A shallow tunnel large pipe shed and pipe drilling and grouting integrated construction method

Abstract

The application discloses a shallow-buried tunnel large pipe shed and pipe collecting drilling and grouting integrated construction method, and belongs to the technical field of tunnel construction. The method comprises the following steps: 1, releasing a pipe shed hole opening position and marking; 2, performing drilling operation and installing a pipe shed; 3, continuing drilling operation, and driving the pipe shed to follow; 4, repeating the steps 2-3 until the design depth requirement is reached; 5, after the hole cleaning operation is completed, directly grouting by using a drill rod. The application combines the drilling and grouting processes, improves the construction efficiency, and improves the stability of the pipe shed structure; based on the structural design of the bearing rolling mechanism, the mechanical friction between the existing pipe shoe and the drill rod due to the socket type connection is changed into rolling friction, the friction resistance can be greatly reduced, the loss between the parts can be reduced, and the drilling depth of the drill rod is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tunnel construction, and particularly relates to a shallow-buried tunnel large pipe shed follow-up pipe drilling and grouting integrated construction method. BACKGROUND

[0002] In the current tunnel construction, most of the tunnel entrance and exit hole sections have complex geology, shallow burial depth, poor integrity and stability of surrounding rock, and are mostly V-class surrounding rock, and the advanced large pipe shed support is generally used.

[0003] In the existing advanced large pipe shed support construction process, due to the complex geological conditions, the large pipe shed drilling is difficult to form a hole, and problems such as water gushing, drill sticking and hole collapse often occur, so the conventional construction process of "drilling - hole forming - hole cleaning - pipe installation" is changed to the large pipe shed follow-up pipe construction process, that is, drilling, hole cleaning and pipe installation are simultaneously constructed to solve the problem of hole forming difficulty; but due to the phenomena of drill sticking and hole collapse, the follow-up pipe technology drives the follow-up of the pipe shed steel pipe through the connection of the drill rod and the pipe shoe, which leads to serious wear of the follow-up pipe shoe, and the pipe shoe cannot be replaced, thereby affecting the drilling depth, and the drilling and grouting are separately operated in this process, which leads to slow work efficiency. SUMMARY

[0004] In view of the above problems existing in the prior art, the purpose of the present application is to provide a shallow-buried tunnel large pipe shed follow-up pipe drilling and grouting integrated construction method, which can ensure that the pipe shed drilling effectively reaches the designed depth and increases the construction efficiency on the basis of completing the drilling and grouting integrated construction in combination with the bearing rolling mechanism.

[0005] The present application provides the following technical solutions:

[0006] A shallow-buried tunnel large pipe shed follow-up pipe drilling and grouting integrated construction method comprises the following steps:

[0007] Step 1, the follow-up pipe shed hole opening position is placed on the guide wall and marked;

[0008] Step 2, after the drilling machine is installed and debugged normally, drilling operation is performed, and after drilling to the preset distance according to the design requirements, the follow-up pipe shed is installed, the follow-up pipe shed is connected with the pipe shoe arranged on the outer side of the front end of the drill rod, and the bearing rolling mechanism is arranged between the front end of the drill rod and the pipe shoe to reduce the friction force therebetween;

[0009] Step 3, after the follow-up pipe shed is installed, drilling operation is continued, and the follow-up pipe shed is driven to follow up while drilling;

[0010] Step 4, the procedures of steps 2-3 are repeated until the design depth requirement is reached;

[0011] Step 5, after the hole cleaning operation is completed, the drill rod is directly used for grouting;

[0012] Step 6, when the exhaust hole flows out the slurry, the exhaust hole is closed to continue grouting, and the grouting is stopped after the designed grouting amount is reached, and the grouting plug is installed at the head of the pipe roof.

[0013] Further, the bearing rolling mechanism comprises a bearing base, a group of rollers arranged on the bearing base, and a thrust washer; the bearing base is installed on the drill pipe.

[0014] Further, the outer sidewall of the bearing base is in a outer conical structure, the inner sidewall of the thrust washer is in an inner conical structure matched with the outer conical structure; the group of rollers is located between the outer sidewall of the bearing base and the inner sidewall of the thrust washer and is movably arranged on the outer sidewall of the bearing base.

[0015] Further, the inner side of the pipe shoe is provided with a limiting structure for limiting the thrust washer.

[0016] Further, the rear end of the pipe roof is provided with a pipe plug for exhausting and preventing the slurry from leaking out.

[0017] Further, the pipe plug is provided with a sealing element, which is tightly arranged between the outer sidewall of the drill pipe.

[0018] Further, a gap is left between the inner sidewall of the pipe roof and the outer sidewall of the drill pipe, the pipe plug is provided with an exhaust hole, and the exhaust hole is in a through hole structure and is in communication with the gap.

[0019] Further, the drill pipe is provided with a grouting channel in the inside, a grouting port at the rear end, and a slurry outlet at the front end.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows:

[0021] The present application combines the drilling and grouting processes, improves the construction efficiency, and improves the stability of the pipe roof structure; based on the structural design of the bearing rolling mechanism, the rolling friction structure formed by the bearing base, the rollers and the thrust washer is used to change the mechanical friction between the existing pipe shoe and the drill pipe due to the socket connection into rolling friction, which can greatly reduce the friction resistance, reduce the wear between the parts, and improve the drilling depth of the drill pipe; in addition, the bearing rolling mechanism can be taken out with the drill pipe to realize the reuse of the parts. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 The flowchart of the method of the present application is shown in the figure;

[0023] Fig. 2 The assembly structure diagram of the drill pipe, the pipe shoe, the pipe roof and the bearing rolling mechanism in the embodiment of the present application is shown in the figure;

[0024] Fig. 3 For the embodiment of the present application, the structural schematic diagram of the bearing rolling mechanism. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples of the present application. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0026] On the contrary, the present application covers any alternative, modification, equivalent method and scheme made on the essence and scope of the present application defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the following detailed description of the present application. The present application can also be completely understood without the description of these details for those skilled in the art.

