CN216892883U

CN216892883U - Reserved hole plugging structure based on suspended PK prestressed concrete laminated slab

Info

Publication number: CN216892883U
Application number: CN202123304744.7U
Authority: CN
Inventors: 耿鸣山; 万建成; 郑翔; 林尔姬; 刘健美; 徐文田; 翟利华; 付兵
Original assignee: Guangzhou Metro Design and Research Institute Co Ltd
Current assignee: Guangzhou Metro Design and Research Institute Co Ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-07-05
Anticipated expiration: 2031-12-24

Abstract

The utility model discloses a reserved hole plugging structure based on suspended PK prestressed concrete laminated slab, comprising a PK prestressed concrete laminated slab connected with the reserved hole and a detachable suspension mechanism for suspending the PK prestressed concrete laminated slab; the preformed PK prestressed concrete laminated slab is applied to the preformed hole plugging of the subway station, the hole plugging can be performed simultaneously with the construction below the hole, and the influence on the subsequent construction is small; the connection between the prefabricated plugging plate and the peripheral structure has good reliability and good structural safety; the PK prestressed concrete laminated slab ensures that the prefabricated slab has good rigidity and bearing capacity, thereby obviously reducing the deflection of the blocking slab.

Description

Reserved hole plugging structure based on suspended PK prestressed concrete laminated slab

Technical Field

The utility model relates to the technical field of large-scale preformed hole plugging, in particular to a preformed hole plugging structure based on a suspended PK prestressed concrete laminated slab.

Background

In the subway engineering, a plurality of stations constructed by an open cut method and construction operation holes with large reserved sizes in the top plate and the middle plate of an interval structure are generally selected along the subway so as to meet the hoisting requirements of various material equipment such as a shield tunneling machine and a track panel. Typical holes include shield hoisted holes, shield earth-discharging holes, track panel wellbores, and the like. After the adjacent sections are completed, the holes need to be plugged. Because the construction period of the subway is relatively tight, each procedure inevitably needs cross operation. Therefore, the plugging of the reserved holes is difficult to realize on the premise of ensuring the normal and safe operation of the rail running area under the plate.

At present, the conventional cast-in-place reinforced concrete slab is generally adopted for plugging large reserved holes of the concrete structure in China. The method needs a series of procedures of erecting supports, erecting templates, binding reinforcing steel bars, pouring a large amount of concrete and maintaining in a reserved hole area or below the reserved hole area to be blocked, has the defects of high labor intensity of constructors, low construction speed and the like, and has great influence on the construction period progress of later-stage station, interval interior decoration, electromechanical construction and other operations. In order to avoid the influence of the lower part erected support on the subsequent construction of the lower part section, the bottom die for plugging the reserved hole of part of urban subway stations is constructed by a die hanging method, namely, a bearing beam is supported in the reserved hole opening, a supporting beam is hung below a plate through a hanging rod, and square timbers and templates are laid on the support beam. The method has no support in the lower area, can realize the cross operation of the procedures of blocking, track laying under the plate, pipeline installation, decoration and the like, and obviously quickens the overall construction progress, but the method still has the defects of the need of laying a template on the bottom surface of the blocking plate, large workload of wet operation and the like.

By adopting a reasonable assembly type scheme, two problems that the wet workload of a reserved hole plugging site is large and the follow-up construction progress is influenced can be better solved. The assembly type scheme also accords with the national policy and the development trend of the building industry. Many scholars at home and abroad put forward various prefabricated assembly schemes for plugging reserved holes, wherein most typically, prefabricated plates are erected on reserved grooves by groove connection. The disadvantage of this solution is that it does not transmit the bending moment, the shock resistance is poor and it requires complex waterproofing.

On the other hand, the span of the large reserved hole is relatively large, and the plugging plate constructed later is easy to generate large deflection and deformation in the using process, so that the deflection requirement on the concrete structure under the limit state of normal use cannot be met, and the phenomena of concrete cracking and water leakage at the joint can be caused. Therefore, when the prefabricated assembly technology is used for improving the plugging efficiency of the large reserved hole of the concrete structure, reasonable measures are necessary to be taken to control the problem that the deflection of the large-span plugging plate is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems and provides a reserved hole plugging structure based on suspended PK prestressed concrete laminated slabs, the prefabricated PK prestressed concrete laminated slabs are applied to the plugging of reserved holes of subway stations, the hole plugging can be carried out simultaneously with the construction below the holes, and the subsequent construction is less influenced; the connection between the prefabricated plugging plate and the peripheral structure has good reliability and good structural safety; the PK prestressed concrete laminated slab ensures that the prefabricated slab has good rigidity and bearing capacity, thereby obviously reducing the deflection of the blocking slab.

