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HR-96 type high pressure splitting grouting pipe (sleeve valve pipe)

HR-96 split grouting reinforcement is mainly used for soft soil foundation site preparation or local reinforcement, anti-seepage of dams, reinforcement of ground subsidence during construction of deep foundation pits, and plugging of seepage of foundation pits. It can be divided into single hydraulic slurry method and double hydraulic slurry method according to the different requirements for the slurry pressure at different construction sites.
HR-96 type high pressure splitting grouting pipe (sleeve valve pipe)
product description:
HR-96 split grouting reinforcement is mainly used for soft soil foundation site preparation or local reinforcement, anti-seepage of dams, reinforcement of ground subsidence during construction of deep foundation pits, and plugging of seepage of foundation pits. It can be divided into single hydraulic slurry method and double hydraulic slurry method according to the different requirements for the slurry pressure at different construction sites. Generally, the formula of single hydraulic slurry is composed of cement, fly ash, bentonite and other materials, while the double hydraulic slurry is added with water glass and other materials that can make cement quickly solidify in the formula of single hydraulic slurry, which is generally used for engineering rescue.
Common grouting methods include flower pipe grouting and one-way valve pipe grouting. Both grouting methods can be used for osmotic grouting, while split grouting can only be done with one-way valve tubes. When the soil permeability coefficient is less than 10-4 cm / s, it is generally difficult to use flower tube grouting, and the split grouting of one-way valve tube is used. It is clear that split soil grouting has the advantages of convenient construction and better results in soil layer reinforcement and tracking grouting reinforcement at a certain depth below the ground, especially for fixed-point and quantitative grouting in the deep part of the soil. Multiple and repeated grouting cannot be replaced by general flower tube pressure grouting.
Buried and used:
(1) The drilling hole diameter is generally in the range of 80-120mm? The error of drilling verticality is less than 1%
(2) Casing material in the hole The casing material is also called closed mud. After drilling to the design depth, the closed mud is poured into the drilling mud from the drill. The ring is opened in the hole, and the extruded slurry squeezes the shell material and is injected into the surrounding soil layer.
(3) Insert one-way valve pipe (split grouting pipe) into the borehole filled with closed mud. Generally, plastic pipes with an inner diameter of 40 to 60 are used, and a set of shot holes are drilled every 33 to 50 cm (ie 2 per meter). ~ 3 groups) Outer rubber sleeves, the end of the closed tube is filled with water when it is inserted into the drill hole.
(4) After the closed mud has reached a certain strength, a two-way sealed grouting core pipe is inserted into the one-way valve pipe for layered grouting. First, increase the pressure to open the rubber sleeve of the slurry and squeeze the shell material. The soil splits and spreads along the crack. The diffusion range is affected by the pressure, time, slurry ratio, and characteristics of the soil layer. . Generally grout from the bottom up. After reaching a certain pressure, lift up a section and then grout, and repeat the process. After the grouting is completed, lift up a section of grout retention liquid to facilitate the second repeated grouting (one-way valve plastic pipe is left in the soil layer after grouting).
Sleeve valve pipe (grouting pipe) grouting process I. Construction steps and precautions 1. Sleeve valve pipe grouting parameters (examples are for reference only)
(1) Grouting hole layout: hole spacing 1.5m, row spacing 1.5m, square layout, hole diameter about 90-110mm, hole depth to the bottom of the filling layer;
(2) Shell material: The mixing ratio is cement: clay: water = 1: 1.5: 1.88 (weight ratio). The clay does not contain sundries and other debris.
(3) Slurry mix ratio: determined through experiments, the reference construction drawing design tentatively sets the mix ratio (weight ratio) as: cement: fly ash: sand: stone powder: water = 1: 0.55: 4.05: 4.14: 1.09.
(4) The pump injection pressure is determined through experiments. The design of the reference construction drawing is tentatively set to the injection pump pressure of 0.8 to 1.0 MPa.
(5) Final injection standard: Final injection after the grouting pressure rises to 1.2Mpa, or under the condition of 1.0Mpa pressure, the slurry absorption reinforcement per 2m <2L / min, and the final injection will take place after the pressure is stabilized for 15min.
2. Sleeve valve tube grouting process (1) Use the on-site reference point to arrange holes with the total station according to the design requirements. Organize relevant personnel to measure and check the hole positions, and confirm that the holes can be drilled.
(2) Hole formation: ① Use conventional geoalloy drill bits or diamond drill bits and punch hammers to form holes. It is suitable for parts with shallow miscellaneous filling stones; the diameter of the hole formation is 110 mm, the verticality of the hole is less than 1.0%, and the hole position deviation Less than 50mm; ② For the phenomenon of thick miscellaneous rockfill at the drilling position, a full hydraulic impact drill should be used to form the hole, and if necessary, a full casing follow-up should be used to form the hole. This type of drilling rig comes with a crawler running device, which is easy to move and has a hole diameter of 110 to 140 mm.
(3) Hole clearing: Use the thick mud to clear the holes in the completed drilling to exclude coarse-grained slag.
(4) Lower casing material: Configure the casing material according to the designed mix ratio, and pour the casing material from the bottom of the hole up to the orifice.
(5) Sleeve valve tube: In the PVC plastic tube with a diameter of 50mm, open 8-10 small holes with a diameter of 5mm at a distance of 35mm. The opening range is about 5-8cm. The positions of the small holes are staggered with each other. A small hole about 10cm long is covered with a layer of rubber expansion ring (ie, sleeve valve) of about 3mm, and the two ends are sealed with waterproof tape.
(6) Lower sleeve valve tube: The sleeve valve tube that has been manufactured is inserted into the drilled hole after the casing is finished.
(7) Pipeline connection: after the casing material reaches a certain age (about 3-7 days), the grouting device is inserted into the sleeve valve tube, and the middle of the grouting device is about 20cm long with slotted holes. There is a stopper plug, which connects the grouting pressure pipe to the grouting device in the sleeve valve tube.
(8) Pulping: prepare cement slurry according to the design water-cement ratio.
(9) Open-loop grouting: lower the grouter to the hole section that needs grouting, start the grouting pump, and pressurize the water. During this process, the pressure gradually increases until the rubber sleeve valve and the corresponding position sleeve are opened. Shell, after the pressure returns, pump the cement slurry, and grout until the pressure specified in the design is stable; during this process, intermittent grouting can be performed according to needs or design requirements until the design requirements are met.
(10) Continuous open-loop grouting: According to the design requirements, move the grouting pipe up and down, and gradually open-loop grouting in accordance with the appeal method at each part where grouting is required, until the grouting of all the hole sections is completed.
(11) Make various records during the grouting process: open-loop position, grouting time, grouting pressure, cement usage, water-cement ratio, and special conditions during the grouting process. (12) After the grouting meets the design requirements, clean the pipeline and sleeve valve tube, and grout for the next hole.
3. Construction quality control measures (1) Material requirements: ordinary Portland cement with a strength rating of 32.5 or ore damp-caking cement should not be used. Various technical indicators of cement and other materials shall comply with the current national standards, and shall be accompanied by a factory inspection list.
(2) The slurry should be fully mixed with a stirrer after measuring according to the mixing ratio determined by the test, and continuously stirred slowly during the grouting process.
(3) Grouting speed: 20-30L / min.
(4) Segment grouting: The interval for segment grouting is considered according to 1.0-2.0m.
4. Construction matters needing attention (1) During construction, grouting method of sequential holes should be adopted, and the method of grouting construction with interval jump holes, gradual restraint, and down-up first should be adopted.
(2) When grouting the bottom of the fill, the bottom of the fill may be connected to karst fissures or karst caves, which is susceptible to active groundwater and easy to run. The following points should be noted during grouting: When the slurry is taken away, the accelerator must be added when grouting the bottom of the fill to control the setting time of the slurry to about 10-20 seconds. B. Split grouting: In order to ensure that the slurry does not run too far, intermittent quantitative split grouting should be used. C. When grouting in any borehole, the adjacent hole should be used as an observation hole to observe the drainage, exhaust, and slurry emission in the hole, and make detailed records to determine the slurry diffusion.
(3) When the amount of grouting exceeds 20% of the volume of the soil reinforced by the hole and the above-mentioned final injection standard has not been reached, the reasons shall be analyzed in time, problems such as running grouts shall be observed, corresponding measures shall be taken, and the design unit shall be reported for approval.
(4) During grouting construction, 3-5 level observation points should be set on the surface for monitoring, and cracks and lifting on the ground are not allowed. Once it is found that the ground has a tendency to generate cracks and lift, the grouting pressure and the amount of grouting must be adjusted in time.
5. Check the grouting effect 28 days after the end of grouting. For the inspection method and layout of test points, see the plan layout of monitoring test points.
6. Settlement observation of the site is required after the construction is completed to further verify the treatment effect. Therefore, settlement plates are used to observe the settlement of the foundation. For details of the layout of the monitoring points, see the plan layout of the monitoring points.
HR-96 type high pressure splitting grouting pipe (sleeve valve pipe)
Main personnel, machinery and equipment
HR-96 type high pressure splitting grouting pipe (sleeve valve pipe)

