CN110130280B

CN110130280B - Cantilever bracket concrete lower template and support frame dismantling method

Info

Publication number: CN110130280B
Application number: CN201910413752.3A
Authority: CN
Inventors: 李永山; 杨彪; 陈猛; 周佳骏; 马福海; 于庆
Original assignee: Sinohydro Bureau 5 Co Ltd
Current assignee: Sinohydro Bureau 5 Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2022-04-01
Anticipated expiration: 2039-05-17
Also published as: CN110130280A

Abstract

The invention discloses a method for dismantling a lower template and a support frame of cantilever bracket concrete, which comprises the following steps: after pouring the gate pier concrete to a specified elevation, embedding a steel column in advance; after the gate pier is constructed to the bracket elevation, a positioning cone is installed, and a prefabricated operating platform is installed on the positioning cone; installing a template and a steel bar, fixing the template to the steel column through a tie bar, and embedding a vertical steel pipe before pouring the bracket to form a preformed hole; after the strength of the concrete reaches the stripping strength, removing the lower template and the support frame of the cantilever bracket and stacking the lower template and the support frame on the operation platform; a winch is arranged on the top of the cantilever corbel concrete; a steel wire rope of the winch penetrates through the reserved hole, and the winch is used for stably unloading the operating platform to the ground; and (5) plugging the reserved holes to finish the bracket construction. The method of the invention ensures that the construction of the cantilever bracket concrete is safer and faster.

Description

Cantilever bracket concrete lower template and support frame dismantling method

Technical Field

The invention relates to the field of concrete construction of water conservancy and hydropower structures, in particular to a method for dismantling a lower template and a support frame of cantilever corbel concrete.

Background

According to introduction of water conservancy and hydropower construction organization design and other related data, the construction scheme of cantilever corbel concrete pouring in hydropower construction in China includes construction modes such as precast concrete template internal pulling type, internal pulling type templates, tripod support type and the like. After the cantilever bracket concrete construction is finished, due to the overlong cantilever part, the disassembly of the bracket bottom die template and the outer support frame has larger construction difficulty and safety risk, and the lower part of the bracket is difficult to arrange corresponding equipment for template disassembly.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for removing a lower formwork and a support frame of cantilever corbel concrete, so that the cantilever corbel concrete construction is safer and faster.

In order to solve the technical problems, the invention adopts the technical scheme that:

a method for dismantling a lower template and a support frame of cantilever bracket concrete comprises the following steps:

step 1: after pouring the gate pier concrete to a specified elevation, embedding a steel column in advance;

step 2: after the gate pier is constructed to the bracket elevation, a positioning cone is installed, and a prefabricated operating platform is installed on the positioning cone;

and step 3: installing a template and a steel bar, fixing the template to the steel column through a tie bar, and embedding a vertical steel pipe before pouring the bracket to form a preformed hole;

and 4, step 4: after the strength of the concrete reaches the stripping strength, removing the lower template and the support frame of the cantilever bracket and stacking the lower template and the support frame on the operation platform;

and 5: a winch is arranged on the top of the cantilever corbel concrete;

step 6: a steel wire rope of the winch penetrates through the reserved hole, and the winch is used for stably unloading the operating platform to the ground;

and 7: and (5) plugging the reserved holes to finish the bracket construction.

Further, step 1 still includes, pre-buried anchor bar is in the gate pier concrete to connect the steel column in the anchor bar through the lacing wire, stabilize the steel column.

Further, the steel column is made of I-shaped steel.

Furthermore, a plurality of tie bars for fixing the template and a plurality of tie bars for fixing the steel column are uniformly connected to the steel column.

Compared with the prior art, the invention has the beneficial effects that:

1) adopt prefabricated suspension type operation platform to reduce the risk that operation platform set up, improved the security and dismouting simple and convenient.

2) The reserved holes are adopted for dismantling the bracket template and the operation platform, and the problem of difficulty in equipment arrangement when the large cantilever bracket cantilever part is dismantled is solved.

3) The construction method is suitable for the construction of the large cantilever bracket with higher height, the resource investment is less, the construction progress is fast, and the construction cost and the management cost are reduced.

Drawings

FIG. 1 is a schematic view of a cantilever corbel concrete lower formwork and a support frame dismantling method of the invention.

