阅读说明：本技术 一种刃脚管节支护结构及其纠偏支护方法 (Supporting structure and deviation-correcting supporting method for blade leg pipe joint ) 是由 赵飞 肖威 杨聚辉 吕旦 肖晶娜 周倩 徐光亿 付玉龙 于 2020-07-02 设计创作，主要内容包括：本发明公开了一种刃脚管节支护结构及其纠偏支护方法,解决了现有技术中沉井井筒支护过程中易偏斜,不易纠正的问题。本发明刃脚管节,包括分块式环套,分体式环套上设有纠偏机构,纠偏机构沿周向设置在分块式环套上,分体式环套下部的内壁上设有刃脚。本发明采用具有纠偏机构的刃脚管片,对施工过程的井筒进行及时、准确纠偏,使井筒支护具备切削土体和辅助纠偏双功能,可靠的纠偏能满足下沉过程的及时修正井筒姿态,保证垂直度要求,提高施工质量和效率。(The invention discloses a supporting structure of a blade leg pipe joint and a deviation rectifying supporting method thereof, which solve the problems of easy deflection and difficult correction in the supporting process of an open caisson shaft in the prior art. The invention relates to a cutting edge pipe joint which comprises a segmented ring sleeve, wherein a deviation correcting mechanism is arranged on the segmented ring sleeve along the circumferential direction, and cutting edges are arranged on the inner wall of the lower part of the segmented ring sleeve. The invention adopts the blade leg duct piece with the deviation rectifying mechanism to timely and accurately rectify the deviation of the shaft in the construction process, so that the shaft support has the double functions of cutting soil and assisting in rectifying the deviation, the reliable deviation rectification can meet the requirement of timely rectifying the shaft posture in the sinking process, the verticality requirement is ensured, and the construction quality and efficiency are improved.)

1. A kind of cutting edge tube coupling, characterized by: the device comprises a segmented ring sleeve (1), wherein a deviation correcting mechanism (2) is arranged on the segmented ring sleeve (1), the deviation correcting mechanism (2) is arranged on the segmented ring sleeve (1) along the circumferential direction, and a cutting edge (3) is arranged on the inner wall of the lower part of the segmented ring sleeve (1).

2. The blade leg tube segment of claim 1, wherein: the deviation rectifying mechanism (2) comprises a radial telescopic piece (201), a boot plate (202) is arranged at the telescopic end of the radial telescopic piece (201), and the boot plate (202) extends out of the segmented ring sleeve (1) in the extending state of the radial telescopic piece (201).

3. A blade leg tube segment as claimed in claim 2, wherein: a sealing element is arranged between the boot plate (202) and the segmented ring sleeve (1); the radial telescopic piece (201) is a deviation-rectifying oil cylinder which is fixed on a flange plate (203) inside the segmented ring sleeve (1).

4. A blade leg tube section according to claims 1 to 3, wherein: the segmented ring sleeve (1) comprises at least one axial ring sleeve (10), each axial ring sleeve (10) comprises a side segment (1-1) and a middle segment (1-2), and the side segments (1-1) and the middle segments (1-2) are detachably spliced into an annular sleeve.

5. The blade leg tube segment of claim 4, wherein: the side blocks (1-1) and the middle blocks (1-2) are arc-shaped ring blocks, the radian of the outer arc surface of each side block (1-1) is greater than that of the inner arc surface of each side block (1-1), and the radian of the outer arc surface of each middle block (1-2) is equal to or less than that of the inner arc surface of each middle block (1-2).

6. The blade leg tube segment of claim 5, wherein: the side blocks (1-1) comprise at least one splicing block, and every two adjacent splicing blocks are connected in the radial direction.

7. The utility model provides a sword foot tube coupling supporting construction which characterized in that: comprises a standard annular pipe section (4) and a cutting edge pipe section according to any one of claims 1-3, 5 and 6.

8. The blade foot tube section supporting structure of claim 7, wherein: the sectional type ring sleeve (1) of the blade leg pipe joint comprises three axial ring sleeves (10), a steel sleeve (5) is arranged on the outer wall of the axial ring sleeve (10) positioned at the lowest end, and a sealing ring sleeve (6) is arranged on the steel sleeve (5); the height of the steel sleeve (5) is greater than the height of a single axial ring sleeve (10).

