The invention discloses a low-rebound rate and low-dust concrete nozzle device in anchor spray shoring engineering and relates to the technical field of the anchor spray shoring engineering. The effects of reducing the rebound rate and reducing dust can be achieved. The concrete nozzle device consists of a pulp-feeding pipe, a stirring and mixing pipe, a stabilizing pipe and a spray nozzle, wherein the pulp-feeding pipe is connected with the stirring and mixing pipe; the stirring and mixing pipe is designed to be divided into two parts; one part is a rotating surface with the inclination angle of 45 degrees; the other part is a stirring rod; a steel sleeve area is arranged in the place between the stirring and mixing pipe and an outer sleeve; a valve is arranged at the spray nozzle and consists of a valve head and a valve plate; the valve plate is arc.

Low-rebound rate and low-dust concrete nozzle device in anchor spray shoring engineering

The invention discloses a shaft annular disaster-caused channel grouting control design method adopting construction of a freezing shaft sinking method. The shaft annular disaster-caused channel grouting control design method comprises the steps of analysis of shaft freezing shaft sinking technical data and surrounding rock engineering geological conditions, testing of physicochemical properties of a typical grouting material, establishing of a freezing hole annular channel grouting diffusion model and a diffusion control equation, calculating of a grouting pressure theoretical value based ongrouting process control, calculating of limiting grouting pressure based on grouting safe control, selecting of grouting sections and determining of grouting final pressure and a drilling spacing design value, formulating of a grouting process control method, formulating of a grouting end standard, design of a grouting control scheme and the like. After the design method is adopted, scientific selection of shaft freezing hole grouting plugging key technical parameters is achieved, and the good grouting effect is achieved.

Shaft annular disaster-caused channel grouting control design method adopting construction of freezing shaft sinking method

The invention provides a pipe-jacking tunnel section optimization method. The pipe-jacking tunnel section optimization method comprises the following steps: firstly, pre-tunnelling is performed to enable an excavated tunnel to naturally deform, and the actual crown settlement value of a soil layer is monitored and taken as reference for follow-up judgment; crown settlement in the section shape which is the same as the excavated tunnel is calculated according to given parameters of the soil layer, the calculated value and the actual measurement value are compared, the given parameters of the soil layer conforms to the reality if the calculated value and the actual measurement value are consistent, and on the basis, inversion calculation of the overexcavation range is performed; different overexcavation section shapes are designed, crown settlements corresponding to the different overexcavation section shapes are searched repeatedly till the situation that the soil layer subjected to crown settlement is exactly right in contact with the top of a pipe-jacking pipeline without an additional clamping force, and the corresponding section subjected to overexcavation is taken as the optimal section; and crown settlements are continually monitored, the parameters of the soil layer are continually modified, and the appropriate overexcavation section shape is continually selected in the tunnelling process to ensure favorable gaps on the left and right and above pipe jacking to remove the up-and-down clamping function of the soil layer.

Pipe-jacking tunnel section optimization method

The invention discloses a tunnel and underground engineering surrounding rock fracture water grouting control design method. The tunnel and underground engineering surrounding rock fracture water grouting control design method comprises the steps of analyzing of regional geology and hydrology geology conditions, finding out of master control water-flowing-fracture-contained basic geological features, analyzing and testing of physical and chemical properties of typical grouting control materials, building of the fracture tunnel interior grouting diffusion control equation, calculation of the theoretical value of the grouting pressure based on grouting process control, calculation of limit grouting pressure based on surrounding rock stability analysis, determining of the design values of thegrouting final pressure and the drilling intervals, formulating of the grouting finishing standard, dynamic design of underground engineering surrounding rock fracture water grouting control schemesand the like. By adopting the design method, scientific selecting of key technological parameters in the tunnel and underground engineering surrounding rock fracture water grouting plugging engineering can be achieved, and the good grouting effects is achieved.

Tunnel and underground engineering surrounding rock fracture water grouting control design method

The invention belongs to the technical field of urban tunnel underground excavation construction, and particularly relates to a shallow-buried collapsible loess tunnel core soil and glass fiber anchorrod reinforcing construction method. Advanced core soil is reinforced by utilizing glass fiber grouted anchor rods, the compressive and shearing resistance ability of the advanced core soil is improved, extruding deformation of a soil body in front of a tunnel face is restricted, a reinforcing area formed by the glass fiber grouted anchor rods and advanced grouting small guiding pipes has the function of water resistance, the consolidation settlement speed of upper collapsible loess is slowed down, meanwhile, the glass fiber grouted anchor rods are easy to cut, and tunnel tunneling excavationis not affected. The core soil is reserved to exert reverse thrust to restrict strain release of stress of the front soil body, in addition, the advanced grouting small guiding pipes can form a supporting arch ring on the upper part, and collapse of soil blocks is reduced.