In the figure: 1-steel column; 2-positioning a cone; 3-operating the platform; 4-template and frame pipe; 5-a steel pipe; 6-a winch; 7-anchor bars; 8-stretching the tendon.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

1. Bracket pouring layering

The bracket construction layering is determined according to a support system. And (3) embedding a positioning cone 2 (selecting a proper positioning cone according to construction load) on the side surface of the concrete, and embedding a steel column 1 when the concrete is poured to the last layer below the bracket.

2. Installation construction platform

After the gate pier is constructed to the bracket elevation, the prefabricated operating platform 3 is installed by using the positioning cone 2. The operating platform 3 is made of channel steel, and a suspension fastener is reserved in the support and can be directly suspended on the positioning cone 2.

3. Formwork and support frame

Installing templates and reinforcing steel bars, installing an operating platform 3 by utilizing the embedded positioning cones 2, erecting template supporting scaffold installing templates, and embedding the templates before pouring corbels

The steel pipe 5 is provided with holes, and the bracket inclined section template is constructed by adopting a hanging mould and a steel template. The construction of the bracket template comprises the following steps: in a concrete block with bracket starting point elevation poured in the dam body, a steel column 1 (I20I-steel is generally adopted), the distance between the steel column 1 and the edge of the formwork is 0.5m, the distance between the steel column 1 and the formwork is 1.0m, and the burial depth is 1.5 m. By using

The steel bar (tie bar 8) ties the template on the steel column1, the row spacing between the lacing wires 8 is 0.5 m. In order to ensure that the embedded steel column 1 has enough formwork tie strength, the next layer of concrete can be poured 7 days after each layer of concrete is poured, tie bars 8 for fixing the steel column 1 are further arranged and tie on the concrete embedded anchor bars 7 along the opposite direction of the tie bars 8 for fixing the formwork, and the stress safety and stability of the steel column 1 are ensured.

The bracket overhanging part is poured and layered by 1.5m, and the row spacing between the steel pipe back frames is 0.5 m. And 8 tie bars of each pouring layer are arranged in three rows, the height of the embedded steel column 1 is 4.5m (excluding the embedding depth), the embedding depth is 1.5m, the distance is 1m, and the bracket overhanging template is installed and poured in layers at one time.

In order to ensure the overall stability of the formwork system and convenient operation, the simple external support bracket is arranged in the formwork installation process and used for installing and supporting the formwork, and the support is only protected by the operating platform 3 and is not used as a bearing scaffold during concrete pouring.

4. Removal of form and outer bracket

And after the strength of the concrete reaches the form removal strength, dismantling the bracket template and the support frame, manually dismantling the template and the outer support frame, stacking the materials on the prefabricated operation platform 3 after dismantling the template and the support frame by using the installed operation platform 3 as an operation layer, and bundling the materials on the operation platform 3 after dismantling.

And 1, installing a 10t winch 6 at the top of the bracket, penetrating out the steel wire rope through the reserved hole, and stably unloading the construction materials and the operating platform 3 to the ground at one time by adopting the 10t winch 6.

5. Hole sealing

And plugging the reserved holes.

Claims

1. A method for removing a lower template and a support frame of cantilever bracket concrete is characterized by comprising the following steps:

step 1: after pouring the gate pier concrete to a specified elevation, embedding a steel column (1); embedding anchor bars (7) in the gate pier concrete, connecting the steel column (1) to the anchor bars (7) through tie bars (8) to stabilize the steel column (1), wherein a plurality of tie bars (8) used for fixing a template and a plurality of tie bars (8) used for fixing the steel column (1) are uniformly connected to the steel column (1);

step 2: after the gate pier is constructed to the bracket elevation, a positioning cone (2) is installed, and a prefabricated operating platform (3) is installed on the positioning cone (2);

and step 3: installing a template and a steel bar, fixing the template to the steel column (1) through a tie bar (8), and embedding a vertical steel pipe (5) before pouring the bracket to generate a preformed hole;

and 4, step 4: after the strength of the concrete reaches the stripping strength, removing the lower template and the support frame of the cantilever bracket and stacking the template and the support frame on the operation platform (3);

and 5: a winch (6) is arranged at the top of the cantilever corbel concrete;

step 6: a steel wire rope of the winch (6) penetrates through the reserved hole, and the winch (6) is used for stably unloading the operating platform (3) to the ground;

and 7: and (5) plugging the reserved holes to finish the bracket construction.

2. The cantilever corbel concrete lower form and support frame dismantling method according to claim 1, wherein the steel column (1) is made of i-steel.