CN113334568B

CN113334568B - Segment whole ring structure and segment whole ring prefabrication method

Info

Publication number: CN113334568B
Application number: CN202110631338.7A
Authority: CN
Inventors: 赵修旺; 贾连辉; 毕程程; 于少辉; 白中坤; 王宁; 李应飞; 赵澍; 李明芳
Original assignee: China Railway Engineering Equipment Group Co Ltd CREG
Current assignee: China Railway Engineering Equipment Group Co Ltd CREG
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2023-06-30
Anticipated expiration: 2041-06-07
Also published as: CN113334568A

Abstract

The invention relates to a duct piece whole ring structure and a duct piece whole ring prefabrication method, wherein the prefabrication method comprises the following steps: firstly, assembling a prefabricated die, namely assembling the prefabricated die according to a preset segment whole ring contour line, wherein a pouring ring cavity is defined by a bottom template, an inner template, an outer template and a top template of the prefabricated die, a plurality of end plate groups are sequentially arranged in the pouring ring cavity, each end plate group comprises two end plates which are detachably and fixedly assembled together, and any two adjacent end plate groups are relatively and fixedly assembled together through a middle steel skeleton respectively; step two, pouring concrete in the pouring annular cavity; and thirdly, removing the mould and maintaining, and separating corresponding two end plates from each end plate group to obtain a plurality of prefabricated duct piece blocks. The prefabricated mould is utilized to form a pouring annular cavity, the end plate group and the middle steel skeleton are arranged in the pouring annular cavity, retarding soil is poured in the pouring annular cavity to form a whole-ring duct piece, and the forming precision can be effectively ensured due to the adoption of a whole-ring pouring forming mode, so that the device is suitable for being applied to full-scale experiments.

Description

Segment whole ring structure and segment whole ring prefabrication method

Technical Field

The invention relates to a segment whole ring structure and a segment whole ring prefabrication method.

Background

Currently, for subway tunnel shield excavation, duct pieces are required to be used for masonry and supporting tunnel walls. The segment ring is usually assembled and formed by prefabricated segments in blocks, and the mold corresponding to each segment comprises a bottom plate, an upper cover and four side plates. The production process mainly comprises the following steps:

1) Cleaning the die, and removing residues on the surface of the die;

2) Assembling the template and spraying a release agent;

3) Installing the reinforcement cage in the mold and installing the embedded part at the same time;

4) Pouring concrete;

5) After pouring and initial setting, performing steam curing on the poured duct piece;

6) And carrying out demolding treatment on the pipe piece, and placing the demolded pipe piece in a water tank for maintenance until the design requirement is met.

In order to explore the mechanical properties of the novel duct piece, a full-scale test is often carried out indoors or on site, wherein the full-scale test is to manufacture the actual duct piece according to one-to-one design size so as to carry out a corresponding test. When the full-scale test is performed, the requirement on the manufactured duct piece is high, errors are easy to occur when the conventional segmented prefabricated duct piece is assembled, and the duct piece is not suitable for the trial production of the duct piece in the full-scale test. Moreover, because the number of the segments required by the trial production of single full-length segments is small, the cost of specially-made dies is high, the requirements on hardware are strict by steaming and water maintenance, and the whole cost is relatively high.

Disclosure of Invention

The invention aims to provide a segment whole ring prefabrication method, which solves the technical problem that a mode of block prefabrication and then integral assembly in the prior art is not suitable for being applied to full-scale experiments due to error; meanwhile, the invention also provides a segment whole ring structure which can be obtained by processing the segment whole ring prefabricating method.

In order to achieve the above purpose, the technical scheme of the segment whole ring structure provided by the invention is as follows:

a segment full ring structure comprising:

the duct piece segments are sequentially in butt joint arrangement along a preset duct piece whole ring contour line, and the direction on the duct piece segments, which is the same as the extending direction of the preset duct piece whole ring contour line, is defined as the segment length direction;

each segment block comprises two end plates which are distributed at intervals along the whole ring contour line of the preset segment, and a concrete body which is positioned between the two end plates and is integrally cast with the two end plates, wherein a middle steel skeleton is arranged in the concrete body and extends along the length direction of the segment, and in the same segment block, the two ends of the middle steel skeleton in the length direction of the segment block are in one-to-one corresponding welding connection with the corresponding two end plates;

bolt mounting holes are respectively formed in two end plates of each segment block, and inter-block hand holes are formed in the concrete body corresponding to the bolt mounting holes;

and on the extending direction of the preset segment whole ring contour line, the two end plates at the two opposite ends of any two adjacent segment blocks are attached, and fastening bolts are penetrated in bolt mounting holes on the two end plates which are correspondingly attached through inter-block hand holes on the segment blocks, so that the two segment blocks are fixedly assembled together through the fastening bolts, and then the segment whole ring structure is formed.

