CN111021334A

CN111021334A - Underground space jet backfill process

Info

Publication number: CN111021334A
Application number: CN201911383097.8A
Authority: CN
Inventors: 张斌; 马安刚; 马恒山; 施辰安
Original assignee: Gansu Zhonglian Construction Engineering Technology Co ltd
Current assignee: Gansu Zhonglian Construction Engineering Technology Co ltd
Priority date: 2019-12-28
Filing date: 2019-12-28
Publication date: 2020-04-17

Abstract

The invention discloses an underground space jet backfill process, which belongs to the technical field of underground construction and mainly comprises the following steps: air compressor, stirrer, sprayer and spraying pipe; materials commonly used: discrete materials such as soil, sand, cement, fly ash and lime can be used singly or in a mixed manner, when the materials are used in a mixed manner, the optimal mixing ratio is determined by trial spraying according to the characteristics of the used materials such as dry density and water content, the air compressor provides high-pressure air, the pressure can be adjusted between 1 MPa and 10MPa according to the distance of spraying distance, the power of the air compressor is not less than 5KW, the volume is not less than 3m3, the material is mixed by the mixer, the backfill material is filled into the mixer according to the ratio determined by the test and is fully mixed to form a uniform mixture, the air inlet of the spraying machine is connected with the air compressor, and the material inlet is connected with; the underground space is safely, effectively and quickly backfilled reliably to ensure the safety of buildings and constructions.

Description

Underground space jet backfill process

Technical Field

The invention relates to the technical field of underground engineering, in particular to an underground space jet backfill process.

Background

Collapsible loess and filled soil can collapse after being soaked in water, the salt in saline soil area can cause the foundation to collapse, the existing underground spaces such as abandoned mine holes, air holes, karst caves and the like can generate a series of adverse effects on construction engineering, traffic engineering, artificial activities and the like, for example, the urban ground which is frequently generated in recent years collapses suddenly and the like, especially the construction of collapsible loess sites, the condition that the soil body at the bottom of the building foundation sinks and is emptied due to the foundation soaking frequently occurs, the safety of the building is seriously affected, and the backfilling needs to be timely and effectively carried out to ensure the use safety of the building and the safety of lives and properties of people.

Disclosure of Invention

The underground space backfill method has the advantages of safely, effectively and quickly reliably backfilling the underground space to ensure the safety of buildings and constructions.

The invention is realized in this way, a underground space jet backfill process, which uses main equipment: air compressor, stirrer, sprayer and spraying pipe; the common materials are as follows: discrete materials such as soil, sand, cement, fly ash, lime and the like can be singly used or mixed for use, and the optimal mixing proportion is determined by trial spraying according to the characteristics of the used materials such as dry density and water content when the discrete materials are mixed for use.

Preferably, the air compressor provides high-pressure air, the pressure can be adjusted between 1-10 MPa according to the distance of the spraying, the power of the air compressor is not less than 5KW, and the volume is not less than 3m 3.

Preferably, the stirrer is used for mixing materials, the backfill materials are filled into the stirrer according to the proportion determined by the test and are fully mixed to form a uniform mixture.

Preferably, the air inlet of the injection machine is connected with an air compressor, the feed inlet is connected with a stirrer, and the mixed mixture is sprayed out by utilizing high-pressure air.

Preferably, the injection conduit, which is connected to the injection machine, delivers injected material to the target area.

Preferably, the sprayed materials are tightly combined together under the action of high air pressure and are stacked one on another, and finally the aim of backfilling the hollow space is fulfilled.

Preferably, the ejected material forms a stack body with a certain compactness, and no construction waste is formed during secondary excavation.

Preferably, the air compressor, the stirrer and the jet machine are all mechanical equipment which is mature in the market at present.

Compared with the prior art, the invention has the beneficial effects that:

1. the mixture sprayed by the process can form a discrete accumulation body with certain compactness, and block construction waste can not be formed. The general compactness can reach 0.8 ~ 1.0, is the fixed accumulation body when not disturbing, is the discrete body when excavation or disturbance, makes things convenient for later stage secondary development, clears away.

2. The materials are common building materials, and the materials such as local soil, sand, cement and the like are used, so the materials are easy to obtain, and the cost is low.

3. The equipment is simple and is common mature building equipment in the current market.

4. During construction, personnel can stand in a safe area to spray to a dangerous underground area, and potential safety hazards of the personnel are eliminated.

5. The construction equipment does not need to enter the cavity, is arranged in a safe area on the ground, and sends the materials into the cavity by using the pipeline.

6. The operation is convenient, when the bottom of the building foundation is hollowed to form a cavity, the pipe is only required to be stretched into the cavity, and the operating personnel can move the spraying direction outside the cavity to finish the spraying and backfilling of the whole underground cavity.

7. No waste material is produced, and the materials scattered outside during the injection can be collected and continuously injected. Compared with concrete, if scattered outside, the concrete can be solidified and cannot be used for the second time.

8. The method is not influenced by air temperature, because the sprayed material is discrete material, the air temperature has no influence on the sprayed backfill quality, and compared with concrete, the construction can not be carried out when the air temperature is low.

