阅读说明：本技术 一种可调节式地下埋管支承系统及其施工与调节方法 (Adjustable underground pipe laying supporting system and construction and adjustment method thereof ) 是由 马军卫 吴方华 陈静静 于 2019-02-02 设计创作，主要内容包括：本发明公开了一种可调节式地下埋管支承系统及其施工与调节方法,涉及软土地基处理领域,所述系统包括：粉喷桩、土工布、褥垫层、下承板、上承板和埋管调节装置。施工时先用粉喷桩对埋管基础软基进行加固,然后在其上铺设土工布,土工布上铺设褥垫层,褥垫层碾压平整完成后,进行下承板、上承板的施工,上承板施工过程中敷设管道,管道敷设完成后,进行外套护管、沉降观测管以及管帽的施工,最后对埋管基坑进行回填施工。调节时将辅助升降杆安装到螺杆上,并反调螺杆的上升值,使上升值与沉降值相等,即完成了埋管的沉降调节。该装置及其施工与调节方法可使常见的埋管处易发生不均匀沉降的现象得到有效遏制,具有广阔的工程应用前景。(The invention discloses an adjustable underground pipe laying supporting system and a construction and adjustment method thereof, relating to the field of soft soil foundation treatment, wherein the system comprises: powder spraying pile, geotextile, mattress layer, lower bearing plate, upper bearing plate and pipe laying adjusting device. During construction, a powder-jet pile is firstly used for reinforcing a soft foundation of a pipe-burying foundation, then geotextile is laid on the powder-jet pile, a mattress layer is laid on the geotextile, after the mattress layer is rolled and leveled, construction of a lower bearing plate and an upper bearing plate is carried out, a pipeline is laid in the construction process of the upper bearing plate, after the pipeline is laid, construction of an outer sleeve protective pipe, a settlement observation pipe and a pipe cap is carried out, and finally backfilling construction is carried out on a pipe-burying foundation pit. And during adjustment, the auxiliary lifting rod is arranged on the screw rod, and the rising value of the screw rod is reversely adjusted to be equal to the settling value, so that the settling adjustment of the buried pipe is completed. The device and the construction and adjustment method thereof can effectively restrain the phenomenon that the common buried pipe is easy to have uneven settlement, and have wide engineering application prospect.)

1. An adjustable underground pipe laying supporting system is characterized by comprising a powder-jet pile (3), geotextile (4), a mattress layer (5), a lower bearing plate (6), an upper bearing plate (7) and a pipe laying adjusting device which are arranged in sequence from bottom to top;

the powder spraying pile (3) is vertically arranged in a soft foundation on the buried pipe foundation, and the upper end of the powder spraying pile (3) is flush with the surface of the soft foundation and is used for reinforcing the soft foundation;

the geotextile (4) is laid on the surface of the soft foundation;

the mattress layer (5) is laid on the geotextile (4);

the lower bearing plate (6) is arranged on the mattress layer (5), the upper bearing plate (7) is arranged on the lower bearing plate (6), and the upper bearing plate (7) and the lower bearing plate (6) are matched to form a hollow area;

the pipe burying adjusting device comprises a pipeline elevator (9) and an adjusting part;

the pipeline elevator (9) is arranged in the hollow area, and a buried pipe (13) is arranged in the pipeline elevator (9);

one end of the adjusting part is fixedly connected to the pipeline elevator (9) and used for lifting the pipeline elevator (9) and suspending the pipeline elevator in the hollow area, and the other end of the adjusting part is exposed above the upper bearing plate (7) and used for being connected with lifting equipment when the pipeline elevator needs to be lifted.

2. The adjustable underground pipe support system according to claim 1, wherein the adjustment part comprises a ball joint (10), a screw (11), an outer sheath (14) and a settlement observation tube (15);

the spherical hinge (10) is fixed on the upper surface of the pipeline elevator (9);

a plate body on the upper bearing plate (11) above the spherical hinge (10) is provided with a preformed hole which penetrates through the plate body in the vertical direction; an embedded nut (12) is fixed in the preformed hole;

the screw rod (11) axially vertically penetrates through the embedded nut, the lower end of the screw rod (11) is fixed on a ball pin of the ball hinge (10), and the upper end of the screw rod (11) is exposed above the upper bearing plate (7);

the settlement observation pipe (15) is sleeved outside the screw (11) above the upper end of the embedded nut (12).

3. An adjustable underground pipe laying support system according to any one of claims 1-2, characterised in that the lower deck (6) and the upper deck (7) are connected by a horizontal seam (8).

4. An adjustable underground support system according to claim 2, wherein the sedimentation sight tube (15) is anchored in the upper deck (7), and a cap (16) is mounted on top of the sedimentation sight tube (15).

