CN215887935U

CN215887935U - Hollow bent cap supporting system

Info

Publication number: CN215887935U
Application number: CN202121560854.7U
Authority: CN
Inventors: 陈文献; 王继明; 柴根林; 万绍平; 张常清
Original assignee: China United Engineering Corp Ltd
Current assignee: China United Engineering Corp Ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2022-02-22
Anticipated expiration: 2031-07-09

Abstract

The utility model provides a hollow bent cap supporting system which is reasonable in structural design, convenient to construct and short in construction period. The utility model comprises a vertical column and an underwater bearing platform; the upright posts are fixed on the underwater bearing platform, and at least two upright posts are fixed and arranged side by side; the method is characterized in that: the device also comprises a Bailey beam, a capping beam bottom die, a steel buttress and a counter-pull screw rod; the Bailey beams are arranged on two sides of the upright post; the oppositely-pulling screw rods are fixedly connected with the Bailey beams on the two sides of the upright post, and oppositely-pulling and fixing the Bailey beams on the two sides of the upright post together, so that the Bailey beams are tightly attached to the upright post; a cover beam bottom die is arranged between two adjacent upright columns, two ends of the cover beam bottom die are erected on the two upright columns, and the cover beam bottom die is fixed on the Bailey beam; the bailey beam is fixed on the underwater bearing platform through the steel buttress.

Description

Hollow bent cap supporting system

Technical Field

The utility model relates to a hollow bent cap supporting system which is mainly used for bridge construction.

Background

The bridge pier design of No. 1-8 and No. 13-14 bridge segments of the Taizhou Bapu transoceanic lake bridge is totally 20 hollow bent cap beams, the geometric dimension of the bridge pier design is 18.4X 2.2X 1.6m, the C40 reinforced concrete structure is provided, the total load is about 160t, the structure is supported by 2.2X 2.2+ 2.2X 1.8/4 upright posts after being formed, and the net span of 3 hollow parts in the middle is 3.6 m. For the engineering in the form, the conventional full-hall support method construction is adopted in the prior art, and the defects that the scaffold is more complicated to erect in water, the construction is inconvenient and the construction period is long are overcome.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide the hollow bent cap supporting system which is reasonable in structural design, convenient to construct and short in construction period.

The technical scheme adopted by the utility model for solving the problems is as follows: a hollow bent cap supporting system comprises upright posts and an underwater bearing platform; the upright posts are fixed on the underwater bearing platform, and at least two upright posts are fixed and arranged side by side; the method is characterized in that: the device also comprises a Bailey beam, a capping beam bottom die, a steel buttress and a counter-pull screw rod; the Bailey beams are arranged on two sides of the upright post; the oppositely-pulling screw rods are fixedly connected with the Bailey beams on the two sides of the upright post, and oppositely-pulling and fixing the Bailey beams on the two sides of the upright post together, so that the Bailey beams are tightly attached to the upright post; a cover beam bottom die is arranged between two adjacent upright columns, two ends of the cover beam bottom die are erected on the two upright columns, and the cover beam bottom die is fixed on the Bailey beam; the bailey beam is fixed on the underwater bearing platform through the steel buttress.

The steel buttress comprises a sand barrel, a steel pipe pile and coarse sand; the top of the steel pipe pile is fixedly arranged on the Bailey beam; the sand barrel is fixedly arranged on the underwater bearing platform and filled with coarse sand; the steel pipe pile is inserted into the sand barrel, and the bottom of the steel pipe pile is pressed on the coarse sand.

The sand barrel is provided with an unloading hole, and an unloading bolt is arranged in the unloading hole.

The steel buttress also comprises an installation lifting lug, and the installation lifting lug is fixedly installed on the sand bucket.

The bottom of the bottom die of the bent cap is fixed on the Bailey beam through the supporting section steel.

