WO2021057388A1

WO2021057388A1 - Apparatus for fabricating concrete shaft wellbore model and usage method

Info

Publication number: WO2021057388A1
Application number: PCT/CN2020/112274
Authority: WO
Inventors: 张黎明; 贺可强; 孙林娜; 丛宇
Original assignee: 青岛理工大学
Priority date: 2019-09-29
Filing date: 2020-08-28
Publication date: 2021-04-01
Also published as: CN110653932A

Abstract

Disclosed are an apparatus for fabricating a concrete shaft wellbore model and a usage method, which solve the problems in the prior art in which mold dismantling easily leads to model damage and slurry leakage, and an inaccurate centering position, and which has the effects of a simple operation, accurate centering, no slurry leakage and a high success rate of mode dismantling. The technical solution thereof is: an outer cylinder and an inner cylinder that are sleeved together are comprised, a cavity that has an annular cross-section is formed between the outer cylinder and the inner cylinder, two ends of the cavity are respectively connected to special sleeves, and end parts of the outer cylinder and the inner cylinder are closed by means of special sleeves; the outer cylinder is provided with a plurality of installation slits of a fixed length along the axial direction thereof, and buckle structures are provided at the locations of the installation slits; the inner cylinder is composed of multi-segment cylinder bodies that are detachably connected, and adjacent cylinder bodies are internally provided with supporting structures.

Description

Device for making concrete shaft shaft model and using method

Technical field

The invention relates to the technical field of coal mine shaft shafts, in particular to a device for making concrete shaft shaft models and a method of use.

Background technique

As the core channel connecting production and safety, coal mine shafts have always been the focus of coal mine safety. Among them, in Huainan, Huaibei, Xuzhou, and Yanzhou areas, there were many concrete shafts in deep alluvial strata where non-mining damage occurred. The above-mentioned damaged wellbore all present the characteristics of vertical fracturing, the tank road cracks are compacted, the concrete surface is peeled off, and the wellbore has no obvious horizontal displacement, distortion, or tilt. Shaft damage not only threatens the lives of coal miners, but also causes huge economic losses to the coal mines. The bottom of the concrete shaft in the deep alluvial zone is located on the bedrock, and there is no foundation settlement problem. Mining activities and industrial and agricultural water caused the water in the Quaternary aquifer to seep into the goaf. The soil at the bottom aquifer undergoes consolidation and compression deformation, and the overlying soil subsequently undergoes settlement and deformation. The friction between the soil and the shaft produces downward negative pressure. Friction, which increases with the consolidation and compression of the soil layer.

At present, although scholars have gradually realized that the ever-increasing negative vertical friction may cause damage to the wellbore, they cannot accurately answer when the wellbore is damaged. The inventor found that some scholars used numerical simulation methods to study the deformation and failure process of concrete wellbore, which promoted the understanding of the failure mechanism of the wellbore, but the numerical simulation results lacked experimental verification. The actual coal mine concrete shaft shaft depth is several hundred meters. It is not realistic to use real-size concrete shaft to carry out the test. This requires the shaft size to be scaled down and the shaft similar model test is carried out. The production device of similar wellbore models has been reported. Since the height of similar wellbore models is more than 1m and its thickness is often no more than 5cm, the height and thickness of the wellbore are extremely inconsistent, and the production and removal of the wellbore model is very difficult. However, the existing manufacturing device has disadvantages such as complicated manufacturing process, inaccurate centering position, serious problems of slurry running and slurry leakage, mold and model sticking together, mold breakage caused by mold removal, and low mold removal success rate.

Summary of the invention

In order to overcome the shortcomings of the prior art, the present invention provides a concrete shaft shaft model making device and a use method, which have the effects of simple operation, accurate centering, no slurry leakage, and high success rate of demoulding.

The present invention adopts the following technical solutions:

A device for making a model of a concrete shaft shaft, comprising an outer cylinder and an inner cylinder sleeved together. A cavity with a circular cross section is formed between the outer cylinder and the inner cylinder. Both ends of the cavity Connect special sleeves respectively, and seal the ends of the outer cylinder and the inner cylinder through the special sleeves;

Wherein, the outer cylinder is provided with a plurality of installation slits of set length along its axial direction, and a snap structure is arranged at the position of the installation seams; the inner cylinder is composed of a plurality of detachable connected cylinders, and adjacent cylinders There is a supporting structure inside.

Further, the special sleeve is composed of a first cylinder and a second cylinder with different diameters, and the second cylinder is fixed to one end of the first cylinder, and the other end of the first cylinder is closed after pouring. .

Further, the outer diameter of the second cylinder is equal to the inner diameter of the cast wellbore, and the inner diameter of the first cylinder is equal to the outer diameter of the cast wellbore.

