CN212146924U - Immersed tube precast concrete curing system - Google Patents

Abstract

The utility model relates to the technical field of immersed tube tunnel construction, in particular to an immersed tube precast concrete maintenance system, which comprises a maintenance shed covering above an immersed tube segment, wherein the framework of the maintenance shed is a top pull rod truss for building a pouring template, the maintenance system also comprises a first maintenance device used before stripping and a second maintenance device used after stripping, the first maintenance device and the second maintenance device both comprise a polymer maintenance film covering the surface of the immersed tube precast concrete, the maintenance system utilizes the existing truss in the immersed tube template support system as the framework of the maintenance shed to build the maintenance shed, thereby avoiding the problems of large workload and immersed tube transfer due to independent building of the maintenance shed, laying the polymer maintenance film on the surface of the immersed tube precast concrete, forming a moisture-keeping layer on the surface of the immersed tube precast concrete for a long time, the good moisturizing effect is achieved, and the long-time maintenance of the immersed tube is realized.

Description

Immersed tube precast concrete curing system

Technical Field

The utility model relates to an immersed tube tunnel construction technical field, especially an immersed tube precast concrete maintenance system.

Background

The existing underwater tunnel construction mainly comprises a pipe sinking method and a tunneling method, wherein the tunneling method is a construction method for forming the underwater tunnel by tunneling from an underwater solid layer, the pipe sinking method is a construction method for processing an underwater foundation and installing a sinking pipe on the processed foundation, wherein the sinking pipe is manufactured on a slipway or a dry dock in advance, and the tunneling method has the problems of construction conditions, high cost and the like. Along with the development of the immersed tube method technology, the construction of the underwater tunnel by adopting the immersed tube structure is more and more emphasized and popularized.

Because the underwater tunnel adopts a bidirectional multilane through immersed tube structure and has drainage, maintenance and electrical equipment arrangement space, the immersed tube segment structure has the characteristics of large section, large volume, complex structural form and construction process and the like, and is easy to have harmful cracks in the construction stage due to the reasons of temperature, shrinkage, constraint and the like. The appearance of the harmful temperature shrinkage cracks can not only influence the appearance of the structure, but also greatly promote harmful substances to corrode the main body structure of the concrete, thereby more quickly causing the corrosion of steel bars in the concrete and weakening the overall durability of the immersed tube concrete structure. The immersed tube segment is deeply buried underground or underwater, the cost is high, the corrosion environment is severe, the components cannot be replaced, the immersed tube is generally required to have the service life of more than 120 years, and reasonable and effective maintenance measures must be taken to prevent cracks in the process of prefabricating the immersed tube in order to ensure the service life of the immersed tube. Compared with the control of the pouring temperature of concrete, the control of the cooling rate, the internal and external temperature difference and the curing environment humidity of the concrete in the curing process is more important in construction, and the temperature and humidity of the curing environment directly determine whether harmful cracks can occur in the immersed tube segments. Therefore, the cooling rate, the internal and external temperature difference and the surface humidity of the immersed tube concrete in the hardening process are in a reasonable range, and the method is the key of crack control and maintenance of the immersed tube concrete.

In traditional maintenance mode, the mode of setting up maintenance canopy alone is usually adopted, the immersed tube that will pour the completion shifts to maintenance canopy in and carries out the maintenance, adopt the mode at immersed tube surface watering simultaneously, but these modes have different shortcomings, set up maintenance canopy alone and need occupy great place, and work load is great, immersed tube concrete structure is not fit for the transfer before the initial set simultaneously, and adopt the mode of watering, not only there is the problem of extravagant maintenance water, and can't carry out long-time moisturizing, need uninterruptedly to sprinkle, there is the great problem of work load equally.

SUMMERY OF THE UTILITY MODEL

The invention of the utility model aims to: to the wet-keeping effect that adopts traditional maintenance mode to exist among the prior art poor, the great problem of work load, provide an immersed tube precast concrete maintenance system, this maintenance system utilizes current truss to build maintenance canopy as maintenance canopy skeleton among the immersed tube template braced system, thereby avoided setting up the problem that the work load that maintenance canopy exists is big and need shift immersed tube alone, and lay the polymer maintenance membrane at immersed tube precast concrete surface, thereby form the moisturizing layer at immersed tube precast concrete surface long-time, reach good moisturizing effect, realize the long-time maintenance of immersed tube, the technical problem that need incessantly watering just can moisturize among the traditional technique has been overcome.

