阅读说明：本技术 一种管道回填的结构及其施工方法 (Pipeline backfilling structure and construction method thereof ) 是由 付增龙 刘尧 赵兴坤 于 2021-09-16 设计创作，主要内容包括：本发明公开了一种管道回填的结构,包括位于沟槽最底部的碎石层和管道,其特征在于,碎石层上方铺设有第一中粗砂层,第一中粗砂层上放置有滤水网隔板,滤水网隔板内填充有第二中粗砂层,第二中粗砂层上方放置有管道,管道两侧浇筑有第一泡沫混凝土层至管道顶部100-150mm处,在第一泡沫混凝土层上方放置横向钢板,在横向钢板上浇筑第二泡沫混凝土层,在第一泡沫混凝土层与第二泡沫混凝土层的层面上均涂有防水材料,在第二泡沫混凝土上铺设陶粒混凝土,解决雨水流经砂层之间,导致压实度不高的砂层下沉,从未出现地面塌陷的问题。(The invention discloses a pipeline backfilling structure which comprises a gravel layer and a pipeline, wherein the gravel layer is positioned at the bottommost part of a groove, and the pipeline backfilling structure is characterized in that a first middle coarse sand layer is laid above the gravel layer, a water filter screen clapboard is placed on the first middle coarse sand layer, a second middle coarse sand layer is filled in the water filter screen clapboard, the pipeline is placed above the second middle coarse sand layer, a first foam concrete layer is poured on two sides of the pipeline to the position of 100-150mm away from the top of the pipeline, a transverse steel plate is placed above the first foam concrete layer, a second foam concrete layer is poured on the transverse steel plate, waterproof materials are respectively coated on the first foam concrete layer and the second foam concrete layer, and ceramsite concrete is laid on the second foam concrete layer, so that the problems that the rainwater flows between the sand layers, the low-compaction-degree sand layer sinks, and the ground collapses never occurs are solved.)

1. A structure for backfilling pipeline comprises a crushed stone layer (2) at the bottommost part of a groove and a pipeline (1), and is characterized in that,

the water-proof concrete pipeline is characterized in that a first medium coarse sand layer (3) is laid above the gravel layer (2), a water strainer partition plate (4) is placed on the first medium coarse sand layer (3), a second medium coarse sand layer (5) is filled in the water strainer partition plate (4), the pipeline (1) is placed above the second medium coarse sand layer (5), a first foam concrete layer (10) is poured on two sides of the pipeline (1) to the position of 100mm and 150mm on the top of the pipeline (1), a transverse steel plate (9) is placed above the first foam concrete layer (10), a second foam concrete layer (11) is poured on the transverse steel plate (9), waterproof materials are coated on the layers of the first foam concrete layer (10) and the second foam concrete layer (11), and a concrete ceramsite layer (12) is laid on the second foam concrete layer (11).

2. The pipeline backfilling structure according to claim 1, wherein an arc-shaped supporting block (6) matched with the pipeline (1) is connected below the pipeline (1), and inclined strut steel plates are connected to two sides of the arc-shaped supporting block (6).

3. A structure for backfilling a pipeline according to claim 2, wherein the free ends of said two inclined strut steel plates are respectively connected with the two ends of said transverse steel plate (9).

4. A structure for backfilling of pipelines according to claim 1, characterized in that an annular steel frame is attached to the outer wall of said pipeline (1).

5. A structure for backfilling of pipelines according to claim 4, wherein the pipeline (1) is wrapped with geotextile (7), and the geotextile (7) is arranged between the outer wall of the pipeline (1) and the ring steel frame.

6. A structure for backfilling pipelines according to claim 5, wherein the external surface of the pipeline (1) is corrugated, and the ring-shaped steel frame is located between two adjacent wave crests on the external surface of the pipeline (1).