In order to solve the problems, the utility model adopts the following technical scheme:

the utility model provides a reserve hole block structure based on suspend PK prestressed concrete superimposed sheet in midair, include with the PK prestressed concrete superimposed sheet that the reservation hole is connected and be used for suspending in midair PK prestressed concrete superimposed sheet can dismantle and suspend the mechanism in midair, PK prestressed concrete superimposed sheet is used for the shutoff to reserve the hole.

Preferably, the PK prestressed concrete composite slab comprises a lower prefabricated slab and an upper cast-in-place layer.

Preferably, the connection is a wet connection.

Preferably, the detachable suspension mechanism comprises an upper steel beam, a suspension rod and a sleeper beam.

Preferably, the bolster is disposed under the lower precast slab.

Preferably, the suspension rod is provided with an isolation sleeve.

Preferably, the lower prefabricated slab and the reserved hole are provided with a protruding steel bar.

Preferably, the length of the lower prefabricated plate in the longitudinal rib direction is smaller than that of the corresponding side of the reserved hole.

Preferably, the lower prefabricated panel is provided with a preset through hole for the suspension rod to pass through.

Preferably, a connecting sleeve for connecting the extending steel bars is arranged between the lower prefabricated plate and the reserved hole.

The beneficial effects of the utility model are as follows:

1) the hole plugging can be performed simultaneously with the construction below the hole, and the influence on the subsequent construction is small.

2) The prefabricated plugging plate is connected with the peripheral structure, so that the reliability is good, and the structural safety is good. The prefabricated part is connected with the peripheral structure well, and the mechanical property of the node is superior.

3) The PK prestressed concrete laminated slab ensures that the prefabricated slab has good rigidity and bearing capacity, thereby obviously reducing the deflection of the blocking slab.

4) The workload of field wet operation is small, and the labor intensity of workers is low; the construction site does not need to be provided with a bottom die, the installation process is simple and convenient, templates can be saved, and the labor intensity of workers can be reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a plugging state diagram of a preformed hole plugging structure based on a suspended PK prestressed concrete laminated slab.

Fig. 2 is a schematic structural diagram of a suspended PK prestressed concrete laminated slab with a reserved hole plugging structure.

Fig. 3 is an assembly schematic diagram of a detachable suspension mechanism of a pre-hole blocking structure based on suspended PK prestressed concrete composite slab.

In the figure:

10. reserving holes;

20. PK prestressed concrete laminated slab; 21. a lower prefabricated slab; 22. an upper cast-in-place layer; 211. extending the reinforcing steel bars;

30. a detachable suspension mechanism; 31. an upper steel beam; 32. a boom; 33. a bolster; 321. and isolating the sleeve.

Detailed Description

The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments, and not all of the embodiments.

In the embodiments, it should be understood that the terms "middle", "upper", "lower", "top", "right", "left", "above", "back", "middle", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In addition, in the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, terms such as mounted, connected and the like are to be broadly construed, and for example, may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

As shown in fig. 1 to 3, a preformed hole blocking structure based on suspended PK prestressed concrete composite slab comprises PK prestressed concrete composite slab 20 wet-connected with said preformed hole 10 and detachable suspension mechanism 30 for suspending said PK prestressed concrete composite slab 20.

In this embodiment, the PK prestressed concrete composite slab 20 includes a lower precast slab 21 and an upper cast-in-place layer 22. The lower prefabricated panel 21 is prefabricated in advance by trusses, steel bars, and concrete.

In this embodiment, the detachable suspension mechanism 30 includes an upper steel beam 31, a boom 32, and a bolster 33. The detachable suspension mechanism 30 is an auxiliary structure that temporarily supports the lower prefabricated panel 21 at a specific position and height. The gravity load of the lower prefabricated slab 21 and the upper cast-in-place layer 22 and the construction load thereof are transmitted to the peripheral structure of the reserved hole 10 through the upper steel beam 31, the hanger rod 32 and the sleeper beam 33.