Further, the buckle structure includes a buckle seat fixed to the installation seam, and a connecting rib inserted into the buckle seat.

Further, the supporting structure includes a cross, and the end of the cross is fixedly connected to the inner cylinder through an arc-shaped connecting piece.

Further, the cylinders of the inner cylinder are connected end to end through V-shaped grooves.

Further, the inner and outer walls of the outer cylinder are both pasted with non-marking tape, and the outer wall of the outer cylinder is provided with a steel hoop.

Further, the outer cylinder body is made of polytetrafluoroethylene material, and the inner cylinder body is made of wood material.

A method for using a concrete shaft model making device includes the following steps:

Processing the outer cylinder: use an angle grinder to process the installation seam along the axis of the outer cylinder, and evenly arrange the buckle structure along both sides of the installation seam;

Stick non-marking tape on the inner and outer walls of the outer cylinder, and use steel hoops to reinforce it on the outside of the outer cylinder;

Processing the inner cylinder: snap multiple cylinders together, and install a cross inside the cylinder;

Pre-spread release agent on the inner wall of the outer cylinder and the outer wall of the inner cylinder (spread petroleum jelly on the inner wall of the outer cylinder, and epoxy resin on the outer wall of the inner cylinder), and let it stand for a set time;

Clamp the inner cylinder and the outer cylinder into the special sleeve at the bottom in the same direction. After pouring, the inner cylinder and the outer cylinder are clamped into the special sleeve at the top.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The two ends of the inner and outer cylinders of the present invention are connected with special sleeves, which can maintain the stability of the model; the outer cylinder is provided with installation seams, and a buckle structure is set at the position of the installation seams. Pull it out from above and open the buckle seat to detach the inner and outer walls of the wellbore model, which greatly reduces the difficulty of demolding and improves the success rate of model demolding;

(2) The inner and outer walls of the outer cylinder of the present invention are pasted with non-marking tape. Since the thickness of the non-marking tape is almost no, the influence on the model is negligible. The outer wall of the outer cylinder is laterally restrained by the steel hoop to avoid the non-marking tape. Cause excessive pressure and cause leakage;

(3) The inner cylinder of the present invention is a prefabricated wooden thin-walled cylinder, which mainly resists the squeezing force generated during pouring. The hardness of the high-quality thin-walled wooden cylinder and the resistance of the internal wooden cross can be used to avoid inward seepage;

(4) The inner cylinder and the outer cylinder of the present invention are clamped into the special casing at the bottom in the same direction. In addition to the anti-seepage effect, the relative position of the bottom of the inner and outer cylinders is fixed at the same time. When the pouring is completed, the special casing at the top is clamped In this way, the thickness of the well wall can be well determined, avoiding the inconsistency of the well wall thickness due to various reasons on the inner wall during solidification.

Description of the drawings

The drawings of the specification forming a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application.

Figure 1 is a top view of the first embodiment of the present invention;

Figure 2 is a partial view of the first embodiment of the present invention;

Figure 3 is a partial cross-sectional view of the first embodiment of the present invention;

Figure 4 is a schematic diagram of the structure of a special casing according to the first embodiment of the invention;

Figure 5 is a cross-sectional view of a special casing according to the first embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a drainage device according to the first embodiment of the present invention;

Among them, 1. Outer cylinder, 2. Inner cylinder, 3. Arc-shaped connecting piece, 4. Connecting rib, 5. Cross, 6. Special sleeve, 7. First cylinder, 8. Second cylinder.

detailed description

It should be pointed out that the following detailed descriptions are all illustrative and are intended to provide further explanations for the application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "including" are used in this specification, they indicate There are features, steps, operations, devices, components, and/or combinations thereof;

For the convenience of description, if the words "upper", "lower", "left" and "right" appear in this application, they only mean that they are consistent with the upper, lower, left, and right directions of the drawing itself, and do not limit the structure, but only It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

Term explanation part: The terms "installed", "connected", "connected", "fixed" and other terms in this application should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, an internal connection between two components, or an interaction relationship between two components. For those of ordinary skill in the art The specific meaning of the above terms in the present invention can be understood according to the specific situation.

As introduced in the background art, the prior art has the disadvantages that mold removal can easily lead to model damage, slurry leakage, and inaccurate centering position. In order to solve the above technical problems, the present invention proposes a concrete shaft shaft model making device And how to use it.

