CN115305917A

CN115305917A - Post-grouting steel strip corrugated pipe

Info

Publication number: CN115305917A
Application number: CN202211025064.8A
Authority: CN
Inventors: 赵贵宾; 曾德泽; 王艺博; 李金�; 陈凯远
Original assignee: CSCEC Strait Construction and Development Co Ltd
Current assignee: CSCEC Strait Construction and Development Co Ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2022-11-08

Abstract

The invention relates to a post-grouting steel strip corrugated pipe, and belongs to the technical field of building construction. The grouting device comprises a pile bottom corrugated pipe, a grouting pipe and at least one connecting corrugated pipe, wherein the bottom end of the connecting corrugated pipe is inserted into the top end of the pile bottom corrugated pipe and is in threaded connection with the pile bottom corrugated pipe, the top end of the pile bottom corrugated pipe is open and the bottom end of the pile bottom corrugated pipe is closed, a water inlet and a grouting opening are formed in the bottom end of the pile bottom corrugated pipe, a one-way water inlet cover is rotatably connected onto the water inlet, and the bottom end of the grouting pipe penetrates through the connecting corrugated pipe and the pile bottom corrugated pipe to be inserted into the grouting opening and is in threaded connection with the grouting opening; the invention solves the problems of long construction period, poor connection stability with bedrock and the like of the pile foundation in the prior art.

Description

Post-grouting steel strip corrugated pipe

Technical Field

The invention relates to a post-grouting steel strip corrugated pipe, and belongs to the technical field of building construction.

Background

The foundation and foundation engineering construction plays a vital role in the building engineering, the pile foundation construction is a very common one applied to the foundation and foundation engineering, the construction method of the pile foundation is generally divided into two categories, namely precast pile and cast-in-place pile, and the current common pile foundation construction comprises rotary-digging cast-in-place pile, high-pressure rotary-spraying pile, static pressure pile, prestressed pipe pile and the like.

The prior art application number is: CN201210410447.7 patent document discloses a mechanical hole forming method under karst landform, which includes lofting and positioning; excavating a slurry pool; embedding a pile casing; positioning a drilling machine and manufacturing slurry; punching by impact; slag pumping and slurry supplementing; checking sediment; cleaning holes; inspecting the hole; placing a reinforcement cage; a lower conduit; pouring underwater concrete; wherein, a self-made hole cleaning device is used for cleaning holes; and when the hole is formed by impact, when the depth of the karst cave encountered in the construction process is more than or equal to 3 meters, arranging a steel protective barrel protecting wall.

For karst cave landform foundation treatment, dig bored concrete pile construction soon and need dig earlier to the degree of depth that the drawing design required after, fill the karst cave with C15 concrete, reuse digger drilling pouring pile body concrete after concrete strength reaches corresponding requirement, often find after drilling that the karst cave is not handled well then use C15 concrete again to fill and pour, there are multiple drawbacks in doing so: 1. the engineering cost is high, 2, the process interval is long, 3, the influence on the construction period is large, and 4, the damage to the underground water environment is serious.

The pile foundation in the prior art has the problems of long construction period, poor connection stability with bedrock and the like, so the invention provides a post-grouting steel strip corrugated pipe for solving the problems.

Disclosure of Invention

In order to overcome the defects of long construction period, poor connection stability with bedrock and the like of the existing pile foundation, the invention designs the post-grouting steel strip corrugated pipe.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a back slip casting steel band bellows, includes bellows, slip casting pipe and at least one connection bellows at the bottom of the stake, the connection bellows bottom insert at the bottom of the stake bellows top and with bellows threaded connection at the bottom of the stake, open and the bottom is airtight at the bottom of the stake bellows top, open at the bottom of the stake bellows bottom has water inlet and slip casting mouth, it is connected with one-way lid that intakes to rotate on the water inlet, slip casting bottom of the tubes passes and connects bellows and stake bottom bellows insert slip casting mouth and with slip casting mouth threaded connection.

The pile bottom corrugated pipe top is equipped with the enlarged footing, connecting the corrugated pipe top and being equipped with the connector, the bottom is equipped with down the connector, connector and last connector are looks adaptation down, the lower connector of the connecting corrugated pipe that is located the below inserts the enlarged footing and with enlarged footing threaded connection.

