CN211647367U

CN211647367U - Device for improving concrete pouring flatness of bottom plate

Info

Publication number: CN211647367U
Application number: CN201922270001.9U
Authority: CN
Inventors: 吴世斌; 沈杰; 杨波; 罗刚; 刘喆; 汪红宇; 黄纪村; 刘凡; 冉景江; 冯建华; 张继屯; 张相明; 彭培龙
Original assignee: Sinohydro Bureau 5 Co Ltd; China Three Gorges Projects Development Co Ltd CTG
Current assignee: Sinohydro Bureau 5 Co Ltd; China Three Gorges Projects Development Co Ltd CTG
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-10-09
Anticipated expiration: 2029-12-17

Abstract

The utility model provides an improve device of bottom plate concrete placement roughness, includes that support bar and "Y" shape top hold in the palm, support bar and the structure setting that "Y" shape top held in the palm and constitute on bottom plate surface course structural steel bar, a plurality of support bars and "Y" shape top in the structure that "Y" shape top held in the palm and constitutes hold in the palm and divide three groups to set up respectively in cavern both sides and cavern middle part, a plurality of structures of same group are located same vertical face, set up one on the support of "Y" shape on a plurality of structures of same group and scrape a face rail. By adopting the structure, the supporting stability can be ensured, and the purpose of improving the flatness of the bottom plate concrete is achieved.

Description

Device for improving concrete pouring flatness of bottom plate

Technical Field

The utility model relates to a bottom plate concrete placement construction field, especially an improve device of bottom plate concrete placement roughness.

Background

The three-level hydropower station comprises a left bank, 3 flood discharging holes uniformly distributed on the left bank, 3 flood discharging holes linearly distributed, tunnel body sections of the tunnel body sections are all of a city gate hole type structure, the full section of an upper flat section is lined by adopting reinforced concrete, and the standard section size after lining is 15m multiplied by 18m (width multiplied by height). The bottom plates of the tunnel body of the flood discharging tunnel of the white crane beach are all positioned in the area of the overflow surface, and high-speed water flow has serious cavitation on the bottom plates according to the construction experience of the flood discharging tunnel of the conventional hydropower station. The maximum flow speed of the bottom plate of the upper flat section is designed to be 29m/s, so that the design puts extremely high requirements on the flatness of the concrete of the bottom plate (the maximum allowable unevenness value is 4mm/2m for the running rule inspection). Therefore, how to achieve the goal is the key point and difficulty of construction control.

According to past experience, in the construction of bottom plate concrete at the upper flat section of a flood discharge tunnel in the hydropower engineering in China, a T-shaped steel bar support and a round steel scraped surface rail are generally adopted as a bottom plate concrete flatness control device, and the device has the problems of poor support stability, difficulty in adjusting and disassembling the height of the scraped surface rail, and easiness in bending and floating, so that the concrete pouring flatness is poor. The technical requirement for unevenness of the concrete of the high-speed water flow bottom plate of the flood discharge tunnel is high, and the cavitation problem is prevented. Therefore, a device must be invented to ensure that the casting flatness quality of the upper flat section bottom plate concrete meets the design technical requirements.

Disclosure of Invention

The utility model aims to solve the technical problem that a device for improving bottom plate concrete pouring roughness is provided, can guarantee the support stability, reach the purpose that promotes bottom plate concrete roughness.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides an improve device of bottom plate concrete placement roughness, includes that support bar and "Y" shape top hold in the palm, support bar and the structure setting that "Y" shape top held in the palm and constitute on bottom plate surface course structural steel bar, a plurality of support bars and "Y" shape top in the structure that "Y" shape top held in the palm and constitutes hold in the palm and divide three groups to set up respectively in cavern both sides and cavern middle part, a plurality of structures of same group are located same vertical face, set up one on the support of "Y" shape on a plurality of structures of same group and scrape a face rail.

In the preferred scheme, the upper end of the supporting steel bar and the lower end of the jacking are both provided with external threads, and the upper end of the supporting steel bar and the lower end of the jacking are movably connected through a threaded sleeve.

In a preferable scheme, the top end of one side of the Y-shaped jacking support is provided with an ear plate, the ear plate is provided with a transverse threaded hole, and a horizontal fixing bolt is connected with the thread in the threaded hole.

In a preferred scheme, the height of the center shaft of the fixing bolt is higher than the height of the circle center of the scraping surface rail.

In the preferred scheme, the supporting steel bars are welded on the structural steel bars of the surface layer of the bottom plate, and the welding points are positioned on the smooth outer wall of the supporting steel bars close to the external threads at the upper end.

In a preferable scheme, the lower ends of the supporting steel bars are in contact with the foundation surface of the bottom plate.

The utility model provides an improve device of bottom plate concrete placement roughness through adopting above-mentioned structure, has following beneficial effect:

(1) the problems of support deformation, elevation adjustment of the scraping surface rail, difficulty in disassembly and easiness in bending and floating in the bottom plate concrete leveling process are solved, and the structural stability of the device is ensured;

(2) the functions of free adjustment of elevation, prevention of bending and floating and convenient disassembly are realized, the concrete pouring elevation of the bottom plate is effectively controlled, and the concrete flatness of the bottom plate is improved;

(3) after concrete pouring operation is completed, the threaded sleeve and the Y-shaped jacking support can be detached and recycled, so that the material is recycled, and the construction cost is greatly saved.

Drawings

The invention will be further explained with reference to the following figures and examples:

fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic side view of the present invention.

Fig. 3 is the utility model discloses an actual construction application schematic diagram.

