CN210003890U

CN210003890U - hard bag type rear grouting valve for cast-in-place pile

Info

Publication number: CN210003890U
Application number: CN201920759185.2U
Authority: CN
Inventors: 周广泉; 沈缤; 孙永华; 丁德利
Original assignee: SHANDONG MECHANIZATION CONSTRUCTION CO Ltd
Current assignee: SHANDONG MECHANIZATION CONSTRUCTION CO Ltd
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-01-31
Anticipated expiration: 2029-05-24

Abstract

In order to solve the problem that current back slip casting valve structure is complicated, easy jam, the utility model provides a slip casting valve behind kind safe and reliable, simple structure, suitable industrialization mass production, the lower hard bag formula that is used for bored concrete pile of cost mainly include the valve body, its characterized in that, the plastic valve body for body shaping of moulding plastics, plastic valve body surface does not set up out the grout mouth, lower part fixedly connected with bottom end cover, upper end opening and the inside fixedly connected with internal nut in the upper end, through the grout of injecting constant pressure into the valve body, the valve body bursts to carry out the slip casting, not only avoided the problem of valve body jam, simple structure, low cost moreover.

Description

hard bag type rear grouting valve for cast-in-place pile

Technical Field

The utility model relates to a building technical field, in particular to back slip casting valves for drilling bored concrete pile.

Background

The post-grouting valve for bored piles disclosed in the market at present is manufactured by a steel pipe like , as shown in fig. 1, a plurality of grout outlets 5 are distributed on a valve pipe body, and a plurality of layers of (rubber and plastic) sheaths are wrapped outside the valve pipe to prevent the post-grouting valve from entering a grouting pipe valve under the pressure of high-pressure slurry in a deep hole and the slurry in flowing plastic concrete to cause the failure of the grouting pipe valve, the grouting valve fails to cause the failure of the post-grouting process and the failure of the post-grouting work, the bearing capacity of a foundation pile cannot meet the design requirements, and the implementation of later-stage remedial measures is very difficult.

The traditional post-grouting valve has the following disadvantages:

1. because the strength of the material covering the grout outlet of the valve body is not high, under the pressure of deep hole mud and fluid concrete, cement paste easily enters the valve pipe to form blockage, so that the reliability of opening the valve is poor, and 100 percent of opening the valve cannot be realized;

2. solidified concrete is wrapped outside the rear grouting valve, the crushing force applied to the concrete by the high-pressure cement paste through the small holes in the valve body is small, and the resistance of the valve opening is large;

3. the structure is complex, the processing procedures are more, and the traditional post-grouting valve comprises the steps of blanking, manufacturing joint threads, welding and sealing the head of a valve pipe, drilling a grout hole on a valve body, manually wrapping a plastic sheath and the like;

4. the manufacturing cost is higher, traditional back slip casting valves big summary 20 yuan/one, and disposable uses, and the cost is higher.

The utility model discloses back slip casting valve aims at providing safe and reliable, simple structure, is fit for industrialization mass production, the lower novel hard bag formula back slip casting valve of cost.

Disclosure of Invention

In order to solve the problem, the utility model provides an safe and reliable, simple structure, suitable industrialization mass production, the lower hard bag formula post-grouting valve that is used for the bored concrete pile of cost, the technical scheme of adoption as follows:

hard bag type post-grouting valve for cast-in-place pile mainly comprises a valve body and is characterized in that the valve body is a plastic valve body molded by bodies through injection molding, a grout outlet is not formed in the surface of the plastic valve body, a bottom end cover is fixedly connected to the lower part of the plastic valve body, an upper end opening is formed in the upper end of the plastic valve body, and an inner nut is fixedly connected to the inner part of the upper end of the plastic valve body.

Preferably, the outer side surface of the valve body is further provided with a plurality of shallow grooves distributed along the axial direction, and the shallow grooves are sunken into the outer side surface of the valve body to a certain depth.

Preferably, the valve opening pressure of the valve body is less than or equal to 8 MPa.

Preferably, the valve body pressure resistance is 4MPa or more.

Preferably, the valve body is formed by injection molding of a polyethylene material.

