CN111794249B - Construction method of shaft locking structure and shaft locking structure - Google Patents
Construction method of shaft locking structure and shaft locking structure Download PDFInfo
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- CN111794249B CN111794249B CN202010699260.8A CN202010699260A CN111794249B CN 111794249 B CN111794249 B CN 111794249B CN 202010699260 A CN202010699260 A CN 202010699260A CN 111794249 B CN111794249 B CN 111794249B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
Abstract
The invention discloses a construction method of a vertical shaft locking notch structure and the vertical shaft locking notch structure. The construction method comprises the following steps: excavating a locking notch base groove according to a preset excavation contour line, wherein a preset first ring position and a preset third ring position which are concentric with the locking notch base groove and sequentially sleeved from inside to outside are defined in the locking notch base groove; binding a fore shaft ring beam steel bar and a pre-inserted vertical stirrup between a preset first ring position and a preset third ring position to form a steel bar support, wherein the bottom of the outer peripheral surface of the steel bar support protrudes outwards along the radial direction to form a reinforcing protrusion; arranging embedded parts on the steel bar support; a locking ring beam template is supported and lapped outside the steel bar support in the locking base groove, and at least part of reinforcing bulges are pressed under the template; pouring the locking ring beam concrete between the position of the preset first ring and the position of the preset third ring; and (4) removing the fore shaft collar beam template and replacing and filling graded sand inclusion stones. Set up on the steel bar support and consolidate the arch, the gradation sand stone inclusion of packing can push down and consolidate the arch, can improve the stability of fore shaft structure.
Description
Technical Field
The invention relates to the technical field of tunneling construction, in particular to a construction method of a vertical shaft locking structure and the vertical shaft locking structure.
Background
With the increasing demand of developing underground space, the related industries are also continuously extended, including urban buildings, traffic engineering, mineral resources, water conservancy transportation, national defense engineering and other fields, and the structures and forms of underground engineering are also more and more diversified. In the face of large-scale underground engineering projects, the construction by adopting a mechanized means is gradually replacing the traditional manual excavation, so that the construction structure needs to be optimized to adapt to large-scale mechanized equipment aiming at specific projects.
In the face of shaft excavation, when a shaft heading machine is used for excavation, the design and construction of the locking form are very important for the smooth operation of the whole project. The vertical shaft locking opening needs to be adapted to specific geological conditions, has enough strength and rigidity, and can bear the pressure of rock and soil bodies at the position of the opening. In the construction process, the shaft locking notch needs to bear all structural dead weights and construction loads in the construction processes of a main support frame, a hydraulic lifting system, a propulsion system, a duct piece adjusting and transporting system, a slurry discharging pump, a steel pipe ring, a main drive, a cutter head and the like, and meanwhile, restraint in the horizontal direction needs to be provided, and the precision of the tunneling direction is kept.
The existing locking notch construction process can be used for general shaft construction, but when geological conditions are poor, the stability of the locking notch is difficult to meet the requirements of structural bearing and construction load, and the construction risk and hidden danger are larger than those of the traditional construction.
Therefore, how to provide a locking notch structure with better stability is a technical problem that needs to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, the invention aims to provide a construction method of a shaft locking notch structure, and the processed locking notch structure has good stability. The invention also aims to provide the vertical shaft locking notch structure which is manufactured by the construction method of the vertical shaft locking notch structure and has better stability.
In order to achieve the purpose, the invention provides the following technical scheme:
a construction method of a shaft locking structure comprises the following steps:
excavating a locking notch base groove according to a preset excavation contour line, wherein a preset first ring position and a preset third ring position which are concentric with the locking notch base groove and sequentially sleeved from inside to outside are defined in the locking notch base groove;
binding a locking collar beam steel bar and a pre-inserted vertical stirrup between the preset first collar position and the preset third collar position to form a steel bar support, wherein the bottom of the outer peripheral surface of the steel bar support protrudes outwards along the radial direction to form a reinforcing protrusion;
arranging embedded parts on the steel bar support;
a locking ring beam template is supported and lapped at the outer side of the steel bar support in the locking base groove, and at least part of the reinforcing bulges are pressed downwards by the locking ring beam template;
pouring the locking ring beam concrete between the preset first ring position and the preset third ring position;
and removing the locking collar beam template and replacing and filling the graded sand inclusion stones.