HR-96 type high pressure splitting grouting pipe (sleeve valve pipe)
III. Construction technology guarantee measures 1. Establish a technical management responsibility system headed by the person in charge of the project technology, and conscientiously improve various technical management systems. Such as the establishment and implementation of technical post technical responsibility system, material and semi-finished product inspection system, hidden engineering inspection system, technical file system, etc., to ensure that the construction process is carried out under the technical specifications and technical standards stipulated in the contract.
2. The person in charge of project technology should carefully grasp the technical management and technical preparations before construction, implementation, execution, supervision and inspection during construction, and summary and improvement of acceptance after construction. These three links must be closely linked, The interlocking really makes the construction technology play a leading role in project management.
3. During construction, all engineering projects must be operated in strict accordance with the construction technology and operating procedures to achieve standardized and standardized operations. At the same time, strengthen technical training for highly specialized types of work and strive to improve the technical quality of all employees.
4. "Three levels" in the whole construction process.
The first is to strictly control the drawings. First, carefully review the drawings, thoroughly understand the design intent, secondly organize and implement strictly in accordance with the requirements of the drawings and inspections, and organize the technical layers.
The second is to monitor off and monitor the entire construction process;
The third is to check the good materials, carefully evaluate the quality of each batch of materials, carefully select the mix ratio, without a certificate and tests that do not meet the requirements, resolutely not use.
5. Strengthen the horizontal ties with the supervision, owners and other units, get extensive support and cooperation in construction technology, and timely solve technical problems encountered in construction.
4. Safety guarantee measures 1. Safety measures (1) Set up full-time security inspectors to check on duty during construction.
(2) No one is allowed to drink alcohol during work and 4 hours before work.
(3) When entering the site, wear a helmet and work clothes.
(4) Non-operating personnel shall not approach the construction site.
(5) Prepare sufficient fire extinguishing equipment and do not use it for other purposes.
(6) The installation and maintenance of electrical equipment are operated by professional staff.
(7) The unfinished matters must comply with the safety operation regulations of each post.
2. Construction machinery and electrical equipment must not be operated with illness or overloaded. If abnormal conditions are found, they should be shut down for inspection and not repaired during operation.

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