Compared with the prior art, the utility model has the following advantages and effects: in the work progress, change conventional scaffold and set up comparatively loaded down with trivial details support technology in aqueous, borrow the aquatic cushion cap as the holding surface, adopt steel buttress + bailey roof beam + to drawing the screw rod to implement the structure construction, have simple structure, set up convenient, support stable, safe can, construction convenience, the short advantage of time limit for a project of construction, erection time: one 25t crane and 6 workers are matched for operation, only 1.5 days are needed, and the effect is improved by 3.5 days compared with the effect of erecting and installing a full-scale support.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a steel pier according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

The embodiment of the utility model comprises a Bailey beam 1, a capping beam bottom die 2, a steel buttress 3, a counter-pull screw 4, an upright post 5 and an underwater bearing platform 6.

The underwater bearing platform 6 is fixedly arranged on the lake bed and is used for supporting the bridge approach section in water.

The upright post 5 is fixed on the underwater bearing platform 6 and used for supporting the hollow-out bent cap after the structure is formed. The stand 5 is at least two, sets up side by side.

The Bailey beams 1 are arranged on two sides of the upright post 5.

The opposite-pulling screw rods 4 are fixedly connected with the Bailey beams 1 on the two sides of the upright post 5, the Bailey beams 1 on the two sides of the upright post 5 are oppositely pulled and fixed together, and the Bailey beams 1 are tightly attached to the upright post 5.

A bent cap bottom die 2 is arranged between two adjacent upright posts 5, and two ends of the bent cap bottom die 2 are lapped on the two upright posts 5. The bottom of the coping bottom die 2 is fixed on the Bailey beam 1 through the supporting section steel.

The bailey beam 1 is fixed on the underwater bearing platform 6 through the steel buttress 3. The steel buttress 3 comprises a sand barrel 31, a steel pipe pile 32, a mounting lug 33, a relief bolt 34 and coarse sand 35. The top of the steel pipe pile 32 is fixedly installed at the bottom of the bailey beam 1. The sand barrel 31 is fixedly arranged on the underwater bearing platform 6, and coarse sand is filled in the sand barrel 31. An unloading hole is formed in the sand barrel 31, and an unloading bolt 34 is installed in the unloading hole. The steel pipe pile 32 is inserted into the sand tub 31 with its bottom pressed against the coarse sand 5. The mounting lug 33 is fixedly mounted on the sand tub 31.

Firstly, a construction method installation form.

1. The bent cap bottom die 2 is mainly formed by processing a 10mm thick steel plate according to the designed shape and size by a manufacturer, the lower openings at two sides exceed 8cm, a [ 20 type steel @ 50 interval 6 channels is arranged along the bridge direction below the bent cap bottom die, and the bent cap bottom die and the arched steel die are integrated and are placed on the Bailey beam 1 to bear hollow bent cap reinforced concrete and other loads;

2. the hollow bent-over side mould is mainly made of a 6mm thick steel plate, and is welded with angle 75 angle iron at 40 square grid spacing on the outer side to form a whole, and the outer vertical surface is symmetrically provided with [ 12 type angle 80 spacing 24-pass movable vertical ribs for enhancing the rigidity of the steel mould deformed by the impact of the concrete.

3. Reserving 3cm counter-pulling screw rod holes at the positions 20cm below the vertical surfaces of the 4 pier tops for counter-pulling reinforcement of the bottoms of the vertical ribs of the hollow bent cap steel die;

4. reserving 8cm below the reserved hole as a horizontal line on the upper side of the installation of the Bailey beam 1, so that the hollow bent cap steel die can be conveniently placed at the bottom of 24 vertical ribs;

5. and manufacturing phi 270mm delta 10+ phi 230mm delta 10 steel buttress 2 and 3=6 sleeves, respectively arranging the sleeves on the tops of the central bearing platforms on two sides below the 3 hollowed-out bottom steel dies, and performing closed calculation and determination on the height of the sleeves according to the difference between the cover beam bottom elevation, the Bailey beam 1.5m height and the bearing platform top elevation, as shown in the following table.

A height list is prepared for the hollow-out capping beam steel buttress of the bridge piers No. 2-5 #, No. 7-8 #, No. 13-14 #.

The steel buttress 3 mainly bears the load of 31.68 × 3=95.04t of the reinforced concrete at the hollow part, the load of 3.0 × 1.5m Bailey beam 7 × 2 segment × 0.27=3.78t and other loads of 95.04 × 10% =9.5t, and the total load is about 108.324 t. And after the construction of the structure is completed and the design strength is reached, loosening the phi 40 unloading bolt 34 to enable coarse sand 35 to flow out under the action of load, and then, falling the frame to dismantle the implementation of each layer surface and installing the next hollow-out bent cap support system.