Preferably, the installing of the embedded part on the steel bar support comprises:
and an anti-twisting device is pre-embedded on the steel bar support.
Preferably, the steel bar support is provided with an embedded part, and the method further comprises the following steps:
and embedding a supporting leg embedded part on the steel bar support.
Preferably, the pouring of the fore shaft ring beam concrete between the preset first ring position and the preset third ring position includes:
and firstly, pouring concrete at the embedded part to fix the embedded part and the reinforcing steel bar support into a whole, and then pouring concrete at other positions between the preset first ring position and the preset third ring position.
Preferably, a preset second ring position concentric with the fore shaft base groove is further defined in the fore shaft base groove, and the preset second ring position is located between the preset first ring position and the preset third ring position;
the anti-twisting device is arranged between the preset first ring position and the preset second ring position;
the reinforcing protrusion is arranged between the position of the preset second ring and the position of the third ring;
the supporting leg embedded part is arranged between the position of the preset second ring and the position of the third ring and is positioned on the inner side of the reinforcing protrusion in the radial direction.
Preferably, the process of excavating the locking notch base groove according to the preset excavation contour line further includes: carrying out geological condition statistics;
the pre-buried landing leg built-in fitting on reinforcing bar support includes: and determining the setting position of the supporting leg embedded part according to the result of the geological condition statistics.
Preferably, the diameter of the bottom of the outer peripheral surface of the locking notch base groove is gradually reduced from top to bottom.
A shaft locking structure comprises a locking base groove, wherein a preset first ring position and a preset third ring position which are concentric with the locking base groove and sequentially sleeved from inside to outside are defined in the locking base groove; and binding a locking collar beam steel bar and pre-inserting a vertical stirrup between the preset first collar position and the preset third collar position to form a steel bar support, wherein the bottom of the outer peripheral surface of the steel bar support protrudes outwards along the radial direction to form a reinforcing protrusion, an embedded part is arranged on the steel bar support, locking collar beam concrete is poured on the steel bar support, and an outer ring of the reinforced concrete in the locking collar foundation groove is filled with filling grade sand-mixing stones.
Preferably, the embedded part comprises an anti-twisting device, and the anti-twisting device comprises an anti-twisting block, a radial oil cylinder used for driving the anti-twisting block to stretch along the radial direction and a circumferential oil cylinder used for driving the anti-twisting block to stretch along the circumferential direction.
Preferably, the diameter of the bottom of the outer peripheral surface of the locking notch base groove is gradually reduced from top to bottom.
According to the construction method of the shaft locking structure, the reinforcing protrusions are arranged on the steel bar support, and after concrete is poured and the locking ring beam template is disassembled, the filled graded sand inclusion stones can press the reinforcing protrusions, so that the stability of the locking structure can be improved.
The vertical shaft locking structure manufactured by applying the construction method of the vertical shaft locking structure provided by the invention has better stability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a plan view of a shaft locking notch structure provided by the present invention;
FIG. 2 is a cross-sectional view taken along line C-C of FIG. 1;
fig. 3 is a plan view of an anti-twist device in a shaft locking structure provided by the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
fig. 5 is a plan view of a leg embedment in a shaft locking structure provided by the present invention;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;
FIG. 7 is a flow chart of a method provided by the present invention.
Reference numerals:
reinforcing bar support 1, reinforcing protrusion 11, landing leg built-in fitting 2, antitorque song device 3, gradation sand inclusion stone 4.
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 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.
The core of the invention is to provide a construction method of a vertical shaft locking notch structure, and the processed locking notch structure has good stability. The other core of the invention is to provide the vertical shaft locking notch structure which is manufactured by applying the construction method of the vertical shaft locking notch structure and has better stability.
