcing body Download PDFInfo
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- CN110725303B CN110725303B CN201911050641.7A CN201911050641A CN110725303B CN 110725303 B CN110725303 B CN 110725303B CN 201911050641 A CN201911050641 A CN 201911050641A CN 110725303 B CN110725303 B CN 110725303B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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Abstract
The invention discloses a construction method of an oblique stressed body of a rigid insert combined with a guniting stirring reinforcing body, which comprises the following steps: the rigid insert is obliquely inserted into a soil body to a designed top elevation position of the cement soil expanded body; starting a drilling machine to insert a drilling tool provided with a centering device into a cavity of the rigid insert in an inclined manner and drill to the lower end part of the rigid insert; the drill bit of the drilling tool is a variable-diameter drill bit, the variable-diameter drill bit is opened to increase the diameter of the drill bit and continue to drill obliquely, and meanwhile, the variable-diameter drill bit is enabled to spray cement slurry outwards and stir the cement slurry with soil to form a section of cement soil expanded body; contracting the reducing drill bit to reduce the diameter of the reducing drill bit and lifting the reducing drill bit away from the rigid insert; and (3) obliquely sinking the rigid insert into the cement soil expansion body, so that the rigid insert and the cement soil expansion body form a coaxial and integrated oblique stress body. The invention has the advantages that: the cement soil expanding body with uniform size can be formed, the coaxial construction of the rigid insertion piece and the cement soil expanding body is ensured, the concentric forming is carried out, and the coaxial and integrated oblique stress body is formed.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a construction method of an oblique stressed body of a rigid insert combined with a guniting stirring reinforcing body.
Background
The vertical stress body formed by inserting steel lattice columns, steel pipes, profile steel and precast piles (hereinafter referred to as inserts) into a cement soil reinforcement is widely applied to the field of civil engineering;
the construction method comprises the following steps: firstly, constructing a cement soil reinforcing body, and then inserting the insert piece, thereby forming a stress body with certain bearing capacity together;
the second construction method comprises the following steps: after the construction of the insert, the end part of the insert is grouted and reinforced to form a cement soil reinforced body, so that a stress body with certain bearing capacity is formed together;
the third construction method comprises the following steps: and arranging a drill bit at the end part of the insert, and drilling a hole by rotating along the guide frame to form a hole, starting guniting, stirring and drilling the top elevation of the designed cement soil reinforcement body to finish the construction of the cement soil reinforcement body, thereby forming a stress body with certain bearing capacity.
The oblique stress body appears in the engineering, and if the stress body process is directly used, the following problems exist:
the method comprises the following steps: when the oblique cement soil reinforcement body is constructed, the drill bit with larger weight and larger outer diameter than the drill rod has the rigidity gradually reduced along with the drilling depth in the drilling process of disturbing, stirring and reinforcing the undisturbed soil, and the drill bit with smaller outer diameter drives the drill bit to drift downwards under the action of gravity, so that the reinforcement body is easy to deviate from the designed position downwards; in addition, the strength of the grout body in the core area of the cement-soil reinforcement body is high, and the relatively high-rigidity insert body preferentially passes through the weak channel when being inserted into the soft channel, so that the cement-soil reinforcement body inserted into the insert body is difficult to ensure to form an expected stress body, and the design expectation cannot be reached.
The method comprises the following steps: due to the defects of the grouting consolidation construction process, cement paste is easy to run off along a weak channel, the cement soil consolidation quality is difficult to control, a stress body cannot be effectively formed, and the design expectation cannot be met.
The method comprises the following steps: the drilling torque of the drilling machine is limited due to the self weight of the drilling machine, so that the length of the inclined force-bearing body is influenced. In order to ensure that a slurry channel is smooth and meet the working requirement under pressure, the connection of the insertion pieces, the connection between the insertion pieces and a drilling machine and the like are required to be processed and arranged according to the professional requirement, and each insertion piece is required to be provided with a disposable drill bit, so that the cost is greatly increased; the method has complex working procedures and low efficacy during implementation, is easy to further increase the construction cost, and causes serious adverse effects on the applicability of the method.