In order to realize the purpose, the utility model discloses a technical scheme be:

the utility model provides an immersed tube precast concrete maintenance system, is including hiding the maintenance canopy in immersed tube festival section top, the skeleton of maintenance canopy is for being used for setting up the top pull rod truss of pouring the template, and this maintenance system still includes the first curing means that is used for before the form removal and is used for the second curing means after the form removal, first curing means and second curing means all are including covering the polymer maintenance membrane on immersed tube precast concrete surface.

The immersed tube tunnel is composed of a plurality of tube sections, each tube section is composed of a plurality of sections, the immersed tube section generally comprises a bottom plate, a top plate and side walls, and the bottom plate, the top plate and the side walls are encircled to form a hollow gallery.

When pouring immersed tube precast concrete, the pouring template is arranged on the outer layer of the immersed tube, in the process of pouring immersed tube side wall concrete, in order to avoid the deformation of the pouring template outside the side wall due to the lateral force, the bottom of the pouring template outside the side wall is generally arranged, the middle part and the top are both provided with reinforcing structures, the reinforcing structure at the top comprises a top pull rod truss, the top pull rod truss spans the top of the immersed tube segment, the pouring templates outside the two side walls of the immersed tube segment are connected by means of mutual pulling force, and the deformation and the displacement of the pouring template outside the side wall can be effectively avoided.

The scheme effectively utilizes the existing structure in the process of pouring the immersed tube segments, the top pull rod truss for building the pouring template is used as a framework to build the maintenance shed, the maintenance shed can be utilized to maintain the immersed tube segments at two different time points before and after the internal mold is removed after the pouring is finished, the maintenance shed does not need to be built independently, and the problems that the workload is large and the immersed tube needs to be transferred and maintained when the maintenance shed is built independently are solved; on the other hand, because immersed tube segment structure has the characteristics that the cross-section is big, the volume is big, all adopt open-air dry dock method to prefabricate usually, utilize top pull rod truss as the skeleton to build the maintenance canopy, can effectively avoid receiving external weather influence at the immersed tube segment in-process of pouring for the immersed tube is similar to accomplish prefabricating in "indoor" and pours, improves immersed tube and pours the quality.

And the form removal refers to the removal of the immersed tube segment gallery template.

The polymer curing film has good heat preservation and moisture preservation double performance, can effectively inhibit the generation of micro cracks, can absorb water which is hundreds to thousands times of the self weight after adopting the polymer curing film, and forms a micro small reservoir after absorbing water, because of the self-owned characteristic, the curing film tightly pre-prepared concrete, does not flow, can not extrude and is difficult to evaporate, but can transmit and permeate on the surface of the concrete by capillary phenomenon, uninterruptedly provides water for concrete curing, and repeatedly absorbs the evaporated water of the immersed tube segment serving as a nutrient body, therefore, the immersed tube can be kept moist by more than 90 percent only by pouring a small amount of water.

Meanwhile, under the action of concrete hydration heat, the temperature in the membrane is 4-10 ℃ higher than that in the outside, and the heat preservation effect is effectively achieved.

As the preferable scheme of the utility model, the polymer curing membrane is used for covering on the bottom plate and the roof of immersed tube segment.

After the precast concrete of the immersed tube segment is poured and reaches initial setting, a polymer curing film is covered on the bottom plate and the top plate of the immersed tube segment in time, and water is sprayed to form a curing layer for curing.

Further, the polymer curing film is a single-layer curing film or a double-layer curing film.

As the utility model discloses an optimal scheme, the maintenance canopy extends to the template outside of pouring of immersed tube festival section both sides lateral wall for the maintenance canopy wraps up the template of pouring of lateral wall.

By adopting the maintenance shed with the structure form, a high-humidity sun-proof small environment is formed in the space in the shed, thereby being beneficial to early strength and inhibiting the generation of microcracks and well maintaining the immersed tube precast concrete.

Furthermore, the maintenance shed is formed by wrapping canvas, the top pull rod truss is completely wrapped by the canvas, and the outer molds on the two sides are also completely wrapped by the canvas, so that a space of the maintenance shed is formed.