The beneficial effects of the utility model reside in that:

1. because the hard bag type rear grouting valve has fixed strength and is not provided with a grouting hole, when the hard bag type rear grouting valve is buried in slurry of a deep hole and concrete in a flowing state, the situation of blocking the grouting hole (pipe) can not occur, and the valve body can not be damaged by the extrusion of the concrete and water head pressure;

2. the valve is opened according to the set pressure, the valve body bursting force is larger, the 100 percent valve opening rate can be ensured, and the grouting construction quality is improved;

3. the shallow groove is formed in the outer surface of the valve body along the axial direction, so that the valve body can be expanded and opened under the pressure of cement slurry;

4. the valve has simple structure, can be manufactured by adopting an injection molding process, and has lower cost than the traditional post-grouting valve.

Drawings

FIG. 1 is a schematic view of a conventional post-grouting valve

FIG. 2 is a schematic view of the structure of the present invention

FIG. 3 is a cross-sectional view of a plastic valve body

The device comprises a metal valve body with pipe threads, a bottom rubber sleeve, an outer plastic corrugated pipe, a binding iron wire, a grout outlet, a plastic valve body 6, an inner nut 7, a conical end cover 8 and a shallow groove 9.

Detailed Description

The present invention will be described in further detail at with reference to fig. 2-3 and the following detailed description of the preferred embodiment.

As shown in fig. 2-3, the hard bag type rear grouting valve for a cast-in-place pile comprises a plastic valve body 6 and an inner nut 7 located inside the upper end of the plastic valve body 6, wherein the plastic valve body 6 is made of polyethylene materials through body injection molding, a grout outlet is not formed in the surface of the plastic valve body, the inner nut 7 is placed into the upper end inside the valve body 6 when the plastic valve body 6 is injection molded, so that the inner thread 7 is fixedly connected to the plastic valve body, a bottom end cover fixedly connected to the lower end of the plastic valve body 6 is a conical end cover 8, the conical end cover 8 is connected with the plastic valve body 6 through a hot melting mode, more than 6 shallow grooves 9 uniformly distributed along the circumferential direction of the outer surface of the plastic valve body 6 are formed, and each shallow.

Furthermore, the utility model discloses in, in order to guarantee that the valve body inflation under the grout pressure splits, reach 100% open valve rate under the settlement pressure, open valve pressure less than or equal to 8MPa to can resist the pressure of high-pressure mud or mobile state concrete and not destroyed in order to make the valve in the deep hole, when valve body injection moulding, the wall thickness that will guarantee plastic valve body 6 can have the resistance to pressure of more than or equal to 4 MPa.

Taking a certain engineering project as an example, the length of a designed cast-in-place pile is 24m, the diameter of the designed pile is 800mm, the pile is divided into 7 layers according to lithologic characteristics in the depth range, namely, ploughing soil, silty clay, clay and the like, the soil layer state is soft-plastic state, the 7 th layer of clay is a hard-plastic pile end holding layer, the underground water level burial depth is 2m, the design adopts compound grouting, a hard bag type rear grouting valve is arranged at the bottom of the pile, the grouting amount is 1.2t, the valve opening pressure is 5.5MPa, a pile side hard bag type rear grouting valve is arranged at the depth of 12m, the grouting amount is 0.80t, the valve opening pressure is 5.0MPa, when the grouting is carried out, the grouting into the plastic valve body 6 is adjusted to be pressurized to be proper pressure, the plastic valve body 6 is expanded and opened, and the grouting is carried out, and the hard bag type rear grouting valve is simple to manufacture, the cost is low, and the construction efficiency is greatly improved because the conventional metal valve body is not blocked.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements can be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1, a hard bag formula post grouting valve for bored concrete pile mainly includes the valve body, its characterized in that, the valve body is the body shaping's of moulding plastics plastic valve body, the plastic valve body surface does not set up out the thick liquid mouth, lower part fixedly connected with bottom end cover, upper end opening and the inside fixedly connected with interior nut in upper end.

2. The hard bag type post-grouting valve for a cast-in-place pile according to claim 1, characterized in that the outer side surface of the valve body is further provided with a plurality of shallow grooves distributed along the axial direction, and the shallow grooves are recessed to a certain depth into the outer side surface of the valve body.

3. The hard bag type post-grouting valve for a cast-in-place pile according to claim 1 or 2, characterized in that the valve body opening pressure is less than or equal to 8 MPa.

4. The hard bag type post grouting valve for a cast-in-place pile according to claim 3, wherein the valve body is resistant to pressure of 4MPa or more.

5. The hard bag type post grouting valve for a cast-in-place pile according to claim 4, wherein the valve body is injection molded by polyethylene material.