5. The adjustable underground pipe support system according to claim 4, wherein the settlement observation tube (15) is externally provided with an outer casing (14), and the outer casing (14) is rested on the upper surface of the upper deck (7).

6. The adjustable underground pipe support system according to claim 1, wherein the bedding layer (5) is composed of one or more of graded crushed stones or grit or ceramic grains.

7. The adjustable underground pipe support system according to claim 1, wherein the pipe lower deck (6) and the upper deck (7) are cast in place or prefabricated from reinforced concrete.

8. The adjustable underground pipe laying supporting system according to any one of claims 1-2, wherein the lifting device is an auxiliary lifting rod, and the upper end of the screw rod (11) and the lower end of the auxiliary lifting rod are provided with inner and outer hexagonal heads which are matched with each other.

9. A construction method of an adjustable underground pipe laying supporting system is characterized by comprising the following steps:

firstly, after pipe burying position determination and ground paying off are finished, construction of powder spraying piles (3) is carried out on the axis and two side positions of the buried pipe, during construction, powder spraying is stopped after powder spraying is sprayed to the height of the pipe bottom of the section of a lower bearing plate (6) from the bottom of the arranged powder spraying pile (3), and excavation of a buried pipe foundation pit is carried out according to the designed section;

step two, after the foundation pit is excavated to the designed elevation, arranging drainage ditches (1) and drainage wells (2) on two sides of the inner bottom of the foundation pit, and performing dewatering construction inside the foundation pit;

thirdly, cutting off redundant pile heads of the powder spraying piles (3), laying geotextile (4) after a ground in a foundation pit is leveled, laying a mattress layer (5), carrying out structural construction on a lower bearing plate (6) after the mattress layer is rolled and leveled, then installing a pipeline elevator (9), a spherical hinge (10) and a pre-embedded nut (12) on a pipe body of an embedded pipe (13), and then carrying out structural construction on an upper bearing plate (7), wherein a sedimentation observation pipe (15) penetrates through the outer side of a screw rod (11) on the outer side of the spherical hinge (10) during construction and is anchored in concrete of the upper bearing plate (7);

and fourthly, after the construction and maintenance of the upper bearing plate (7) structure are completed, an outer protective sleeve (14) penetrates through the outer side of the settlement observation pipe (15) on the upper bearing plate, the drainage well (2) is sealed, the foundation pit is backfilled, and the buried pipe (13) is adjusted to the designed elevation by using an auxiliary lifting rod after the construction is completed.

10. An adjustment method of an adjustable underground pipe laying support system, characterized in that:

after the buried pipe (13) is settled, an auxiliary lifting rod is installed on the screw rod (11) by measuring the settlement value of the settlement observation pipe (15), and the rising value of the screw rod (11) is reversely adjusted to be equal to the settlement value, so that the settlement adjustment of the buried pipe (13) is completed.

Technical Field

The invention relates to the field of soft soil foundation treatment, in particular to an adjustable underground pipe laying supporting system and a construction and adjustment method thereof.

Background

When the building is built on a soft foundation, the underground water level is generally higher, and the bearing capacity of the foundation is mostly lower, so the foundation of the building is generally required to be treated by soft foundation, and the bearing capacity of the foundation soil can meet the bearing capacity requirement of the building. The post-construction settlement of the building treated by the soft foundation is generally smaller. Along with the increasingly perfect functions of modern buildings, various buried pipes in the buildings are more and more, and the buried pipes can be divided into the following parts according to the functions: the number of various types of buried pipes such as electric power, communication, gas, water supply, heating power, water drainage and the like is increasing.

In the conventional method, a typical method of a pipe-embedded foundation is shown in fig. 1-2, when a building is built on a soft foundation, in order to meet the bearing capacity requirement of the foundation, foundation treatment is generally performed on the soft foundation below the building, so that the bearing capacity of the treated foundation meets the design requirement. When the construction of the building main body structure is completed and the building pipeline laying stage is started, a 'soil replacement cushion method' is generally adopted for reinforcing a soft foundation below the buried pipe 13 on the outer side of the building (such as a pipe burying area above an excavation line in the attached drawing 2). Specifically, the original soil below the buried pipe 13 is dug and removed, then the soil is changed into a soil changing cushion layer 20 with lower compression rate, and the buried pipe 13 is laid on the soil changing cushion layer, so that the construction of the buried pipe foundation is simple, the efficiency is higher, but the obvious disadvantages exist: the settlement of the treated foundation below the main structure of the building is relatively small, so that the settlement of the buried pipe 13 (shown in the attached figure 1) in the main structure of the building is relatively small; the buried pipe 13 in the "buried pipe area" outside the building main structure has a smaller bearing capacity of the foundation where the pipeline is located, so the settlement is generally larger, the buried pipe 13 is often unevenly settled due to consolidation, settlement and the like of the upper layer soil covering of the buried pipe section, and when the settlement of the buried pipe 13 is larger, the buried pipe 13 is often broken, leaked and the like.

