Control the verticality of the guide frame during sinking to ensure that the verticality of the bagged sand well is controlled within 1.5%.
4.
When the casing is buried, pull out the marker pile and collect it, and do not discard it at will.
The paving should be uniform and flat to form a two-way cross slope that meets the design requirements, and use the road roller to statically press it to the required compactness.
Sand cushion laying: use qualified sand to lay sand cushion on the built road arch.
3.
(2) Construction process flow (3) hidden contents of construction points can be viewed for free after logging in 1 Well location setting out: first set out the longitudinal control piles on both sides of the subgrade with a total station, and then determine each pile location with a steel ruler and make obvious signs according to the well location layout before construction.
Preparation of construction machines and tools: check the performance of the equipment on site to keep it in good operation.
Pile head treatment: after the casing is pulled out, the sand bag should be exposed above the wellhead for more than 0.3m, and it should be vertically buried in the sand cushion.
After leveling and rolling, the cross slope, bottom width and compactness are inspected to ensure that they meet the design requirements.
If there are problems, correct them in time.
Casing driving: when the casing is hoisted and positioned, the hydraulic system can be started to sink the conduit until the design depth is reached.
Set up a temporary warehouse on site to store sand well bags and other materials.
The construction can be carried out only after the products are qualified.
Check whether there are sundries in the casing, whether the pile tip valve can be opened flexibly, whether the sealing is good, and whether the extension part is smooth and firm.
The pulling out should be carried out slowly and continuously without stopping halfway to prevent the sand bag from being damaged due to the falling of the casing.
4.
Check whether the filled sand bag is full, and whether there are cracks, necking, swelling and other phenomena in the appearance.
5.
During the construction of the bagged sand well, special personnel shall be assigned to supervise the whole process and make the original construction records, recording the setting depth, plate position error, verticality, well diameter, exposed length and other conditions of the bagged sand well~~ Recommended reading ~ ~ to be a qualified drawing reviewer, you must have the basic knowledge of drawing review, understand the wall calculation methods and precautions, and get a quick start to the project cost! Engineering visa 9 skills, turn losses into profits! Novice introduction, super detailed pile cap construction process..
The sand bags shall be full and dense, and the sand filling rate shall reach more than 95%, and the appearance shall be free of cracks, necking or swelling, and the length shall meet the design requirements.
Construction wastes shall be removed to the designated place in time for centralized treatment.
Positioning of machines and tools: during positioning, ensure that the center of the casing is at the same point with the pile position on the ground, and the deviation of the pile position does not exceed 100mm.
After pulling out the casing, check whether the head of the sand bag is full.
5.
Sand bags shall be filled manually on site.
Before installing the casing, check whether the length and diameter of the casing are consistent with the design.
Surface treatment: remove the silt, turf and sundries on the surface, transport them to the designated location with a car with a sealing groove, and treat them according to the design requirements; After the surface is dried, the surface is roughly leveled by bulldozer, and the road arch is constructed with fillers that meet the design.
The valve type pile tip is fixed at the lower end of the casing, and is manually held and accurately placed on the well position during driving.
Installation of casing and pile tip: select the casing diameter according to the diameter of the sand well.
When filling and transporting sand bags, it is strictly forbidden to drag them on the ground.
Bag sander generally adopts static pressure sander.
During the construction, check the hole forming position of the casing at any time, and whether the verticality meets the design requirements.
(4) Quality control quality control of raw materials: inspect the silt content of sand materials as required, and sample the physical and mechanical properties and sewing size of sand well bags by 5%.
Sand bag filling: the sand filled into the sand bag shall be air dried medium coarse sand, and the mud content shall not be greater than 3%.
Before driving, mark the graduation mark of the control elevation on the casing with paint.
1、 Construction preparation 1 Drawing review: review the design data, draw the layout plan of well location, and number the bagged sand well according to the construction sequence.
7.
If it is not full, sand shall be supplemented manually in time; Check whether the sand bag is pulled up with the casing.
When the pull-up depth exceeds 0.5m, it is necessary to make up again.
If the sand bag is not enough, fill the sand in the bag in time.
2.
The casing diameter should not be too large or too small.
Lower the sand bag: when lowering the sand bag, set a chute at the casing mouth, put the sand bag into the casing slowly and straightly, and drill the sand well in the bag.
The diameter of the steel pipe used is slightly larger than the diameter of the sand well, but it should not be too large.
The holes formed by casing pulling up shall be filled with sand and compacted.
2.
Unqualified materials are not used.
Pulling out the casing: the casing can be pulled out after the sand bag is in place.
6.
6.
Raw material inspection: carry out tests on various performance indexes of sand materials, and select medium coarse sand that meets the design requirements; The product certificate and performance report of sand well bags shall be checked before entering the site, and the sampling inspection of various quality indicators shall be carried out according to the inspection batch, quantity and inspection method specified in the inspection standard.
Start the hydraulic system to control the verticality of the guide frame and control it within 1.5%.
During the construction, assign a special person to observe the soil depth of the casing and whether the pile driver is inclined or displaced.
The sand well bag shall be cut according to the design length plus 0.3m to ensure that the length of the sand bag after pouring meets the design requirements.
3.
