WO2021088279A1

WO2021088279A1 - Underground pipeline having two-in-one support pile and pipeline wall and construction method

Info

Publication number: WO2021088279A1
Application number: PCT/CN2020/077899
Authority: WO
Inventors: 战福军
Original assignee: 南京联众工程技术有限公司
Priority date: 2019-11-08
Filing date: 2020-03-05
Publication date: 2021-05-14

Abstract

Disclosed is an underground pipeline having a two-in-one support pile and pipeline wall, comprising pipe joints which are composed of a top plate, a bottom plate and two side plates; adjacent pipe joints are spliced in the axial direction to form pipe racks; and lower ends of the two side plates extend downward and insert into a soil foundation, and simultaneously serve as a support pile and a pipeline wall. In the present invention, a traditional support structure is replaced with a steel plate structure, which not only has a supporting effect but also serves as a pipe rack side wall, thus greatly reducing fabrication costs, significantly reducing the construction volume, and shortening the construction period.

Description

Underground pipeline with supporting pile and pipeline wall combined into one and construction method

Technical field

The invention relates to an underground pipeline and a construction method, in particular to an underground pipeline in which a supporting pile and a pipeline wall are combined into one and a construction method.

Background technique

The current underground large-diameter pipe gallery, especially the rectangular pipe gallery, are mostly reinforced concrete structures. Generally, the foundation pit is excavated first. The foundation pit has a pile-supported foundation pit and a slope-excavated foundation pit without pile support. After the construction of the foundation pit is completed, the construction of the pipe gallery begins in the foundation pit, supporting the formwork, tying steel bars, pouring concrete, and so on. After the concrete strength reaches the standard, carry out the earth backfilling on both sides of the pipe gallery and the earth backfilling on the top of the pipe. Most of the installation methods of underground pipe gallery have disadvantages such as longer construction period, higher construction cost, and greater impact on surrounding structures.

Summary of the invention

Purpose of the invention: The present invention aims to provide an underground pipeline and a construction method that is convenient for construction, short construction period, and high-strength supporting piles and pipeline walls are combined into one.

Technical solution: An underground pipeline in which a supporting pile and a pipeline wall are combined into one, comprising a pipe section composed of a top plate, a bottom plate and two side plates. The adjacent pipe sections are spliced in the axial direction to form a pipe gallery. The lower end of the slab extends downward and is inserted into the soil foundation, and at the same time acts as a supporting pile and a pipe wall. The top plate, side plate and bottom plate are steel plates.

The top plate, side plate and bottom plate are flat steel plates or corrugated steel plates.

The adjacent side plates are connected in a sealed manner by flanges.

The two sides of the bottom plate and the top plate are respectively connected with flange pieces, and the flange pieces are respectively perpendicular to the bottom plate and the top plate; the bottom plate and the top plate are respectively connected to the side plates through the flange pieces.

When the side plate is a corrugated steel plate, the flange piece is corrugated, and the corrugated arc of the flange is the same as the corrugated arc of the corrugated steel plate column.

The side plate is a combined steel plate, and an upper side plate and a lower side plate are arranged in the vertical direction, and the upper and lower side plates are connected in a detachable connection manner. Preferably, a splint and a bolt are used for connection.

The bottom plate and/or the top plate are arched outwards.

The upper part of the top plate is provided with a backfill layer.

The lower part of the bottom plate is provided with a concrete layer.

An underground pipeline construction method in which a supporting pile and a pipeline wall are combined into one according to the present invention is characterized in that it comprises the following steps:

A. According to the design width of the pipe gallery, drive at least two rows of side panels into the target plot in parallel;

B. Excavate the soil foundation between each row of steel plates to the design depth of the pipe gallery, seal and connect the adjacent side plates (2), and install transverse bracing between the parallel steel plates;

C. Set a bottom plate at the bottom of the foundation pit, and seal the bottom plate with the side plate;

D. Fill the space between the bottom of the foundation pit and the floor with concrete;

E. Set a top plate on the upper part of each side plate, the installation height of the top plate is equal to the design height of the pipe gallery, and the top plate and the side plate are connected in a sealed manner;

F. Fill the upper part of the pipe gallery with backfill material to be flush with the ground.

The connection mode of adjacent side plates in the step B is flange connection.

The side plate is a combined steel plate, and an upper side plate and a lower side plate are arranged in the vertical direction, and the upper and lower side plates are externally connected by a detachable connection. Preferably, a splint and a bolt are used for connection.

In step E, the top plate is connected to the lower side plate; after step E is implemented, step F1 is implemented: remove the bolts on the splint, and pull out the upper side plate.

Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

(1) The utility model extends the side panels downwards and inserts them into the soil foundation to replace the traditional supporting structure. It not only plays a supporting role, but also serves as the side wall of the pipe gallery, which greatly saves the cost, greatly reduces the amount of construction, and makes the construction The construction period is shortened.