9. The blade foot tube section supporting structure of claim 8, wherein: the sealing ring sleeve (6) comprises a pressing plate (601) and a sealing ring (602) which are arranged on the steel sleeve (5), the lower part of the sealing ring (602) is inserted between the pressing plate (601) and the steel sleeve (5), and the pressing plate (601) fixes the sealing ring (602) on the steel sleeve (5) through a bolt (603).

10. A method for supporting and correcting the deviation of a supporting structure of a blade foot pipe joint according to claim 9, which is characterized in that: the method comprises the following steps:

s1: the cutting edge foot pipe section is connected to the standard annular pipe section (4), the cutting edge foot pipe section and the standard annular pipe section (4) are arranged coaxially, and the outer wall of the cutting edge foot pipe section is connected with a steel sleeve (5);

s2: a tunneling device (7) in the vertical shaft tunnels downwards, and standard annular pipe joints (4) are sequentially spliced and labeled to form a shaft;

s3: when the shaft is inclined, the corresponding deviation rectifying mechanism (2) on the blade leg pipe joint acts on the soil body on the side wall of the vertical shaft to provide a horizontal action required by deviation rectification and rectify the assembly pose of the standard annular pipe joint (4);

s4: in the downward tunneling process of the tunneling device (7), the multiple groups of deviation rectifying mechanisms (2) are controlled to act synergistically according to the condition of the excavated stratum, so that the shaft and the tunneling device (7) are stabilized;

s5: repeating the steps S2-S4 until the construction of the vertical shaft reaches the designed elevation;

s6: dismantling the blade leg pipe joint according to the requirement;

s7: and (4) continuously constructing the shaft downwards until the whole shaft supporting construction is completed.

11. The deviation rectifying support method of a supporting structure of a blade foot pipe joint according to claim 10, characterized in that: the specific steps of step S6 are as follows:

s6.1: removing the middle sub-block (1-2) of the axial ring sleeve (10) at the lower part, and then removing the side sub-block (1-1) of the axial ring sleeve (10) at the lower part;

s6.2: the steel sleeve (5) is kept still, and the shaft is driven to descend at a constant speed by a lifting device of the tunneling device (7) until an axial ring sleeve (10) positioned in the middle contacts the bottom of the steel sleeve (5);

s6.3: sequentially removing the middle sub-block (1-2) and the side sub-block (1-1) of the axial ring sleeve (10) positioned in the middle;

s6.4: the steel sleeve (5) is kept still, and the shaft is driven to descend at a constant speed by a lifting device of the tunneling device (7) until an axial ring sleeve (10) at the upper part contacts the bottom of the steel sleeve (5);

s6.5: and sequentially dismantling the middle sub-block (1-2) and the side sub-block (1-1) of the axial ring sleeve (10) positioned at the upper part to complete the total dismantling of the blade foot pipe joint.

Technical Field

The invention relates to the technical field of open caisson construction, in particular to a supporting structure of a blade foot pipe joint and a deviation rectifying supporting method thereof.

Background

The open caisson is used as a structure for underground space structures or high-rise building deep foundations or deep foundation pit supporting construction, and has wide engineering application conditions and application range. The traditional open caisson construction adopts manual or mechanical excavation of a central area and soil cutting and sinking by means of a blade foot.

Generally speaking, the sinking verticality of a traditional open caisson depends on the uniformity of soil taking around a cutting edge and the geological condition, and when the open caisson deflects, a mode of non-uniform soil taking at the bottom of the open caisson is adopted for passive deviation correction, or a jack is adopted for auxiliary correction at the wellhead. The deviation rectifying mode is single, and the method is not suitable for open caisson construction engineering with higher verticality requirement. And during construction, although the shaft lifting equipment is arranged, the shaft can be ensured to sink at a uniform speed to a certain extent, and the phenomenon of sink suddenly is not easy to occur, but the sink process can be subjected to the phenomena of unstable stratum, overweight of a heading machine or uneven excavation and the like, the risk of shaft deflection still exists, the sink precision is still difficult to control accurately, and the deviation of the tail end of the shaft can be corrected only by the lifting equipment when the shaft deflection occurs, so that the construction efficiency is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a blade leg pipe joint supporting structure and a deviation correcting supporting method thereof, and solves the problems that the sinking well shaft supporting process in the prior art is easy to deflect and is difficult to correct.