7. The construction method for backfilling the pipeline is characterized by comprising the following specific steps of:

s1: digging a groove according to the size of the pipeline (1), and paving a crushed stone layer (2) after the groove bottom is leveled;

s2: a first medium coarse sand layer (3) is laid above the crushed stone layer (2), and a water filter screen clapboard (4) is arranged on the first medium coarse sand layer (3);

s3: filling a second medium coarse sand layer in the water filter screen partition plate (4) for tamping for 3 times to achieve the compaction degree of 90%, wherein the thickness of the second medium coarse sand layer (5) is at least 50mm greater than that of the water filter screen partition plate (4);

s4: placing the arc-shaped supporting block on the second medium coarse sand layer (5), and then placing the pipeline (1) in the arc-shaped supporting block;

s5; the pipeline (1) is wrapped with geotextile (7), and the outer wall of the pipeline (1) is connected with an annular steel frame for fixing the geotextile (7);

s6: carrying out a water-closing experiment;

s7: after the water closing test is successful, diagonal bracing steel plates (8) are welded on two sides of the arc-shaped supporting block;

s8: symmetrically pouring first foam concrete on two sides of the pipeline (1) to the position of at least 100-150mm away from the top of the pipeline (1);

s9: coating a waterproof material on the first foam concrete, placing a transverse steel plate (9) on the waterproof material, and welding two ends of the transverse steel plate with free ends of the two inclined strut steel plates;

s10, pouring second foam concrete on the transverse steel plate (9) to a position which is 650mm-800mm above the top of the pipeline (1);

s11: performing subsequent surface construction above the second foam concrete;

s12: and filling ceramsite concrete above the second foam concrete.

Technical Field

The invention relates to the field of municipal engineering, in particular to a pipeline backfilling structure and a construction method thereof.

Background

Along with global climate change, urban waterlogging disasters frequently occur, and the attention degree of urban waterlogging prevention and sewage quality and efficiency improvement work is improved all over the country, so that flexible pipes represented by buried plastic drain pipes are widely applied to various pipe network reconstruction projects. Compared with the traditional concrete drainage pipeline, the plastic drainage pipeline has the advantages of light weight, small water resistance coefficient, corrosion resistance, good tightness, convenient transportation and installation, high construction speed and the like, and can meet the construction requirements under severe operation conditions of busy traffic, narrow pipe position and operation surface, rapid construction and the like in a built-up area in the market;

however, in recent years, underground pipelines are subjected to bending deformation, cracking and damage under the action of vibration loads such as traffic loads and construction, so that the pipelines are failed, and the two sides of the pipelines are backfilled only by manual tamping, but the compaction degree of backfilled soil is difficult to be ensured to reach the specification by the manual tamping forming mode, so that the bearing capacity of backfilled parts cannot meet the use requirements; when heavy rain occurs, rainwater flows through the sand layers, so that the sand layers with low compactness are sunken, the problem of ground collapse is solved, and the pipeline is also soaked in water to generate large influence.

Disclosure of Invention

The invention aims to provide a pipeline backfilling structure and a construction method thereof, which are used for solving the problems that a sand layer with low compactness sinks and the ground is never collapsed due to the fact that rainwater flows between sand layers.

The invention is realized by the following technical scheme:

a pipeline backfilling structure comprises a gravel layer and a pipeline, wherein the gravel layer is located at the bottommost portion of a groove, a first medium coarse sand layer is laid above the gravel layer, a water strainer partition plate is placed on the first medium coarse sand layer, a second medium coarse sand layer is filled in the water strainer partition plate, the pipeline is placed above the second medium coarse sand layer, a first foam concrete layer is poured on the two sides of the pipeline to the position of 100-150mm away from the top of the pipeline, a transverse steel plate is placed above the first foam concrete layer, a second foam concrete layer is poured on the transverse steel plate, waterproof materials are coated on the first foam concrete layer and the second foam concrete layer, and ceramsite concrete is laid on the second foam concrete layer.

When the existing life is related to the pipeline backfill technology, the pipeline is usually buried by directly laying a sand layer, when the sand layer is tamped, the pipeline is damaged due to excessive vibration tamping by machinery, only the tamping degree of the 150mm position on the top of the pipeline is higher, gaps among sand grains are smaller, when rainwater flows through the sand layer around the pipeline, the tamping degree of the sand layer around the pipeline is lower, the gaps among the sand grains are larger, the compaction degree is lower, the rainwater can reduce the gaps among the sand grains to generate a certain hollow part, the danger of ground collapse can be caused at the moment, the pressure generated by traffic load can also increase the pipeline pressure, and deformation can be generated for a long time.

