1. A safe embedding method of a freezing pipe is characterized by comprising the following steps: after the embedding position is confirmed, firstly, arranging an installation hole which does not penetrate out on the face of the tunnel, placing an orifice pipe, and sealing and butting a middle pipe and a front pipe in sequence along the front end of the orifice pipe, wherein the front part of the orifice pipe is provided with a bypass valve, the middle pipe is provided with a valve or is a valve per se, and the front pipe is provided with an annular sealing mechanism; then, the freezing pipes are used as drill pipes, a drilling machine drives the freezing pipes to pass through a front pipe, a middle pipe with a opened valve and an orifice pipe with a closed bypass valve and then drill, the front end of the first freezing pipe is closed, the other freezing pipes are sequentially communicated and lengthened, in the drilling process, the valve is closed when the freezing pipes need to be replaced or pulled out, the bypass valve is opened and released when the pressure is too high, and the bypass valve is opened and slurry is replenished when the slurry is too much lost; after the drilling is carried out to the designed depth, the middle pipe and the front pipe are firstly detached, the annular space between the orifice pipe and the freezing pipe is blocked, then the bypass valve is opened and filled, and the freezing pipe is prevented from shifting and muddy water is prevented from entering.

2. A method of securely burying a freezing pipe as claimed in claim 1, wherein: at least four reinforcing points are distributed on the outer wall of the orifice pipe, and each reinforcing point is connected with the expansion screw on the tunnel face through a connecting steel plate.

3. A method of securely burying a freezing pipe as claimed in claim 1, wherein: the designed embedding position is measured and lofted on the tunnel face to confirm the embedding position, and when the adjustment is needed according to the actual situation on site, the deviation between the actual position and the designed position is not more than 100 mm.

4. A method of securely burying a freezing pipe as claimed in claim 1, wherein: when the embedding position is confirmed, a temperature measurement monitoring position where freezing is possibly unfavorable is found and marked, temperature monitoring and heat preservation are enhanced in an active freezing period, and the freezing effect is ensured.

5. A method of securely burying a freezing pipe as claimed in claim 1, wherein: a horizontal drilling platform is erected before drilling by the drilling machine, construction is carried out from bottom to top during drilling, and the horizontal drilling platform is gradually increased and erected.

6. A method of securely burying a freezing pipe as claimed in claim 1, wherein: when the mounting hole is opened, the core is drilled by a core drill bit, and then the core is wedged by a steel wedge and taken out.

7. A method of securely burying a freezing pipe as claimed in claim 1, wherein: the adjacent freezing pipe sections are connected through the sleeve screw threads and then welded.

8. A method of securely burying a freezing pipe as claimed in claim 1, wherein: and after the drilling is carried out to the designed depth, the annular space between the orifice pipe and the freezing pipe is sealed and plugged by welding an annular steel plate.

9. A method of securely burying a freezing pipe as claimed in claim 1, wherein: the valve is a ball valve or a gate valve.

10. A method of securely burying a freezing pipe as claimed in claim 1, wherein: the annular sealing mechanism is sealing filler.

Background

In a stratum with fine powder, sand, gravel and pebbles and high water content, a drainage channel is generally excavated and constructed by adopting a horizontal freezing and reinforcing soil body mining method, namely, a peripheral soil body of the drainage channel is firstly reinforced by a freezing method, then a tunnel door diaphragm wall of the drainage channel is broken, and the drainage channel is excavated by adopting the mining method. When the freezing method is used for reinforcement, the freezing pipe needs to be buried in the soil body so as to facilitate the temperature reduction of the soil body, at present, the hole is drilled on the face, and then the freezing pipe is placed, but because the freezing pipe is located in a stratum with fine powder, sand, gravel and pebbles and high water content, the phenomena of pipe breakage, sand leakage and water leakage are easy to occur in the drilling process, and the construction risk is very high.

Disclosure of Invention

The invention aims to provide a safe embedding method of a freezing pipe, which avoids slurry leakage, water inrush and unbalanced water inlet and outlet quantity and reduces the construction period.