The beneficial effects are that: in the segment whole ring structure provided by the invention, the end plates of the adjacent segment blocks can be fixedly assembled through the penetrating fastening bolts, so that all segment blocks can be conveniently and sequentially arranged according to the preset segment whole ring contour line, and further the segment whole ring structure is formed. Because both ends head board and concrete body are integrative to pour the shaping, under the circumstances that can realize whole ring processing preparation, can effectively guarantee the assembly precision of section of jurisdiction whole ring structure.

As a further improvement, the middle steel skeleton of each segment block comprises a section steel extending along the length direction of the segment block and a plurality of longitudinal steel bars welded with the section steel, wherein the direction, which is consistent with the extending direction of the corresponding tunnel, of the segment block is defined as the width direction of the segment block, the longitudinal steel bars extend along the width direction of the segment block, and a plurality of longitudinal steel bars are distributed at intervals along the length direction of the segment block.

The beneficial effects are that: the middle steel skeleton comprises transversely extending section steel and longitudinally extending longitudinal steel bars, so that the strength of the middle steel skeleton can be effectively ensured, and the integral strength of the segment blocks can be improved.

As a further improvement, the section steel is distributed with more than two sections at intervals in the width direction of the section, a plurality of blanking holes are sequentially arranged on each section steel along the length direction of the section, and each blanking hole penetrates through the corresponding section steel along the width direction of the section, so that concrete slurry can enter the lower part of the corresponding section steel when concrete pouring is performed.

The beneficial effects are that: and a blanking hole is formed in the section steel, so that concrete slurry can enter the lower part of the section steel during casting molding conveniently.

As a further improvement, the cross section of the inter-block hand hole in the block length direction is rectangular or trapezoidal.

The beneficial effects are that: the corresponding cross section of the inter-block hand hole is rectangular or trapezoidal, and is suitable for bolt fastening operation at the inter-block hand hole.

The technical scheme of the segment whole ring prefabrication method provided by the invention is as follows: a segment whole ring prefabrication method comprises the following steps:

step one, assembling a prefabricated mold;

assembling a prefabricated die according to a preset duct piece whole ring contour line, enclosing a pouring ring cavity by a bottom template, an inner template, an outer template and a top template of the prefabricated die, sequentially arranging a plurality of end plate groups along the preset duct piece whole ring contour line in the pouring ring cavity, wherein each end plate group comprises two end plates which are detachably and fixedly assembled together through fastening bolts, inter-block hand hole sleeves are respectively fixedly arranged on two opposite sides of the two end plates of each end plate group corresponding to the fastening bolts, the inter-block hand hole sleeves are matched with the prefabricated die to enclose a manual reserved cavity in the pouring ring cavity, and any two adjacent end plate groups are respectively and fixedly assembled together through a middle steel skeleton;

step two, pouring concrete in the pouring annular cavity;

and thirdly, removing the mould, maintaining, separating corresponding two end plates at each end plate group, relatively and fixedly assembling the concrete bodies formed by integral pouring of the corresponding two end plates together to obtain a plurality of prefabricated duct piece blocks, and fixedly connecting any two prefabricated duct piece blocks together through corresponding fastening bolts by utilizing inter-block hand holes formed on the concrete bodies after removing inter-block hand hole sleeve boxes, so that all duct piece blocks are fixedly assembled together in sequence according to a preset duct piece whole ring contour line to form a duct piece whole ring structure.

The beneficial effects are that: according to the segment whole ring prefabrication method provided by the invention, the prefabrication mould is utilized to form the pouring ring cavity, the end plate group and the middle steel skeleton are arranged in the pouring ring cavity, then retarder soil is poured in the pouring ring cavity to form the whole ring segment, and then the segment blocks can be formed by splitting at the end plate group. Moreover, the middle steel skeleton in the prefabricated die is utilized to fix the end plate group, so that the position accuracy of the end plate group can be guaranteed, the integral strength of the segment blocks after forming can be effectively improved, a hand hole sleeve box between blocks is arranged on one side corresponding to the corresponding end plate, hand holes between blocks are formed conveniently, and the segment blocks are spliced and assembled together conveniently.

In the first step, the bottom template, the inner template, the outer template and the top template are sequentially arranged, the bottom template, the inner template, the outer template and the top template all extend along the preset segment full-ring contour, wherein after the inner template is arranged, the end plate group and the middle steel skeleton are arranged outside the inner template along the preset segment full-ring contour, and then the outer template is arranged.

The beneficial effects are that: the mode of firstly installing the inner side template, then installing the end plate group and the middle steel skeleton and then installing the outer side template is more suitable for vertical arrangement, is convenient to install and is convenient to adjust and replace.

