CN210461926U

CN210461926U - Modified buttress for reducing buttress volume at horizontal bending point of pressure pipeline

Info

Publication number: CN210461926U
Application number: CN201921441273.4U
Authority: CN
Inventors: 周燕; 张凯; 刘中宪; 穆伟
Original assignee: Tianjin Chengjian University
Current assignee: Tianjin Chengjian University
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-05-05
Anticipated expiration: 2029-08-30

Abstract

The utility model relates to a reduce modification buttress of horizontal bending point department buttress size of pressure pipeline, modification buttress include and build fashioned buttress body by the cast-in-place of concrete, the trapezoidal form of narrow back width before the buttress body is, be provided with the pipeline mounting groove on the place ahead inclined plane of buttress body, rear position cartridge at the buttress body is fixed with many shaped steel that are parallel arrangement, shaped steel perpendicular to buttress body, the latter half of shaped steel stretches out from the lower extreme of buttress body, form and expose the section, it buries the contact with the soil body formation to expose the section. The modified buttress effectively reduces the buttress volume, and improves the impact resistance and the environmental applicability.

Description

Modified buttress for reducing buttress volume at horizontal bending point of pressure pipeline

Technical Field

The utility model belongs to the technical field of pipeline under pressure buttress design, concretely relates to reduce modification buttress of pipeline under pressure level bending point department buttress size.

Background

According to the calculation theory of the pier structure design, when the caliber of the pipeline is less than 350mm, the test pressure is not more than 1.0MPa and the soil quality is better, or the bending angle of the pipeline is not more than 10 degrees, the pier can not be arranged. However, for the pipeline diameter larger than 350mm, the water pressure of the test water is more than 1.0MPa or less than 1.0MPa, the soil is soft, especially at the bending point of the vertical rotation or horizontal rotation of the water supply and drainage pipeline, because the water flow direction is changed and the water flow is blocked, the water pressure is out of balance, the resultant force of the axial water pressure of the interface in the pipeline pushes the pipeline wall, and the interface of the pipeline wall has the tendency of pulling off. Or in earthquake-prone zones, the shear strength of the soil is reduced by the earthquake, resulting in a reduction in passive soil pressure. In order to ensure the safe operation of the pipeline, a concrete buttress is required to be arranged at the position to transmit the hydraulic resultant force to the soil body, and the resultant force is balanced by the counterforce of the soil. If the calculated amount of the pier concrete is relatively large in areas with relatively high pressure or moderate and strong earthquakes, the land occupation of the large-volume concrete pier cannot be met by the terrain of the surrounding environment of the site, and the like, and the situation cannot be realized. No feasible solution has been proposed for the technical problems in the related aspects.

Through the search of the prior art, the technical scheme similar to the patent is not searched.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's weak point, provide a can effectively reduce buttress volume, improve impact resistance and environment suitability's the modification buttress and the construction method of reduction pressure pipeline horizontal buckling point department buttress volume.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a reduce modification buttress of pipeline under pressure level bend department buttress volume, includes and builds fashioned buttress body by cast-in-place of concrete, the wide trapezoidal form in narrow back before the buttress body is, is provided with pipeline mounting groove, its characterized in that on the place ahead inclined plane of buttress body:

the rear position cartridge of buttress body is fixed with many shaped steel that are parallel arrangement, and shaped steel perpendicular to buttress body, the latter half of shaped steel stretch out from the lower extreme of buttress body, forms the section that exposes, exposes the section and forms with the soil body and bury the contact.

And, the distance of shaped steel apart from buttress body back limit is 50 ~ 80cm, and the distance of the shaped steel on both sides apart from the corresponding side of buttress is 50 ~ 80 cm.

And the buttress body is made of C15 concrete.

And the section steel is channel steel or I-shaped steel.

The utility model has the advantages and positive effect:

1. this modification buttress is through add the shaped steel of perpendicular setting on former buttress body, forms vertical pile foundation, with the common atress of buttress body, improves conventional bulky concrete buttress structural style and atress mode, has reduced the volume of buttress, has improved its suitability.

2. The modified buttress arranges the profile steel at the rear of the concrete buttress, can resist a small amount of pipeline impact force by utilizing the friction resistance action of the small-volume concrete buttress arranged in front and the soil body, and reduces the impact force action on the profile steel structure behind the buttress; on the other hand, the structural style that the front part of the buttress is small and the rear part is large enables the rear size to be large, and the structural steel structure with more quantity is convenient to arrange so as to resist larger horizontal impact force.

3. This modification buttress adds for pure concrete buttress and establishes the shaped steel after, through the vertical resistance effect of shaped steel, has reduced the vertical load that the buttress concrete acted on the basis to make the buttress basis can be applicable to the complicated geological environment including soft soil foundation.

4. The shaped steel in this modification buttress adopts channel-section steel or I-steel structure, and these materials are the design product, are convenient for produce and purchase, and the shaped steel structure is convenient for require the cutting or connect long according to design length in addition, and steel construction material intensity is high, and anti deformability is strong, can adapt to powerful horizontal impact force effect, can be better resist the horizontal impact force that comes from pipeline under pressure.

