阅读说明：本技术 一种解决超长结构应力的方法 (Method for solving stress of super-long structure ) 是由 曹历 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种解决超长结构应力的方法：铺设底部模板,设置侧面模板,侧面模板与底部模板围绕形成浇筑空间；在浇筑空间内的长轴方向的一端设置一块竖直的分隔模板,分隔模板将浇筑空间分为先浇区、后浇区；向先浇区内竖直插入若干预应力杆,盖上顶部模板；向先浇区内浇筑结构件主体部分的混凝土,浇筑完成后立即向各预应力杆施加恒定的、向上的拉力,该拉力不会将预应力杆从先浇区内拔出；静置,拔出所有预应力杆；向后浇区内浇筑后浇带混凝土,静置。本发明用以解决现有技术中超长结构件难以在不干扰各位置承载强度的前提下准确设置足够的应力槽来解决结构应力干扰的问题,实现在浇筑施工过程中减少超长结构件的结构应力干扰的目的。(The invention discloses a method for solving the stress of an overlong structure, which comprises the following steps: laying a bottom formwork, arranging a side formwork, and forming a pouring space by surrounding the side formwork and the bottom formwork; arranging a vertical partition template at one end in the long axis direction in the pouring space, wherein the partition template divides the pouring space into a first pouring area and a second pouring area; vertically inserting the intervention stress rod into the pre-pouring area, and covering a top template; pouring concrete of the main body part of the structural member into the early-pouring area, and immediately applying constant and upward tensile force to each prestressed rod after pouring is finished, wherein the prestressed rods cannot be pulled out from the early-pouring area by the tensile force; standing, and pulling out all the prestressed rods; and pouring post-cast strip concrete into the post-cast area, and standing. The invention is used for solving the problem that the super-long structural member in the prior art is difficult to accurately arrange enough stress grooves on the premise of not interfering the bearing strength of each position to solve the structural stress interference, and achieves the purpose of reducing the structural stress interference of the super-long structural member in the pouring construction process.)

1. A method for solving the stress of an overlong structure is characterized by comprising the following steps:

(a) paving a bottom formwork (1), arranging a circle of side formwork (2) on the bottom formwork (1), and forming a pouring space by surrounding the side formwork (2) and the bottom formwork (1);

(b) a vertical partition template (3) is arranged at one end in the long axis direction in the pouring space, and the pouring space is divided into a first pouring area (4) and a second pouring area (5) by the partition template (3); vertically inserting a plurality of intervening stress rods (6) into the pre-pouring area (4), and covering a top template (7);

(c) pouring concrete of the main body part of the structural member into the early pouring area (4), and immediately applying constant and upward tensile force to each prestressed rod (6) after pouring is finished, wherein the prestressed rods (6) cannot be pulled out from the early pouring area (4) by the tensile force;

(d) standing for N/5-N/4 of the time, and pulling out all the prestressed rods (6), wherein N is the initial setting time of the concrete poured in the first pouring area (4);

(e) pouring post-cast strip concrete into the post-cast zone (5), and standing for M/8-M/6 of the time, wherein M is the initial setting time of the post-cast strip concrete;

(f) and (4) disassembling and taking out the partition template (3), standing, maintaining and demolding.

2. The method for solving the stress of the ultra-long structure according to claim 1, wherein an expanding agent is added into the post-cast strip concrete.

3. A method for solving the stress of an overlength structure according to claim 1, wherein the upper surface of the bottom form (1) and the lower surface of the top form (7) are provided with a plurality of ribs (8).

4. A method for solving the stress of an overlength structure according to claim 1, wherein the partition form (3) is connected with a side form (2) through a split bolt (9), only one nut (10) is arranged on the split bolt (9), and the nut (10) is positioned in the outer direction of the side form (2).

5. A method of resolving ultra-long structural stresses as claimed in claim 1, characterised in that the pre-stressing rods (6) are movable through the top formwork (7).

6. A method for solving the stress of an overlength structure according to claim 5, wherein the prestressed bars (6) are screwed to the top formwork (7).

7. A method for solving the stress of an overlength structure according to claim 1, wherein the partition form (3) is movable through the top form (7).

Technical Field

The invention relates to the field of structural stress, in particular to a method for solving the stress of an overlong structure.

Background

The structural stress belongs to permanent stress, has a more important position in the field of civil engineering, and needs design and constructors to fully consider the influence of the structural stress on strength and bearing. In the prior art, a method for responding to structural stress generally comprises the steps of arranging structures such as stress grooves and stress belts, and reserving sufficient space for releasing structural stress in the later period through structural distribution. However, for an ultra-long member having a length of more than 10m, since the member has a large length and the strength varies from place to place in the long axis direction, the calculation of the distribution positions of the required stress grooves is difficult, and it is difficult to accurately provide sufficient stress grooves without disturbing the bearing strength at each position.

Disclosure of Invention

The invention aims to provide a method for solving the stress of an overlong structure, which aims to solve the problem that the overlong structural member in the prior art is difficult to accurately arrange enough stress grooves on the premise of not interfering the bearing strength of each position so as to solve the structural stress interference and realize the purpose of reducing the structural stress interference of the overlong structural member in the pouring construction process.