Disclosure of Invention
The invention aims to provide a construction method of an oblique stressed body of a rigid insert combined with a guniting stirring reinforcement body, which is characterized in that after the rigid insert is inserted into a soil body in advance, a drilling tool is drilled in the rigid insert along the axial direction of the rigid insert, grout is sprayed and the soil body is stirred through reducing diameter to form a cement soil expanded body with uniform size, and the rigid insert and the cement soil expanded body can be coaxial.
The purpose of the invention is realized by the following technical scheme:
a construction method of an oblique stressed body of a rigid insert combined with a guniting stirring reinforcement body is characterized by comprising the following steps: obliquely inserting a rigid insert into a soil body to a designed top elevation position of the cement soil expanded body; starting a drilling machine to obliquely insert a drilling tool provided with a centering device into the cavity of the rigid insert and drill to the lower end part of the rigid insert; the drill bit of the drilling tool is a reducing drill bit, the diameter of the reducing drill bit is increased by opening the reducing drill bit, the drilling is continued to be performed obliquely, and meanwhile, cement slurry is sprayed outwards by the reducing drill bit and is stirred with soil to form a section of cement soil expanded body; retracting the reducing bit to reduce its diameter and lift it off of the rigid insert; and the rigid insert is obliquely sunk into the cement soil expansion body, so that the rigid insert and the cement soil expansion body form a coaxial and integrated oblique stress body.
The rigid insert is formed by connecting a plurality of rigid insert segments, and the method for inserting the rigid insert into the soil body in an inclined mode to the designed top elevation position of the cement soil expanded body comprises the following steps: obliquely sinking a first section of the rigid insert section into the soil body by using a sinking device, then connecting a second section of the rigid insert section to the tail end of the first section of the rigid insert section, and continuously sinking the second section of the rigid insert section by using the sinking device; repeating the steps until the head end of the first section of the rigid insert section reaches the designed top elevation position of the cemented soil expansion body; wherein, the settling device is one or a combination of a drilling settling device, a static pressure settling device and a vibration settling device.
The rigid insert is a hollow rigid body and is one or a combination of a steel lattice column, a steel pipe and a prefabricated hollow pile.
The front end part of the rod body of the drilling tool is the reducing drill bit, the reducing drill bit comprises a drill bit positioned at the front end part of the rod body, a lifting sleeve sleeved above the drill bit and a plurality of reducing blades uniformly distributed on the upper edge part of the drill bit, the lifting sleeve is driven by a hydraulic oil cylinder fixed on the rod body to lift along the rod body, one end of each reducing blade is hinged to the upper edge part of the drill bit, the other end of each reducing blade and a hinged rod arranged between the lower edge parts of the lifting sleeves, and the reducing blades are driven by the lifting sleeve to shrink inwards or expand outwards so as to change the diameter of the reducing drill bit.
And a grouting pipeline is arranged in a rod body of the drilling tool and extends into the reducing drill bit, and a plurality of grout spraying ports communicated with the grouting pipeline are uniformly distributed on the reducing drill bit.
And a plurality of centering devices are arranged on the rod body of the drilling tool at intervals, and the drilling tool always keeps coaxial drilling with the central axis of the rigid insert under the guidance of the centering devices.
The centering device comprises a base plate, a rotating device fixed on the base plate and guide wheel sets uniformly distributed on the outer edge of the base plate, a rod body of the drilling tool penetrates through the rotating device and through holes in the base plate, and the guide wheel sets are attached to the inner wall surface of the rigid insertion piece and can move along the axial direction of the rigid insertion piece.
