The invention discloses a multi-step multi-guide-hole construction organization method. The method comprises: step one, carrying out advanced supporting by using pipe roofing combined with a freezingconstruction process and a grouting method; step two, carrying out excavation of a first-step guide hole; step three, carrying out excavation of a second-step guide hole; step four, carrying out excavation of a third-step guide hole; step five, carrying out excavation of a fourth-step guide hole; and step six, carrying out excavation of a fifth-step guide hole. According to the multi-step multi-guide-hole construction organization method provided by the invention, on the basis of an eighteen-word-based principle including advanced management, strict grouting, short excavation, strong support,fast closing, and diligent measurement, the method is scientific and reasonable and has high safety and reliability. Construction of all steps of all guide holes is prompted coordinately in order, sothat the construction interference is reduced, the resources are configured reasonably, and the construction organization efficiency is improved.

Multi-step multi-guide-hole construction organization method

The invention discloses a drilling construction method for grouting and reinforcing a caving zone in goaf. The phenomena of drill sticking, drill dropping and grout leakage during the drilling construction process of the caving zone in the goaf are effectively avoided, and the drilling efficiency is effectively improved. The drilling construction method comprises the following steps that 1, a drill bit drilling machine is used for drilling on a shallow layer of the ground surface to form a first-step drill hole; 2, the drilling machine is taken out, and a seamless steel pipe is driven into thefirst-step drill hole to form a hole opening tube; 3, a small-diameter drill bit is replaced for drilling downward in the hole opening tube by adopting a mud protection wall to form a second-step drill hole; 4, a grouting pipe is lowered to the bottom of the hole for low-pressure grouting, and an initiation small-diameter low-pressure grouting body with a certain height is formed on the upper part of the caving zone; 5, drilling is performed downward from the earth surface through the hole opening tube to the position at a distance of 0.5m-1.0m from the initiation small-diameter low-pressuregrouting body; 6, a grouting pipe is lowered to the bottom of the hole, the low-pressure grouting is performed to form a subsequent small-diameter low-pressure grouting body integrally and fixedly combined with the initiation small-diameter low-pressure grouting body below the initiation small-diameter low-pressure grouting body; and 7, the step 5 and the step 6 are repeated until drilling is performed down to the bottom of the caving zone, and the low-pressure grouting body is brought to the design depth by penetrating through the caving zone.

Drilling construction method for grouting and reinforcing caving zone in goaf

The invention discloses a tunnel initial support water seepage grouting treatment construction method, and belongs to the technical fields related to tunnel construction. The tunnel initial support water seepage grouting treatment construction method comprises the following five steps of 1, preparing a grouting material; 2, arranging a grouting guide pipe; 3, conducting drilling; 4, conducting grouting; 5, processing the exposed part of the grouting guide pipe. The initial support water seepage situation in the tunnel construction process can be well treated, the grouting effect is good, the anti-seepage time is long, a powerful guarantee is provided for safe construction, and the method has wide application prospects in the technical fields related to tunnel construction.

Tunnel initial support water seepage grouting treatment construction method

The invention discloses a method for quickly connecting heavy supports with pipe curtains on the basis of advanced supporting. The method comprises the steps that the first-layer step middle pipe curtain is connected with a vertical support and a horizontal support, and the horizontal support of a first-layer step adopts two H-shaped steel parts for forming a double-spliced cross support; verticalsupports in other steps all adopt two section steel parts for forming double-spliced vertical supports connected through bolts, the upper and lower ends of each double-spliced vertical support are connected and spliced through reserving bolt holes, and the lower end of the double-spliced vertical support in the lowest-layer step is welded to the corresponding pipe curtain; the pipe curtains in other steps are connected with the corresponding horizontal supports, and the horizontal supports in other steps adopt single H-shaped steel parts for forming single-spliced cross supports. The providedmethod for quickly connecting the heavy supports with the pipe curtains is beneficial to fast completion of a support system and improves the work efficiency.

Method for quickly connecting heavy steel with pipe curtains on basis of advanced supporting

The invention discloses a monitoring and alarming device for horizontal displacement of a deep foundation pit and an operation method thereof. The monitoring and alarming device comprises a display device and an alarming device. The display device includes a PVC pipe, a PVC pipe holder and a spirit level. The PVC pipe is inserted into the PVC pipe holder, and the spirit level is installed in clamping grooves symmetrically formed in two sides of the PVC pipe. The alarming device includes an alarm, power supply, a steel bar and a steel ball. The steel bar is pre-embedded in a support and a crownbeam, one end of the steel bar extends into the spirit level, the steel ball is placed in a small hole formed in the spirit level, the steel ball is connected with the power supply used for providingelectricity to the alarm through an electric wire penetrating though one end of the spirit level, the power supply is connected with the alarm through an electric wire, and the alarm is connected with the steel bar through another electric wire. The distance between the steel ball and the steel bar is equal to the alarm value of 30mm, when the displacement of the support and the crown beam reaches 30mm, the steel ball rolls 30mm to be in contact with the steel bar, circuits of the alarm are connected, and the current is generated, the alarm sends alarm sound to remind construction workers, labor can be saved, and the safety of the foundation pit is increased.