It will be understood that when an element is referred to as being "secured" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The construction method of the shaft locking notch structure provided by the invention comprises the following steps:
and S1, excavating the locking notch base groove according to the preset excavation contour line.
The locking notch base groove is annular, and during excavation, the overall excavation radius is controlled to be 13-15 m through paying-off measurement, namely the maximum radius of the outer peripheral surface of the locking notch base groove is 13-15 m. When in excavation, the set circle center position is used as the center, and the deep groove and the groove are excavated from the center outwards along the radial direction.
The method comprises the following steps of setting a reference position in a locking notch foundation groove for subsequent construction, and specifically comprises the steps of presetting a first ring position, presetting a second ring position and presetting a third ring position. The preset first ring position, the preset second ring position and the preset third ring position are all set positions and are not solid structures. And a certain distance exists between the position of the preset third ring and the outer peripheral surface of the locking notch base groove in the radial direction.
And S2, binding the steel bar of the fore shaft girth beam and the pre-inserted vertical stirrups between the preset first ring position and the preset third ring position to form a steel bar support 1, wherein the bottom of the outer peripheral surface of the steel bar support 1 protrudes outwards along the radial direction to form a reinforcing protrusion 11.
In this case, the reinforcing bar support 1 may be provided with a tapered surface having a diameter gradually increasing from the top to the bottom, and the bottom of the tapered surface protrudes from the top to form the reinforcing protrusion 11. More preferably, as shown in fig. 2, the outer peripheral surface of the reinforcing member is composed of an upper cylindrical surface, a lower cylindrical surface disposed at the lower side of the upper cylindrical surface, and a step surface disposed between the two cylindrical surfaces, the diameter of the lower cylindrical surface is larger than that of the upper cylindrical surface, and the corresponding portion of the lower cylindrical surface constitutes the reinforcing protrusion 11.
And S3, arranging embedded parts on the steel bar bracket 1.
The embedded part can be specifically arranged according to actual needs. Because the embedded part and the locking notch are used as a whole to assist construction, the embedded part needs to be assembled on the steel bar bracket 1 in advance and is arranged in a reserved space on site.
S4: and a locking ring beam template is supported and lapped at the outer side of the steel bar support 1 in the locking base groove, and at least part of the reinforcing protrusion 11 is pressed under the locking ring beam template.
S5: and pouring the locking ring beam concrete between the position of the preset first ring and the position of the preset third ring.
S6: and (4) removing the locking collar beam template and replacing and filling the graded sand inclusion stones 4.
In this embodiment, set up on steel bar support 1 and consolidate protruding 11, behind concreting and pull down fore shaft gird beam template, the level of filling is joined in marriage sand and is pressed down and consolidate protruding 11 to can improve the stability of fore shaft structure.
Further, S3 specifically includes: an anti-twisting device 3 is pre-embedded on the steel bar bracket 1. In addition, while the torsion-preventing devices 3 are embedded in the steel bar support 1, torsion-preventing anchor bolts are installed on both sides of each torsion-preventing device 3 in the circumferential direction, so that the torsion-preventing devices 3 are fixed on the steel bar support 1.
Through the additional arrangement of the anti-torsion device 3, in the tunneling process, the composite steel structure of the tunneling equipment stretching into the locking opening is radially compressed to drive the central point of the composite steel structure to translate, so that the posture of the whole composite steel structure is adjusted.
Further, S3 includes: and embedding a supporting leg embedded part 2 on the steel bar support 1. In addition, when the supporting leg embedded parts 2 are embedded in the steel bar support 1, supporting leg foundation bolts are installed in the supporting leg embedded parts 2, so that the supporting leg embedded parts 2 can be reliably fixed to the steel bar support 1.