The guide wheel set comprises a supporting rod and a pulley block, the supporting rod and the pulley block extend outwards from the base plate, an n-shaped mounting frame is arranged at the outer end part of the supporting rod, adjustable long holes are formed in the outer end part of the supporting rod and side plates on two sides of the supporting rod respectively, two ends of a supporting shaft of the pulley block are installed in the adjustable long holes in the side plates respectively, a spring is arranged between the pulley block and the end plates, and the guide wheel set can adapt to the rigid insertion pieces with different inner diameters through self-adaptive adjustment of the spring.
The insertion depth of the rigid insert in the cemented soil expansion body is not less than 1 m.
The invention has the advantages that: the drilling tool obliquely drills into the guniting along the central position of the rigid insertion piece and is stirred and reinforced to form the cement soil expansion body with uniform size, so that the coaxial construction and concentric forming of the drilling tool and the cement soil expansion body are ensured, and the corresponding mechanism can be arranged on the outer side of the rigid insertion piece as required, so that the drilling tool is further reinforced to form effective stable connection with the cement soil expansion body, and an integrated structure for improving the bearing capacity is achieved.
Drawings
FIG. 1 is a schematic illustration of the insertion of a rigid insert into a body of earth in accordance with the present invention;
FIG. 2 is a schematic view of a drilling tool drilling down under the guidance of a rigid insert and reducing injection to form a cemented soil expansion body according to the present invention;
FIG. 3 is a schematic view of the rigid insert and the soil cement expansion body forming an oblique force-bearing body according to the present invention;
FIG. 4 is a schematic view of the centering device of the present invention mounted on the drill rod;
FIG. 5 is an enlarged partial view A of FIG. 4 according to the present invention;
FIG. 6 is a schematic structural diagram of a variable diameter drill bit according to the present invention;
FIG. 7 is a schematic view of an oblique force-bearing body as a pull anchor structure applied to a building envelope according to the present invention;
FIG. 8 is a schematic view of the oblique force-bearing body as a support structure applied to the enclosure construction in the present invention;
FIG. 9 is a schematic view of the oblique force-bearing body as a pull anchor structure and a support structure applied to a building envelope in the present invention;
FIG. 10 is a schematic view of an oblique force-bearing body as a pull anchor structure applied to slope enclosing engineering according to the present invention;
FIG. 11 is a schematic view of an oblique force-bearing body as a support structure applied to slope enclosing engineering according to the present invention;
fig. 12 is a schematic view of the oblique force-bearing body of the present invention applied to a slope protection project as a pull anchor structure and a support structure.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
as shown in fig. 1-12, reference numerals 1-26 are: the device comprises a rigid insert 1, a cement soil expanding body 2, a rod body 3, a centering device 4, a drilling tool 5, a rotating device 6, a base plate 7, a support rod 8, an installation frame 9, a pulley block 10, a support shaft 11, a spring 12, an adjustable long hole 13, a reducing drill bit 14, a lifting sleeve 15, a hinge rod 16, a reducing blade 17, a drill bit 18, a grouting pipeline 19, a grouting opening 20, a structure 21, a building enclosure 22, a ring beam 23, a side slope 24, a slope protection body 25 and a ring beam 26.
Example 1: as shown in fig. 1 to 6, this embodiment specifically relates to a construction method of an oblique stressed body with a rigid insert combined with a guniting stirring reinforcement body, which can be applied to an oblique supporting structure in foundation pit engineering or an oblique supporting structure in slope protection engineering, and the construction method includes the following steps:
(1) as shown in fig. 1, a rigid insert 1 is obliquely inserted into a soil body at a designed construction position until reaching a designed top elevation position of a cemented soil expansion body 2, wherein the rigid insert 1 is formed by connecting a plurality of rigid insert segments, the rigid insert segments are of a hollow structure, any one or more combinations of hollow rigid bodies such as steel lattice columns, steel pipes, prefabricated hollow piles and the like can be adopted, and the specific construction method comprises the following steps:
firstly, erecting an oblique guide support (arranged according to circumstances) on the ground according to a preset position, obliquely sinking a first section of rigid insert segment into a soil body by using a sinking device, then connecting a second section of rigid insert segment at the tail end of the first section of rigid insert segment, continuously sinking the second section of rigid insert segment and a first section of rigid insert segment connected with the second section of rigid insert segment into the soil body by using the sinking device, then connecting a third section of rigid insert segment … …, and repeating the steps until the head end of the first section of rigid insert segment reaches the designed top elevation position of the cemented soil expansion body 2; it should be noted that the sinking method used in the present embodiment may be one or a combination of drilling method, static pressure method and vibration method.
