CN115198791A - Bottom grouting process for mounting lower structural member of large-diameter shield tunnel - Google Patents
Bottom grouting process for mounting lower structural member of large-diameter shield tunnel Download PDFInfo
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- CN115198791A CN115198791A CN202210553155.2A CN202210553155A CN115198791A CN 115198791 A CN115198791 A CN 115198791A CN 202210553155 A CN202210553155 A CN 202210553155A CN 115198791 A CN115198791 A CN 115198791A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims description 43
- 238000005266 casting Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 238000009434 installation Methods 0.000 claims description 11
- 239000011440 grout Substances 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 2
- 230000007306 turnover Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 22
- 239000002699 waste material Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000003973 irrigation Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Geochemistry & Mineralogy (AREA)
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- Lining And Supports For Tunnels (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a bottom grouting process for mounting a lower structural member of a large-diameter shield tunnel, which comprises the following steps of: s1, opening plugging, wherein pressure sensors are arranged on arc opening plugging devices, a splicing seam is formed between each arc piece and a segment, a plurality of splicing seams form a pouring seam, and a slurry sensor is arranged in the pouring seam; s2, pouring concrete, namely injecting the concrete from an open position on one side, and synchronously carrying out compactness detection, wherein the compactness detection comprises grouting liquid level monitoring and stress monitoring. The invention can perform pouring joint grouting formed between a plurality of arc-shaped pieces and the duct piece at one time, has higher construction efficiency, can ensure that the compactness of the concrete after grouting meets the requirement under the liquid level monitoring and stress monitoring, simultaneously reduces the waste rate of the concrete, reduces the occurrence probability of cold joint phenomenon during construction, and can not cause the lifting of the arc-shaped pieces during pouring and the uneven settlement of the road surface during later operation.
Description
Technical Field
The invention belongs to the technical field of shield tunnel construction, and particularly relates to a bottom grouting process for mounting a lower structural member of a large-diameter shield tunnel.
Background
In recent years, with the rapid development of urban rail transit and large-scale underwater tunnels, the shield method becomes a preferred mode for building urban main-flow tunnels due to the advantages of rapid construction, no influence on ground traffic, better control of ground settlement and the like. Particularly, in the direction of a large-diameter shield tunnel, with the increasing prefabrication and assembly degree, the existing engineering of the lower part component of the shield tunnel adopts a full prefabricated structure with quicker construction and more environmental protection.
At present, middle box culvert and cast-in-place limit box culvert structure have directly been replaced to prefabricated arc spare, and for convenient installation and construction, the inside formation of prefabricated arc spare runs through the chamber, the bottom forms the arc opening, during the installation, erect on the section of jurisdiction in tunnel from the bottom surface of prefabricated arc spare, form the concatenation seam between the periphery of prefabricated arc spare and the section of jurisdiction inner wall, consequently, need grout and pour, in order to ensure the stability of lower part structure installation, so, need be with the tip shutoff of arc opening and prefabricated arc spare, then grout.
However, during the grouting and pouring process, the following technical problems exist:
1) When the arc-shaped opening and the end part of the prefabricated arc-shaped part are plugged, once the plugging sealing effect is poor, slurry leakage or slurry leakage is easily caused, the compactness of pouring construction is influenced, and concrete waste is caused;
2) Because the center of prefabricated arc spare of space restriction and assembly back aligns the restriction, the trucd mixer hardly leans on the limit to unload, causes the concrete to hardly accurately fall into the concatenation gap, consequently, can appear closely knit not enough easily in pouring once, if the improper (if: the continuous casting cannot be carried out), the occurrence probability of the cold joint phenomenon can be greatly increased, and further later-period cracking is caused, so that the installation quality of the lower component is influenced;
3) The gap width that leaves between every lower part component and the section of jurisdiction is great, consequently, the theoretical grout volume in every section gap is great, and the grout volume is not good to be held during the grout, if overfill, can cause the lifting of lower part component, if fill not full, can cause inhomogeneous filling, can arouse the road surface differential settlement in later stage operation, above two kinds of circumstances all can cause the wrong platform of lower part component vertical direction, influence follow-up mid-board construction, also can influence follow-up the operation of making a track.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an improved bottom grouting process for mounting a lower structural part of a large-diameter shield tunnel.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a bottom grouting process of installation usefulness of major diameter shield tunnel lower part structure, lower part structure is including having the arc piece that link up chamber and arc open-ended, and wherein the arc opening is located the bottom of arc piece, and with link up the chamber intercommunication, bottom grouting process includes following step:
s1, opening plugging, which comprises plugging of an opening at the bottom of an arc-shaped piece and plugging of the end part of the arc-shaped piece, wherein a pouring seam with two open sides is formed between the two sides of the arc-shaped piece and a duct piece;
s2, pouring concrete, wherein the concrete is poured from an open position on one side, and the concrete pouring device is characterized in that:
in S1, when bottom opening plugging is implemented, each adopted arc opening plugging device is provided with a pressure sensor, a splicing seam is formed between each arc piece and a duct piece, a plurality of splicing seams form a pouring seam, and a slurry sensor is arranged in the pouring seam;
in S2 pouring, compactness detection is required to be synchronously performed, wherein the compactness detection comprises the following steps: 1) Monitoring the grouting liquid level, namely acquiring the liquid level information of the poured concrete through the slurry sensor and controlling the grouting amount; 2) And stress monitoring, wherein a stress value F of the bottom opening of each arc-shaped part is obtained through a pressure sensor 1 …F N And give F Flat plate Then, it is calculated according to the following formula:
F＝0.22γ c t 0 β 1 β 2 V 1/2 formula 1
In formula 1, F is the pressure of the newly poured concrete to the plugging device, and the unit is: kN/m 2 ；γ c Is the gravity density of the concrete, with the unit: kN/m 3 (ii) a V is the pouring speed of the concrete, and the unit is as follows: m/h; t is t 0 The initial setting time of newly poured concrete is as follows: h, beta 1 The additive influences the correction coefficient and is 1.0-1.2; beta is a beta 2 Is a correction coefficient of the concrete slump and is 0.85-1.15; respectively calculating the pressure value at the bottom opening of each arc-shaped part and obtaining an average value F Pressing and pressing And | (F) Flat plate -F Press and press )/F Press and press The | < 5%, if the ratio exceeds 5%, the pulp needs to be supplemented.