The technical scheme of the invention is realized as follows: a cutting edge pipe joint comprises a segmented ring sleeve, wherein a deviation correcting mechanism is arranged on the segmented ring sleeve along the circumferential direction, and cutting edges are arranged on the inner wall of the lower portion of the segmented ring sleeve.

The correcting mechanism comprises a radial telescopic piece, a boot plate is arranged at the telescopic end of the radial telescopic piece, and the boot plate extends out of the segmented ring sleeve when the radial telescopic piece extends out.

A sealing element is arranged between the boot plate and the segmented ring sleeve; the radial telescopic piece is a deviation-correcting oil cylinder which is fixed on a flange plate inside the segmented ring sleeve.

The segmented ring sleeves comprise at least one axial ring sleeve, each axial ring sleeve comprises a side segment and a middle segment, and the side segments and the middle segments can be detachably spliced to form an annular sleeve.

The side blocks and the middle blocks are arc-shaped ring blocks, the radian of the outer arc surfaces of the side blocks is larger than that of the inner arc surfaces of the side blocks, and the radian of the outer arc surfaces of the middle blocks is equal to or smaller than that of the inner arc surfaces of the middle blocks. The side blocks are connected in the radial direction, and the middle block is connected with the adjacent side blocks in the straight direction.

The side blocks comprise at least one splicing block, and every two adjacent splicing blocks are connected in the radial direction.

A supporting structure for a cutting edge foot pipe joint comprises a standard annular pipe joint and the cutting edge foot pipe joint.

The sectional type ring sleeve of the blade leg pipe joint comprises three axial ring sleeves, a steel sleeve is arranged on the outer wall of the axial ring sleeve positioned at the lowermost end, and a sealing ring sleeve is arranged on the steel sleeve; the height of the steel sleeve is greater than the height of a single axial ring sleeve.

The sealing ring sleeve comprises a pressing plate and a sealing ring which are arranged on the steel sleeve, the lower part of the sealing ring is inserted between the pressing plate and the steel sleeve, and the pressing plate fixes the sealing ring on the steel sleeve through a bolt.

A deviation-rectifying supporting method of the blade foot pipe joint supporting structure comprises the following steps:

s1: the cutting edge pipe joint is connected to the standard annular pipe joint, the coaxial arrangement of the cutting edge pipe joint and the standard annular pipe joint is ensured, and the outer wall of the cutting edge pipe joint is connected with a steel sleeve;

s2: a tunneling device in the vertical shaft tunnels downwards, and standard annular pipe joints are sequentially spliced and labeled to form a shaft;

s3: when the shaft is inclined, the corresponding deviation rectifying mechanism on the blade leg pipe joint acts on the soil body on the side wall of the vertical shaft to provide a horizontal action required by deviation rectification and correct the assembly pose of the standard annular pipe joint;

s4: in the downward tunneling process of the tunneling device, the multiple groups of deviation rectifying mechanisms are controlled to act synergistically according to the condition of the excavated stratum, so that the shaft and the tunneling device are stabilized;

s5: repeating the steps S2-S4 until the construction of the vertical shaft reaches the designed elevation;

s6: dismantling the blade leg pipe joint according to the requirement;

s7: and (4) continuously constructing the shaft downwards until the whole shaft supporting construction is completed.