6. 3.0 × 1.5m common beret beams 17 × 2 are respectively arranged above two outer sides of 2 × 3=6 steel buttresses, and mainly bear other loads of 3 hollow-out cover beam structures 95.5t and 95.04 × 10% =9.504t, and the total load is about 105.004 t.

7. 3, adopting a 3X 2 phi 1.5cm split screw 4 in the middle of the Bailey beam right below the projection surface of the 3 hollow bent caps to split and reinforce the Bailey beams on two sides, and ensuring that the Bailey beams are firmly attached to 4 stand columns and are stressed vertically;

8. the installation period is short, one 25t crane is used, 6 workers are matched for operation, only 1.5 days are needed, and the effect is improved by 3.5 days compared with the effect of erecting and installing full-space supports.

Secondly, the main parameters of the construction method are as follows:

1. the load of the single hollow-out part reinforced concrete is as follows: 3.6 × 2.2 × 1.6 × 2.5=31.68 t;

2. the capping beam bottom die 2, the pedestrian walkways, the appliances and other loads are considered by 10 percent: 31.68 × 0.1=3.2 t;

3. checking national standard, quality of the Bailey beam 1 single piece: 270kg, single-layer single-row allowable bending moment 78.82t.m and shearing force 24.52 t;

when the wall thickness delta =10mm and is less than or equal to 22mm, the yield strength [ sigma ] of the steel buttress seamless steel pipe]_{Steel pipe}=245Mpa；

4. Total load: 31.68+3.2+0.27=35t × 3=105t, area load: 35t/(3.6 × 2.2) =4.4t/m²And line load: 35t/3.6m =9.7 t.m.

Thirdly, comparing the safety factors

The single-layer single-row bearing force bending moment 78.82t.m of the common Bailey beam is more than 9.7t.m, the shearing force 24.52 is more than 9.7t.m/2=4.85t, and the stress meets the requirement; the yield strength of the steel buttress seamless steel pipe is more than [ sigma ] (sigma =236.4 Mpa)]_{Steel pipe}And the stress of the steel buttress meets the requirement of 245 Mpa.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the utility model are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the utility model as defined in the accompanying claims.

Claims

1. A hollow bent cap supporting system comprises upright posts and an underwater bearing platform; the upright posts are fixed on the underwater bearing platform, and at least two upright posts are fixed and arranged side by side; the method is characterized in that: the device also comprises a Bailey beam, a capping beam bottom die, a steel buttress and a counter-pull screw rod; the Bailey beams are arranged on two sides of the upright post; the oppositely-pulling screw rods are fixedly connected with the Bailey beams on the two sides of the upright post, and oppositely-pulling and fixing the Bailey beams on the two sides of the upright post together, so that the Bailey beams are tightly attached to the upright post; a cover beam bottom die is arranged between two adjacent upright columns, two ends of the cover beam bottom die are erected on the two upright columns, and the cover beam bottom die is fixed on the Bailey beam; the bailey beam is fixed on the underwater bearing platform through the steel buttress.

2. The hollowed-out bent cap support system according to claim 1, wherein: the steel buttress comprises a sand barrel, a steel pipe pile and coarse sand; the top of the steel pipe pile is fixedly arranged on the Bailey beam; the sand barrel is fixedly arranged on the underwater bearing platform and filled with coarse sand; the steel pipe pile is inserted into the sand barrel, and the bottom of the steel pipe pile is pressed on the coarse sand.

3. The hollowed-out bent cap support system according to claim 2, wherein: the sand barrel is provided with an unloading hole, and an unloading bolt is arranged in the unloading hole.

4. The hollowed-out bent cap support system according to claim 2, wherein: the steel buttress also comprises an installation lifting lug, and the installation lifting lug is fixedly installed on the sand bucket.

5. The hollowed-out bent cap support system according to claim 1, wherein: the bottom of the cover beam bottom die is fixed on the Bailey beam through the supporting section steel.