Preferably, the pressure sensor obtains the pressure value Fmax with the maximum stress value at the bottom opening of the arc-shaped part, if (Fmax-F) Press and press )/F Press and press If the voltage is more than 30%, the pressure sensor is damaged, the data of Fmax are removed, and F is obtained again Flat plate . In this way, data that is significantly erroneous can be culled to ensure the accuracy of the data obtained.
Preferably, in the above formula, t 0 = 200/(T + 15), and T is the temperature at which the concrete is poured. Once the initial setting time is uncertain, the pressure can be obtained through the formula, so that the pressure is convenientAnd (6) detecting.
According to a specific implementation and preferred aspect of the invention, the slurry sensors are divided into a plurality of groups and are distributed at intervals along the length direction of the shield tunnel, wherein each group of slurry sensors corresponds to one casting section, each casting section is grouted, grouting of the lower casting section is continued until grouting of a casting joint is completed, and F is obtained after all grouting is completed simultaneously Flat plate And F Press and press The value of (c). And the casting is carried out in a section-by-section propelling mode, so that the condition that the grouting efficiency is influenced by wrong instructions of the slurry sensor is avoided, and the accuracy of a monitoring result is ensured after all grouting of a casting joint is finished.
Preferably, each group of mud sensors is provided with a plurality of mud sensors, two mud sensors are located on two sides of the pouring section, the rest mud sensors are located between the two mud sensors, each mud sensor is arranged on the bottom surface of the arc-shaped part or/and the arc-shaped surface of the duct piece, and after the plurality of mud sensors are all in contact with concrete, grouting of the corresponding pouring section is stopped. The direct benefit is to avoid over-irrigation, but this measure only allows observation of the overall irrigation level, and does not allow detection of local compaction.
Further, the compactness detection also comprises radar detection, wherein the poured concrete is scanned through a radar, and imaging is carried out to detect the grouting compactness. Further verifying the grouting quality and ensuring the grouting quality.
According to still another specific implementation and preferred aspect of the invention, β is when the slump is less than 30mm 2 Taking 0.85-0.95 percent; beta when the slump is 30-90 mm 2 Taking 1.0-1.1; when the slump is 90-150 mm, beta 2 Taking 1.10-1.15. Since slump directly affects the fluidity of the grouted concrete.
According to a further embodied and preferred aspect of the invention, the pressure value of F can also be calculated by the following formula:
F＝γ c h formula 2
H in the formula 2 is the total height from the concrete pressure calculation position to the top surface of the newly poured concrete, and the unit is: m, gamma c Is the gravity density of the concrete inComprises the following steps: kN/m 3 . By adopting the data obtained by the formula 2, the result of the formula 1 can be further verified, so that the grouting compactness can meet the actual requirement.
According to a further embodied and preferred aspect of the invention, an arcuate opening closure device is located within the through-cavity and closes off the arcuate opening of the arcuate member, and comprises:
the arc-shaped plugging plate comprises an arc-shaped plate body which is attached to the inner wall of the bottom of the through cavity and covers the arc-shaped opening;
the sealing piece extends along the periphery of the arc-shaped opening and is attached to the bottom surface of the arc-shaped plate body;
the top supporting piece comprises a supporting frame arranged on the top surface of the arc-shaped plate body, supporting rods arranged on the supporting frame and top supporting feet arranged on the supporting rods, wherein the supporting frame comprises a frame rod which is parallel to or/and intersected with the arc-shaped opening, the number of the supporting rods is multiple, the supporting rods are distributed between the frame rod and the inner wall of the top of the through cavity at intervals by taking the arc-shaped opening as a reference, the top supporting feet are in one-to-one correspondence with the supporting rods, and can move along the length direction of the supporting rods to be separated from or top-supported on the inner wall of the top of the through cavity in an adjusting manner;
and the pressure sensors are arranged on the arc-shaped plugging plate and are distributed at intervals in the circumferential direction of the arc-shaped opening.