The specific steps of step S6 are as follows:

s6.1: removing the middle blocks of the axial ring sleeve at the lower part, and then removing the side blocks of the axial ring sleeve at the lower part;

s6.2: the steel sleeve is kept still, and the shaft is driven to descend at a constant speed by a lifting device of the tunneling device until an axial ring sleeve positioned in the middle part contacts the bottom of the steel sleeve;

s6.3: sequentially removing the middle sub-block and the side sub-block of the axial ring sleeve positioned in the middle;

s6.4: the steel sleeve is kept still, and the shaft is driven to descend at a constant speed by a lifting device of the tunneling device until an axial ring sleeve positioned at the upper part contacts the bottom of the steel sleeve;

s6.5: and sequentially removing the middle block and the side block of the axial ring sleeve positioned at the upper part to finish the complete removal of the blade leg pipe joint.

The invention adopts the blade leg duct piece with the deviation rectifying mechanism to timely and accurately rectify the deviation of the shaft in the construction process, so that the shaft support has the double functions of cutting soil and assisting in rectifying the deviation, the reliable deviation rectification can meet the requirement of timely rectifying the shaft posture in the sinking process, the verticality requirement is ensured, and the construction quality and efficiency are improved. The cutting edge tube piece adopts axial ring division and radial block division, optimizes the traditional form of the cutting edge tube section, reduces waste and can be repeatedly utilized, promotes the multi-point operation work efficiency, and saves the construction cost. The method has the advantages of low cost, high precision, simple operation and reusability, and the construction method is safe and efficient, thereby greatly improving the construction efficiency.

Drawings

In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.

Fig. 1 is a schematic structural view of a cutting edge pipe joint of the invention.

Fig. 2 is a view from a-a in fig. 1.

Fig. 3 is a partially enlarged view of fig. 1 at B.

Fig. 4 is a schematic diagram of a supporting structure of the blade foot pipe joint.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1, embodiment 1 is a blade leg pipe joint, which includes a segmented ring sleeve 1, wherein the segmented ring sleeve 1 can be axially multi-ring spliced and is a same-ring segmented splicing. The block type ring sleeve 1 is provided with a deviation rectifying mechanism 2, the deviation rectifying mechanism 2 is arranged on the block type ring sleeve 1 along the circumferential direction, the number of the deviation rectifying mechanisms is arranged according to the requirement, the deviation is rectified in the radial direction, and the inner wall of the lower part of the block type ring sleeve 1 is provided with a blade foot 3. The inclination of the cutting edge is selected according to stratum or construction working condition, the design of the cutting edge improves the soil-entering efficiency, and the sectional type ring sleeve has the double functions of cutting soil and assisting in deviation correction. The cutting edge pipe joint is not only used for construction of an open caisson construction method, but also can be used in construction of a vertical shaft or similar engineering according to the requirements of functions.

Further, as shown in fig. 2, the deviation correcting mechanism 2 includes a radial telescopic member 201, the radial telescopic member 201 is a deviation correcting cylinder, and the deviation correcting cylinder is fixed on a flange plate 203 inside the segmented ring sleeve 1 through a bolt and can be radially extended and retracted. The telescopic end of the radial telescopic member 201 is provided with a shoe plate 202, and the shoe plate 202 extends out of the sectional type ring sleeve 1 when the radial telescopic member 201 extends out. And a sealing element is arranged between the boot plate 202 and the segmented ring sleeve 1, so that the sealing property in the telescopic process is kept. The size of the shoe plate is related to the pressure bearing capacity of the stratum, and corresponding matching design needs to be carried out according to the specific stratum. When the deviation rectifying oil cylinder works, the deviation rectifying oil cylinder extends out to drive the shoe plate to extend out and support on the soil body on the side surface, so that the lateral force required by deviation rectification of the shaft is provided. When in action, a plurality of groups of boot plates can act simultaneously to reduce the contact specific pressure. The reliable deviation rectification can meet the requirement of timely correcting the shaft posture in the sinking process and ensuring the verticality. The deviation rectifying mechanism is not limited to the above form, and can be properly adjusted according to the existing materials to meet the stress requirement.

Further, the segmented ring sleeve 1 comprises at least one axial ring sleeve 10, one or two or more axial ring sleeves can be arranged according to needs, and two adjacent axial ring sleeves are connected through bolts to form a complete ring sleeve. Each axial ring sleeve 10 comprises a side block 1-1 and a middle block 1-2, and the side block 1-1 and the middle block 1-2 are detachably spliced into an annular sleeve. The middle block adopts a special design to realize rapid disassembly and assembly in the hole.