Monitoring and alarming device for horizontal displacement of deep foundation pit and operation method thereof

The invention discloses a five-step fourteen-portion excavation method under an advanced and strengthened support system. A large section of a tunnel is divided into five steps and fourteen portions for excavation; initial support adopts 22b I-shaped steel, the spacing is 30cm, and the thickness of C25 sprayed concrete is 30cm; and temporary support adopts HW 400x400x13 steel, the spacing is 1.2m,a first row horizontal support and all vertical supports are splice in two, and a second row horizontal support, a third row horizontal support and a fourth row horizontal support are single. The five-step fourteen-portion excavation method under the advanced and strengthened support system has the beneficial effects that an excavation cross section of a first layer pilot tunnel is large, and mechanized excavation construction is facilitated; the excavation processes is reasonable, the frozen soil strength is high, the stability is good, and it is ensured that the tunnel face is stable and safe in structural force; a middle pilot tunnel is excavated in advance to weaken frozen earth on two sides of the pilot tunnel, the excavation difficulty of the frozen earth is reduced, and the construction efficiency is improved; the middle pilot tunnel only has a temporary support process, and the construction speed is high; reasonable monitoring and measurement arrangement can effectively monitor the risks of excavation and effectively guide the dynamic construction in the excavation process; and the five-step fourteen-portion excavation method is safe and reliable, and can effectively reduce the risks of instability, collapse, excessive deformation of a support system and the like of the tunnel face.

Five-step fourteen-portion excavation method under advanced and strengthened support system

The invention discloses a horizontal grouting construction method under a closed environment. The horizontal grouting construction method comprises the steps that grouting is conducted on the obverseside of a tunnel, and lap joint is conducted by 10 m in each cycle of 50 m; and as for first circulating, seventy-six grouting holes are formed, wherein the depths of the B1-B9 holes are 15 m, the depths of the A1-A67 holes are 50 m, the diffusion radius is 1.3 m, a drainage hole is 40 m in length and formed in the bottom, a flowmeter is mounted at a drainage opening and used for counting the drainage amount. The horizontal grouting construction method under the closed environment is simple, convenient and high in operability; double control over the grouting pressure and the grouting amount is put forward, a 'double-control and speed decreasing' principle is adopted in the construction process, and a closed body and stratum deformation can be effectively controlled; the grouting order isthat grouting is conducted on the outer side firstly and then grouting is conducted in the center, and the influence of grouting on the closed body is reduced advantageously due to the fact that the grouting is conducted on the outer side firstly; the emphasis is laid on informatization construction, and adjusting of parameters of the grouting pressure, grouting speed, grouting amount and the likeis guided through the monitoring situation; a 50 m of soil body can be horizontally reinforced at a time, and quick centralized construction is facilitated; and the horizontal grouting construction method under the closed environment is safe, reliable, efficient, economic and practical.

Horizontal grouting construction method under closed environment

The utility model discloses a tube coupling horizontal displacement's monitoring devices under pipe -roof advance support condition. The fastener setting that is used for fixed steel wire sets up steel wire measurement station mark at the both ends of steel wire on, be equipped with pipe wall measurement station mark on the pipe wall of treating monitoring pipe festival junction, and steel wire measurement station mark corresponds the setting with pipe wall measurement station mark, constitutes a set of horizontal displacement measurement station, prison time measuring, with the fastener be fixed in respectively on the pipe wall of the tube coupling entrance to a cave with the least significant end treat the monitoring pipe wall on, make the steel wire be the horizontality of tightening, the line of pipe wall measurement station mark and corresponding with it steel wire measurement station mark is perpendicular with the steel wire. Through measuring measurement station distance, horizontal displacement monitors to the tube coupling, solved the monitoring during the tube coupling inner space narrow and small, the problem of monitoring difficulty has effectively reduced constructioncost, simultaneously, not photic lines spare restraint when the device uses, the external environment influence is less, and measurement accuracy is higher, it is simple that it still has a methods ofmeasurement, measures the short characteristics of required time.

Tube coupling horizontal displacement's monitoring devices under pipe -roof advance support condition

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Five-step fourteen-portion excavation method under advanced and strengthened support system

Horizontal grouting construction method under closed environment

Tube coupling horizontal displacement's monitoring devices under pipe -roof advance support condition