The supporting leg embedded part 2 is used for detachably connecting supporting legs on a main supporting frame of the tunneling equipment, and the supporting legs are detachable supporting legs and are detachably connected with the supporting leg embedded part 2. The supporting leg embedded parts 2 provide a modular structure for supporting the main supporting frame, provide convenience for dismounting and transporting the main supporting frame, and meet the requirements of field hoisting. After the engineering, the landing leg can be followed landing leg built-in fitting 2 and dismantled the transportation, when furthest guaranteed that the support steel construction can reuse, can guarantee that the construction is ended the back ground and not remain too much construction structure.
In the present embodiment, the embedment includes the torsion-preventing device 3 and the leg embedment 2, and in other embodiments, the embedment may include only one of the two, or include other structures as well.
Further, pour the fore shaft ring roof beam concrete between predetermineeing first ring position and predetermineeing the third ring position, include: concrete is poured at the position of the embedded part to fix the embedded part and the steel bar support 1 into a whole, and then concrete is poured at other positions between the position of the preset first ring and the position of the preset third ring.
In the embodiment, the position of the embedded part is poured firstly, so that the embedded part and the steel bar support 1 are fixed into a whole, one-step forming is achieved, pouring of other positions is performed, and the construction efficiency is improved.
Further, the anti-twist device 3 is arranged between the preset first ring position and the preset second ring position. The reinforcing protrusion 11 is provided between the predetermined second loop position and the third loop position. The supporting leg embedded part 2 is arranged between the position of the preset second ring and the position of the preset third ring and is positioned on the inner side of the reinforcing protrusion 11 in the radial direction.
The anti-twist device 3 and the supporting leg embedded part 2 are sequentially distributed in the radial direction, so that stress concentration on the locking notch structure can be reduced.
Further, at the in-process according to preset excavation contour line excavation fore shaft foundation ditch, still include: and carrying out geological condition statistics. Accordingly, in step: in pre-buried landing leg built-in fitting 2 on steel bar support 1, specifically include: and determining the arrangement direction of the leg embedded part 2 according to the result of the geological condition statistics.
When the geological condition statistics is carried out in the excavation process, the geological condition in the operation range is classified and counted, corresponding mechanical tests are carried out on different soil bodies and exposed strata, construction strengthening treatment is conveniently carried out on the stratum with lower strength and the direction of the stress concentration of the regional structure in the later period, and the selection design of the arrangement direction of the embedded part is included.
Specifically, the leg embedded parts 2 are arranged in two groups at an interval of 180 °, each group of leg embedded parts 2 includes a plurality of leg embedded parts 2, for example, 4 leg embedded parts, and the leg embedded parts 2 in each group of leg embedded parts 2 are arranged in sequence along the circumferential direction. In the process of embedding the supporting leg embedded parts 2 in the steel bar support 1, the selection of the direction is combined with the earlier-stage survey result, and the region with stable stress is selected so as to ensure the reliable fixation and stable support of the main supporting frame. In the orientation shown in fig. 1, the two sets of leg embedments 2 are disposed in a left-right opposite manner, and in other embodiments, the orientation shown in fig. 1 is also taken as an example, and the two sets of leg embedments 2 may also be disposed in an up-down opposite manner.
Furthermore, the diameter of the bottom of the outer peripheral surface of the locking notch base groove is gradually reduced from top to bottom. Alternatively, as shown in fig. 2, the bottom of the outer peripheral surface of the locking notch base groove forms an angle of 60 ° with respect to the horizontal plane. The upper side of the outer peripheral surface of the locking notch base groove is a cylindrical surface with equal diameter and butted with the inclined surface. At the moment, the steel bar support 1 forms a wedge-shaped structure with a small radial size, and the graded sand inclusion stones 4 form a wedge-shaped structure with a large radial size after being filled.
In this embodiment, through the setting on inclined plane, be convenient for backfill grit on the one hand, on the other hand can reduce the excavation volume, does benefit to the control to later stage construction cost.
Besides the construction method, the invention also provides a vertical shaft locking notch structure manufactured by applying the construction method, which is suitable for vertical shaft tunneling construction, and the beneficial effects can be correspondingly referred to the above embodiments.