Drawings

FIG. 1 is a construction drawing of an underground space jet backfill process according to the present invention;

FIG. 2 is a schematic diagram of the construction of the underground space jet backfill process.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1-2, the present invention provides a technical solution: an underground space jet backfill process comprises an air compressor, a stirrer, a jet machine and a jet pipe; the common materials are as follows: discrete materials such as soil, sand, cement, fly ash, lime and the like can be singly used or mixed for use, and the optimal mixing proportion is determined by trial spraying according to the characteristics of the used materials such as dry density and water content when the discrete materials are mixed for use;

specifically, the air compressor machine provides high-pressure air, and according to jet distance's distance, pressure can be adjusted between 1 ~ 10MPa, and air compressor machine power is not less than 5KW, and the volume is not less than 3m 3.

In this embodiment: according to the distance of the jet distance, the power, the volume and the pressure value of the air compressor are limited, and the stability of equipment construction is guaranteed.

Specifically, the materials are mixed by a mixer, the backfill materials are filled into the mixer according to the proportion determined by the test and are fully mixed to form a uniform mixture.

In this embodiment: the stirring materials are stirred in uniform proportion, and the construction quality is ensured according to the proportion determined by effective experiments

Specifically, an air inlet of the injection machine is connected with an air compressor, a feed inlet of the injection machine is connected with a stirrer, and mixed mixture is sprayed out by utilizing high-pressure air.

In this embodiment: the mixed materials which are well mixed and stirred are sprayed out by high-pressure air in a connection mode, so that the method is simple and convenient.

Specifically, a spray line, coupled to the sprayer, delivers the sprayed material to the target area.

In this embodiment: the spraying machine connects the mixture with the pipeline and conveys the fixed sprayed target area, thereby ensuring the conveying safety of the equipment.

Specifically, under the action of high air pressure, the sprayed materials are tightly combined together and are stacked one on another, and finally the aim of backfilling the hollow space is fulfilled.

In this embodiment: the material is stirred, and the mixed material is pressurized by high air pressure, so that the mixed material is tightly connected, and the aim of backfilling the hollow space is fulfilled.

Specifically, the ejected material forms a stack body with a certain compactness, and building rubbish cannot be formed during secondary excavation.

In this embodiment: because the mixture that sprays, the compactness is high, has the accumulational body of certain compactness, can not have building rubbish, more energy-concerving and environment-protective.

Specifically, the air compressor, the stirrer and the jet machine are all mature mechanical equipment in the current market.

In this embodiment: the method has the advantages that the process structure is changed, the defects in the prior art are changed, and the method is rich in certain practicability.

The working principle is as follows: firstly, excavating a channel capable of entering an underground cavity in the open space around a building, entering equipment materials, connecting a water source and a power supply (220V and 380V), and measuring the injection materials: the water content and the dry density of the soil and the sand, mechanical equipment is arranged on the ground, each equipment is connected and debugged, then, the mixture is firstly sprayed on the ground in an empirical matching ratio, parameters such as the ratio of each material, air pressure, feeding speed and the like are continuously adjusted so as to be sprayed smoothly, the solidity of the sprayed accumulation body is measured (a cutting ring method and a sand filling method can be adopted), when the compactness can not meet the design requirement, adjusting various parameters again until the ejected density meets the requirement, manually moving the ejection pipeline into the channel opening to start ejection, forming a certain gradient on the ejection surface, according to the difference of the adhesive force of the injection material, a certain slope can be formed, the operator controls the injection direction to inject the injection material to each position in the hollow, the injection material is gradually accumulated to the opening of the passage in the hollow, finally the whole hollow is backfilled, and the passage excavated at the periphery of the backfilled building is tamped.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A jet backfill process for underground space uses main equipment: air compressor, stirrer, sprayer and spraying pipe; the common materials are as follows: discrete materials such as soil, sand, cement, fly ash, lime and the like can be singly used or mixed for use, and the optimal mixing proportion is determined by trial spraying according to the characteristics of the used materials such as dry density and water content when the discrete materials are mixed for use.

2. The underground space jet backfill process according to claim 1, characterized by: the air compressor machine provides high-pressure air, and according to jet distance's distance, pressure can be adjusted between 1 ~ 10MPa, and air compressor machine power is not less than 5KW, and the volume is not less than 3m 3.

3. The underground space jet backfill process according to claim 1, characterized by: and mixing the materials by the stirrer, and filling the backfill materials into the stirrer according to the proportion determined by the test for full mixing to form a uniform mixture.

4. The underground space jet backfill process according to claim 1, characterized by: and the air inlet of the injection machine is connected with an air compressor, the feed inlet is connected with a stirrer, and the mixed mixture is sprayed out by using high-pressure air.

5. The underground space jet backfill process according to claim 1, characterized by: the injection pipe connected with the injection machine conveys the injected material to a target area.

6. The underground space jet backfill process according to claim 1, characterized by: under the action of high air pressure, the sprayed materials are tightly combined together and are stacked one on another, and finally the aim of backfilling the hollow space is fulfilled.

7. The underground space jet backfill process according to claim 1, characterized by: the ejected material forms a stack body with certain compactness, and building rubbish cannot be formed during secondary excavation.

8. The underground space jet backfill process according to claim 1, characterized by: the air compressor, the stirrer and the jet machine are all mature mechanical equipment on the market at present.