(2) As shown in fig. 2, after completing the insertion of the rigid insert 1, the drilling machine is started, the drilling tool 5 provided with the centering device 4 is obliquely inserted into the cavity of the rigid insert 1 and drilled to the lower end position thereof, the front end part of the rod body 3 of the drilling tool 5 is a reducing bit 14, after the reducing drill bit 14 reaches a position below the lower end part of the rigid insert 1, the reducing drill bit 14 is opened to increase the diameter of the reducing drill bit and continues to drill obliquely until the designed bottom elevation of the cement soil expansion body 2, after the diameter of the reducing drill bit 14 is enlarged, the grouting pipeline 19 in the rod body 3 is opened simultaneously for grouting, cement grout is sprayed outwards through a plurality of grout spraying ports 20 on the outer edge part of the rod body to be stirred with soil body to form a section of cement soil enlarged body 2 with uniform size, under the guidance of the rigid insert 1 and the centering device 4, the soil cement expanding body 2 and the rigid insert 1 have the same central axis; the main cementing material of the cement soil expansion body 2 is cement, and can also be other cementing materials such as GS-soil hardening agent.
As shown in fig. 2, 4 and 5, a plurality of centering devices 4 are distributed on a rod body 3 of a drilling tool 5 at intervals, the centering devices 4 are mainly used for ensuring that the rod body 3 is always kept on the same axis with a rigid insert 1 in the drilling process to prevent deviation, each centering device 4 mainly comprises a base disc 7, a rotating device 6 and guide wheel sets uniformly distributed on the outer edge part of the base disc 7, the rotating device 6 is fixedly arranged on the base disc 7, a through hole corresponding to the rotating device 6 is formed in the base disc 7, the rod body 3 of the drilling tool 5 penetrates through the rotating device 6 and the through hole in the base disc 7, and the rotating device 6 can rotate at a high speed along with the rod body; in this embodiment, four guiding wheel sets are disposed at intervals on the outer edge of the base plate 7, each guiding wheel set includes a supporting rod 8 extending outward from the base plate 7, a mounting bracket 9 is fixed on the outer end of the supporting rod 8, the mounting bracket 9 is in an n shape, and has an end plate and two side plates, the end plate is fixed on the outer end of the supporting rod 8, the side plates on both sides are provided with adjustable long holes 13, a pulley block 10 is arranged in the mounting frame 9, the two ends of a supporting shaft 11 of the pulley block 10 are arranged in adjustable long holes 13, and simultaneously, between the end plates of the mounting frame 9 and the pulley block 10, springs 12 are arranged, so that the pulley block 10 can accommodate rigid inserts 1 of different inner diameters, under the compensation action of the spring 12, the support shaft 11 of the pulley block 10 can perform radial movement adjustment in the adjustable long hole 13, so as to ensure that the pulley block 10 can always cling to the inner wall of the rigid insertion piece 1 for guiding;
as shown in fig. 6, the reducing drill 14 mainly includes a drill 18 located at the front end of the rod 3, a lifting sleeve 15 is sleeved on the rod 3 and above the drill 18, meanwhile, a plurality of reducing blades 17 are uniformly distributed on the upper edge of the drill 18, one end of each reducing blade 17 is hinged to the upper edge of the drill 18, and the other end of each reducing blade 17 is hinged to the lifting sleeve 16, wherein a hydraulic cylinder is fixed on the rod 3 and used for driving the lifting sleeve 15 to lift along the extending direction of the rod 3, and the reducing blades 17 can be retracted inwards or expanded outwards along with the lifting sleeve 15 to change the diameter of the reducing drill 14.