The bolster 33 is disposed under the lower prefabricated panel 21. The sleeper beams 33 are used to support the dead weight and construction loads of the lower precast slab 21 and the upper cast-in-place layer 22.

In this embodiment, the suspension rod 32 is provided with an isolation sleeve 321, and the suspension rod 32 is isolated from the concrete of the upper cast-in-place layer 22 by the sleeve, so as to be conveniently taken down after plugging is completed.

In this embodiment, the lower prefabricated slab 21 and the preformed hole 10 are both provided with protruding steel bars 211, so that the protruding steel bars 211 can be conveniently connected in the later period, and the stability after plugging is improved.

In this embodiment, the length of the lower prefabricated plate 21 in the longitudinal direction is less than the length of the corresponding side of the reserved hole 10, so that a gap of about 10cm is formed between the lower prefabricated plate 21 and the reserved hole 10.

In this embodiment, the lower prefabricated panel 21 is provided with a predetermined through hole (not shown) for the suspension rod 32 to pass through. The hanger bar 32 passes through a predetermined through-hole and both ends are connected to the upper steel beam 31 and the sleeper beam 33, respectively.

In some embodiments, a connecting sleeve for connecting the protruding steel bars 211 is disposed between the lower prefabricated panel 21 and the preformed hole 10, and the protruding steel bars 211 on the lower prefabricated panel 21 and the protruding steel bars 211 on the preformed hole 10 are connected through the connecting sleeve.

In some embodiments, the protruding steel bars 211 of the lower prefabricated panel 21 and the protruding steel bars 211 of the reserved holes 10 are welded.

When in construction use:

1. the upper steel beam 31 is erected at the expected position of the peripheral structure of the reserved hole 10;

2. hoisting the pre-fabricated PK pre-stressed concrete laminated slab 20 to a desired position and height;

3, installing a suspension rod 32 and a sleeper beam 33 to enable the lower prefabricated slab 21 to be suspended below the upper steel beam 31;

4. connecting the lower prefabricated slab 21 with the protruding steel bars 211 in the reserved holes 10 by welding or connecting sleeves;

5. pouring the newly mixed concrete on the upper surface of the lower prefabricated slab 21 and at the joint position, and matching with a template to form an upper cast-in-situ layer 22;

and 6, conventionally curing the newly poured concrete for about 1 week, and then removing the detachable suspension mechanism 30 and the template to finish the plugging of the reserved hole 10.

This mode has the following beneficial effects:

1) the hole plugging can be carried out simultaneously with the construction below the hole, and the subsequent construction is slightly influenced.

3) The PK prestressed concrete laminated slab 20 ensures that the prefabricated slab has good rigidity and bearing capacity, thereby obviously reducing the deflection of the blocking slab.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention; no element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such.

Claims

1. The utility model provides a reserve hole block structure based on suspend PK prestressed concrete superimposed sheet in midair which characterized in that: comprises that

The PK prestressed concrete laminated slab is used for plugging the reserved hole and connected with the reserved hole; and

and the detachable suspension mechanism is used for suspending the PK prestressed concrete laminated slab.

2. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 1, wherein: the PK prestressed concrete laminated slab comprises a lower prefabricated slab and an upper cast-in-place layer.

3. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 1, wherein: the connection is a wet connection.

4. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 2, wherein: the detachable suspension mechanism comprises an upper steel beam, a suspension rod and a sleeper beam.

5. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 4, wherein: the sleeper beam is arranged below the lower precast slab.

6. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 4, wherein: an isolation sleeve is arranged on the hanging rod.

7. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 4, wherein: and the lower prefabricated plate and the reserved hole are provided with extending steel bars.

8. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 2, wherein: the length of the lower prefabricated slab in the longitudinal rib direction is smaller than that of the corresponding edge of the reserved hole.

9. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 4, wherein: and the lower prefabricated plate is provided with a preset through hole for the suspension rod to pass through.

10. The preformed hole plugging structure based on suspended PK prestressed concrete laminated slab as claimed in claim 7, wherein: and a connecting sleeve for connecting the extending steel bars is arranged between the lower prefabricated plate and the reserved hole.