Example one:

The present invention will be described in detail below with reference to Figures 1 to 5. Specifically, the structure is as follows:

This embodiment provides a concrete shaft shaft model making device, which is suitable for making most of the shafts of similar materials, heights and thicknesses, including the outer cylinder 1, the inner cylinder 2, the special casing 6 and the supporting structure. Among them, The inner cylinder 2 is sleeved inside the outer cylinder 1, and the difference between the inner diameter of the outer cylinder 1 and the outer diameter of the inner cylinder 2 is the thickness of the well wall, which is formed between the inner cylinder 2 and the outer cylinder 1 after pouring The wellbore is poured; the outer cylinder body 1 and the inner cylinder body 2 are equipped with special casing 6 at both ends, and the supporting structure is installed inside the inner cylinder body 2.

Considering cost and reusability, the outer cylinder 1 of this embodiment is made of polytetrafluoroethylene material, and the inner cylinder 2 is a wooden thin-walled cylinder. The outer cylinder 1 is provided with a plurality of installation slits distributed at intervals and with a set length along its axial direction to avoid expansion of the outer cylinder 1, and the installation slits are opened by an angle grinder. In this embodiment, the length of the installation slit occupies 90% of the height of the outer cylinder 1, and the distance between the installation slit and the upper and lower surfaces of the outer cylinder 1 is the same.

A plurality of buckle structures are evenly arranged in each installation seam, and the outer cylinder 1 is fixed by the buckle structures. Further, the buckle structure includes a buckle seat and a connecting rib 4, the buckle seat is a metal patch with a hole, and the metal patches are arranged in groups, and the two metal patches in each group are symmetrical about the installation seam, and the metal patch One end of the metal patch is fixed to the outer cylinder 1, the other end is suspended, and the suspended end of the metal patch has corresponding openings up and down.

The connecting ribs 4 pass through each group of metal patch openings of the same installation seam in the vertical direction, and play a buckle function. In this embodiment, the connecting ribs 4 are steel bars. When removing the mold, the connecting rib 4 can be pulled out, and the buckle seat can be opened to detach the inner and outer walls of the wellbore model, thereby greatly reducing the difficulty of removing the mold and improving the success rate after the model is removed. Compared with a specially made card slot type semicircular shell, the manufacturing process is less difficult, and at the same time, the manufacturing time and material cost of waiting materials are reduced.

Since the cutting blade of the angle grinder itself has a certain thickness, the outer cylinder 1 cannot be completely closed after cutting. In order to prevent leakage, non-marking tape is pasted on the inner and outer walls of the outer cylinder 1, and the outer cylinder 1 is installed with steel The hoop imposes lateral restraint to avoid excessive pressure on the non-marking tape and cause leakage.

The inner cylinder 2 is composed of multiple detachable connected cylinders. The end of the cylinder is provided with a V-shaped groove. The adjacent cylinders are clamped together through the V-shaped groove, and the cylinder at the end has a V-shaped groove at one end. V-shaped grooves are provided at both ends of the cylinder in the middle, and a supporting structure is installed at the connection position of adjacent cylinders. In this embodiment, four cylinders are used for plugging together, and there are three supporting structures inside. It can be understood that in other embodiments, the number of cylinders can be selected according to actual requirements.

The supporting structure includes a cross 5 and an arc-shaped connecting piece 3. The four ends of the cross 5 are respectively connected to the arc-shaped connecting piece 3, and are fixedly connected to the inner wall of the inner cylinder 2 through the arc-shaped connecting piece 3. The arc adapts to the inner wall of the inner cylinder 2 and cooperates with the cross 5 to form a stable support. The inner cylinder 2 mainly resists the squeezing force generated during pouring, and the inward seepage can be avoided by using the hardness of the high-quality thin-walled wooden cylindrical pipe itself and the resistance of the internal wooden cross 5.

The special sleeve 6 is composed of a first cylinder 7 and a second cylinder 8 with different diameters. The diameter of the first cylinder 7 is larger than that of the second cylinder 8, and the second cylinder 8 is fixed to One end of the first cylinder 7 and the other end of the first cylinder 7 are closed by a circular plate, and closed after the pouring is completed. The outer diameter of the second cylinder 8 is equal to the inner diameter of the cast wellbore, and the inner diameter of the first cylinder 7 is equal to the outer diameter of the cast wellbore. In order to maintain the stability of the device, the size of the circular plate of the special sleeve 6 installed at the bottom of the inner cylinder 2 and the outer cylinder 1 can be larger than the diameter of the first cylinder 7.

Embodiment two:

This embodiment provides a method for using a concrete shaft model making device, which includes the following steps:

Processing the outer cylinder: use an angle grinder to process the installation seam along the 1 axis of the outer cylinder, and evenly arrange the buckle structure along both sides of the installation seam.

A non-marking tape is attached to the inner and outer walls of the outer cylinder 1, and a steel band is used to reinforce the outer cylinder 1 outside.

Processing the inner cylinder: clamp multiple cylinders together, and install the cross 5 inside the cylinder.