(3) As shown in fig. 2 and 3, after the construction of the cemented soil expansion body 2 is completed, the diameter of the reducing bit 14 is reset to the minimum, and then the rod body 4 of the drilling tool 5 is lifted away from the cemented soil expansion body 2 and the rigid insert 1; and then continuing to obliquely sink the rigid insert 1 into the cement soil expansion body 2 at an existing inclination angle by using the sinking device in the step 1, so that the rigid insert 1 and the cement soil expansion body 2 form an obliquely stressed body which is coaxially integrated, wherein in order to ensure that the rigid insert 1 and the cement soil expansion body 2 can form a stable connection structure, the rigid insert 1 should be sunk to a depth of at least 1m in the cement soil expansion body 2.
In order to further improve the bearing capacity of the oblique force-bearing body, a plurality of soil cement expansion bodies 2 are repeatedly constructed according to the method in the above steps, and the rigid insertion member 1 and each soil cement expansion body 2 are coaxially connected to form the oblique force-bearing body in a shape of a sugarcoated haw or a whole body.
The beneficial effect of this embodiment lies in: the inclined stressed body is coaxially constructed, concentrically formed, integrated and coordinated to play a role, the advantages of the rigid insert and the cement soil expansion body are well utilized, the cement soil expansion body is used for replacing a conventional cementing material (cement paste, cement mortar body or concrete and the like) solidification body, the good bearing capacity of the cement soil reinforcement body is fully played, the use amount of the cementing material and the insert is reduced, the quality is reliable, and the inclined stressed body can meet the design expectation; meanwhile, the construction process and working procedures are simplified, and the construction efficiency is improved; greatly saves resources, reduces environmental pollution and further realizes the idea of green construction.
Example 2: as shown in fig. 7, the present embodiment specifically relates to the application of the oblique stressed body construction method in embodiment 1 to the enclosure engineering, and specifically includes the following steps:
(1) constructing a cemented soil expanded body 2 in a soil body outside a foundation pit by using the construction method of the oblique stressed body in the embodiment 1, and coaxially connecting the rigid insert 1 with the cemented soil expanded body 2 to form the oblique stressed body;
(2) the upper ends of the rigid inserts 1 are connected through the ring beam 23, so that the inclined stressed body can be connected with the whole building envelope 22, the inclined stressed body plays a role in pulling and anchoring the building envelope 22, and the building envelope 22 is prevented from inclining inwards to influence the safety of the structure 21.
Example 3: as shown in fig. 8, the present embodiment specifically relates to the application of the oblique stressed body construction method in embodiment 1 to the enclosure engineering, and specifically includes the following steps:
(1) constructing a cemented soil expanded body 2 in a soil body at the bottom of a foundation pit by using the construction method of the oblique stressed body in the embodiment 1, and coaxially connecting a rigid insert 1 with the cemented soil expanded body 2 to form the oblique stressed body;
(2) the upper ends of the rigid inserts 1 are then connected by the ring beam 23, so that the inclined stressed body can be connected with the whole building envelope 22, the inclined stressed body can support the building envelope 22, and the building envelope 22 is prevented from being inclined inwards to affect the safety of the structure 21.
Example 4: as shown in fig. 9, the present embodiment specifically relates to the application of the oblique stressed body construction method in embodiment 1 to the enclosure engineering, and specifically includes the following steps:
(1) in the soil outside the foundation pit, the construction method of the oblique stress body in the embodiment 1 is utilized to construct the cement soil expanded body 2, and the rigid insert 1 is coaxially connected with the cement soil expanded body 2 to form the oblique stress body; the upper end of the rigid insert 1 of the inclined stressed body is connected with the ring beam 23, so that the inclined stressed body positioned outside the foundation pit can be connected with the whole enclosure structure 22, the inclined stressed body plays a role in pulling and anchoring the enclosure structure 22, and the enclosure structure 22 is prevented from inclining inwards to influence the safety of the structure 21;
(2) in the soil body at the bottom of a foundation pit, a cement soil expanded body 2 is constructed by the construction method of the oblique stressed body in the embodiment 1, and the rigid insert 1 is coaxially connected with the cement soil expanded body 2 to form the oblique stressed body; the upper end of the rigid insert 1 of the inclined stressed body is connected with the ring beam 23, so that the inclined stressed body positioned in the soil body at the bottom of the inner side of the foundation pit can be connected with the whole enclosure structure 22, the inclined stressed body plays a supporting role on the enclosure structure 22, and the enclosure structure 22 is prevented from inclining inwards to influence the safety of the structure 21.