(2) The bottom plate and top plate of the utility model are steel plates. Compared with the traditional concrete pipe gallery or the pipe gallery where the side plate is steel plate and the bottom plate is a concrete structure, the connection is more convenient, easier to seal, and the seal is stronger; the construction work surface is small , Reducing the impact on surrounding foundations and structures, and the construction process is more environmentally friendly.

(3) The pipe gallery of the utility model is light in weight and convenient to transport, and each part of the structure can be transported over a long distance. Adopting this assembled structure facilitates standardized production.

Description of the drawings

Figure 1 is a schematic diagram of the process of step A of the present invention;

Figure 2 is a schematic diagram of the process of step B of the present invention;

Figure 3 is a schematic diagram of the process of step C of the present invention;

Figure 4 is a schematic diagram of the structure of the present invention;

Figure 5 is a schematic diagram of the combined steel plate structure of the present invention.

Detailed ways

The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings.

After studying different support methods, the inventor found that if it is a steel plate column support, the steel plate column must be pulled out, and if it is a pile that cannot be pulled out, the pile body will remain in the foundation. The above-mentioned concrete pipe gallery has a long construction period, and there are many environmental protection problems such as dust and noise on the construction site, which have a greater impact on the traffic around the construction site, and there is a large demand for materials such as sand and gravel. In addition, due to environmental issues, the price of concrete is getting more and more expensive, and the cost of pipe gallery structures is getting higher and higher.

If the foundation pit is a slope excavation foundation pit without pile support, in terms of construction, the slope foundation pit has a large demand for the working surface of the site, and the amount of excavation and backfilling is large. If it is a bored pile or steel plate supporting foundation pit, The cost is higher, and the supporting structure has a great impact on the surrounding foundation and surrounding structures. In addition, the construction period is long and the personnel cost is relatively high.

As shown in Figure 1, two rows of parallel side plates 2 are driven into the target plot 1 with a pile driver. The depth of the two rows of side plates is greater than the height of the pipe gallery, and the distance between the two rows of parallel side plates is equal to the design width of the pipe gallery . The two rows of steel plates are composed of several steel plate unit pieces, and the sides of the steel plate are provided with flange faces and flange holes.

Excavate the soil foundation between the two rows of steel plates, and when the bottom 4 of the soil foundation pit reaches a certain depth, cross braces 3 should be arranged between the two rows of side plates, as shown in Figure 2. During the excavation process or after the excavation is completed, use the flange faces and flange holes on the adjacent side plates to seal the adjacent side plates with bolts.

The side plate can be a straight steel plate or a corrugated steel plate to improve the strength of the structure and the ability to resist lateral earth pressure.

After the foundation pit reaches the required depth of the pipe gallery, a steel structure bottom plate 5 of the pipe gallery is set at the bottom of the foundation pit, flange plates 6 are welded on both sides of the bottom plate 5, and the flange plates are welded perpendicularly to the steel plate. The flange sheet 6 is provided with flange holes, and the side plates are provided with reserved holes corresponding to the flange holes. The bottom plate 5 is connected with the corrugated steel plate through bolts 7, as shown in FIG. 3. The connecting surface between the flange sheet 6 and the side plate 2 can be provided with a rubber gasket to increase the sealing performance of the pipe gallery. For the above-mentioned connecting bolts, one-way construction bolts can be used. If ordinary bolts are used, nuts need to be welded to the holes on the back of the side plates in advance.

After installing multiple bottom plates, pipes are used to fill the gap between the bottom plate 5 and the base with concrete 12, which is foamed concrete.

A top plate 8 is provided on the upper part of the side plate 2. The top plate is connected in the same way as the bottom plate, and flange pieces 8 are welded on both sides of the top plate, and the top plate 8 is connected to the side plate 2 with bolts 10. The connecting surface between the flange sheet 8 and the side plate 2 can be provided with a rubber gasket to increase the sealing performance of the pipe gallery. The distance between the top plate and the bottom plate is equal to the design height of the pipe gallery.

The top plate 8 and the bottom plate 5 may be flat steel plates or corrugated steel plates. The top plate 8 and the bottom plate 5 can also be arch plates that arch outward. When the top plate 8 and the bottom plate 5 are connected in the axial direction, a flange connection is adopted, and a rubber sealing gasket is arranged between the flanges to increase the sealing performance of the pipe gallery.

After installing the roof, backfill the upper foundation pit of the pipe gallery roof to the ground to complete the required buried pipe gallery project. The backfill layer 11 can be excavated soil or other backfill materials.

In specific implementation, reinforcing ribs can be arranged between the flange piece and the top or bottom plate to increase the strength of the plate and prevent the plate from being deformed during the connection process.