As a further improvement, the middle steel skeleton comprises a section steel extending along the whole ring contour line of the preset duct piece, a plurality of blanking holes are sequentially arranged on the section steel along the length direction of the section steel, each blanking hole extends along the up-down direction, and when concrete is poured in the second step, concrete slurry enters the lower portion of the section steel through the blanking holes.

The beneficial effects are that: and blanking holes are arranged on the section steel, so that concrete can flow to the bottom of the pouring annular cavity conveniently when concrete pouring is performed.

As a further improvement, the section steel is I-steel or H-steel, the section steel is provided with a web plate, the web plate of the section steel is horizontally arranged, and a plurality of blanking holes are sequentially and alternately distributed on the web plate of the section steel along the extending direction of the section steel.

The beneficial effects are that: the web of shaped steel is arranged horizontally, and arrange the unloading hole on the web, under the circumstances of guaranteeing intensity, the convenient processing preparation unloading hole.

As a further improvement, the blanking hole is provided with a set aperture, and in the second step, a vibrating rod is arranged in the blanking hole until the bottom of the pouring ring cavity is compacted by vibrating until the concrete pouring is completed.

The beneficial effects are that: the vibrating rod is arranged in the blanking hole, so that the vibrating is convenient to compact, and the pouring effect is improved.

As a further improvement, in the first step, the inter-block hand hole boxes are filled with expansion materials, so that concrete slurry is prevented from blocking the inter-block hand hole boxes during subsequent concrete pouring.

The beneficial effects are that: the expansion material is injected into the inter-block hand hole sleeve box, so that the concrete slurry is prevented from blocking the inter-block hand hole sleeve box conveniently, and the follow-up demolding and the repeated use are affected.

Drawings

FIG. 1 is a schematic view of a segment full ring structure provided by the present invention;

FIG. 2 is an enlarged view of H in FIG. 1;

FIG. 3 is a schematic view of the assembly of the section steel inside the concrete body of FIG. 1;

fig. 4 is a schematic diagram of a preset segment whole ring contour line according to embodiment 1 of the segment whole ring prefabrication method according to the present invention;

fig. 5 is a schematic diagram of the duct piece whole ring prefabrication method according to the present invention in example 1 after bottom formwork installation, inner formwork installation, skeleton installation, outer formwork installation, concrete pouring and formwork removal (wherein fig. 5 (a) is bottom formwork installation, fig. 5 (b) is inner formwork installation, fig. 5 (c) is skeleton installation, fig. 5 (d) is installation of longitudinal steel bars and inter-block hand hole boxes, fig. 5 (e) is outer formwork installation, fig. 5 (f) is concrete pouring, and fig. 5 (g) is formwork removal);

FIG. 6 is a corresponding sectional view in FIG. 5 (wherein FIG. 6 (a) is a sectional view A-A in FIG. 5 (a), FIG. 6 (B) is a sectional view B-B in FIG. 5 (B), FIG. 6 (C) is a sectional view C-C in FIG. 5 (C), FIG. 6 (D) is a sectional view D-D in FIG. 5 (D), FIG. 6 (E) is a sectional view E-E in FIG. 5 (E), FIG. 6 (F) is a sectional view F-F in FIG. 5 (F), and FIG. 6 (G) is a sectional view G-G in FIG. 5 (G)).

Fig. 7 is a plan view corresponding to fig. 5 (wherein fig. 7 (a) is a plan view of fig. 5 (a), fig. 7 (b) is a plan view of fig. 5 (b), fig. 7 (c) is a plan view of fig. 5 (c), fig. 7 (d) is a plan view of fig. 5 (d), fig. 7 (e) is a plan view of fig. 5 (e), fig. 7 (f) is a plan view of fig. 5 (f), a top template is not shown, and fig. 7 (g) is a plan view of fig. 5 (g)).

FIG. 8 is a schematic view of the middle segment block of FIG. 5;

fig. 9 is a sectional view of a segment block obtained in example 4 of the segment whole ring prefabrication method according to the present invention.

Reference numerals illustrate:

1. a base; 2. a bottom template; 2-1, a top template; 3. an inner side template; 4. an outer template; 5. back edge; 6. a screw rod; 7. diagonal bracing; 9. a reinforcement cage; 90. longitudinal steel bars; 10. section steel; 10-1, a blanking hole; 11. an end plate; 12. inter-block hand holes; 120. a hand hole box between blocks; 13. a hand hole between the rings; 130. screw ribs of the hand hole of the ring piece; 14. hoisting the hole sleeve; 15. a concrete filler; 150. a concrete body; 16. a fastening bolt; 100. a center point; 200. presetting a segment whole ring contour line; 300. segment blocking; 400. and (5) blocking the middle duct piece.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.

It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" is not intended to exclude processes, methods comprising such element.

In the description of the present invention, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.