5. The section steel in the modified buttress adopts a channel steel or I-steel structure, the section size can be increased or reduced as required, the length can be shortened or reduced as required by calculation, a liquefied soil layer can be penetrated, the modified buttress is suitable for frequent earthquake areas, the steel structure has good ductility, and the risk of the conventional buttress in the liquefaction failure of earthquake sand soil is overcome.

Drawings

FIG. 1 is a structural layout of the buttress of the present invention;

FIG. 2 is a front sectional view of the buttress of the present invention;

figure 3 is a side sectional view of an example buttress of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments, which are illustrative, not restrictive, and the scope of the invention should not be limited thereto.

A modified buttress for reducing the buttress size at the horizontal bending point of a pressure pipeline, please refer to fig. 1-3, comprises a buttress body 2 cast and molded by concrete in situ, wherein the concrete adopts C15 concrete, the buttress body is in a trapezoid shape with a narrow front part and a wide back part, a pipeline installation groove is arranged on the front inclined plane of the buttress body, and the invention points are as follows:

a plurality of section steels 1 which are arranged in parallel are inserted and fixed at the rear position of the buttress body, and the section steels are preferably channel steels or I-shaped steels. The profile steel is perpendicular to the buttress body, the lower half portion of the profile steel extends out of the lower end of the buttress body to form an exposed section, and the exposed section is in embedded contact with a soil body 4. The distance of shaped steel apart from buttress body back limit further takes 50 ~ 80cm, and this distance is marked with H1 in the drawing, and the shaped steel on both sides is further for 50 ~ 80cm apart from the distance that the buttress corresponds the side, and this distance is marked with H2 in the drawing to avoid under the water skin load effect, shaped steel structure peels off from buttress concrete.

The better application condition of the modified buttress is as follows: the pressure pipeline is between 300 and 600mm and is horizontally laid, and the bending angle is generally not more than 60 degrees of bent pipe. The minimum thickness of the soil at the back of the horizontal buttress should be greater than 3 times the depth of the pier bottom below the designed ground.

The construction method of the modified buttress comprises the following construction steps:

s1 after the foundation pit of installation pipeline under pressure excavates, insert shaped steel in the foundation pit, it is specific: inserting profile steel into the soil body at a rear set position at the horizontal bending point of the pre-installed pressure pipeline, wherein the lower half part of the profile steel is in contact with the soil body, the upper half part of the profile steel is exposed above the soil body, the profile steel is ensured to be vertically inserted, and the distance between the profile steels is consistent with the design distance;

s2, a formwork for pouring the buttress body is arranged in the foundation pit in a supporting mode, concrete is poured in the formwork and is solidified to form the buttress body, and the upper half portion of the section steel is buried in the concrete.

After the modified buttress construction is completed, the pressure pipeline 3 can be installed, the horizontal bending point of the pressure pipeline is in contact with the pipeline installation groove on the buttress body, and after the pressure pipeline is laid, the foundation pit is buried and compacted, so that the laying construction of the pipeline can be completed.

To sum up, the utility model discloses set up shaped steel structures such as channel-section steel or I-steel on concrete buttress basis, when the horizontal frictional resistance of buttress bottom can't resist the horizontal impact of the bending point that comes from pipeline under pressure and do all can, the buttress will transmit the pipeline impact force for on the shaped steel structures such as channel-section steel or I-steel of burying deeply in the original state soil body, then shaped steel structures such as channel-section steel or I-steel will this part impact force through self and the horizontal resistance dispersion between the soil body in the deep soil body. And the setting of shaped steel structure gives the buttress with vertical support effect, has reduced the vertical load of buttress concrete effect on the basis, has solved the difficult problem that the vertical bearing capacity of soft soil foundation buttress is not enough, is showing the practicality that improves complicated topography. Through the improvement of the form of the buttress, the concrete buttress size is obviously reduced, and the sufficient pre-buried space is provided for the surrounding pre-buried pipelines, so that the complex staggered pipeline pre-burying is not influenced, and the concrete buttress can be better adapted to complex environments.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims, and therefore, the scope of the present invention is not limited to the disclosure of the embodiments and the accompanying drawings.

Claims

1. The utility model provides a reduce modification buttress of pipeline under pressure level bend department buttress volume, includes and builds fashioned buttress body by cast-in-place of concrete, the wide trapezoidal form in narrow back before the buttress body is, is provided with pipeline mounting groove, its characterized in that on the place ahead inclined plane of buttress body: the rear position cartridge of buttress body is fixed with many shaped steel that are parallel arrangement, and shaped steel perpendicular to buttress body, the latter half of shaped steel stretch out from the lower extreme of buttress body, forms the section that exposes, exposes the section and forms with the soil body and bury the contact.

2. The modified pier for reducing the amount of piers at horizontal bends in pressure pipelines according to claim 1, wherein: the distance of shaped steel apart from buttress body back limit is 50 ~ 80cm, and the distance of the shaped steel on both sides apart from the corresponding side of buttress is 50 ~ 80 cm.

3. The modified pier for reducing the amount of piers at horizontal bends in pressure pipelines according to claim 1, wherein: the buttress body is made of C15 concrete.

4. The modified pier for reducing the amount of piers at horizontal bends in pressure pipelines according to claim 1, wherein: the section steel is channel steel or I-shaped steel.