Here, through the laminating of covering of arc body and sealing member to use the arc opening as the benchmark, through the even shore that inside provided, reinforcing arc open-ended shutoff effect is pour for the high-quality and is provided the prerequisite, also avoids the waste of concrete, need not pre-buried or to arc spare postprocessing simultaneously, can implement the dismouting in narrow and small space.
Preferably, the frame rod comprises a plurality of arc-shaped supporting rods extending along the length direction of the arc-shaped opening and a plurality of connecting supporting rods transversely arranged between every two adjacent arc-shaped supporting rods, wherein the plurality of arc-shaped supporting rods and the plurality of connecting supporting rods are intersected to form a frame net area to cover the arc-shaped opening, and the pressure sensor is arranged at the position of the supporting rod. Therefore, the jacking force is further ensured to be uniform, the pouring quality is ensured, and the pressure is conveniently obtained.
According to a specific implementation and preferred aspect of the invention, the two arc-shaped supporting rods are arranged on two sides of the arc-shaped opening in parallel, the connecting supporting rod is transversely arranged between the two arc-shaped supporting rods, and the supporting rod is arranged on the connecting supporting rod or/and the arc-shaped supporting rod. The rod-shaped structure is optimized, and the field installation is further facilitated.
Preferably, the vaulting pole has four, and around the circumference distribution of arc opening in four corners, the top sprag foot is installed at the top of vaulting pole. The sealed effect of shutoff is ensured in cooperation arc laminating and vaulting pole conflict.
Specifically, each support rod is vertically arranged on the arc-shaped support rod from the lower end part, and the upper end part extends towards the inner wall of the top of the through cavity.
According to a further embodiment and preferred aspect of the invention, each strut is telescopically adjustable along its length. Therefore, according to the heights of different through cavities, the arc-shaped openings corresponding to the through cavities can be plugged.
Preferably, the top support piece further comprises two reinforcing rods extending along the width direction of the arc-shaped opening, wherein each reinforcing rod is used for connecting the supporting rods positioned at two sides of the arc-shaped opening. The top support is ensured to be firm.
Preferably, the arc-shaped plate body is an arc-shaped steel plate, and the shape of the arc-shaped plate body is similar to that of the arc-shaped opening. Make things convenient for the block structure simplification, also be convenient for simultaneously arc steel sheet and arc open-ended center align.
Preferably, the top brace includes a brace body, a brace rod, and an adjustment portion, wherein the adjustment portion is operated such that the brace rod extends out of or retracts into the brace body. And the support is implemented under the motion of the supporting leg rod, so that high-quality plugging is completed.
In addition, the sealing member is a rubber pad and is arranged in alignment with the outer contour of the arc-shaped plate body. The sealing effect is ensured, and the implementation is convenient.
According to a further embodiment and preferred aspect of the present invention, grouting is performed in S2 using a concrete chute structure comprising:
the base comprises a chassis frame and a support frame arranged on the chassis frame;
the concrete chute comprises a chute body forming a long strip-shaped discharging channel, wherein the chute body is provided with a discharging opening and a feeding opening, the chute body is obliquely arranged on the supporting frame from the feeding opening to the upper part and from the discharging opening to the lower part, and the discharging opening obliquely extends inwards from top to bottom;
the discharging baffle is erected at a discharging opening of the chute body in a turnover mode through a pivot extending around the width direction of the chute body and has an opening state and an intercepting state, when the discharging baffle is in the opening state, concrete pushes the discharging baffle to turn upwards around the pivot, the discharging baffle and the discharging opening form an opening to be discharged into a slot of a prefabricated arc-shaped piece and a slot piece, and the size of the opening is in direct proportion to the flow rate of the concrete; in the intercepting state, the discharging baffle turns around the pivot under the self-weight and closes the opening. Through the cooperation of the concrete chute and the discharging baffle, the concrete of the mixer truck can be accurately guided and unloaded to the slot to be poured, the unloading flow is controllable, the probability of insufficient compactness and cold joint phenomenon in pouring is reduced, the installation quality of lower components is improved, the waste of the concrete is avoided, and the subsequent cleaning workload is reduced.
Preferably, the support frame can stretch out and draw back the setting from top to bottom, and the chute body articulates at the top of support frame from the bottom. Therefore, the unloading of the concrete under different heights can be met by vertically adjusting the support frame.
According to a specific implementation and preferable aspect of the invention, the supporting frame comprises two groups of telescopic supporting rods which are distributed at intervals along the length direction of the chute body, wherein the two groups of telescopic supporting rods can lift and lower to adjust the height or/and the angle of the chute body. That is to say, when going up and down simultaneously, can height-adjusting, can change chute body inclination under the regulation that the height-adjusting is inconsistent to satisfy the use needs under the different operating modes, strengthen the practicality of concrete chute structure.
Preferably, each group of telescopic supporting rods is synchronously adjusted in a telescopic mode, wherein each group of telescopic supporting rods is at least composed of two telescopic supporting rods which are distributed at intervals along the width direction of the chute body. Making the support more stable.
According to yet another specific embodiment and preferred aspect of the present invention, the chute body comprises an obliquely disposed trough bottom panel, trough side panels extending upwardly from both sides of the trough bottom panel, wherein an open-topped discharge channel is defined between the trough bottom panel and the two side trough side panels, and wherein the discharge channel defines a feed opening in an upper portion thereof and a discharge opening in a lower portion thereof. The chute body structure is very convenient to machine and form, and can visually observe the concrete flow in the discharging channel, so that pouring construction is facilitated.