The invention is realized by the following technical scheme:

a method for solving the stress of an overlong structure comprises the following steps:

(a) paving a bottom template, arranging a circle of side templates on the bottom template, and forming a pouring space by the side templates and the bottom template in a surrounding manner;

(b) arranging a vertical partition template at one end in the long axis direction in the pouring space, wherein the partition template divides the pouring space into a first pouring area and a second pouring area; vertically inserting the intervention stress rod into the pre-pouring area, and covering a top template;

(c) pouring concrete of the main body part of the structural member into the early-pouring area, and immediately applying constant and upward tensile force to each prestressed rod after pouring is finished, wherein the prestressed rods cannot be pulled out from the early-pouring area by the tensile force;

(d) standing for N/5-N/4 of the time, and pulling out all the prestressed rods, wherein N is the initial setting time of the concrete poured in the first pouring area;

(e) pouring post-cast strip concrete into the post-cast zone, and standing for M/8-M/6 of the time, wherein M is the initial setting time of the post-cast strip concrete;

(f) and (4) disassembling and taking out the partition template, standing, maintaining and demolding.

Aiming at solving the problem that the ultra-long structural member in the prior art is difficult to accurately set enough stress grooves to solve the structural stress interference on the premise of not interfering the bearing strength of each position, the invention provides a method for solving the stress interference of the ultra-long structure, which comprises the steps of firstly laying a bottom template, arranging a circle of side templates on the bottom template, and forming a pouring space by surrounding the side templates and the bottom template; wherein the side formwork and the bottom formwork are connected or fixed through any existing mode. The method is characterized in that a vertical partition template is arranged at one end in the long axis direction in a pouring space, and the pouring space is divided into a first pouring area and a second pouring area by the partition template; and vertically inserting the interference stress rod into the pre-pouring area, and covering the top template. Because the division board is located the one end of the major axis direction in the space of pouring, it is the first area of watering promptly, the back area volume is unequal, regard as the first area of watering with the one side that the volume is bigger, regard as the back area of watering with the one side that the volume is smaller. And a plurality of prestressed rods are vertically inserted into the pre-cast area, and the prestressed rods can contact the bottom template and can also be suspended and inserted into the pre-cast area in any mode. Then pouring concrete of the main body part of the structural member in the early pouring area, and immediately applying constant and upward tensile force to each prestressed rod after pouring is finished, wherein the prestressed rods cannot be pulled out from the early pouring area by the tensile force; in the method, after the cast of the early casting area, constant tension is immediately applied to the prestressed rod, the tension needs to be kept constant, but the tension cannot be too large, and the prestressed rod cannot be pulled out of the early casting area, so that aiming at different concrete systems, a person skilled in the art should determine the tension range by himself, and can test the concrete of the batch before construction to find out the optimal tension range, so that the prestressed rod is always tensioned, but the tension is not enough to overcome the static friction resistance of the concrete to the prestressed rod. The method provides vertical pulling force for the overlong structural member, the overlong structural member is kept for N/5-N/4 of the time, the pulling force is kept stable at the initial pouring stage, so that the structural stress in the horizontal direction is damaged through the upward pulling force, the expansion direction of cement paste is guided to face upwards, and the structural stress direction is basically upward. And for the ultra-long structural member, the stress direction is mainly the upper load, so the method can enhance the compressive strength and improve the bearing capacity by utilizing the structural stress guided out longitudinally through the tensile force maintained at the initial solidification stage. After the prestressed rod is pulled out, pouring post-cast strip concrete into the post-cast zone, and standing for M/8-M/6 of the time, wherein M is the initial setting time of the post-cast strip concrete; and after upward structural stress is generated in the concrete in the early casting area, the prestressed rods are pulled out, the space in the later casting area is cast, and the concrete in the later casting area keeps the transverse stability of the overlong structural member. And the separation template is detached and taken out after the time of standing for M/8-M/6, so that the concrete in the pre-cast area can be fused with the concrete in the post-cast area as soon as possible when the concrete is not initially set, and the pre-cast area and the post-cast area form an integral component after being cured. And finally, standing, maintaining and demolding. The problem that the structure stress interference is solved by accurately setting enough stress grooves on the premise that the bearing strength of each position is not interfered by an overlong structural member in the prior art can be solved, and the purpose of reducing the structure stress interference of the overlong structural member in the pouring construction process is achieved. The ultra-long structure described in the application refers to a structural member with a length greater than 10 m.

And adding an expanding agent into the post-cast strip concrete. The interference of the structural stress on the overall strength is reduced by increasing the expansion effect of the concrete system.

The upper surface of bottom template, the lower surface of top template all set up a plurality of beads. After the pouring is finished, stress grooves are formed at the convex edges, and further the reduction of structural stress interference is assisted.

The separation template is connected with a side template through a split bolt, only one nut is arranged on the split bolt, and the nut is located in the outer side direction of the side template. The split bolt can be taken out and the separating template can be pulled out by disassembling the nut from the outer side of the side template, so that the process of disassembling and taking out the separating template by the method is completely operated outside, and the inner concrete cannot be influenced.

The prestressed rods movably penetrate through the top formwork.

The prestressed rod is connected with the top template through threads.

The partition template movably passes through the top template.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the method for solving the stress of the super-long structure can solve the problem that the super-long structure with the length of more than 10m in the prior art is difficult to accurately arrange enough stress grooves to solve the structural stress interference on the premise of not interfering the bearing strength of each position, and achieves the purpose of reducing the structural stress interference of the super-long structure in the pouring construction process.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

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

Reference numbers and corresponding part names in the drawings:

1-bottom template, 2-side template, 3-partition template, 4-first pouring area, 5-later pouring area, 6-prestressed rod, 7-top template, 8-rib, 9-split bolt and 10-nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.