As the preferred scheme of the utility model, the polymer maintenance membrane coats and is stamped geotechnological cloth layer.

The geotextile layer is laid on the polymer curing film, so that on one hand, external concentrated stress is effectively diffused, the polymer curing film is prevented from being damaged by external force, the polymer curing film is protected, and a protective effect is achieved, and on the other hand, the isolation and heat preservation effects are further achieved, so that shrinkage cracks caused by rapid temperature reduction of the immersed tube precast concrete are avoided;

as the preferred scheme of the utility model, still be equipped with the water-covering maintenance layer on the geotechnological cloth overburden.

The water-covered maintenance layer is formed by completely wetting the edge laths with maintenance water by the laths arranged at the peripheral edges of the bottom plate and the top plate of the immersed tube by using the polymer maintenance film and the geotextile layer. The water-covering curing layer can well ensure that concrete is cured under the conditions of constant temperature and constant humidity, and can greatly reduce plastic shrinkage cracks caused by water loss due to temperature and humidity change.

As the preferred proposal of the utility model, the water-covering maintenance layer is covered with a canvas layer.

And a layer of canvas is covered to preserve moisture and heat, so that the maintenance environment of the immersed tube segment is optimized, and the performance characteristic of the immersed tube segment after maintenance is further improved.

As the preferred scheme of the utility model, first curing means is provided with a plurality of shower nozzles including arranging the conduit on the top pull rod truss on this conduit.

The water pipe is connected with a maintenance water source, the water pipe is arranged on the top pull rod truss, and maintenance water is sprayed to the top plate of the immersed tube section through the spray head, so that the top is maintained in multiple ways, and a good maintenance effect is achieved.

As the preferred scheme of the utility model, the conduit arranges along immersed tube segment length direction, including arranging many lateral conduits in immersed tube segment roof middle part and both sides respectively.

The water pipe with the structure is distributed on the top plate of the immersed tube segment to cover all areas, so that all parts of the top plate of the immersed tube segment are maintained in a moisture-preserving manner when the water pipe is sprayed with maintenance water.

As the utility model discloses a preferred scheme, second curing means is including arranging the humidifier in the corridor.

Further, the humidifier is an ultrasonic humidifier, the ultrasonic humidifier is provided with a host with an automatic humidity control system, the host contains a communication module and a data receiving and processing module, and humidity sensors are arranged at a plurality of positions on the inner wall of the gallery of the immersed tube segment in a matched mode and used for collecting humidity data in the gallery and are in communication connection with the data receiving and processing module through the communication module of the host, so that the ultrasonic humidifier can automatically humidify or stop humidifying according to the received humidity data.

The ultrasonic humidifier of the automatic control system is adopted to ensure that the humidity environment of the immersed tube concrete in the hardening process is always in a reasonable range.

As the preferred scheme of the utility model, the second curing means still includes the protection casing of arranging at immersed tube segment corridor both ends tip.

The protective covers are arranged at the end parts of the two ends of the gallery, so that the immersed tube segment gallery can be effectively isolated from the external environment on the whole, and the ambient temperature and the ambient humidity of the immersed tube segment gallery are kept. Particularly, on the one hand, the protective cover is arranged to prevent water mist in the gallery from diffusing to the external environment, so that the energy-saving purpose is achieved, and on the other hand, the protective cover is arranged to prevent environmental wind from blowing over the gallery.

Further, the protection cover is made of waterproof canvas.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. the top pull rod truss in the process of pouring the immersed tube segments is used as a framework to build the maintenance shed, the maintenance shed can be used for maintaining the immersed tube segments at two different time points before the internal mold is removed and after the internal mold is removed after pouring is finished, the maintenance shed does not need to be built independently, and the problems that the workload is large and the immersed tubes need to be transferred and maintained when the maintenance shed is built independently are solved; on the other hand, as the immersed tube segment structure has the characteristics of large section and large volume, the immersed tube segment structure is generally prefabricated by adopting an open dry dock method, and the top pull rod truss is used as a framework to build a maintenance shed, so that the influence of outside weather in the process of pouring the immersed tube segment can be effectively avoided, the immersed tube is similar to the prefabricated pouring in an indoor environment, and the pouring quality of the immersed tube is improved;

2. the polymer curing film is covered on the surface layer of the precast concrete to be used as a immersed tube curing mode, so that the immersed tube can be well insulated and moisturized, and the generation of micro cracks can be effectively inhibited, so that the anti-permeability performance and the durability of the immersed tube structure are ensured;

3. the water conveying pipeline is arranged on the top pull rod truss, and the spray head sprays maintenance water to the top plate of the immersed tube section, so that the top is maintained in multiple ways, and a good maintenance effect is achieved.