Preferably, two pivot shafts are respectively arranged at two sides of the discharging baffle plate, wherein each pivot shaft is rotatably connected with the corresponding side groove side plate, and when in the intercepting state, the discharging baffle plate is erected at the lower end part of the groove bottom plate from the lower part. Convenient equipment can control the flow of concreting moreover effectively.
Further, the pivot is positioned at the upper part of the discharging baffle. The overturning operation of the discharging baffle is more facilitated.
Specifically, the groove side plates on the two sides are arranged in parallel and are perpendicular to the groove bottom plate respectively, the two sides of the discharging baffle are in clearance fit with the inner walls of the groove side plates, and the feeding port and the discharging port are symmetrically arranged. The shaping is convenient, can avoid moreover the baffle upset motion of unloading to form the obstacle.
According to a further embodiment and preferred aspect of the invention, a detachable counterweight module is also provided on the discharge flap. Thus, the opening can be closed at any time according to the site construction condition, so that the site construction requirement can be met.
In addition, still be equipped with universal pulley in the bottom of chassis underframe, conveniently implement the concrete chute structure and shift along tunnel length direction and pour.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
the method disclosed by the invention can be used for grouting the pouring seams formed between the arc-shaped pieces and the duct pieces at one time, has higher construction efficiency, can ensure that the compactness of the concrete after grouting meets the requirements under the liquid level monitoring and the stress monitoring, simultaneously reduces the waste rate of the concrete, reduces the occurrence probability of cold joint phenomenon in construction, and in addition, the arc-shaped pieces cannot be lifted in the pouring process, and the uneven settlement of the pavement cannot be caused in the later operation, so that the vertical dislocation of the arc-shaped pieces cannot be caused, and the construction of a subsequent tunnel is facilitated.
Drawings
FIG. 1 is a schematic flow chart of the middle bottom grouting process in this example 1;
FIG. 2 is a schematic structural view of an arc-shaped member according to the embodiment 1;
fig. 3 is a schematic view of the arc-shaped opening blocking device of the embodiment 1 in a blocking state;
fig. 4 is a schematic structural diagram of an arc-shaped opening blocking device in the embodiment 1;
FIG. 5 is a schematic front view of FIG. 4;
FIG. 6 is an enlarged top view of FIG. 5 (with the top brace omitted);
FIG. 7 is an enlarged bottom view of FIG. 5;
fig. 8 is a schematic structural view of the concrete chute structure of this example 1 (the discharge flapper is in an open state);
fig. 9 is a schematic front view of the concrete chute structure of this example 1 (the discharge gate is in an intercepting state);
wherein: 1. an arcuate member; 10. a through cavity; 11. an arc-shaped opening; 2. an arc-shaped plugging plate; 20. an arc plate body; 3. a seal member; 4. a top support; 40. a support frame; 400. a frame bar; a. an arc-shaped support rod; b. connecting a support rod; 41. a stay bar; 42. a top brace; 420. a brace body; 421. a temple bar; 422. an adjustment section; 43. a reinforcing rod; a1, a base; a10, a chassis frame; a11, a support frame; 110. a telescopic support rod; a2, a concrete chute; a20, a chute body; 20a, a discharge opening; 20b, a feed inlet; 200. a trough floor; 201. a trough side plate; a3, a discharging baffle; s, a pivot; a4, a counterweight module; a5, universal pulleys.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Example 1
As shown in fig. 1 and 2, the lower structural member comprises an arcuate member 1 having a through cavity 10 and an arcuate opening 11, wherein the arcuate opening 11 is located at the bottom of the arcuate member 1 and communicates with the through cavity 10.
The bottom grouting process for mounting the lower structural member of the large-diameter shield tunnel comprises the following steps of:
s1, opening plugging, which comprises plugging of an opening (a shape opening 11) at the bottom of an arc-shaped piece 1 and plugging of the end part of the arc-shaped piece 1, wherein a pouring seam with two open sides is formed between the two sides of the arc-shaped piece 1 and a duct piece;
and S2, pouring concrete, wherein the concrete is poured from an open position on one side.
Specifically, in S1, when the bottom opening is sealed, the adopted arc opening sealing device is located in the through cavity 10 and seals the arc opening 11 of the arc member, and in this example, the arc opening sealing device includes an arc sealing plate 2, a sealing member 3, a top support member 4, and a pressure sensor.
Specifically, the arc-shaped plugging plate 2 comprises an arc-shaped plate body 20 which is attached to the inner wall of the bottom of the through cavity 10 and covers the arc-shaped opening 11.
The arc plate body 20 is an arc steel plate, and the shape is similar to the shape of the arc opening 11. Make things convenient for the block structure simplification, also be convenient for simultaneously arc steel sheet and arc open-ended center align.
As shown in fig. 3, the top stay 4 includes a supporting frame 40 mounted on the top surface of the arc plate body 20, a stay 41 mounted on the supporting frame 40, a top supporting foot 42 mounted on the stay 41, and a reinforcing rod 43.