In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the term "provided" may be interpreted broadly, and for example, an object "provided" may be a part of a body, may be separately disposed from the body, and may be connected to the body, where the connection may be a detachable connection or an undetachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.

The present invention is described in further detail below with reference to examples.

The segment whole ring prefabrication method provided by the invention is used for manufacturing a segment structure by whole rings, and after pouring is finished, each segment block 300 is split, so that the manufacturing precision can be effectively ensured due to the fact that the whole rings are manufactured together, the problem of large error caused by block pouring and whole ring assembly is avoided, and the segment whole ring prefabrication method is suitable for segment trial manufacture applied to full-scale experiments.

The embodiment of the segment whole ring structure provided by the invention comprises the following steps:

as shown in fig. 1 to 3, the duct piece whole ring structure in this embodiment may be formed by a duct piece whole ring prefabrication method described below, where the duct piece whole ring structure specifically includes a plurality of duct piece segments 300, where the plurality of duct piece segments 300 may be sequentially butt-jointed along a preset duct piece whole ring contour line 200, for convenience of description, a direction of the duct piece segments 300, which is the same as an extending direction of the preset duct piece whole ring contour line 200, is defined as a segment length direction, a direction of the duct piece segments 300, which is consistent with a corresponding tunnel extending direction, is defined as a segment width direction, each duct piece segment 300 includes two end plates 11 distributed at intervals along the preset duct piece whole ring contour line 200, and concrete bodies 150 located between the two end plates 11 and integrally cast with the two end plates 11, where the concrete bodies 150 are provided with intermediate steel frameworks, and the intermediate steel frameworks extend along the segment length direction, and in the same segment 300, two ends of the intermediate steel frameworks in the segment length direction are welded and connected with the corresponding two end plates 11 one by one.

In addition, bolt mounting holes are respectively provided on the two end plates 11 of each segment block 300, and inter-block hand holes 12 are provided on the concrete body corresponding to the bolt mounting holes, wherein the cross section of the inter-block hand holes 12 in the block length direction is trapezoidal, and the trapezoid refers to a structure similar to a trapezoid. As shown in fig. 2, in the extending direction of the preset duct piece whole ring contour line 200, two end plates 11 at two opposite ends of any two adjacent duct piece sub-blocks 300 are attached, fastening bolts 16 are inserted into bolt mounting holes on the corresponding attached two end plates 11 through inter-block hand holes 12 on the duct piece sub-blocks 300, and the two adjacent duct piece sub-blocks 300 can be fixedly assembled together through the corresponding fastening bolts 16, so as to form a duct piece whole ring structure.

In this embodiment, the middle steel skeleton of each segment block 300 includes a section steel 10 extending along the length direction of the segment block and a plurality of longitudinal steel bars 90 welded with the section steel 10, where the longitudinal steel bars 90 extend along the width direction of the segment block, and all the longitudinal steel bars 90 are distributed at intervals along the length direction of the segment block, so as to form a stronger supporting strength. Of course, in other embodiments, if the strength can meet the design requirement, only the section steel may be provided, and the longitudinal steel bar may be omitted.

In addition, in order to improve the strength, two sections 10 are distributed at intervals in the width direction of the block, and a plurality of blanking holes 10-1 are sequentially arranged on each section 10 along the length direction of the block, and each blanking hole 10-1 penetrates through the corresponding section 10 along the width direction of the block so as to allow concrete slurry to enter the lower part of the corresponding section 10 when concrete pouring is performed.

In the present embodiment, the cross section of the corresponding inter-block hand hole 12 in the block length direction is an approximately trapezoidal structure, and in other embodiments, the cross section of the inter-block hand hole 12 may be an approximately rectangular structure as long as sufficient operation space can be provided.

In this embodiment, the middle steel skeleton in the concrete body 150 includes the section steel 10, and in other embodiments, as shown in fig. 9, the middle steel skeleton may also use the reinforcement cage 9 to ensure the structural strength of the segment blocks.

The concrete example 1 of the segment whole ring prefabrication method provided by the invention comprises the following steps:

the prefabrication method integrally comprises the following steps:

step one, assembling a prefabricated die

According to the preset segment whole ring contour line 200 shown in fig. 4, a prefabricated mold is assembled, a pouring ring cavity is formed by the bottom template 2, the inner template 3, the outer template 4 and the top template 2-1 of the prefabricated mold, a plurality of end plate groups are sequentially arranged in the pouring ring cavity along the preset segment whole ring contour line 200, each end plate group comprises two end plates 11 which are detachably and fixedly assembled together, and any two adjacent end plate groups are relatively and fixedly assembled together through a middle steel skeleton.