Apply a release agent uniformly on the inner wall of the outer cylinder 1 and the outer wall of the inner cylinder 2 in advance, and let it stand until the release agent is no longer in a flowable liquid state, and then assemble; among them, under the condition of ensuring the effect, try A variety of release agents, the conventional oiling scheme is not effective, and the oil will penetrate into the slurry to affect the strength of the model. Finally, according to the affinity test of the concrete and various release agent materials on site, the Vaseline is applied to the outside in this example Coat the inner wall of the cylinder 1 with epoxy resin on the outer wall of the inner cylinder 2.

The inner cylinder and the outer cylinder are clamped into the bottom special sleeve 6 in the same direction. In addition to the anti-seepage effect, the bottom special sleeve 6 can fix the relative position of the bottom of the inner cylinder 2 and the outer cylinder 1 at the same time. In order to reduce the material waste caused by too much material to be poured and the pouring port is too small during pouring, the wellbore cannot be poured at one time and stratification occurs, or the material ratio caused by multiple mixing is different, resulting in the overall The test result is not good, and the drainage device is used to assist the pouring.

As shown in Figure 6, the drainage device includes a solid cylinder placed in the inner layer and a drainage cylinder placed in the outer layer. The lower end of the drainage cylinder is a cylinder with the same diameter as the outer cylinder, and the upper end is a large enough diameter. (It can be determined according to the actual pouring amount) The two cylinders are connected by a tapered inclined surface as a whole. The solid cylinder in the inner layer prevents the material from flowing out of the middle of the inner wall, and the drainage tube enlarges the diameter of the poured material, which greatly increases the pouring speed and reduces the wasted material.

After pouring is completed, the inner cylinder 2 and the outer cylinder 1 are clamped into the top special casing 6 to determine the thickness of the well wall, which avoids the problem of inconsistent well wall thickness due to various reasons during the solidification period.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A model making device for a concrete shaft shaft, which is characterized in that it comprises an outer cylinder and an inner cylinder sleeved together, and a cavity with an annular cross section is formed between the outer cylinder and the inner cylinder. The two ends of the cavity are respectively connected with special sleeves, and the ends of the outer cylinder and the inner cylinder are sealed by the special sleeves;

Wherein, the outer cylinder is provided with a plurality of installation slits of set length along its axial direction, and a snap structure is arranged at the position of the installation seams; the inner cylinder is composed of a plurality of detachable connected cylinders, and adjacent cylinders There is a supporting structure inside.
The device for making a model of a concrete shaft shaft according to claim 1, wherein the special casing is composed of a first cylinder and a second cylinder with different diameters, and the second cylinder is fixed on the first circle. One end of the cylinder and the other end of the first cylinder are closed after pouring is completed.
The device for making a model of a concrete shaft shaft according to claim 2, wherein the outer diameter of the second cylinder is equal to the inner diameter of the cast shaft, and the inner diameter of the first cylinder is equal to the outer diameter of the cast shaft.
The device for making a model of a concrete shaft shaft according to claim 1, wherein the buckle structure comprises a buckle seat fixed to the installation seam, and a connecting rib inserted into the buckle seat.
The device for making a model of a concrete shaft shaft according to claim 1, wherein the supporting structure comprises a cross, and the end of the cross is fixedly connected to the inner cylinder through an arc-shaped connecting piece.
The device for making a model of a concrete shaft shaft according to claim 1, wherein the cylinders of the inner cylinder are connected end to end through V-shaped grooves.
The device for making a model of a concrete shaft shaft according to claim 1, wherein the inner and outer walls of the outer cylinder are covered with non-marking tape, and the outer wall of the outer cylinder is provided with a steel hoop.
The device for making a model of a concrete shaft shaft according to claim 1, wherein the outer cylinder is made of polytetrafluoroethylene material, and the inner cylinder is made of wood material.
The use method of a concrete shaft model making device according to any one of claims 1-8, characterized in that it comprises the following steps:

Processing the outer cylinder: use an angle grinder to process the installation seam along the axis of the outer cylinder, and evenly arrange the buckle structure along both sides of the installation seam;

Stick non-marking tape on the inner and outer walls of the outer cylinder, and use steel hoops to reinforce it on the outside of the outer cylinder;

Processing the inner cylinder: snap multiple cylinders together, and install a cross inside the cylinder;

Pre-apply release agent on the inner wall of the outer cylinder and the outer wall of the inner cylinder, and let it stand for a set time;

Clamp the inner cylinder and the outer cylinder into the special sleeve at the bottom in the same direction. After pouring, the inner cylinder and the outer cylinder are clamped into the special sleeve at the top.
The method of using a device for making a model of a concrete shaft shaft according to claim 9, characterized in that petrolatum is applied to the inner wall of the outer cylinder, and epoxy resin is applied to the outer wall of the inner cylinder.