The support frame 40 comprises a frame rod 400 which is arranged in parallel and intersected with the arc-shaped opening, wherein the frame rod 400 comprises two arc-shaped supporting rods a which extend along the length direction of the arc-shaped opening and a connecting supporting rod b which is transversely arranged between the two arc-shaped supporting rods a.
The two arc-shaped supporting rods a and the connecting supporting rods b are intersected to form a net erecting area to cover the arc-shaped opening. Thus, the uniform jacking force is further ensured, and the pouring quality is ensured.
Two arc-shaped supporting rods a are arranged on two sides of the arc-shaped opening in parallel, a connecting supporting rod b is transversely arranged between the two arc-shaped supporting rods a, and a supporting rod 41 is arranged on the arc-shaped supporting rod a. The rod-shaped structure is optimized, and the field installation is further facilitated.
In this example, four struts 41 are provided and are arranged at four corners around the circumference of the arc-shaped opening. The sealed effect of shutoff is ensured to cooperation arc laminating and vaulting pole conflict.
The top supporting feet 42 are arranged at the tops of the supporting rods 41, the top supporting feet 42 correspond to the supporting rods 41 one by one, and can move along the length direction of the supporting rods 41 to be separated from or supported on the inner wall of the top of the through cavity in a supporting mode.
Specifically, the pressure sensors correspond to the support rods one by one and are arranged at the bottoms of the arc-shaped steel plates where the support rods are located.
In particular, as shown in fig. 4 and 5, each strut 41 is vertically mounted on the arc-shaped strut a from the lower end portion, and the upper end portion extends toward the inner wall of the top of the through cavity.
Each support rod 41 can be telescopically adjusted and arranged along the length direction of the support rod. Therefore, according to the heights of different through cavities, the arc-shaped openings corresponding to the through cavities can be plugged.
The supporting foot 42 comprises a supporting foot body 420, a supporting foot rod 421 and an adjusting portion 422, wherein the adjusting portion 422 is operated (for example, directly turning to the adjusting portion 422, and screwing in or out through the threaded fit between the supporting foot rod 421 and the supporting foot body 420), and the supporting foot rod 421 passes through or retracts into the supporting foot body 420 from the supporting foot body 420. And the support is implemented under the motion of the supporting leg rod, so that high-quality plugging is completed.
The two reinforcing rods 43 extend along the width direction of the arc-shaped opening, wherein each reinforcing rod 43 connects the supporting rods 41 at both sides of the arc-shaped opening. The top support is ensured to be firm.
As shown in fig. 6 and 7, the sealing member 3 extends along the periphery of the arc-shaped opening and is attached to the bottom surface of the arc-shaped plate body 20.
Specifically, the sealing member 3 is a rubber pad and is aligned with the outer contour of the arc-shaped plate body. The sealing effect is ensured, and the implementation is convenient.
A splicing seam is formed between each arc-shaped piece and the duct piece, a pouring seam is formed by a plurality of splicing seams, and a slurry sensor is arranged in the pouring seam.
The slurry sensors are divided into a plurality of groups and are distributed at intervals along the length direction of the shield tunnel, each group of slurry sensors corresponds to one casting section, and after each casting section finishes grouting, grouting of the lower casting section is continued until grouting of a casting joint is finished. And a section-by-section propelling mode is adopted for pouring, so that the phenomenon that the slurry sensor has wrong instructions to influence the grouting efficiency is avoided.
Preferably, there are a plurality of each group of mud sensors, and wherein two mud sensors are located the both sides of pouring the section, and remaining mud sensor is located between two mud sensors, and every mud sensor sets up the bottom surface at the arc piece or/and the arc surface of section of jurisdiction, and wherein a plurality of mud sensors all contact behind the concrete, stop the grout of the section of pouring that corresponds. The direct benefit is to avoid over-irrigation, but this measure only allows observation of the overall irrigation level, and does not allow detection of local compaction.
In S2' S pouring, need carry out the compactness in step and detect, wherein the compactness detects and includes: 1) Monitoring the grouting liquid level, wherein the liquid level information of the poured concrete is acquired through the mud sensor, and the grouting amount is controlled; 2) Stress monitoring, wherein a stress value F at the bottom opening of each arc-shaped part is obtained through a pressure sensor 1 …F N And give F Flat plate Then, it is calculated according to the following formula:
F＝0.22γ c t 0 β 1 β 2 V 1/2 formula 1
In formula 1, F is the pressure of the newly poured concrete to the plugging device, and the unit is: kN/m 2 ；γ c Is the gravity density of the concrete, with the unit: kN/m 3 (ii) a V is the pouring speed of the concrete, and the unit is as follows: m/h; t is t 0 The initial setting time of newly poured concrete is as follows: h, beta 1 The additive influences the correction coefficient and is 1.0 to 1.2; beta is a beta 2 The correction coefficient of the concrete slump is 0.85-1.15; respectively calculating the pressure value at the bottom opening of each arc-shaped part and obtaining an average value F Press and press And | (F) Flat plate -F Press and press )/F Pressing and pressing The | < 5%, if the ratio exceeds 5%, the pulp needs to be supplemented.
In particular, γ c 、V、t 0 、β 1 、β 2 The F pressure value is known, so that the F pressure value can be easily obtained, and the pressure of concrete at the pouring seam on the arc-shaped steel plate can be judged under the comparison of the actual measurement value and the calculated value, so that the compactness can be obtained.