Of course, in order to realize the fastening and assembling mode by bolts, the two opposite sides of the two end plates 11 of the end plate group are respectively and fixedly provided with inter-block hand hole boxes 120 corresponding to the fastening bolts 16, the inter-block hand hole boxes 120 are matched with the prefabricated mold to enclose a manual reserved cavity in the pouring ring cavity, and any two adjacent end plates are respectively and relatively and fixedly assembled together by the middle steel skeleton.

And secondly, pouring concrete in the pouring annular cavity.

And thirdly, after the duct piece reaches the set strength, removing the mould and curing in time, separating the corresponding two end plates 11 at each end plate group, and relatively and fixedly assembling the concrete body 150 formed by integrally pouring the corresponding two end plates 11 together to obtain a plurality of prefabricated duct piece sub-blocks 300, wherein by utilizing the inter-block hand holes 12 formed on the concrete body 150 after removing the inter-block hand hole sleeve box 120, two prefabricated duct piece sub-blocks 300 can be fixedly connected together through corresponding fastening bolts 16, and all duct piece sub-blocks 300 are fixedly assembled together in sequence according to the preset duct piece whole ring contour line 200, so that a duct piece whole ring structure can be formed.

Specifically, the prefabricated mold in the first step may be formed by splicing and assembling in the following manner, and the prefabricated mold may be assembled according to the steps of positioning the prefabricated structure, mounting the bottom template, mounting the inner template, mounting the skeleton, mounting the outer template, and mounting the top template.

Positioning a prefabricated structure: firstly, field hardening and leveling are carried out, and because the prefabricated pipe piece is in an annular closed structure, the field hardening and leveling range can be determined according to actual needs, and the field hardening and leveling can be carried out within a certain range along the bottom of the prefabricated structure, and can also be carried out completely in the annular closed structure. As shown in fig. 4, a center point 100 is determined, and then a preset segment full ring contour line 200 is drawn on site in combination with a design drawing and a measuring device, wherein the specific contour line can be an inner edge line, a center line or an outer edge line.

And (3) bottom template installation: according to the arrangement of the prefabricated positioning structure according to the center point 100 and the preset segment full-circle outline 200 shown in fig. 4, the base 1 and the bottom template 2 can be arranged, the base 1 and the bottom template 2 extend along the preset segment full-circle outline 200, the local structure is as shown in fig. 5 (a), 6 (a) and 7 (a), and the bottom template 2 is fixed on the base 1 by adopting necessary fixing measures.

And (3) inner side template installation: as shown in fig. 5 (b), 6 (b) and 7 (b), an inner side template 3 is installed on the base 1, the inner side template 3 is vertically arranged, the inner side template 3 and the bottom template 2 can be fixed by gluing, welding or installing a locking pin block, and the inner side template 3 is also arranged along the preset segment whole ring contour line 200 in an extending manner. And then the back ridge 5 is arranged on the inner side of the inner side template 3, and finally the internal diagonal braces 7 are arranged at intervals according to the requirement, so that the stability of the whole structure of the inner side template 3 is improved. The inner side of the inner side form 3 herein means the inner side of the inner side form after the inner side form is surrounded into a ring shape, and the ring-shaped inner side is the inner side of the inner side form.

And (3) skeleton installation: as shown in fig. 5 (c), 6 (c), 7 (c), 5 (d), 6 (d) and 7 (d), the end plates 11 are fixedly assembled together in pairs by bolts to form a plurality of end plate groups, the end plate groups are sequentially arranged along a preset segment whole ring contour line 200, then an intermediate steel skeleton is fixedly arranged between the two end plate groups arranged at any interval, the intermediate steel skeleton comprises steel sections 10, the steel sections 10 extend along the separating length direction, the steel sections 10 are specifically i-shaped steel, in the embodiment, two steel sections 10 between any two adjacent end plate groups are arranged at intervals along the up-down direction, and two ends of each steel section 10 are correspondingly welded with the corresponding end plate 11. And, the middle steel skeleton further includes a plurality of longitudinal bars 90 welded with the section steel 10, if a direction of the segment block 300 in fig. 1, which is consistent with the extending direction of the corresponding tunnel, is defined as a block width direction, each longitudinal bar 90 extends along the block width direction, a plurality of longitudinal bars 90 are distributed at intervals along the block length direction, and the longitudinal bars 90 are welded with the section steel 10, so as to improve the structural strength of the middle steel skeleton.

It should be noted that the end plate group may be vertical or inclined, and may be arranged according to actual needs.

The above-mentioned i-steel is horizontally arranged, the web plate of the i-steel is horizontally arranged, and a plurality of blanking holes 10-1 are sequentially and alternately arranged on the web plate of the i-steel along the preset segment whole ring contour line 200, and are used for the poured concrete to flow into the lower part of the section steel 10.