One-way water inlet cover sets up in slip casting mouth top, the bottom is provided with two engaging lugs in the bellows at the bottom of the pile, be provided with T shape pole between the engaging lug, T shape pole both sides rotate with the engaging lug respectively and are connected, T shape pole one end and one-way water inlet cover fixed connection.

A cross rod is fixedly arranged in the water inlet, and the cross rod is connected with the one-way water inlet cover through a string.

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

according to the invention, through the arrangement of the pile bottom corrugated pipe, the connecting corrugated pipe and the grouting pipe, the pile bottom corrugated pipe and the connecting corrugated pipe can be used for forming the pile body at one time, so that karst cave filling of karst landform is avoided, and the problems of long construction period caused by filling karst caves and poor filling are avoided; the grouting pipe can perform high-pressure grouting after the grouting is integrally completed in the corrugated pipe, so that the connection stability of the pile bottom corrugated pipe and the bedrock is enhanced, the contact area of the corrugated pipe and the bedrock can be increased due to the corrugated characteristic of the corrugated pipe after the high-pressure grouting, the bottom end of the pile body, which cannot be completely stressed, is enabled to be further increased, and the connection stability of the pile body and the bedrock is further increased;

due to the arrangement of the pile bottom corrugated pipe and the connecting corrugated pipe in the construction of the saline-alkali soil, corrosive substances in the saline-alkali soil can be isolated, and the pile body is prevented from being corroded by the corrosive substances;

according to the invention, through the arrangement of the pile bottom corrugated pipe and the connecting corrugated pipe, the problem of hole collapse is avoided, meanwhile, the problem of hole bottom sediment caused by the falling of the hole wall is also avoided, and the bearing capacity of the pile foundation is improved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a front view of the connecting bellows of the present invention;

FIG. 3 is a partial view of the inner side of the lower end of the pile bottom bellows according to the present invention;

fig. 4 is a partial structural view of the outer side of the lower end of the pile bottom bellows according to the present invention.

Wherein the reference numbers are: 10. a pile bottom bellows; 11. a water inlet; 12. a grouting port; 111. a cross bar; 13. a one-way water inlet cover; 131. a T-shaped rod; 132. connecting lugs; 14. a head is expanded; 20. connecting a corrugated pipe; 21. a lower connector; 22. an upper connector; 30. and (4) grouting pipes.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1-4, the post-grouting steel strip corrugated pipe of this embodiment includes a pile bottom corrugated pipe 10, a grouting pipe 30 and at least one connection corrugated pipe 20, the pile bottom corrugated pipe 10 and the connection corrugated pipe 20 are made of U-shaped steel strip composite PE, reinforced polyethylene (HDPE) or PVC, etc., so that the pipe has greatly improved hoop stiffness without increasing cost, and has higher strength than a winding pipe and a krat pipe under the same weight, the steel strip surface is specially pretreated to enhance corrosion resistance of steel and adhesion of steel and plastic, and improve peel strength, the bottom end of the connection corrugated pipe 20 is inserted into the top end of the pile bottom corrugated pipe 10 and is fixedly connected with the pile bottom corrugated pipe 10, the top end of the pile bottom corrugated pipe 10 is open and the bottom end is closed, the bottom end of the pile bottom corrugated pipe 10 is provided with a water inlet 11 and a grouting port 12, the water inlet 11 is rotatably connected with a one-way water inlet cover 13, and the bottom end of the grouting pipe 30 passes through the connection corrugated pipe 20 and the pile bottom corrugated pipe 10 and is inserted into the grouting port 12 and is in threaded connection with the grouting port 12.