In the above formula 1, t 0 = 200/(T + 15), and T is the temperature at which the concrete is poured. Once the initial setting time is uncertain, the initial setting time can be obtained through the formula, and pressure detection is further facilitated.
When the slump is less than 30mm, beta 2 Taking 0.85; beta when the slump is 30-90 mm 2 Taking 1.0; when the slump is 90-15At 0mm,. Beta 2 1.15 was taken. Since slump directly affects the fluidity of the grouted concrete.
As regards the admixture, the concrete must contain the admixture, otherwise it would easily coagulate and would not be transported, so that β 2 Take 1.2.
Simultaneously closely knit degree detects still includes 3), radar detection, wherein scans the concrete of pouring through the radar, forms images in order to carry out the detection of grout closely knit degree. Further verifying the grouting quality and ensuring the grouting quality.
In addition, the pressure value Fmax with the maximum stress value at the bottom opening of the arc-shaped part acquired by the pressure sensor is (Fmax-F) Press and press )/F Press and press If the pressure sensor is more than 30%, the pressure sensor is damaged, the data of Fmax are removed, and F is obtained again Flat plate . In this way, data that is significantly erroneous can be culled to ensure the accuracy of the data obtained.
Referring to fig. 8 and 9, the concrete chute structure for grouting includes a base A1, a concrete chute A2, and a discharge baffle A3.
The base A1 comprises a chassis frame A10 and a support frame A11 arranged on the chassis frame A10.
The concrete chute A2 comprises a chute body a20 forming a long strip-shaped discharge channel, the chute body a20 is provided with a discharge opening 20a and a feed opening 20b, and the chute body a20 is obliquely installed on a support frame a11 from the feed opening 20b at the upper part and the lower part of the discharge opening 20a, wherein the discharge opening 20a extends obliquely inwards from top to bottom.
In this example, the chute body a20 includes a chute bottom plate 200 disposed obliquely, and chute side plates 201 extending upward from both sides of the chute bottom plate 200, wherein a discharge passage with an open top is formed between the chute bottom plate 200 and the two chute side plates 201, and the upper portion of the discharge passage forms the feed opening 20b, and the lower portion thereof forms the discharge opening 20a. The chute body structure is very convenient to machine and form, and can visually observe the flow of concrete in the discharging channel, so that pouring construction is facilitated.
Specifically, the trough side plates 201 on both sides are arranged in parallel and are respectively perpendicular to the trough bottom plate 200, both sides of the discharge baffle A3 are in clearance fit with the inner walls of the trough side plates 201, and the feed inlet 20b and the discharge outlet 20a are symmetrically arranged. The shaping is convenient, can avoid moreover unloading the baffle upset motion and form the obstacle.
The discharge flapper A3 is turnably set up at the discharge opening 20a of the chute body a20 by a pivot shaft s extending in the width direction of the chute body a 20.
Two pivot shafts s are respectively arranged at two sides of the discharging baffle A3, wherein each pivot shaft s is rotatably connected with the corresponding side trough side plate 201, and when in an intercepting state, the discharging baffle A3 is erected at the lower end part of the trough bottom plate 200 from the lower part. The assembly is convenient, and the flow of the poured concrete can be effectively controlled.
In particular, the pivot s is located above the discharge flap A3. The overturning operation of the discharging baffle A3 is more facilitated.
In this example, the discharging baffle A3 has an open state and an intercepting state, wherein in the open state, the concrete pushing discharging baffle A3 turns upwards around the pivot s, and the opening formed by the discharging baffle A3 and the discharging opening 20a is discharged into the slot of the prefabricated arc-shaped piece and the duct piece, and the size of the opening is in direct proportion to the flow rate of the concrete; in the intercepting state, the discharge baffle turns around the pivot under the self-weight and closes the opening.
Meanwhile, a detachable counterweight module A4 is also arranged on the discharging baffle A3. Thus, the opening can be closed at any time according to the site construction conditions, so as to meet the site construction requirements, for example: when the displacement construction is needed, the mixer truck stops unloading and can directly displace, and the opening can be closed at the moment to avoid the concrete in the unloading channel from leaking.
In addition, in consideration of the adjustment of the angle and the height, in this example, the support frame a11 can be telescopically arranged up and down, and the chute body a20 is hinged at the top of the support frame a11 from the bottom. Therefore, the unloading of the concrete under different heights can be met by vertically adjusting the support frame.
Specifically, the supporting frame a11 includes two sets of telescopic supporting rods 110 respectively close to the feeding port 20b and the discharging port 20a, wherein the two sets of telescopic supporting rods 110 can lift and lower the chute body a20 to adjust the height or/and the angle. That is to say, when going up and down simultaneously, can height-adjusting, can change chute body inclination under the regulation that the height-adjusting is inconsistent to satisfy the use needs under the different operating modes, strengthen the practicality of concrete chute structure.
Each group of telescopic supporting rods 110 is synchronously telescopic and adjusted, wherein each group of telescopic supporting rods 110 is composed of at least two telescopic supporting rods which are distributed at intervals along the width direction of the chute body A20. Making the support more stable.