Specifically, the shaft locking structure comprises a locking base groove, and a preset first ring position and a preset third ring position which are concentric with the locking base groove and sequentially sleeved from inside to outside are defined in the locking base groove. The steel bar support 1 is formed by binding the steel bars of the fore shaft ring beam and pre-inserting the vertical stirrups between the position of the first ring and the position of the third ring, the bottom of the outer peripheral surface of the steel bar support 1 protrudes outwards along the radial direction to form a reinforcing protrusion 11, the steel bar support 1 is provided with an embedded part, the steel bar support 1 is poured with the concrete of the fore shaft ring beam, and the outer ring of the steel bar concrete in the fore shaft base groove is filled with filling grade sand-mixing stones 4.
Further, the embedment includes a torsion prevention device 3. The anti-twist device 3 comprises an anti-twist block, a radial oil cylinder for driving the anti-twist block to stretch out and draw back along the radial direction and a circumferential oil cylinder for driving the anti-twist block to stretch out and draw back along the circumferential direction. Optionally, the anti-twisting block is connected to an output end of the radial cylinder, a cylinder body of the radial cylinder is connected to an output end of the circumferential cylinder, and the cylinder body of the circumferential cylinder is fixed on the steel bar support 1. Preferably, the torsion preventing means 3 is provided in plurality and equally spaced in the circumferential direction, for example, 4 torsion preventing means 3 are uniformly arranged in the circumferential direction. In addition, 3 anti-twist anchor bolts are respectively arranged on two sides of each anti-twist device 3 in the circumferential direction for fixation. The anti-twist block presses the composite steel structure along the radial direction, the radial oil cylinder acts to enable the anti-twist block to move along the radial direction, and the circumferential oil cylinder acts to enable the anti-twist block to move along the circumferential circumference. By controlling the stretching out and retracting back of the anti-twist block, the central point of the composite steel structure at the position of the wellhead can be adjusted to translate, so that the posture of the whole composite steel structure can be adjusted.
Further, the embedded parts also comprise leg embedded parts 2 so as to be detachably and fixedly connected with the main support frame. Optionally, 4 leg embedded parts 2 are arranged in one group, and two groups are arranged and oppositely arranged on the fore shaft structure. Each leg embedment 2 houses 16 leg anchor bolts.
Furthermore, the diameter of the bottom of the outer peripheral surface of the locking notch base groove is gradually reduced from top to bottom.
The fore shaft structure provided by the embodiment adopts a wedge-shaped steel bar structure design and a corresponding excavation groove form, is provided with a supporting leg embedded part 2 suitable for shaft tunneling and an anti-twisting device 3 for adjusting the shaft tunneling posture, and is suitable for shaft tunneling machine construction. The wedge-shaped embedded stratum or soil body is adopted, the development stratum and the structural attitude characteristics of the construction area range can be attached to the maximum extent, stress strain generated in the construction process can be effectively dispersed, safety risks caused by additional stress concentration are prevented, and structural bearing and construction loads required by the vertical shaft heading machine can be met. The anti-twist device improves the efficiency of later mechanical assembly and also ensures the stability of the steel structure in tunneling construction. The wedge-shaped locking opening has a large operation area, can meet the requirements of large-scale mechanized construction, can pretreat complex earth surface geology in advance, ensures the stability of peripheral soil bodies and strata, and can effectively reduce the problems of overall sinking of a well body and collapse of a well wall.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The construction method of the shaft locking structure and the shaft locking structure provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. A construction method of a vertical shaft locking notch structure is characterized by comprising the following steps:
excavating a locking notch base groove according to a preset excavation contour line, wherein a preset first ring position and a preset third ring position which are concentric with the locking notch base groove and sequentially sleeved from inside to outside are defined in the locking notch base groove;
binding a locking collar beam steel bar and a pre-inserted vertical stirrup between the preset first collar position and the preset third collar position to form a steel bar support (1), wherein the bottom of the outer peripheral surface of the steel bar support (1) protrudes outwards along the radial direction to form a reinforcing protrusion (11);
arranging embedded parts on the steel bar support (1), wherein the embedded parts comprise an embedded anti-torsion device (3) and a supporting leg embedded part (2) which are embedded on the steel bar support (1);
a locking ring beam template is supported and lapped at the outer side of the steel bar support (1) in the locking base groove, and at least part of the reinforcing protrusion (11) is pressed downwards by the locking ring beam template;
pouring the locking ring beam concrete between the preset first ring position and the preset third ring position;
dismantling the fore shaft ring beam template and replacing and filling the graded sand inclusion stones (4);
a preset second ring position concentric with the fore shaft base groove is further defined in the fore shaft base groove, and the preset second ring position is located between the preset first ring position and the preset third ring position; the anti-twisting device (3) is arranged between the preset first ring position and the preset second ring position; the reinforcing protrusion (11) is arranged between the position of the preset second ring and the position of the third ring; the supporting leg embedded part (2) is arranged between the position of the preset second ring and the position of the third ring and is located on the inner side of the reinforcing protrusion (11) in the radial direction.