After the buried pipe 13 is broken or leaked, it is generally difficult to maintain the buried pipe, and during maintenance, large excavation needs to be performed at the damaged position of the buried pipe 13, so that the maintenance period is long and the cost is high. Meanwhile, the work and life of users in the building are inconvenient due to pipeline shutdown and the like, and the economic loss caused by the inconvenience is large.

In order to overcome the technical problems that when an underground pipe is laid on a soft soil foundation and the underground water level is high, the pipe burying position outside a building is often solidified and settled due to the upper layer of covering soil, the pipe burying generates uneven settlement, when the pipe burying is a rigid pipeline, the pipe burying is often broken and leaked due to uneven settlement, the maintenance period of the pipe burying is long, and the maintenance cost is high, the technical problems are urgently needed to be solved through measures such as technical improvement.

Disclosure of Invention

To solve the technical problem posed, the present invention proposes, for this purpose, an adjustable underground pipe support system comprising: the powder spraying pile, the geotextile, the mattress layer, the lower bearing plate, the upper bearing plate and the pipe burying adjusting device are arranged from bottom to top in sequence.

The powder spraying pile is vertically arranged in a soft foundation on the buried pipe foundation, and the upper end of the powder spraying pile is flush with the surface of the soft foundation and is used for reinforcing the soft foundation; geotextile is laid on the surface of the soft base; the mattress layer is laid on the geotextile; the lower bearing plate is arranged on the mattress pad layer, the upper bearing plate is arranged on the lower bearing plate, and the upper bearing plate and the lower bearing plate are matched to form a hollow area.

The pipe laying adjusting device comprises a pipeline elevator and an adjusting part.

The pipeline elevator is arranged in the hollow area, and the interior of the pipeline elevator is used for laying buried pipes.

One end of the adjusting part is fixedly connected to the pipeline elevator and used for lifting and suspending the pipeline elevator in the hollow area, and the other end of the adjusting part is exposed above the upper bearing plate and used for being connected with lifting equipment when needing to be lifted.

The adjusting part comprises a spherical hinge, a screw rod, an outer sleeve protective pipe and a settlement observation pipe.

The spherical hinge is fixed on the upper surface of the pipeline elevator.

A plate body on the upper bearing plate above the spherical hinge is provided with a preformed hole which penetrates through the upper bearing plate along the vertical direction; and a pre-embedded nut is fixed in the preformed hole.

The screw rod axially vertically penetrates through the embedded nut, the lower end of the screw rod is fixed on the ball pin of the ball hinge, and the upper end of the screw rod is exposed above the upper bearing plate.

The settlement observation pipe is sleeved outside the screw rod above the upper end of the embedded nut.

The lower deck is connected with the upper deck by a horizontal seam.

The settlement observation pipe is anchored in the upper bearing plate, and a pipe cap is installed on the upper portion of the settlement observation pipe.

An outer sleeve protection pipe is arranged outside the settlement observation pipe and is placed on the upper surface of the upper bearing plate.

The mattress layer is composed of one or more of graded broken stones, coarse sand or ceramsite.

The pipe lower bearing plate and the pipe upper bearing plate are cast in place or prefabricated by reinforced concrete.

The lifting device is an auxiliary lifting rod, and the upper end of the screw rod and the lower end of the auxiliary lifting rod are provided with an inner hexagon and an outer hexagon which are matched with each other.

Preferably, the mattress layer is composed of graded broken stones, and graded sand stones or other materials can be selected to replace the graded broken stones according to the actual situation of the construction site.

Preferably, the pipe lower bearing plate and the pipe upper bearing plate are made of precast concrete to accelerate construction progress. And a cast-in-place concrete form can be selected according to the actual situation of a construction site.

A construction method of an adjustable underground pipe laying supporting system specifically comprises the following steps:

1) after the position of the buried pipe is determined and the ground is paid off, powder spraying pile construction is firstly carried out on the axis of the buried pipe and the positions of two sides of the buried pipe, during construction, powder spraying is stopped after the powder spraying is sprayed to the pipe bottom height of the section of the lower bearing plate from the bottom of the arranged powder spraying pile, and the buried pipe foundation pit is excavated according to the designed section;

2) after the foundation pit is excavated to the designed elevation, arranging drainage ditches and drainage wells at two sides of the inner bottom of the foundation pit, and performing dewatering construction inside the foundation pit;