In addition, the bottom of the chassis frame A10 is also provided with a universal pulley A5, so that the concrete chute structure can be conveniently displaced and poured along the length direction of the tunnel.
Therefore, in the concrete pouring process of S2, the concrete chute structure is adopted for discharging, so that the waste of concrete is avoided, continuous pouring can be realized, and the influence of cold seams on the stability of the bottom of the lower component is avoided.
Example 2
The opening plugging and bottom grouting used in this example are basically the same as those used in example 1, except that they are different.
The pressure value of F can also be calculated by the following formula:
F＝γ c h formula 2
H in the formula 2 is the total height from the concrete pressure calculation position to the top surface of the newly poured concrete, and the unit is: m, gamma c Is the gravity density of the concrete, with the unit: kN/m 3 . By adopting the data obtained by the formula 2, the result of the formula 1 can be further verified, so that the grouting compactness can meet the actual requirement.
In conclusion, the invention has the following advantages:
1. pouring seam grouting formed between the arc-shaped pieces and the duct pieces is carried out at one time, so that the construction efficiency is high, the compactness of the concrete after grouting can be ensured to meet the requirement under the liquid level monitoring and stress monitoring, simultaneously, the waste rate of the concrete is reduced, the occurrence probability of cold joint phenomenon in construction is reduced, in addition, the arc-shaped pieces cannot be lifted in the pouring process, the uneven settlement of the pavement cannot be caused in the later operation, and therefore, the platform staggering of the arc-shaped pieces in the vertical direction cannot be caused, and the construction of a follow-up tunnel is facilitated;
2. by comparing the calculated data with the actually measured data, the pressure value information can be accurately obtained, and high-quality grouting at the bottom of the arc-shaped part can be ensured by perfecting measures such as multi-aspect verification (such as radar scanning) and slurry supplement; the construction method adopted is gradually advanced, and meanwhile, the pressure value is integrally considered, so that the accuracy of the monitoring result is high, and grouting operation is facilitated;
3. the arc-shaped plate body is covered and attached with the sealing piece, the arc-shaped opening is used as a reference, the plugging effect of the arc-shaped opening is enhanced through the uniform top support provided inside, necessary conditions are provided for high-quality pouring, waste of concrete is avoided, meanwhile, the arc-shaped piece is not required to be pre-buried or post-processed, the mounting and dismounting can be carried out in a narrow space, in addition, the top support piece is convenient to mount and dismount and can stretch out and draw back, so that the mounting requirements of different working conditions (such as different heights of the through cavity) are met, and the pressure sensor can more accurately obtain a pressure value;
4. through the cooperation of concrete chute and baffle of unloading, at a pouring in-process, not only can accurately unload the concrete of trucd mixer and unload to waiting to build the seam mouth in succession, and the uninstallation flow is controllable in addition, reduces the probability that closely knit degree is not enough and the cold joint phenomenon takes place in the pouring, promotes the installation quality of lower part component, and simultaneously, reduces the waste of concrete, reduces follow-up clearance work load, and the angle of concrete chute, height, position can both be adjusted in addition, in order to satisfy the cast in situ needs.
The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.
Claims (10)
1. The utility model provides a bottom grouting process of major diameter shield tunnel lower part structure installation usefulness, lower part structure is including having the arc piece that link up chamber and arc open-ended, wherein the arc open-end is located the bottom of arc piece, and with link up the chamber intercommunication, bottom grouting process includes following step:
s1, opening plugging, which comprises plugging of an opening at the bottom of an arc-shaped piece and plugging of the end part of the arc-shaped piece, wherein a pouring seam with two open sides is formed between the two sides of the arc-shaped piece and a duct piece;
s2, pouring of concrete, wherein the concrete is poured from an open position on one side, and the concrete pouring device is characterized in that:
in S1, when bottom opening plugging is carried out, each adopted arc opening plugging device is provided with a pressure sensor, a splicing seam is formed between each arc piece and a duct piece, a plurality of splicing seams form the pouring seam, and a slurry sensor is arranged in the pouring seam;
in S2 pouring, compactness detection is required to be synchronously performed, wherein the compactness detection comprises the following steps: 1) Monitoring the grouting liquid level, wherein the liquid level information of the poured concrete is acquired through the mud sensor, and the grouting amount is controlled; 2) Stress monitoring, wherein a stress value F at the bottom opening of each arc-shaped part is obtained through a pressure sensor 1 …F N And give F Flat plate Then, it is calculated according to the following formula:
F＝0.22γ c t 0 β 1 β 2 V 1/2 formula 1
In formula 1, F is the pressure of the newly poured concrete to the plugging device, and the unit is: kN/m 2 ；γ c Is the gravity density of the concrete, with the unit: kN/m 3 (ii) a V is the pouring speed of the concrete, and the unit is as follows: m/h; t is t 0 The initial setting time of newly poured concrete is as follows: h, beta 1 The additive influences the correction coefficient and is 1.0 to 1.2; beta is a 2 The correction coefficient of the concrete slump is 0.85-1.15; respectively calculating the pressure value at the bottom opening of each arc-shaped part and obtaining an average value F Press and press And | (F) Flat plate -F Pressing and pressing )/F Press and press The | < 5%, if the ratio exceeds 5%, the pulp needs to be supplemented.