In fact, for the upper and lower layer of section steel 10, the vertical positions of the blanking holes 10-1 are kept consistent, so that the blanking holes 10-1 on the upper and lower layer of section steel 10 are correspondingly communicated with each other, the blanking holes 10-1 also have set apertures for the vibrating bars to pass through, and the vibrating bars are used for the blanking holes 10-1 to be placed into the vibrating bars to vibrate to the bottom of the pouring ring cavity tightly until the concrete pouring is completed. The set aperture is large enough to ensure that the vibrating rod can pass through normally.

All the end plate groups are fixedly assembled together through the middle steel framework to form a whole. The whole formed by the end plate group and the middle steel skeleton is arranged outside the inner template 3. As shown in fig. 5 (d), after the framework installation is completed, stirrups, spiral ribs of the lifting holes, spiral ribs of the inter-ring hand holes 13, inter-block hand hole boxes 120, and the like may be welded to corresponding positions, wherein the inter-block hand hole boxes 120 are respectively fixed on opposite sides of the two end plates 11 of the end plate group corresponding to the fastening bolts 16, so that the inter-block hand hole boxes 120 are matched with the prefabricated mold to enclose a manual reserved cavity in the pouring ring cavity, and corresponding lifting holes are formed on the inner side template 3, corresponding to the spiral ribs of the lifting holes, and play a corresponding reinforcing role.

In this embodiment, the inter-block hand hole box 120 is a hexahedral shell with two open sides, one open side is welded to the bolt hole position of the end plate 11, the other open side is abutted against the inner side template 3, after the end plate 11 is connected by bolts, an expansion material is injected into the inter-block hand hole box 120 to prevent the concrete slurry from blocking the inter-block hand hole box 120 during the subsequent concrete pouring, and finally the expansion material is taken out during the form removal.

And (3) outer side template installation: as shown in fig. 5 (e), 6 (e) and 7 (e), an outer side template 4 is arranged outside the end plate group and the middle steel skeleton, the outer side template 4 is arranged vertically, and the outer side template 4 and the bottom template 2 are fixed by gluing, welding or installing a locking block and the like. And then the back ribs 5 are arranged on the outer side of the outer side template 4, and then external diagonal braces 7 are arranged at intervals according to the requirement, so that the stability of the overall structure of the outer side template 4 is improved.

Top form installation: as shown in fig. 5 (e), 6 (e) and 7 (e), the top form 2-1 is inserted between the inner form 3 and the outer form 4, and the joints of the different forms are bonded or spot welded with glue.

Finally, a lifting hole is formed in the outer side template 4, a lifting hole sleeve 14 is transversely penetrated in the lifting holes of the inner side template 3 and the outer side template 4, the sleeve is fixed, a gap between the pipe joints is filled, and the lifting hole sleeve 14 is reinforced by a lifting hole spiral rib.

According to the steps, the prefabricated mold can be assembled, the prefabricated mold integrally comprises a bottom mold plate 2, an inner mold plate 3, an outer mold plate 4 and a top mold plate 2-1 which extend along a preset segment whole ring contour line 200, the inner mold plate 3 and the outer mold plate 4 are vertically arranged, the bottom mold plate 2, the inner mold plate 3, the outer mold plate 4 and the top mold plate 2-1 are enclosed to form a pouring ring cavity for pouring concrete filling 15, a plurality of end plate groups are sequentially arranged in the pouring ring cavity at intervals along the preset segment whole ring contour line 200, each end plate group comprises two end plates 11 which are detachably and fixedly assembled together, an intermediate steel skeleton is fixedly connected between the two opposite end plates 11 of the two end plate groups which are randomly arranged at intervals, the intermediate steel skeleton extends along the preset segment whole ring contour line 200, the intermediate steel skeleton specifically comprises section steel 10 and corresponding longitudinal steel bars 90 which extend along the preset segment whole ring contour line 200, the web of the section steel 10 is horizontally arranged, a plurality of blanking holes 10-1 are sequentially distributed in the pouring ring cavity along the extending direction of the section steel 10, and the blanking holes 10-1 are sequentially distributed along the extending direction of the section steel 10, and the blanking holes 10-1 are used for entering the concrete filling direction along the blanking direction 15.