Drawings

Fig. 1 is the structure schematic diagram of the precast concrete for the immersed tube of the utility model.

Fig. 2 is a schematic layout view of the immersed tube precast concrete curing system in example 1.

Fig. 3 is a schematic layout view of the immersed tube precast concrete curing system in example 2.

Fig. 4 is a schematic diagram of the arrangement of the water conveying pipeline on the top truss rod in the embodiment 2.

Fig. 5 is a partially enlarged view of a portion a in fig. 3.

The labels in the figure are: 1-bottom plate, 2-top plate, 3-side wall, 4-middle wall, 5-lane gallery, 6-middle gallery, 7-pouring template, 71-inner template, 72-inner template support system, 73-outer template, 74-outer template support system, 75-top tie truss, 8-curing shed, 9-first curing device, 10-second curing device, 11-polymer curing film, 12-geotextile layer, 13-water-covering curing layer, 14-canvas layer, 15-water pipeline, 15 a-branch pipeline, 1501-spray head, 16-curing water source, 17-humidifier.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Example 1

The embodiment provides a maintenance system for maintaining immersed tube precast concrete after pouring.

The immersed tunnel is composed of a plurality of pipe sections, each pipe section is composed of a plurality of sections, the embodiment is described by using immersed pipe sections with a three-chamber structure, as shown in fig. 1, the immersed pipe sections comprise a bottom plate 1, a top plate 2, side walls 3 and a middle wall 4, a driving lane gallery 5 for driving is formed among the bottom plate 1, the top plate 2, the side walls 3 at two sides and the middle wall 4, and a middle gallery 6 for arranging auxiliary facilities of the immersed pipe is formed among the bottom plate 1, the top plate 2 and the middle walls 4 at two sides.

When the precast concrete of the immersed tube is poured, the pouring template 7 is arranged on the outer layer of the immersed tube and comprises an inner template 71 and an inner template supporting system 72 which are arranged in the lane corridor 5, the pouring template 7 further comprises an outer template 73 and an outer template supporting system 74, in order to avoid the deformation of the outer template 73 on the outer side of the side wall due to the lateral force, reinforcing structures are usually arranged at the bottom, the middle and the top of the pouring template on the outer side of the side wall, the reinforcing structures at the top comprise top pull rod trusses 75, the top pull rod trusses 75 span the top of the immersed tube segment, the outer template supporting systems 74 outside the two side walls of the immersed tube segment are connected by means of mutual pulling force, and the deformation and the displacement of the pouring template outside the side wall can be effectively.

The outer formwork support system 74 and the outer formwork 73 form a generalized outer wall outer side pouring formwork, the outer side pouring formworks of the left side wall 3 and the right side wall 3 are connected through a top pull rod truss 75 arranged at the top of the immersed tube segment, the outer side pouring formworks can form an integral structure, deformation of the outer formwork due to lateral force can be effectively prevented in the process of pouring side wall concrete, and the maintenance system is formed by just adopting the existing structures.

As shown in fig. 2, the immersed tube precast concrete curing system comprises a curing shed 8 covering the upper part of an immersed tube segment, wherein the framework of the curing shed 8 comprises a top tension rod truss 75 for building a pouring formwork 7, the curing system further comprises a first curing device 9 used before formwork removal and a second curing device 10 used after formwork removal, and the first curing device 9 and the second curing device 10 both comprise a polymer curing film 11 covering the surface of the immersed tube precast concrete.

The form removal refers to a process of removing a template in the gallery of the immersed tube segment, and specifically comprises the step of removing the template in the gallery 5 of the traffic lane and the template in the gallery 6.