2. The method of claim 1, wherein the lower structural member of the large-diameter shield tunnel is installedThe bottom grouting process is characterized in that: the pressure value Fmax of the maximum stress value at the opening at the bottom of the arc-shaped part, which is obtained by the pressure sensor, is equal to (Fmax-F) Pressing and pressing )/F Press and press If the pressure sensor is more than 30%, the pressure sensor is damaged, the data of Fmax are removed, and F is obtained again Flat plate 。
3. The bottom grouting process for mounting the lower structural member of the large-diameter shield tunnel according to claim 1, characterized in that: the slurry sensors are divided into a plurality of groups and are distributed at intervals along the length direction of the shield tunnel, each group of the slurry sensors corresponds to one casting section, grouting of the next casting section is continued until grouting of the casting joint is completed after each casting section completes grouting, and F is obtained after all grouting is completed simultaneously Flat plate And F Press and press The value of (c).
4. The bottom grouting process for mounting the lower structural member of the large-diameter shield tunnel according to claim 3, wherein: each group of the mud sensors are multiple, two mud sensors are located on two sides of the pouring section, the rest mud sensors are located between the two mud sensors, each mud sensor is arranged on the bottom surface of the arc-shaped part or/and the arc-shaped surface of the duct piece, and after the mud sensors are all in contact with concrete, grouting of the corresponding pouring section is stopped.
5. The bottom grouting process for mounting the lower structural member of the large-diameter shield tunnel according to claim 1, characterized in that: the compactness detection further comprises radar detection, wherein the poured concrete is scanned through a radar, and imaging is carried out to detect the grouting compactness.
6. The bottom grouting process for mounting the lower structural member of the large-diameter shield tunnel according to claim 1, characterized in that: in formula 1, t 0 = 200/(T + 15), and T is the temperature at which the concrete is poured; when the slump is less than 30mm, beta 2 Taking 0.85-0.95 percent; when it is collapsedBeta when the falling degree is 30-90 mm 2 Taking 1.0-1.1; when the slump is 90-150 mm, beta 2 Taking 1.10-1.15.
7. The bottom grouting process for installation of the lower structural member of the large-diameter shield tunnel according to any one of claims 1 to 6, wherein: the pressure value of F can also be calculated by the following formula:
F＝γ c h formula 2
H in the formula 2 is the total height from the concrete pressure calculation position to the top surface of the newly poured concrete, and the unit is: m, gamma c Is the gravity density of the concrete, with the unit: kN/m 3 。
8. The bottom grouting process for mounting the lower structural member of the large-diameter shield tunnel according to claim 1, characterized in that: arc opening plugging device is located link up the intracavity and will the arc opening shutoff of arc spare, and include:
the arc-shaped plugging plate comprises an arc-shaped plate body which is attached to the inner wall of the bottom of the through cavity and covers the arc-shaped opening;
the sealing piece extends along the periphery of the arc-shaped opening and is attached to the bottom surface of the arc-shaped plate body;
the top supporting piece comprises a supporting frame arranged on the top surface of the arc-shaped plate body, supporting rods arranged on the supporting frame and top supporting feet arranged on the supporting rods, wherein the supporting frame comprises frame rods which are parallel to or/and intersected with the arc-shaped opening, the number of the supporting rods is multiple, the supporting rods are distributed between the frame rods and the inner wall of the top of the through cavity at intervals by taking the arc-shaped opening as a reference, the top supporting feet are in one-to-one correspondence with the supporting rods, and the top supporting feet can move along the length direction of the supporting rods to be separated from or top-supported on the inner wall of the top of the through cavity in an adjusting manner;
and the pressure sensors are arranged on the arc-shaped plugging plate and are distributed at intervals in the circumferential direction of the arc-shaped opening.
9. The bottom grouting process for mounting the lower structural member of the large-diameter shield tunnel according to claim 8, wherein: the hack lever includes along many arc branch that arc opening length direction extends, violently establish every adjacent two many connecting strut between the arc branch, wherein many arc branch and many connecting strut intersect and form the frame net district will the arc opening covers, just pressure sensor sets up in vaulting pole position.
10. The bottom grouting process for mounting the lower structural member of the large-diameter shield tunnel according to claim 1, characterized in that: adopt concrete chute structure to grout in S2, concrete chute structure includes:
the base comprises a chassis frame and a support frame arranged on the chassis frame;
the concrete chute comprises a chute body forming a long strip-shaped discharging channel, wherein the chute body is provided with a discharging opening and a feeding opening, the chute body is obliquely arranged on the supporting frame from the feeding opening to the upper part and from the discharging opening to the lower part, and the discharging opening obliquely extends inwards from top to bottom;
the discharging baffle is erected at a discharging opening of the chute body in a turnover mode through a pivot extending around the width direction of the chute body, the discharging baffle is in an opening state and an intercepting state, when the discharging baffle is in the opening state, concrete pushes the discharging baffle to turn upwards around the pivot, the concrete is unloaded into a slot of the prefabricated arc-shaped part and the duct piece from an opening formed by the discharging baffle and the discharging opening, and the size of the opening is in direct proportion to the flow rate of the concrete; in the intercepting state, the discharging baffle turns around the pivot under the self-weight and closes the opening.
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