After the prefabricated mold is formed by assembly, as shown in fig. 5 (f), 6 (f) and 7 (f), a concrete filler 15 is poured in the pouring ring cavity, and when concrete is poured, the concrete is poured to the bottom of the pouring ring cavity through the blanking holes 10-1 on the section steel 10, and in the process, a vibrating rod can be lowered to the bottom of the pouring ring cavity through the blanking holes 10-1 to vibrate and compact until the concrete pouring is completed. The pipe piece structure after the mold removal is as shown in fig. 5 (g), 6 (g) and 7 (g) and fig. 1, the concrete filler 15 forms a pipe piece block 300, the end of the pipe piece block 300 is provided with end plates 11, and adjacent end plates 11 are fixedly assembled together through bolts to form an end plate group. After the duct piece reaches the set strength, the mould is removed and the corresponding two end plates 11 are timely maintained, the corresponding two end plates 11 are separated at each end plate group, the concrete body 150 formed by integrally pouring the corresponding two end plates 11 is relatively and fixedly assembled together to obtain a prefabricated plurality of duct piece segments 300, wherein the structure of one middle duct piece segment 400 is shown in fig. 8, the concrete body 150 of the middle duct piece segment 400 is provided with a hoisting hole sleeve 14, a ring piece hand hole and an inter-block hand hole 12, the corresponding two ends of the concrete body 150 are respectively integrally provided with the end plates 11, one end plate 11 is vertically arranged, the other end plate is obliquely arranged, during installation, the inter-block hand holes 12 formed on the concrete body 150 after removing the inter-block hand hole sleeve boxes 120 are utilized, two prefabricated duct piece segments 300 can be fixedly connected together through corresponding fastening bolts 16, all duct piece segments 300 are sequentially and fixedly assembled together according to a preset duct piece whole ring contour line 200, and then a related test can be performed.

The duct piece whole ring prefabrication method provided by the embodiment is flexible in prefabrication mode, is suitable for conventional or special duct pieces with different shapes and different sizes, can prefabricate the duct pieces according to actual duct piece shapes, can be round, rectangular-like, horseshoe-shaped and the like, and can prefabricate annular duct pieces with special shapes.

The prefabricated mould that adopts is comparatively convenient on the whole dismouting, and the material is easily got, and repeatedly usable, and prefabricated cost is lower relatively to, owing to be prefabricated in a concentrated way of whole ring, the prefabricated back of accomplishing is subdivided into the piece and is arranged, can effectively guarantee to assemble the precision, is suitable for being applied to in the section of jurisdiction prefabrication scene of full-length test.

The concrete example 2 of the segment whole ring prefabrication method provided by the invention is as follows:

it differs from the examples mainly in that: in example 1, the section steel is specifically i-steel. In this embodiment, the section steel may be H-section steel, at this time, the web of the H-section steel may also be arranged horizontally, and a blanking hole is provided on the web of the H-section steel for the concrete filler to pass through.

Of course, in other embodiments, other sections, such as angle steel, may be used.

The concrete example 3 of the segment whole ring prefabrication method provided by the invention is as follows:

it differs from the examples mainly in that: in example 1, after the inner form was installed, the end plate and the intermediate steel skeleton were installed first, and then the outer form was installed. In the embodiment, the outer side template can be installed first after the inner side template is installed, and the end plate and the middle steel skeleton which are fixedly assembled together can be hoisted and put into the formed annular groove from top to bottom, so that the installation is relatively inconvenient.

The embodiment 4 of the segment whole ring prefabrication method provided by the invention comprises the following steps:

the differences from example 1 are mainly that: in embodiment 1, the intermediate steel skeleton includes a section steel. In the present embodiment, the section steel is omitted, and as shown in fig. 9, a reinforcement cage 9 is provided in the concrete body 150, and the reinforcement cage 9 is used as an intermediate steel skeleton.

It should be noted that the segment whole ring prefabrication method provided by the invention not only can be applied to segment prefabrication in full-scale experiments, but also can be applied to segment prefabrication in other scenes, such as a reduced scale experiment and normal segment trial production.

It should be noted that the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, but may be modified without inventive effort or equivalent substitution of some technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a section of jurisdiction full circle structure which characterized in that includes:

the duct piece segments (300) are sequentially in butt joint arrangement along a preset duct piece whole ring contour line (200), and the direction, which is the same as the extending direction of the preset duct piece whole ring contour line (200), on the duct piece segments (300) is defined as the length direction of the segments;

each segment block (300) comprises two end plates (11) which are distributed at intervals along the preset segment whole ring contour line (200), and a concrete body (150) which is positioned between the two end plates (11) and is integrally cast with the two end plates (11), wherein a middle steel skeleton is arranged in the concrete body (150), extends along the length direction of the segment, and in the same segment block (300), two ends of the middle steel skeleton in the length direction of the segment block are in welding connection with the corresponding two end plates (11) in a one-to-one correspondence manner;

bolt mounting holes are respectively formed in the two end plates (11) of each segment block (300), and inter-block hand holes (12) are formed in the concrete body (150) corresponding to the bolt mounting holes;

in the extending direction of a preset duct piece whole ring contour line (200), two end plates (11) at two opposite ends of any two adjacent duct piece blocks (300) are attached, fastening bolts (16) are penetrated and installed in bolt installation holes on the two correspondingly attached end plates (11) through inter-block hand holes (12) on the duct piece blocks (300), so that the two duct piece blocks (300) are fixedly assembled together through the fastening bolts (16), and further a duct piece whole ring structure is formed;

the middle steel skeleton of each segment block (300) comprises a section steel (10) extending along the length direction of the segment, a plurality of blanking holes (10-1) are sequentially arranged on the section steel (10) along the length direction of the segment, the direction of the segment block (300) consistent with the extending direction of the corresponding tunnel is defined as the width direction of the segment, and each blanking hole (10-1) penetrates through the corresponding section steel (10) along the width direction of the segment so as to allow concrete slurry to enter the lower part of the corresponding section steel (10) when concrete pouring is performed.