Further, an enlarged head 14 is arranged at the top end of the pile bottom corrugated pipe 10, threads are arranged on the inner wall of the enlarged head 14, an upper connector 22 is arranged at the top end of the connecting corrugated pipe 20, a lower connector 21 is arranged at the bottom end of the connecting corrugated pipe, threads are arranged on the inner wall of the upper connector 22, threads are arranged on the outer wall of the lower connector 21, the lower connector 21 and the upper connector 22 are matched, and when the number of the connecting corrugated pipes 20 is more than two, the lower connector 21 of the connecting corrugated pipe 20 positioned at the upper part is inserted into the upper connector 22 of the connecting corrugated pipe 20 positioned at the lower part and is in threaded connection with the upper connector 22; the lower connection head 21 of the lowermost connection bellows 20 is inserted into the enlarged head 14 and is screwed to the enlarged head 14.

Furthermore, one-way water inlet cover 13 is arranged above grouting opening 12, two connecting lugs 132 are arranged at the bottom of pile bottom corrugated pipe 10, T-shaped rods 131 are arranged between connecting lugs 132, two sides of T-shaped rods 131 are respectively connected with connecting lugs 132 in a rotating mode, one end of each T-shaped rod 131 is fixedly connected with one-way water inlet cover 13, water can flow into the corrugated pipe when water exists in the drilled hole due to the arrangement of one-way water inlet cover 13, loss of concrete can be avoided, and the problem that the drilled hole cannot be placed into pile bottom corrugated pipe 10 due to buoyancy is solved.

Furthermore, a cross rod 111 is fixedly arranged in the water inlet 11, the cross rod 111 is connected with the one-way water inlet cover 13 through a string, and the string is used for preventing the one-way water inlet cover 13 from being closed automatically due to too large opening degree.

During construction, firstly, performing fixed-point setting and paying-off by using a total station according to corresponding coordinates of piles in a design drawing, finding and marking corresponding pile positions in a construction field, drilling holes by using a rotary drilling machine after the pile positions are determined, drilling holes to 50cm below complete bedrock during drilling, then placing a pile casing, continuing drilling after the placement of the pile casing is finished, and drilling till the corresponding hole bottom elevation is reached and rechecking; the pile bottom corrugated pipe 10, the grouting pipe 30 and the connecting corrugated pipe 20 are connected and placed in a drill hole, after the corrugated pipe is placed, a reinforcement cage can be placed in the corrugated pipe, the position of the reinforcement cage is corrected, concrete is poured into the closed corrugated pipe, finally high-pressure grouting is carried out, and high-pressure grouting is carried out on the outside of the corrugated pipe through the grouting pipe 30 so as to enhance the connection reliability between the corrugated pipe and a geological structure.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the terms in the invention is understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A post-grouting steel strip corrugated pipe is characterized in that: including bellows (10), slip casting pipe (30) and at least one connection bellows (20) at the bottom of the stake, connection bellows (20) bottom insert at the bottom of the stake bellows (10) top and with bellows (10) fixed connection at the bottom of the stake, open and the bottom is airtight at bellows (10) top at the bottom of the stake, open bellows (10) bottom at the bottom of the stake has water inlet (11) and slip casting mouth (12), it is connected with one-way water cover (13) of intaking to rotate on water inlet (11), slip casting pipe (30) bottom is passed connection bellows (20) and at the bottom of the stake bellows (10) and is inserted slip casting mouth (12) and with slip casting mouth (12) threaded connection.

2. The post-grouting steel strip corrugated pipe as claimed in claim 1, wherein: pile bottom bellows (10) top is equipped with enlarged footing (14), connecting bellows (20) top is equipped with connector (22), and the bottom is equipped with down connector (21), connector (21) and last connector (22) are the looks adaptation down, be located the lower connector (21) of connecting bellows (20) of below insert enlarged footing (14) and with enlarged footing (14) threaded connection.

3. The post-grouting steel strip corrugated pipe of claim 1, wherein: one-way lid (13) that intakes sets up in slip casting mouth (12) top, the bottom is provided with two engaging lugs (132) in stake end bellows (10), be provided with T shape pole (131) between engaging lug (132), T shape pole (131) both sides rotate with engaging lug (132) respectively and are connected, T shape pole (131) one end and one-way lid (13) fixed connection that intakes.

4. A post-grouting steel strip corrugated pipe as claimed in claim 3, characterized in that: a cross rod (111) is fixedly arranged in the water inlet (11), and the cross rod (111) is connected with the unidirectional water inlet cover (13) through a string.