The technical scheme adopted by the invention is as follows:

a safe embedding method of a freezing pipe comprises the steps that after an embedding position is confirmed, firstly, an installation hole which does not penetrate out of a tunnel face is formed in the tunnel face, an orifice pipe is placed in the installation hole, a middle pipe and a front pipe are sequentially in sealing butt joint along the front end of the orifice pipe, a bypass valve is arranged at the front part of the orifice pipe, the middle pipe is provided with or is a valve, and an annular sealing mechanism is arranged on the front pipe; then, the freezing pipes are used as drill pipes, a drilling machine drives the freezing pipes to pass through a front pipe, a middle pipe with a opened valve and an orifice pipe with a closed bypass valve and then drill, the front end of the first freezing pipe is closed, the other freezing pipes are sequentially communicated and lengthened, in the drilling process, the valve is closed when the freezing pipes need to be replaced or pulled out, the bypass valve is opened and released when the pressure is too high, and the bypass valve is opened and slurry is replenished when the slurry is too much lost; after the drilling is carried out to the designed depth, the middle pipe and the front pipe are firstly detached, the annular space between the orifice pipe and the freezing pipe is blocked, then the bypass valve is opened and filled, and the freezing pipe is prevented from shifting and muddy water is prevented from entering.

Furthermore, at least four reinforcing points are distributed on the outer wall of the orifice pipe, and each reinforcing point is connected with the expansion screw on the tunnel face through a connecting steel plate.

Furthermore, the designed embedding position is measured and lofted on the tunnel face to confirm the embedding position, and when the adjustment is needed according to the actual situation on site, the deviation between the actual position and the designed position is not more than 100 mm.

Furthermore, when the embedded position is confirmed, a temperature measurement monitoring position where freezing is possibly unfavorable is found and marked, temperature monitoring and heat preservation are enhanced in the positive freezing period, and the freezing effect is ensured.

Furthermore, a horizontal drilling platform is erected before drilling by the drilling machine, construction is carried out from bottom to top during drilling, and the horizontal drilling platform is gradually increased and erected.

And further, when the mounting hole is opened, the core is drilled through a core drill bit, and then the core is cut off by a steel wedge and taken out.

Furthermore, adjacent freezing pipe sections are connected through the sleeve threads and then welded.

Furthermore, after drilling to the designed depth, the annular space of the orifice pipe and the freezing pipe is sealed by welding an annular steel plate.

Further, the valve is a ball valve or a gate valve.

Further, the annular sealing mechanism is sealing filler.

The invention has the beneficial effects that:

according to the invention, the freezing pipe is taken as a drill rod, the front end of the first section of freezing pipe is closed, and the freezing pipe passes through the front pipe in a sealing manner through the annular sealing mechanism, so that slurry leakage during drilling is avoided, the pollution of slurry leakage to the site is reduced, the cost of slurry treatment and outward transportation is reduced, and the water consumption during drilling is reduced; in the drilling process, the valve is closed when the freezing pipe needs to be replaced or pulled out, so that the water burst phenomenon is avoided; in the drilling process, the bypass valve is opened to release when the pressure is overlarge, and is opened and slurry is replenished when the slurry is excessively lost, so that the water inlet and outlet amount can be controlled, the water inlet and outlet amount is prevented from being unbalanced, the damage to the frozen hole due to the overlarge pressure is avoided, and the stratum sedimentation due to the excessive loss is also avoided; in the invention, the freezing pipe is used as a drill rod, so that the cost is saved and the construction period is shortened.

Drawings

FIG. 1 shows a first embodiment of the present invention in which a freezing pipe is buried.

FIG. 2 shows a second embodiment of the present invention in which a freezing pipe is buried.

Fig. 3 is an installation elevation of the orifice tube of the present invention.

Fig. 4 is a schematic view showing the connection of the first freezing pipe and the next freezing pipe in the present invention.

In the figure: 1-palm surface; 2-orifice tube; 3-a bypass valve; 4-connecting steel plates; 5-expansion screw; 6-middle tube; 7-front pipe; 8-an annulus sealing mechanism; 9-freezing the tube;

Detailed Description

The invention is further described below with reference to the figures and examples.