According to the invention, the first medium coarse sand layer is arranged on the crushed stone layer, the crushed stone layer has higher hardness, so that sinking is difficult to occur, and the first medium coarse sand layer arranged on the crushed stone layer is thinner and softer, so that the water strainer separator plate can be prevented from being damaged by edges and corners of the crushed stone layer; dividing the foam concrete into first foam concrete and second foam concrete for laying twice, and coating polymer high-molecular waterproof materials on the surfaces of the first foam concrete and the second foam concrete; when heavy rain occurs, rainwater can be placed into the second foam concrete layer above the top of the pipeline to enter the foam concrete layer due to the fact that the second foam concrete layer is coated with waterproof materials, the transverse steel plate between the first foam concrete layer and the second foam concrete layer can play a role in bearing, the foam concrete layer also has a certain bearing effect, the double-bearing effect is achieved, the problem that the ground collapses due to the fact that a sand layer sinks downwards when encountering water is avoided, the pressure applied to the pipeline by the ground can be relieved, the foam concrete layer also has certain heat preservation capacity and cannot be affected by severe cold and severe summer heat, if the waterproof effect of the second foam concrete is gradually reduced along with the time, the first foam concrete can continuously play a role of the second foam concrete, the pipeline is prevented from sinking, and the use of the pipeline is prolonged.

Further, the below of pipeline be connected with pipeline matched with arc supporting shoe, arc supporting shoe both sides all are connected with the bracing steel sheet, two the free end of bracing steel sheet respectively with the both ends of horizontal steel sheet are connected, during vibration load such as traffic load, construction on ground, horizontal steel sheet and the steel sheet of bracing steel form the steel sheet of falling triangle-shaped, the stress of falling triangle-shaped can bear various complicacy atress condition, and the atress can effectively transmit, and when horizontal steel sheet received the vibration impact, the accessible bracing steel sheet carried out the component force, and such decomposition can not make the steel sheet of both sides of falling triangle-shaped produce the bending phenomenon, and this is that regular triangle-shaped steel sheet can't accomplish.

Further, be connected with annular steelframe on the outer wall of pipeline, annular steelframe on the pipeline outer wall can produce certain bearing effect to the pressure of extrusion pipeline, avoids the pipeline under the effect of pressure and by extrusion deformation.

Further, the pipeline is wrapped with the geotextile, the geotextile is arranged between the outer wall of the pipeline and the annular steel frame, the geotextile wraps the pipeline and can effectively provide lateral restraint, the deformation and the damage of the pipeline in the vibration process are limited, the geotextile is tightly fixed on the outer wall of the pipeline while the deformation of the pipeline is limited through the annular steel frame, and the geotextile is prevented from sliding off.

Furthermore, the outer surface of the pipeline is corrugated, the annular steel frame is located between two adjacent wave crests, if the annular steel frame is located on the wave crests, the pipeline is uneven, the stability of the pipeline is directly influenced, and when the annular steel frame is located between the two adjacent wave crests, the thickness of the annular steel frame is compensated by the height difference between the wave troughs and the wave crests, so that the pipeline can be supported without deformation under the condition of keeping the stability.

The construction method for backfilling the pipeline comprises the following specific steps:

s1: digging a groove according to the size of the pipeline, and paving a crushed stone layer after leveling the bottom of the groove;

s2: a first medium coarse sand layer is laid above the crushed stone layer, and a water filter screen partition plate is placed on the first medium coarse sand layer;

s3: filling a second medium coarse sand layer in the water filtering screen partition plate for tamping for 3 times to achieve the compaction degree of 90%, wherein the thickness of the second medium coarse sand layer is at least 50mm larger than that of the water filtering screen partition plate;

s4: placing the arc-shaped supporting block on the second medium coarse sand layer, and then placing the pipeline into the arc-shaped supporting block;

s5; the pipeline is wrapped with geotextile, and the outer wall of the pipeline is connected with an annular steel frame for fixing the geotextile;

s6: carrying out a water-closing experiment;

s7: after the water closing test is successful, welding diagonal bracing steel plates on two sides of the arc-shaped supporting block;

s8: symmetrically pouring first foam concrete on two sides of the pipeline to the position of at least 100-150mm away from the top of the pipeline;

s9: waterproof material is coated on the first foam concrete, a transverse steel plate is placed on the waterproof material, two ends of the transverse steel plate are welded with free ends of two inclined strut steel plates to form a similar inverted isosceles triangle after welding, the angles of two isosceles sides are 40 degrees, if the angle is smaller than 40 degrees, after the transverse steel plate is pressed by gravity, the resultant force formed by the supporting force of the two inclined strut steel plates to the transverse steel plate cannot reach the optimal value, and if the angle is larger than 40 degrees, the arc-shaped supporting block cannot bear the force to achieve the maximum effect when the pressure is decomposed.