Shallow-buried collapsible loess tunnel core soil and glass fiber anchor rod reinforcing construction method

The invention relates to the technical field of tunnel engineering and discloses a method for processing a grouting position of a hidden cave at the bottom of a tunnel. The processing method includes the steps that firstly, cave detection is conducted, wherein an advance geological forecast method is comprehensively used for determining the position of the cave at the bottom of the tunnel according to the position of the bottom of the tunnel, and the position where the hidden cave is detected is marked; secondly, a second hole site is designed, the position of a grouting hole is designed based on the first step according to the two-dimensional stress distribution condition around a round hole in an elastic flat plate; thirdly, grouting is conducted, jet grouting is conducted on the stress concentrated part of the hidden cave for strengthening; fourthly, grouting is conducted, a compaction grouting technology is used for filling a hidden cave body. According to the method for processing the grouting position of the hidden cave at the bottom of the tunnel, the two-dimensional stress distribution state around the round hole in the elastic flat plate serve as the theoretical basis, the defect that construction is conducted by mainly relying on experience in the past is overcome, the stability of tunnel surrounding rock on the upper portion of the hidden cave is ensured, and the normal operation of the rear stage of the tunnel is ensured.

Method for processing grouting position of hidden cave at bottom of tunnel

The invention relates to the underground engineering loess tunnel safety construction field, and especially relates to the underground engineering loess tunnel ground surface settlement control construction process with strong pertinency and simple technology; settlement deformation monitor measurements are taken so as to realize dynamic monitor measurements in tunnel excavation construction, thus providing reliable data guarantee for safety construction; measurements like advanced support, steel arch centering support and timely concrete injection are taken so as to ensure tunnel surrounding rock composition stabilization; lime soil compaction piles are used for reinforcing the loess layer, and 37 lime soil is refilled, thus greatly improving construction security and composition stability; in construction, quicklime is used for chemical modification, thus optimizing loess property, improving loess intensity, and ensuring tunnel stabilization and safety.

Underground engineering loess tunnel ground surface settlement control construction process

The invention discloses a multi-stage conical synchronous expansion anchor rod which consists of a rod body, a screw nut, a tray, a tray gasket, a casing pipe gasket and a casing pipe, wherein the rod body consists of a plurality or taper bodies; an anchor head is arranged at the tail part of the rod body; the anchor head is a column body; a through grouting tube is arranged in the center of the rod body; discharge holes are formed inside the anchor head; the discharge holes are communicated with the grouting tube The casing pipe is externally shaped as a column, the inner shape of the casing pipe is matched with the taper body of the rod body, and the casing pipe is provided with two through casing pipe slots which divide the casing pipe into two parts

Multi-stage conical synchronous expansion anchoring rod

The utility model provides a plastic-steel grating hanging net supporting structure for an anchoring net support project. The plastic-steel grating hanging net supporting structure consists of a top bearing rack, a supporting rod and a triangular rack, wherein the supporting rod can stretch out and draw back automatically so that the height of the supporting rod can be adjusted; and the height of the triangular rack under the supporting rod can be adjusted according to the roughness of the ground. By the plastic-steel grating hanging net supporting structure, the problems of low efficiency, large labor capacity, complex construction, poor safety and the like in a support net hanging process can be solved effectively.

Plastic-steel grating hanging net supporting structure for anchoring net support project

The invention provides a novel anchor rod with high-strength steel wires and a grouting pipe in surrounded matching and a high shear resistant capacity, and belongs to the field of anchoring engineering. The anchor rod is a supporting and protecting device and mainly used for geology which has complicated geological conditions and is easy to enable the anchor rod to laterally deform. The anchor rod disclosed by the invention consists of the grouting pipe, a conical anchor head, an expansion pipe, a bowl-shaped tray, a nut and the high-strength steel wires, wherein the conical anchor head is arranged at the head of the anchor rod, the anchor rod is fixed to the high-strength steel wires together, and the high-strength steel wires closely and orderly surround the grouting pipe so as to be matched with the expansion pipe and the grouting pipe, so that the shear resistant capacity of the grouting pipe is ensured.

Novel anchor rod with high-strength steel wire and grouting pipe in surrounded matching and high shear resistant capacity

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Sun Jinze

Author Tools

Chat about Author