Example 5: as shown in fig. 10, the embodiment specifically relates to the application of the oblique stressed body construction method in embodiment 1 to the slope enclosure engineering, and specifically includes the following steps:
(1) constructing a cement soil expanded body 2 in a side slope 24 by using the construction method of the oblique stressed body in the embodiment 1, and coaxially connecting the rigid insert 1 with the cement soil expanded body 2 to form the oblique stressed body;
(2) then the ring beam 26 is connected with the upper end of the rigid insert 1, so that the whole inclined force bearing body can be connected with the whole slope protection body 25, and the inclined force bearing body plays a role in pulling and anchoring the slope protection body 25 and prevents the slope protection body 25 from inclining inwards to cause a landslide accident.
Example 6: as shown in fig. 11, the embodiment specifically relates to the application of the oblique stressed body construction method in embodiment 1 to the slope enclosure engineering, and specifically includes the following steps:
(1) constructing a cement soil expanded body 2 in a soil body outside a side slope 24 by using the construction method of the oblique stressed body in the embodiment 1, and coaxially connecting the rigid insert 1 with the cement soil expanded body 2 to form the oblique stressed body;
(2) and then the ring beam 26 is connected with the upper end of the rigid insert 1, so that the whole inclined stress body can be connected with the whole slope protection body 25, and the inclined stress body plays a supporting role for the slope protection body 25 and prevents the slope protection body 25 from inclining inwards to cause a landslide accident.
Example 7: as shown in fig. 12, the embodiment specifically relates to the application of the oblique stressed body construction method in embodiment 1 to the slope enclosure engineering, and specifically includes the following steps:
(1) on the side slope 24, the cement soil expanded body 2 is constructed by the construction method of the oblique stress body in the embodiment 1, and the rigid insert 1 is coaxially connected with the cement soil expanded body 2 to form the oblique stress body; then the ring beam 26 is connected with the upper end of the rigid insertion piece 1 on the inclined stress body, so that the inclined stress body can be connected with the whole slope protection body 25, and the inclined stress body plays a role in pulling and anchoring the slope protection body 25 to prevent the slope protection body 25 from inclining inwards to cause a landslide accident;
(2) on the ground soil outside the side slope 24, the construction method of the oblique stress body in the embodiment 1 is utilized to construct the cement soil expanded body 2, and the rigid insert 1 is coaxially connected with the cement soil expanded body 2 to form the oblique stress body; then the ring beam 26 is connected with the upper end of the rigid insertion piece 1 of the inclined stress body, so that the whole inclined stress body can be connected with the whole slope protection body 25, and the inclined stress body plays a supporting role for the slope protection body 25 and prevents the slope protection body 25 from sliding due to inward inclination.
In the above case, the building envelope 22 and the slope protection body 25 may be arranged in different manners such as a door frame type.