S10, pouring second foam concrete on the transverse steel plate to a position which is 650mm-800mm above the top of the pipeline;

s11: performing subsequent surface construction above the second foam concrete;

s12: and (3) filling ceramsite concrete above the second foam concrete, and rolling and tamping for 4 times by using a machine to ensure that the compaction degree reaches 96%.

At least 100-150mm from the first foam concrete to the top of the pipeline in step S8, when the transverse steel pipe is placed, the transverse steel pipe is pressed to the first foam concrete which is just solidified and moved to 70-90 mm and then is stable due to the influence of the gravity of the transverse steel pipe, if the transverse steel pipe is smaller than 100mm, the transverse steel plate is pressed onto the pipeline, so that the pressure of the pipeline is enhanced, the transverse steel plate plays a certain bearing role, and if the transverse steel plate is pressed onto the pipeline, all the gravity borne by the transverse steel plate is also applied to the pipeline, so that the pipeline is damaged; if the thickness is larger than 150mm, the welding cannot be well welded with the inclined strut steel plate, so that the best bearing force dividing point cannot be reached.

Step S10, pouring second foam concrete on the transverse steel plate to a position 650mm-800mm above the top of the pipeline, wherein if the distance is smaller than 650m, good bearing effect cannot be achieved, if the distance is larger than 800mm, the transverse steel plate can bear more gravity, and preferably the bearing effect at the position 700mm is the best.

The construction method can effectively enhance the resistance of the pipeline to displacement generated by uneven settlement of the foundation, control the vertical deformation rate of the pipeline within a small range, and avoid the danger that the space between sand grains is reduced by rainwater to generate a certain hollow part to cause ground collapse in heavy rain, and the pressure generated by traffic load can also increase the pressure of the pipeline to generate deformation in the long term.

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

1. according to the invention, the first medium coarse sand layer is laid above the gravel layer, the water filter screen partition plate is placed on the first medium coarse sand layer, the second medium coarse sand layer is filled in the water filter screen partition plate, the pipeline is placed above the second medium coarse sand layer, the first foam concrete layers are poured on two sides of the pipeline to the position of 150mm away from the top of the pipeline, the transverse steel plate is placed above the first foam concrete layer, the second foam concrete layer is poured on the transverse steel plate, the waterproof materials are respectively coated on the first foam concrete layer and the second foam concrete layer, and the ceramsite concrete is laid on the second foam concrete layer, so that the problems that the sand layer with low compactness sinks and the ground sinks never occur due to rainwater flowing between the sand layers are solved.

2. According to the invention, the arc-shaped supporting block matched with the pipeline is connected below the pipeline, the inclined strut steel plates are connected to two sides of the arc-shaped supporting block, the free ends of the two inclined strut steel plates are respectively connected with two ends of the transverse steel plate, and the transverse steel plate and the inclined strut steel plates form the inverted triangle steel plate.

3. According to the invention, the annular steel frame is connected to the outer wall of the pipeline, and the annular steel frame on the outer wall of the pipeline can generate a certain bearing effect on the pressure of extruding the pipeline, so that the pipeline is prevented from being extruded and deformed under the action of the pressure.

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 cross-sectional view of a backfill structure for pipelines according to the present invention;

FIG. 2 is a schematic flow chart of a pipeline backfilling method according to the present invention;

reference numbers and corresponding part names in the drawings:

the concrete comprises, by weight, 1-a pipeline, 2-a gravel layer, 3-a first medium coarse sand layer, 4-a water strainer partition, 5-a second medium coarse sand layer, 6-an arc-shaped supporting block, 7-geotextile, 8-an inclined strut steel plate, 9-a transverse steel plate, 10-a first foamed concrete layer, 11-a second foamed concrete layer and 12-a ceramsite concrete layer.

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.