[0027] Please refer to Figs. 1-3 A shallow tunnel large pipe shed and pipe drilling and grouting integrated construction method, comprising the following steps:

[0028] Step 1, the pipe shed 4 hole position is put on the guide wall, and is marked with red paint;

[0029] Step 2, after the drilling machine is installed and debugged normally, drilling operation is carried out, high-pressure air drives the drill bit 2 to generate impact force, and the drill rod 1 is driven into the soil body; after drilling a certain distance, the pipe shed 4 is installed; when the pipe shed 4 is installed, the pipe shed 4 and the pipe shoe 3 arranged on the outer side of the front end of the drill rod 1 are connected by screw threads, and a bearing rolling mechanism 5 is arranged between the front end of the drill rod 1 and the pipe shoe 3 to reduce the friction force between them; the drill bit 2 at the front end of the drill rod 1 penetrates the pipe shoe 3 of the pipe shed 4.

[0030] Step 3, after the pipe shed 4 is installed, drilling operation is continued, and the pipe shed 4 is driven to follow while drilling;

[0031] Step 4, repeat the procedures of steps 2-3 until the design depth requirement is reached;

[0032] Step 5, after the hole cleaning operation is completed, the drill rod 1 is directly grouted, the slurry is injected from the grouting port 10 and output from the slurry outlet 11; as the grouting proceeds, the drill rod 1 gradually withdraws;

[0033] Step 6, when the slurry flows out of the exhaust hole 13, close the exhaust hole 13 and continue grouting, stop grouting when the design grouting amount is reached, and install a grout stopper at the head of the pipe shed 4.

[0034] Specifically, the bearing rolling mechanism 5 includes a bearing base 7, a set of rollers 8, and a thrust washer 9; the bearing base 7 has an internal thread 6, which is screwed onto the drill rod 1 through a threaded connection structure; the outer side wall of the bearing base 7 and the inner side wall of the thrust washer 9 are a matching conical curved surface structure; the set of rollers 8 are evenly distributed between the outer side wall of the bearing base 7 and the inner side wall of the thrust washer 9, and are movably set on the outer side wall of the bearing base 7; the bearing base 7, the set of rollers 8, and the thrust washer 9 are combined to form a rolling friction mechanism.

[0035] Specifically, a pipe plug 12 is provided at the rear end of the pipe shed 4 for venting and preventing slurry leakage; the main body of the pipe plug 12 is threadedly installed on the pipe shed 4, and a sealing element is fixedly installed inside the main body.

[0036] Specifically, there is a gap between the inner wall of the pipe shed 4 and the outer wall of the drill rod 1, and the pipe plug 12 is provided with an exhaust hole 13. The exhaust hole 13 is a through hole structure and is connected to the gap.

[0037] Specifically, the drill rod 1 has a grouting channel inside, a grouting port 10 at the rear end for grouting input, and a grouting outlet 11 at the front end for grout output.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for integrated drilling and grouting construction of large pipe sheds and pipe collection systems in shallow-buried tunnels, characterized in that... Includes the following steps: Step 1: Mark the position of the pipe roof opening on the guide wall; Step 2: After the drilling rig is installed and debugged normally, drilling operation is carried out. According to the design requirements, after drilling to the preset distance, the follow pipe roof is installed. The follow pipe roof is connected to the pipe shoe set on the outside of the front end of the drill rod. A bearing rolling mechanism is set between the front end of the drill rod and the pipe shoe to reduce the friction between the two. Step 3: After the pipe and pipe shed are installed, continue drilling, and drive the pipe and pipe shed forward while drilling. Step 4: Repeat steps 2-3 until the design depth requirement is met; Step 5: After the hole cleaning operation is completed, grout is injected directly using the drill rod; Step 6: After the grout flows out of the vent hole, close the vent hole and continue grouting. Grouting can only be stopped after the designed grouting volume is reached, and a grout stop plug is installed at the head of the pipe roof. The bearing rolling mechanism includes a bearing base, a set of rollers and thrust washers mounted on the bearing base; the rear end of the follow-tube roof is provided with a pipe plug for venting and preventing grout leakage; the bearing base is mounted on the drill rod; a gap is left between the inner wall of the follow-tube roof and the outer wall of the drill rod, and the pipe plug is provided with a vent hole, which is a through hole structure and is connected to the gap; the drill rod is provided with a grouting channel inside, a grouting port is provided at the rear end of the drill rod, and a grout outlet is provided at the front end.

2. The integrated construction method for drilling and grouting of a large pipe shed and pipe manifold in a shallow-buried tunnel according to claim 1, characterized in that... The outer wall of the bearing base is an outer conical structure, and the inner wall of the thrust pad is an inner conical structure that matches the outer conical structure; a set of rollers is located between the outer wall of the bearing base and the inner wall of the thrust pad and is movably mounted on the outer wall of the bearing base.

3. The integrated construction method for drilling and grouting of a large pipe shed and pipe manifold in a shallow-buried tunnel according to claim 2, characterized in that... The inner side of the tube shoe is provided with a limiting structure for limiting the thrust pad.

4. The integrated construction method for drilling and grouting of large pipe sheds and pipe collection systems in shallow-buried tunnels according to claim 3, characterized in that... The plug is equipped with a sealing element, which is tightly fitted against the outer wall of the drill pipe.

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