2. The method for constructing a shaft fore shaft structure according to claim 1, wherein the pouring the fore shaft loop beam concrete between the preset first loop position and the preset third loop position comprises:
concrete is poured at the embedded part to fix the embedded part and the steel bar support (1) into a whole, and then concrete is poured at other positions between the preset first ring position and the preset third ring position.
3. The construction method of the shaft fore shaft locking notch structure according to claim 1, characterized in that in the process of excavating the fore shaft locking notch base groove according to the preset excavation contour line, the construction method further comprises: carrying out geological condition statistics;
the pre-buried landing leg built-in fitting (2) in reinforcing bar support (1) includes: and determining the setting position of the supporting leg embedded part (2) according to the result of the geological condition statistics.
4. A construction method of a shaft locking notch structure according to any one of claims 1 to 3, characterized in that the diameter of the bottom of the outer peripheral surface of the locking notch base groove is gradually reduced from top to bottom.
5. A shaft locking notch structure, characterized in that the shaft locking notch structure is manufactured by the construction method of the shaft locking notch structure as claimed in any one of claims 1 to 4;
the shaft locking structure comprises a locking notch base groove, and a preset first ring position and a preset third ring position which are concentric with the locking notch base groove and sequentially sleeved from inside to outside are defined in the locking notch base groove; the steel bar support is characterized in that a steel bar support (1) is formed between the preset first ring position and the preset third ring position through binding of a locking collar beam steel bar and pre-inserting of a vertical hoop steel bar, the bottom of the outer peripheral surface of the steel bar support (1) protrudes outwards in the radial direction to form a reinforcing protrusion (11), an embedded part is arranged on the steel bar support (1), locking collar beam concrete is poured on the steel bar support (1), and filling grade sand-mixed stones (4) are filled in the outer ring of the steel bar concrete in the locking collar base groove.
6. A shaft fore shaft locking notch structure according to claim 5, characterized in that the embedded part comprises an anti-twist device (3), and the anti-twist device (3) comprises an anti-twist block, a radial cylinder for driving the anti-twist block to extend and retract along the radial direction, and a circumferential cylinder for driving the anti-twist block to extend and retract along the circumferential direction.
7. A shaft locking notch structure as claimed in claim 5, wherein the diameter of the bottom of the outer peripheral surface of the locking notch base groove is gradually reduced from top to bottom.
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| CN202010699260.8A CN111794249B (en) | 2020-07-20 | 2020-07-20 | Construction method of shaft locking structure and shaft locking structure |
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| CN202010699260.8A CN111794249B (en) | 2020-07-20 | 2020-07-20 | Construction method of shaft locking structure and shaft locking structure |
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| CN111794249B true CN111794249B (en) | 2022-03-15 |
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| 竖井锁口分层控制拆除爆破施工技术;王文强;《内蒙古煤炭经济》;20161225(第24期);第122-123页 * |
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| CN111794249A (en) | 2020-10-20 |
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