Example (b):

as shown in fig. 1 and 2, the invention comprises a gravel layer 2 and a pipeline 1 which are positioned at the bottommost part of a groove, a first middle coarse sand layer 3 is laid above the gravel layer 2, a water strainer separator plate 4 is placed on the first middle coarse sand layer 3, a second middle coarse sand layer 5 is filled in the water strainer separator plate 4, the pipeline 1 is placed above the second middle coarse sand layer 5, a first foam concrete layer 10 is poured on two sides of the pipeline 1 to the position of 100-150mm away from the top of the pipeline 1, a transverse steel plate 9 is placed above the first foam concrete layer 10, a second foam concrete layer 11 is poured on the transverse steel plate 9, waterproof materials are respectively coated on the first foam concrete layer 10 and the second foam concrete layer 11, ceramsite concrete is laid on the second foam concrete layer, an arc-shaped supporting block 6 matched with the pipeline 1 is connected below the pipeline 1, the two sides of the arc-shaped supporting block 6 are both connected with diagonal bracing steel plates, the free ends of the two diagonal bracing steel plates are respectively connected with the two ends of the transverse steel plate 9, an annular steel frame is connected to the outer wall of the pipeline 1, geotextile 7 wraps the pipeline 1, the geotextile 7 is arranged on the outer wall of the pipeline 1 and between the annular steel frames, the outer surface of the pipeline 1 is corrugated, and the annular steel frames are located between two adjacent wave crests.

The method comprises the following specific implementation steps:

s1: digging a groove according to the size of the pipeline 1, and paving a crushed stone layer 2 after flattening the bottom of the groove;

s2: a first medium coarse sand layer 3 is laid above the crushed stone layer 2, and a water filter screen clapboard 4 is arranged on the first medium coarse sand layer 3;

s3: filling a second medium coarse sand layer in the water filter screen partition plate 4 for tamping for 3 times to achieve the compaction degree of 90%, wherein the thickness of the second medium coarse sand layer 5 is at least 50mm greater than that of the water filter screen partition plate 4;

s4: placing the arc-shaped supporting block on the second medium coarse sand layer 5, and then placing the pipeline 1 in the arc-shaped supporting block;

s5; the pipeline 1 is wrapped with geotextile 7, and the outer wall of the pipeline 1 is connected with an annular steel frame for fixing the geotextile 7;

s6: carrying out a water-closing experiment;

s7: after the water closing test is successful, welding inclined strut steel plates 8 on two sides of the arc-shaped supporting block;

s8: symmetrically pouring first foam concrete on two sides of the pipeline 1 to the position of at least 100-150mm away from the top of the pipeline 1;

s9: coating a waterproof material on the first foam concrete, placing a transverse steel plate 9 on the waterproof material, and pouring second foam concrete on the transverse steel plate 9 to a position which is 650mm-800mm above the top of the pipeline 1;

s10: performing subsequent surface construction above the second foam concrete;

s11: and filling ceramsite concrete above the second foam concrete.

The specific application of the invention is as follows:

digging a groove according to the size of a pipeline 1, paving a gravel layer 2 after leveling the bottom of the groove, paving a first middle coarse sand layer 3 above the gravel layer 2, tamping, placing a water strainer partition plate 4 on the first middle coarse sand layer 3, filling a second middle coarse sand layer in the water strainer partition plate 4, tamping for 3 times to achieve 90% of compaction degree, wherein the thickness of the second middle coarse sand layer 5 is at least 50mm greater than that of the water strainer partition plate 4, so that a relatively flat plane is formed on the water strainer partition plate 4, placing the pipeline 1 on the second middle coarse sand layer 5, greatly reducing the inclined angle, playing an auxiliary effect on the fixed pipeline 1, placing an arc-shaped support block on the second middle coarse sand layer 5, then placing the pipeline 1 in the arc-shaped support block, wrapping a geotextile 7 on the pipeline 1, connecting an annular steel frame for fixing the geotextile 7 on the outer wall of the pipeline 1, and performing a water closing test, if the test is successful, welding the inclined strut steel plates 8 on two sides of the arc-shaped supporting block, symmetrically pouring first foam concrete on two sides of the pipeline 1 to the position of at least 100-150mm away from the top of the pipeline 1, wherein the end parts of the inclined strut steel plates 8 are still higher than the first foam concrete, coating a polymer waterproof material after the first foam concrete is cured, welding the inclined strut steel plates 8 and the transverse steel plate 9, pouring second foam concrete on the transverse steel plate 9 after welding, performing subsequent surface layer construction after the second foam concrete is cured, filling ceramsite concrete above the second foam concrete after the construction is finished, and finishing the construction.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.