Preferably, the side blocks 1-1 and the middle blocks 1-2 are arc-shaped ring blocks, the radian of the outer arc surface of the side block 1-1 is greater than that of the inner arc surface of the side block 1-1, and the radian of the outer arc surface of the middle block 1-2 is equal to or less than that of the inner arc surface of the middle block 1-2. When the radian of the outer cambered surface of the middle block 1-2 is equal to the radian of the inner cambered surface of the middle block 1-2, the middle block 1-2 is connected with the adjacent side block 1-1 in the straight direction, and the side joint surfaces are kept parallel to each other. Or when the radian of the outer cambered surface of the middle block 1-2 is smaller than that of the inner cambered surface of the middle block 1-2, the inverted wedge-shaped structural form of the combination surface of the side surface, which is small in outside and large in inside, is kept, so that the edge foot ring well can be directly disassembled and disassembled, and can be repeatedly used. Aiming at the project of multi-shaft parallel operation, the manufacturing period of the blade foot pipe joint can be prolonged, and the shaft construction efficiency is improved.

Further, the side block 1-1 includes at least one splicing block, or two or more splicing blocks, and two adjacent splicing blocks are connected in the radial direction. The method is characterized in that the transportation and the disassembly are convenient, the working condition of dismantling in the well of the deviation-correcting blade leg pipe joint needs to be considered, each layer of blade leg ring is divided into a plurality of blocks which are pre-supported in advance in a factory, and the splicing blocks are connected through bolts and positioning pins. Because the cutting edge foot pipe joint is generally used for cutting and supporting soil in the open caisson process, the cutting edge foot ring is generally buried underground after the open caisson is formed, and the cutting edge foot pipe joint is wasted to a certain extent due to overhigh structure, so that the cutting edge foot pipe joint is divided into rings in the axial direction and blocks in the radial direction, the traditional form of the cutting edge foot pipe joint is optimized, the cutting edge foot pipe joint can be recycled, and the production cost is reduced.

As shown in fig. 4, example 2, a supporting structure of a cutting edge tube section comprises a standard annular tube section 4 and the cutting edge tube section described in example 1. The upper end face of the upper portion of the blade leg pipe joint is provided with a positioning spigot 9 for quickly positioning and installing a standard pipe joint, so that an installation reference of the standard pipe joint is provided, and the installation precision of the pipe joint is guaranteed.

Further, the block-type ring sleeve 1 of the blade leg pipe joint comprises three axial ring sleeves 10, namely a first axial ring sleeve 101, a second axial ring sleeve 102 and a third axial ring sleeve 103 from top to bottom in sequence, the outer wall of the axial ring sleeve 10 (namely the third axial ring sleeve 103) positioned at the lowest end is connected with a steel sleeve 5 through a bolt, and the outer wall of the steel sleeve 5 is provided with at least one sealing ring sleeve 6; the steel sleeve and the sealing lantern ring are used for sealing antifriction slurry outside the shaft, preventing the slurry from running off and ensuring the integrity of the antifriction slurry sleeve in the circumferential direction. The height of the steel sleeve 5 is greater than the height of a single axial collar 10. The steel sleeve is used as a temporary support for dismantling the blade leg pipe section, so that casualties and shaft deflection caused by stratum collapse are avoided, the height of the steel sleeve is generally higher than that of a single-layer blade leg ring, and the dismantling operation is completely carried out under the protection of the sleeve. The sealing lantern ring is used for sealing antifriction mud outside the pit shaft, prevents that mud from revealing, guarantees the integrality of antifriction mud cover.

Preferably, as shown in fig. 3, the seal ring sleeve 6 includes a pressure plate 601 and a seal ring 602 disposed on the steel sleeve 5, a lower portion of the seal ring 602 is inserted between the pressure plate 601 and the steel sleeve 5, and the pressure plate 601 fixes the seal ring 602 on the steel sleeve 5 by a bolt 603. The upper portion of the seal ring 602 extends outward to prevent leakage of the slurry and ensure integrity of the friction reducing slurry jacket.