The steel plate can also be a combined side plate 13, which is divided into two sections in the height direction, namely, an upper side plate 15 and a lower side plate 14, as shown in FIG. 5. The upper side plate 15 and the lower side plate 14 are externally provided with a clamping plate 16 and bolts 17 to connect and fix the combined side plate 13. In the above-mentioned combined corrugated side plate 13, during the construction process, the lower side plate 14 is connected with the top plate and the bottom plate to form pipe joints. After the top plate and steel plate are connected and installed, remove the bolts on the splint, backfill the upper part of the top plate to the ground, and pull out the upper side plate 15. When the pre-buried depth of the pipe gallery is deep, the combined side plate 13 can be used. The removal of the upper side plate can prevent the waste of steel and increase the strength of the side plate when it is driven into the soil foundation.

The combined side plate 13 may be a corrugated steel plate, and the corresponding splint 16 has a corrugated shape, and the corrugated shape is consistent with the corrugated steel plate shape.

The utility model replaces the traditional supporting structure with a steel plate knot, which not only plays a supporting role but also acts as a side wall of a pipe gallery, greatly saves the cost, greatly reduces the amount of construction, and shortens the construction period. The bottom plate and the top plate of the utility model are made of steel plates. Compared with the traditional concrete pipe gallery or the pipe gallery where the side plate is a steel plate and the bottom plate is a concrete structure, the connection is more convenient, the seal is easier and the sealing performance is stronger. The construction work surface is small, which reduces the impact on surrounding foundations and structures, and the construction process is more environmentally friendly. The pipe gallery of the utility model has strong sealing performance, light weight and convenient transportation, and the structural parts of various parts can be transported in a long distance. Adopting this assembled structure facilitates standardized production.

Claims

An underground pipeline in which a supporting pile and a pipeline wall are combined into one, comprising a pipe section composed of a top plate (8), a bottom plate (6) and two side plates (2), and adjacent pipe sections are spliced along the axial direction to form a pipe Corridor, characterized in that the lower ends of the two side panels (2) extend downward and are inserted into the soil foundation, and at the same time serve as supporting piles and pipe walls; the top panel (8), the side panels (2) and the bottom panel (9) For steel plate.
The underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 1, wherein the side plate is a combined side plate (13), and an upper side plate (15) is provided in the vertical direction. ) And the lower section side plate (14), and the upper and lower section side plates are connected in a detachable connection mode; the top plate (8) is connected to the lower section side plate (14).
The underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 1, characterized in that the bottom plate (6) and/or the top plate (8) arch outwards.
The underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 1, wherein the top plate (8), the bottom plate (6) and the two side plates (2) are flat steel plates.
The underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 1, wherein the top plate (8), the bottom plate (6) and the two side plates (2) are corrugated steel plates.
The underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 1, wherein the two sides of the bottom plate (6) and the top plate (8) are respectively connected with flange pieces, and the flange The sheets are respectively perpendicular to the bottom plate and the top plate; the bottom plate (6) and the top plate (8) are respectively connected to the side plates (2) through flanges.
The underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 5 or 6, characterized in that the flange piece is corrugated, and the corrugated arc of the flange is the same as the corrugated arc of the corrugated steel plate column.
The underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 1, wherein the lower part of the bottom plate is provided with a concrete layer.
The underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 1, wherein the upper part of the top edge is provided with a backfill layer.
An underground pipeline construction method in which a supporting pile and a pipeline wall are combined into one is characterized in that it comprises the following steps:

A. According to the design width of the pipe gallery, drive the two rows of side panels (2) into the target plot (1) in parallel;

B. Excavate the soil foundation between each row of steel plates to the design depth of the pipe gallery, seal and connect the adjacent side plates (2), and set up cross braces between the parallel steel plates;

C. Set a bottom plate (5) at the bottom of the foundation pit, and seal the bottom plate and side plates (2);

D. Fill the space between the bottom of the foundation pit (4) and the bottom plate (5) with concrete (12);

E. Set a top plate (8) on the upper part of each side plate, the installation height of the top plate (8) is equal to the design height of the pipe gallery, and the top plate and the side plate are connected in a sealed manner;

F. Fill the upper part of the pipe gallery with backfill material (11) flush with the ground.
The method for constructing an underground pipeline in which the supporting pile and the pipeline wall are combined into one according to claim 10, wherein the side plate is a combined side plate (13), and an upper side plate is provided in the vertical direction. (15) and the lower section side plate (14), the outer side of the upper and lower section side plates are connected by detachable connection.
The underground pipeline construction method in which the supporting pile and the pipeline wall are combined into one according to claim 11, characterized in that, in step E, the top plate (8) is connected to the lower side plate (14); in the implementation step After E, perform step F1: dismantle the detachable connecting device, and pull out the upper side panel (15).