2. The pipe segment whole ring structure according to claim 1, wherein the middle steel skeleton of each pipe segment (300) further comprises a plurality of longitudinal steel bars (90) welded with the section steel (10), the longitudinal steel bars (90) extend along the width direction of the segment, and the longitudinal steel bars (90) are distributed at intervals along the length direction of the segment.

3. The pipe segment whole ring structure according to claim 2, wherein the section steel (10) is distributed with more than two sections at intervals in the block width direction, and a plurality of blanking holes (10-1) are sequentially arranged on each section steel (10) along the block length direction.

4. A segment whole ring structure according to claim 1 or 2 or 3, wherein the cross section of the inter-block hand hole (12) in the block length direction is rectangular or trapezoidal.

5. The segment whole ring prefabrication method is characterized by comprising the following steps of:

step one, assembling a prefabricated mold;

assembling a prefabricated die according to a preset duct piece whole ring contour line (200), enclosing a pouring ring cavity by a bottom die plate (2), an inner die plate (3), an outer die plate (4) and a top die plate (2-1) of the prefabricated die, sequentially arranging a plurality of end plate groups along the preset duct piece whole ring contour line (200) in the pouring ring cavity, wherein each end plate group comprises two end plates (11) which are detachably and fixedly assembled together through fastening bolts (16), inter-block hand hole boxes (120) are respectively and fixedly arranged on two opposite sides of each end plate (11) of each end plate group corresponding to the fastening bolts (16), and the inter-block hand hole boxes (120) are matched with the prefabricated die to enclose a manual reserved cavity in the pouring ring cavity, and any two adjacent end plate groups are respectively and fixedly assembled together through an intermediate steel skeleton;

step two, pouring concrete in the pouring annular cavity;

removing the mould, maintaining, separating corresponding two end plates (11) at each end plate group, and relatively and fixedly assembling concrete bodies (150) formed by integrally pouring the corresponding two end plates (11) together to obtain prefabricated pipe segment blocks (300), wherein any prefabricated two pipe segment blocks (300) can be fixedly connected together through corresponding fastening bolts (16) by utilizing inter-block hand holes (12) formed on the concrete bodies (150) after removing inter-block hand hole boxes (120), and all pipe segment blocks (300) are sequentially and fixedly assembled together according to preset pipe segment whole ring contour lines (200), so that a pipe segment whole ring structure can be formed;

the middle steel skeleton comprises a section steel (10) which is arranged along a preset segment whole ring contour line (200), blanking holes (10-1) are sequentially arranged on the section steel (10) along the length direction of the section steel, the blanking holes (10-1) extend along the up-down direction, and when concrete is poured in the second step, concrete slurry enters the lower portion of the section steel (10) through the blanking holes (10-1).

6. The pipe segment full ring prefabrication method according to claim 5, wherein in the first step, the bottom template (2), the inner template (3), the outer template (4) and the top template (2-1) are sequentially arranged, wherein the bottom template (2), the inner template (3), the outer template (4) and the top template (2-1) all extend along a preset pipe segment full ring contour line (200), and after the inner template (3) is arranged, the end plate group and the middle steel skeleton are arranged outside the inner template (3) along the preset pipe segment full ring contour line (200), and then the outer template (4) is arranged.

7. The segment whole ring prefabrication method according to claim 6, wherein a plurality of blanking holes (10-1) are sequentially arranged on the section steel (10) along the length direction of the section steel, and each blanking hole (10-1) extends along the up-down direction.

8. The segment whole ring prefabrication method according to claim 7, wherein the section steel (10) is i-steel or H-steel, the section steel (10) has a web, the web of the section steel (10) is horizontally arranged, and a plurality of blanking holes (10-1) are sequentially and alternately distributed on the web of the section steel (10) along the extending direction of the section steel (10).

9. The segment whole ring prefabrication method according to claim 7 or 8, wherein the blanking hole (10-1) has a set aperture, and in the second step, a vibrating rod is put into the bottom of the pouring ring cavity through the blanking hole (10-1) to vibrate and compact until the concrete pouring is completed.

10. The segment whole ring prefabrication method according to claim 6, 7 or 8, wherein in step one, the inter-block hand hole boxes (120) are filled with an expansion material, preventing concrete slurry from blocking the inter-block hand hole boxes (120) during subsequent concrete casting.