In one embodiment, the polymer curing film 11 is used to cover the bottom plate 1 and the top plate 2 of the sinking tube segment. In other embodiments, according to actual construction conditions and quality requirements, the polymer curing film 11 may be laid on other parts of the immersed tube segment, and after the pouring of the precast concrete of the immersed tube segment is completed and the initial setting is reached, the polymer curing film is laid on the surface of the precast concrete of the immersed tube segment in time, specifically: before demolising pouring template 7, place at not being provided with pouring template 7 and lay polymer maintenance membrane 11, after demolising pouring template 7, all surfaces at immersed tube precast concrete all can lay polymer maintenance membrane 11, when being similar to roof 2 inboard, side wall 3 or well wall 4 etc. can not directly lay the place of polymer maintenance membrane and lay, need arrange interim strutting arrangement and support the polymer maintenance membrane, thereby guarantee that the polymer maintenance membrane covers the top layer position at immersed tube precast concrete, through covering the polymer maintenance membrane, the watering forms the maintenance layer and maintains immersed tube segment.

The polymer curing film 11 adopts a single-layer curing film or a double-layer curing film according to the curing quality requirement.

As a preferred embodiment, the curing shed extends to the outside of the casting forms of the side walls 3 on both sides of the immersed tube segment, so that the curing shed 8 wraps the casting forms of the side walls 3, that is, after the curing shed 8 is erected on the top truss 75, the curing shed 8 covers the outer forms 73 and the outer form support systems 74 together outside the outer walls 3 on both sides of the immersed tube segment, so that the immersed tube segment is located in the curing shed 8 before and after the outer forms 73 are removed, thereby forming a better and more sealed curing environment.

The shelter 8 may be formed from canvas or other similar cotton or hemp fabric placed on the framework, the canvas being of sufficient size to completely enclose the top truss 75, the outer formwork 73 and the outer formwork support system 74 to form a shelter space.

As one of the preferable embodiments, in order to make the framework of the maintenance shed more compact and avoid the maintenance shed between the top tension rod trusses from being in a suspended state, the framework of the maintenance shed may be provided with a support structure between the top tension rod trusses, for example, by connecting the top tension rod trusses on two sides of the cross bar lap joint, or by temporarily adding a section steel structure on the top plate of the immersed tube segment.

The polymer maintenance membrane can the exclusive use, also can cover one deck geotechnological cloth layer 12 on the polymer maintenance membrane, and geotechnological cloth layer 12 can prevent that polymer maintenance membrane 11 from being destroyed with external concentrated stress diffusion on the one hand effectively, and on the other hand, geotechnological cloth layer 12 can further play the effect of keeping apart the heat preservation, effectively avoids producing the shrinkage crack.

In one embodiment, the geotextile layer 12 in this embodiment is further provided with a water-covering maintenance layer 13, and the water-covering maintenance layer is covered with a canvas layer 14.

In another embodiment, the canvas layer 14 is applied directly to the geotextile layer 12.

When the polymer curing film 11, the geotextile layer 12, the water-covering curing layer 13, and the canvas layer 14 are sequentially laid on the surface of the precast concrete at the same time, the structure is as shown in fig. 5, which is an enlarged view of a portion a in fig. 3.

Example 2

The embodiment provides a more optimized immersed tube precast concrete curing system, which is mainly used for curing and dismantling immersed tube segments before and after a pouring template.

The sinking pipe precast concrete curing system of this embodiment is substantially the same as that of embodiment 1, except that there is a more optimized structural arrangement of the first curing means 9 and the second curing means 10 of embodiment 1.

As shown in fig. 3 and 4, the first maintenance device 9 further includes a water pipe 15 disposed on the top tie-bar truss 75, the water pipe 15 is provided with a plurality of spray nozzles 1501, the spray nozzles 1501 are used for spraying maintenance water to the immersed tube segments, the water pipe 15 is connected with a maintenance water source 16, the maintenance water source 16 is disposed on the construction site, and the water pipe 15 draws water from the maintenance water source 16 and extends to the top tie-bar truss 75 through the gap of the outer formwork support system 74.

As a preferred embodiment, the water pipe 15 includes a plurality of branch pipes 15a respectively disposed at the middle and both sides of the top plate of the sinking segment, the water pipe 15 is disposed along the width direction of the sinking segment, the plurality of branch pipes 15a are formed by a three-way joint, the branch pipes 15a are disposed along the length direction of the sinking segment, a plurality of spray nozzles 1501 are respectively disposed on each branch pipe 15a, and the plurality of spray nozzles 1501 are respectively disposed at the bottom and/or the side of the branch pipe 15a, so as to form a full-area coverage of the top of the sinking segment.