Claims (6)
1. A construction method of an oblique stressed body of a rigid insert combined with a guniting stirring reinforcement body is characterized by comprising the following steps: obliquely inserting a rigid insert into a soil body to a designed top elevation position of the cement soil expanded body; starting a drilling machine to obliquely insert a drilling tool provided with a centering device into the cavity of the rigid insert and drill to the lower end part of the rigid insert; the drill bit of the drilling tool is a reducing drill bit, the diameter of the reducing drill bit is increased by opening the reducing drill bit, the drilling is continued to be performed obliquely, and meanwhile, cement slurry is sprayed outwards by the reducing drill bit and is stirred with soil to form a section of cement soil expanded body; retracting the reducing bit to reduce its diameter and lift it off of the rigid insert; obliquely sinking the rigid insert into the cement soil expansion body to form a coaxial and integrated oblique stress body by the rigid insert and the cement soil expansion body;
a plurality of centering devices are arranged on a rod body of the drilling tool at intervals, and the drilling tool always keeps coaxial drilling with the central axis of the rigid insert under the guidance of the centering devices; the centering device comprises a base plate, a rotating device fixed on the base plate and guide wheel sets uniformly distributed on the outer edge of the base plate, a rod body of the drilling tool penetrates through the rotating device and through holes in the base plate, and the guide wheel sets are attached to the inner wall surface of the rigid insertion piece and can move along the axial direction of the rigid insertion piece; the guide wheel set comprises a supporting rod and a pulley block, the supporting rod and the pulley block extend outwards from the base plate, an n-shaped mounting frame is arranged at the outer end part of the supporting rod, adjustable long holes are formed in the outer end part of the supporting rod and side plates on two sides of the supporting rod respectively, two ends of a supporting shaft of the pulley block are installed in the adjustable long holes in the side plates respectively, a spring is arranged between the pulley block and the end plates, and the guide wheel set can adapt to the rigid insertion pieces with different inner diameters through self-adaptive adjustment of the spring.
2. The method for constructing a diagonal force-bearing body by combining a rigid insert and a guniting mixing reinforcement body according to claim 1, wherein the rigid insert is formed by connecting a plurality of rigid insert segments, and the method for inserting the rigid insert into the soil body in an inclined manner to the designed top elevation position of the cement soil expanded body comprises the following steps: obliquely sinking a first section of the rigid insert section into the soil body by using a sinking device, then connecting a second section of the rigid insert section to the tail end of the first section of the rigid insert section, and continuously sinking the second section of the rigid insert section by using the sinking device; repeating the steps until the head end of the first section of the rigid insert section reaches the designed top elevation position of the cemented soil expansion body; wherein, the settling device is one or a combination of a drilling settling device, a static pressure settling device and a vibration settling device.
3. The method for constructing an oblique stressed body by combining a rigid insert and a guniting stirring reinforcement body according to claim 1, wherein the rigid insert is a hollow rigid body and is one or more combinations of steel lattice columns, steel pipes and prefabricated hollow piles.
4. The construction method of the oblique stressed body of the rigid insert combined with the guniting stirring reinforcement body according to claim 1, wherein the front end of a rod body of the drilling tool is the reducing drill bit, the reducing drill bit comprises a drill bit positioned at the front end of the rod body, a lifting sleeve sleeved on the rod body above the drill bit and a plurality of reducing blades uniformly distributed on the upper edge of the drill bit, the lifting sleeve is driven to lift along the rod body by a hydraulic oil cylinder fixed on the rod body, one end of each reducing blade is hinged to the upper edge of the drill bit, a hinged rod is arranged between the other end of each reducing blade and the lower edge of the lifting sleeve, and the reducing blades are driven to contract inwards or expand outwards by the lifting sleeve so as to change the diameter of the reducing drill bit.
5. The construction method of the oblique stressed body with the rigid insert combined with the guniting stirring reinforcement body as claimed in claim 1, wherein a grouting pipeline is arranged in a rod body of the drilling tool and extends into the reducing drill bit, and a plurality of guniting ports communicated with the grouting pipeline are uniformly distributed on the reducing drill bit.
6. The method as claimed in claim 1, wherein the rigid insert is inserted into the cement-soil enlarged body to a depth of not less than 1 m.
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| CN113107370B (en) * | 2021-04-13 | 2022-09-20 | 山东建勘集团有限公司 | Drilling tool for cement-soil mixing pile between rigid piles and using method thereof |
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