As shown in fig. 1 and 2, in the first and second embodiments, the safe burying method of the freezing pipe includes the steps of:

s1, confirming the embedding position: measuring and lofting the designed embedding position on the tunnel face 1 to confirm the embedding position, wherein when the adjustment is needed according to the actual situation of the site, the deviation between the actual position and the designed position is not more than 100 mm;

when the embedding position is confirmed, a temperature measurement monitoring position where freezing is possibly unfavorable is found and marked, temperature monitoring and heat preservation are enhanced in an active freezing period, and the freezing effect is ensured.

S2, opening a mounting hole which does not penetrate out of the tunnel face 1 and placing the orifice pipe 2: firstly, drilling by a core bit, then using a steel wedge to wedge the core and taking out, finally inserting the core tube 2, and opening a hole by using a J-200 type diamond drilling machine which can be matchedThe 130mm diamond core bit drilled a hole to a depth of about 250 mm.

S3, sequentially and hermetically butting a middle pipe 6 and a front pipe 7 along the front end of an orifice pipe 2, wherein the front part of the orifice pipe 2 is provided with a bypass valve 3, the middle pipe 6 is provided with or is a valve, and the front pipe 7 is provided with an annular sealing mechanism 8; and (4) setting up a horizontal drilling platform.

S4, taking the freezing pipe 9 as a drill rod, and driving the freezing pipe 9 to pass through the front pipe 7, the middle pipe 6 with the opened valve and the bypass valve in a sealing manner through the annular sealing mechanism 8 by the drilling machine3, drilling is carried out after the orifice pipe 2 is closed, wherein an MD-80A drilling machine can be adopted as the drilling machine, and an MD-80A drilling machine can be adopted as the freezing pipe 989 x 8 mm, the annular sealing mechanism 8 can adopt sealing filler, as shown in fig. 4, the front end of the first section of freezing pipe 9 is closed, the other sections of freezing pipes 9 are sequentially communicated and lengthened, the adjacent freezing pipe sections 9 are connected through the sleeve thread and then welded, and manual arc welding is used for welding, so that the concentricity and the welding strength are ensured;

s5, in the drilling process, the valve is closed when the freezing pipe 9 needs to be replaced or pulled out, the bypass valve 3 is opened and released when the pressure is too high, and is opened and slurry is replenished when the slurry loss is too much; during drilling, construction is carried out from bottom to top, and the horizontal drilling platform is gradually increased and erected.

S5, after drilling to the designed depth, firstly removing the middle pipe 6 and the front pipe 7, sealing the annular space of the orifice pipe 2 and the freezing pipe 9, welding and sealing the annular space of the orifice pipe 2 and the freezing pipe 9 through annular steel plates, and then opening and filling the bypass valve 3 to prevent the freezing pipe 9 from displacing and prevent muddy water from entering.

In the first embodiment, as shown in fig. 1 and 3, at least four reinforcing points are distributed on the outer wall of the orifice pipe 2, and each reinforcing point is connected with an expansion screw 5 on the tunnel face 1 through a connecting steel plate 4.

As shown in FIG. 1, in the first embodiment, the valve is a ball valve; as shown in fig. 3, in the second embodiment, a gate valve is used as the valve.

In the invention, the freezing pipe 9 is used as a drill rod, the front end of the first section of freezing pipe 9 is closed, and the freezing pipe 9 passes through the front pipe 7 in a sealing way through the annular sealing mechanism 8, so that slurry leakage during drilling is avoided, the pollution of slurry leakage to the site is reduced, the cost of slurry treatment and outward transportation is reduced, and the water consumption during drilling is reduced; in the drilling process, the valve is closed when the freezing pipe 9 needs to be replaced or pulled out, so that the water burst phenomenon is avoided; in the drilling process, the bypass valve 3 is opened to release when the pressure is overlarge, and is opened and slurry is replenished when the slurry is excessively lost, so that the water inlet and outlet amount can be controlled, the water inlet and outlet amount is prevented from being unbalanced, the damage to the finished freezing hole due to the overlarge pressure is avoided, and the stratum sedimentation due to the excessive loss is also avoided; in the invention, the freezing pipe 9 is used as a drill rod, so that the cost is saved and the construction period is shortened.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.