It should be noted that the water pipe structure can also be used in maintenance of the precast concrete structure before the inner mold is removed, that is, the water pipe structure can be used in embodiment 1, such as the water pipe 15 shown in fig. 2.

The optimized implementation mode of the second maintenance device is as follows: the second curing means 10 is still including arranging humidifier 17 in the corridor, humidifier 17 is the ultrasonic humidifier, and this ultrasonic humidifier disposes the host computer of taking humidity automatic control system, the host computer contains communication module and data receiving processing module, and supporting ground, has arranged humidity transducer at a plurality of positions of the inner wall of immersed tube festival section corridor, humidity transducer is used for gathering the humidity data in the corridor to communication module through the host computer, with data receiving processing module communication connection, make the ultrasonic humidifier according to the automatic humidification of received humidity data or stop the humidification.

The implementation mode of further optimization is as follows: the second maintenance device 10 further comprises protective covers (not shown in the figures) arranged at the ends of the sinking segment galleries, which covers all the cavities of the roadway galleries 5 and the middle gallery 6, including both sides, i.e. all the peripheral edges of the galleries, thereby isolating the sinking segment galleries from the external environment and maintaining the ambient temperature and humidity of the sinking segment galleries.

During concrete implementation, can adopt to set up the canvas alone as the mode of independent protection casing, also can increase the length of maintaining the canopy, for example adopt the canvas as the layer that covers of maintaining the canopy, extension canvas length to make the canvas on ground at immersed tube festival section both ends drippage, and then keep apart immersed tube festival section corridor and external environment.

It should be noted that, when the precast concrete surface of this embodiment is sequentially laid with the polymer curing film 11, the geotextile layer 12, the water-covering curing layer 13, and the canvas layer 14 on the precast concrete surface, the structure is as shown in fig. 5, which is an enlarged view of a in fig. 3.

The immersed tube precast concrete curing system of the embodiment is more preferably used in the process after the templates in the roadway corridor are removed.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a immersed tube precast concrete maintenance system, its characterized in that, is including covering maintenance canopy (8) in immersed tube festival section top, the skeleton of maintenance canopy (8) is for being used for building top pull rod truss (75) of pouring template (7), and this maintenance system still includes first curing means (9) before being used for the form removal and is used for second curing means (10) after the form removal, first curing means (9) and second curing means (10) all include polymer maintenance membrane (11) that cover on immersed tube precast concrete surface.

2. Immersed tube precast concrete curing system according to claim 1, characterized in that the polymer curing membrane (11) is used to cover the bottom plate (1) and top plate (2) of immersed tube segment.

3. Immersed tube precast concrete curing system according to claim 1, characterized in that the curing shed (8) extends outside the casting forms (7) of the side walls (3) on both sides of the immersed tube section, so that the curing shed (8) wraps the casting forms (7) of the side walls (3).

4. Immersed tube precast concrete curing system according to claim 1, characterized in that the polymer curing membrane (11) is covered with a geotextile layer (12).

5. The immersed tube precast concrete curing system according to claim 4, wherein a water covering curing layer (13) is further provided on the geotextile layer (12).

6. Immersed tube precast concrete curing system according to claim 5, characterized in that, the water covering curing layer (13) is covered with canvas layer (14).

7. Immersed tube precast concrete curing system according to any one of claims 1-6, characterized in that the first curing means (9) comprises a water pipe (15) arranged on a top tie truss (75), the water pipe (15) being provided with a plurality of spray nozzles (1501).

8. The immersed tube precast concrete curing system as recited in claim 7, wherein said water pipe (15) is disposed along a length direction of the immersed tube section, and comprises a plurality of branch pipes (15 a) respectively disposed at a middle portion and both sides of the top plate (2) of the immersed tube section.

9. Immersed tube precast concrete curing system according to one of claims 1-6, characterized in that the second curing means (10) comprises a humidifier (17) arranged in a corridor.

10. The immersed tube precast concrete curing system according to claim 9, wherein the second curing means (10) further comprises a shield disposed at both end portions of the immersed tube segment gallery.

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