3) cutting off the redundant pile head of the powder spraying pile, paving geotextile after the ground in the foundation pit is leveled, paving a mattress layer, carrying out lower bearing plate structure construction after the mattress layer is rolled and leveled, then installing a pipeline elevator, a spherical hinge and a pre-embedded nut on the pipe body of the buried pipe, and then carrying out upper bearing plate structure construction, wherein during construction, the sedimentation observation pipe is firstly arranged on the outer side of a screw rod on the outer side of the spherical hinge in a penetrating way and anchored in the concrete of the upper bearing plate;

4) after the construction and maintenance of the upper bearing plate structure are completed, an outer protective sleeve penetrates through the outer side of the settlement observation pipe on the upper bearing plate structure, the well is sealed for the drainage well, the foundation pit is backfilled, and the buried pipe is adjusted to the designed elevation by using the auxiliary lifting rod after the construction is completed.

Preferably, one end of the auxiliary lifting rod in the above steps is an inner hexagon, and the other end is an outer hexagon; the inner hexagon can be embedded on the outer hexagon of the screw rod.

An adjusting method of an adjustable underground pipe laying supporting system is realized by the following steps:

and after the buried pipe is settled, the auxiliary lifting rod is arranged on the screw rod by measuring the settlement value of the settlement observation pipe, and the ascending value of the screw rod is reversely adjusted to enable the ascending value to be equal to the settlement value, so that the settlement adjustment of the buried pipe is completed.

Preferably, in the adjusting method, one end of the auxiliary lifting rod is an inner hexagon, and the other end of the auxiliary lifting rod is an outer hexagon; the inner hexagon can be embedded on the outer hexagon of the screw rod.

The technical principle is that firstly, a powder-spraying pile is adopted to integrally reinforce a soft foundation of a buried pipe foundation, then, geotextile, a mattress layer, a bearing plate and an upper bearing plate are sequentially arranged on the powder-spraying pile, and the buried pipe is connected with the upper bearing plate through a pipeline elevator, a spherical hinge and a screw rod. On one hand, the soft foundation under the buried pipe is reinforced by adopting the powder-jet piles, so that the bearing capacity of the foundation is greatly improved, and the uneven settlement of the buried pipe is greatly reduced; on the other hand, the buried pipe is suspended on the upper bearing plate, so that the gravity of the buried pipe and the gravity of the external earthing soil are indirectly transmitted to the lower foundation, the buried pipe does not bear the gravity of the upper earthing soil, and the uneven settlement of the buried pipe is further reduced. When the lower bearing plate and the upper bearing plate are settled due to consolidation and hardening of upper-layer covering soil, the buried pipe is not twisted and damaged and only vertical relative displacement occurs through combined action of the pipeline elevator, the spherical hinge and the screw rod, and finally the buried pipe is leveled in time through the auxiliary lifting rod, so that secondary adjustment of the elevation of the buried pipe is realized, and the buried pipe is always in a good running state. By the combined application of the methods, the post-construction settlement of the buried pipe is greatly reduced or basically eliminated.

The adjustable underground pipe laying supporting system has the beneficial effects that the phenomenon that the common pipe laying position is easy to have uneven settlement is effectively restrained, the post-construction settlement of the pipe laying position is greatly reduced, the phenomena of leakage, breakage and the like of the pipe laying position caused by the frequent uneven settlement of the pipe laying position are effectively reduced, and further, the operation and maintenance cost of the pipe laying position in the operation period is greatly reduced. Furthermore, after the buried pipe is unevenly settled, the buried pipe can be timely adjusted through the auxiliary lifting rod, so that the further development of uneven settlement of the buried pipe is avoided, the purpose of adjusting the height of the buried pipe without large excavation is realized, and the phenomena of leakage, breakage and the like of the buried pipe due to uneven settlement are effectively avoided. The device and the construction and adjustment method thereof have wide engineering application prospect.

Drawings

FIG. 1 is a schematic diagram of a method for treating a pipe foundation in a conventional manner according to the prior art;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a view of a large scale of FIG. 3;

fig. 5 is a schematic structural view of the auxiliary lifting rod.

Reference numerals: 1-drainage ditch, 2-drainage well, 3-powder-sprayed pile, 4-geotextile, 5-mattress layer, 6-lower bearing plate, 7-upper bearing plate, 8-horizontal joint, 9-pipeline elevator, 10-spherical hinge, 11-screw, 12-embedded nut, 13-embedded pipe, 14-outer protective pipe, 15-settlement observation pipe, 16-pipe cap, 17-screw outer hexagon, 18-inner hexagon, 19-outer hexagon and 20-soil replacement cushion layer.

Detailed Description

The technical scheme of the invention is clearly and completely described below with reference to the accompanying drawings 3-5.