In the figure: supporting steel bar 1, threaded sleeve 2, "Y" shape top support 3, scraped surface rail 4, fixing bolt 5, otic placode 6, bottom plate dowel 7, three roller 8.

Detailed Description

Example 1:

as shown in fig. 1-3, a device for improving the casting flatness of bottom plate concrete comprises supporting steel bars 1 and Y-shaped jacking supports 3, wherein a structure body formed by the supporting steel bars 1 and the Y-shaped jacking supports 3 is arranged on a bottom plate surface layer structural steel bar, the Y-shaped jacking supports 3 in the structure body formed by the supporting steel bars 1 and the Y-shaped jacking supports 3 are divided into three groups and are respectively arranged on two sides of a cavern and the middle part of the cavern, the plurality of structure bodies in the same group are positioned on the same vertical surface, and the Y-shaped jacking supports 3 on the plurality of structure bodies in the same group are provided with a scraping surface rail 4.

In the preferred scheme, 1 upper end of support reinforcement and 3 lower extremes of top support all be equipped with the external screw thread, realize swing joint through threaded sleeve 2 between 1 upper end of support reinforcement and the 3 lower extremes of top support.

In the preferred scheme, the top end of one side of the Y-shaped jacking 3 is provided with an ear plate 6, the ear plate 6 is provided with a transverse threaded hole, and a horizontal fixing bolt 5 is connected with the threaded hole in a threaded manner.

In a preferable scheme, the height of the center axis of the fixing bolt 5 is higher than the height of the center of the scraping surface rail 4.

In the preferred scheme, support reinforcement 1 weld on bottom plate surface course structural steel, the welding point is located support reinforcement 1 and is close to on the level and smooth outer wall of upper end external screw thread.

In a preferable scheme, the lower end of the support steel bar 1 is in contact with the base surface of the bottom plate.

Example 2:

as shown in fig. 3, the concrete pouring construction is performed by the following method:

1) after the elevation measurement and positioning of the closing surface of the plug template, three control lines are pulled between the plug template and the top surface of the old concrete along the direction parallel to the axis of the hole to serve as a top elevation control line for installing a scraped

surface rail

4, 3 devices are arranged along the direction of the control lines, and construction parameters are carried out according to the data;

2) after the device is preliminarily installed, the height of the scraped surface rail 4 is measured and checked (the error with the designed height is not larger than 2 mm), the fine adjustment function of the installation height of the scraped surface rail 4 is realized mainly by screwing the threaded sleeve 2, a gap is required between each jacking 3 and the scraped surface rail 4, the uniform stress of each supporting point is ensured, and after the checking is finished, the side fixing bolt 5 of each jacking 3 is screwed down to lock the scraped surface rail 4, so that the scraped surface rail 4 is prevented from floating upwards in the pouring process;

(3) carry out the concrete in-process of making level at three roller 8 of improvement, conduct pressure to scraped surface rail 4, rethread bottom sprag reinforcing bar 1 evenly conducts to bottom plate basal plane, guarantees the stable in structure of bracing reinforcing bar 1. In addition, a hollow steel pipe with the diameter of 60mm is used as the scraping surface rail 4, and the deflection deformation value is detected to be within 1mm, so that the condition that the scraping surface rail 4 is pressed, bent and deformed is effectively prevented, and the flatness quality of concrete is improved.

(4) After the concrete is leveled, take off 4 position surface layer concretes on the scraped surface rail, not hard up 3 side fixing bolt 5 of top support, can easily dismantle scraped surface rail 4, not hard up the threaded sleeve 2 between support bar 1 and the top support 3 again, also can easily dismantle top support 3 to reach threaded sleeve 2, top support 3 and scraped surface rail 4 reuse's effect.

Claims

1. The utility model provides an improve device of bottom plate concrete placement roughness, characterized by: including support bar (1) and "Y" shape top support (3), support bar (1) and the structure setting that "Y" shape top support (3) is constituteed on bottom plate surface course structural steel, a plurality of support bar (1) and "Y" shape top support (3) in the structure that (3) are constituteed are divided "Y" shape top support (3) and are divided three groups and set up respectively in cavern both sides and cavern middle part, a plurality of structures of same group are located same vertical face, set up one on "Y" shape top support (3) on a plurality of structures of same group and scrape a track (4).

2. The apparatus for improving the concrete casting flatness of a floor slab as claimed in claim 1, wherein: the supporting steel bar (1) upper end and top support (3) lower extreme all be equipped with the external screw thread, realize swing joint through threaded sleeve (2) between supporting steel bar (1) upper end and the top support (3) lower extreme.

3. The apparatus for improving the concrete casting flatness of a floor slab as claimed in claim 1, wherein: the Y-shaped top support (3) is characterized in that an ear plate (6) is arranged on the top end of one side of the Y-shaped top support, a transverse threaded hole is formed in the ear plate (6), and a horizontal fixing bolt (5) is connected with the threaded hole in an internal thread mode.

4. The apparatus for improving the concrete casting flatness of a floor slab as claimed in claim 3, wherein: the height of the center shaft of the fixing bolt (5) is higher than the height of the circle center of the scraping surface rail (4).

5. The apparatus for improving the concrete casting flatness of a floor slab as claimed in claim 1, wherein: the supporting steel bars (1) are welded on the structural steel bars of the bottom plate surface layer, and the welding points are located on the smooth outer wall, close to the upper end external threads, of the supporting steel bars (1).

6. The apparatus for improving the concrete casting flatness of a floor slab as claimed in claim 1, wherein: the lower end of the support steel bar (1) is in contact with the base surface of the bottom plate.