A planar intersection method and structure of diversion tunnel and grouting tunnel

Abstract

The present invention discloses a planar intersection structure of a diversion tunnel and a grouting tunnel, comprising an upper grouting tunnel, a lower grouting tunnel, a diversion tunnel and a traffic tunnel, wherein the lower grouting tunnel is provided with an underpass section located below the diversion tunnel, the traffic tunnel passes through the diversion tunnel and the two ends of the traffic tunnel are respectively connected to the two ends of the underpass section, and the part of the traffic tunnel located in the diversion tunnel is a traffic corridor; the upper grouting tunnel is located above the diversion tunnel, and the elevation of the lower grouting tunnel is the same as that of the diversion tunnel. The planar intersection method and structure of the diversion tunnel and the grouting tunnel of the present invention improves the construction progress when the diversion tunnel and the grouting tunnel are in planar intersection, and reduces the construction period of the diversion tunnel plugging.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy projects, and in particular to a planar intersection method and structure of a diversion tunnel and a grouting tunnel. Background Technology

[0002] In water conservancy projects, diversion methods are generally divided into two basic methods, namely the full-section cofferdam method and the segmented cofferdam method. The basic feature of the full-section cofferdam method is that the main riverbed is blocked by the full-section cofferdam at one time, and the water flow is directed to the side discharge structure. The diversion tunnel is one of the commonly used discharge structures. Before the construction of the barrage dam, the diversion tunnel needs to be built and the water flow of the river channel is directed from the upstream river channel of the barrage dam to the downstream river channel of the barrage dam. Therefore, the overall direction of the diversion tunnel is parallel to the river channel. The barrage dam is a permanent water retaining structure of the water conservancy hub project. For the safety of the building itself and to prevent the water in the reservoir from leaking downstream through the dam foundation, an anti-seepage curtain grouting is often set under the dam foundation. The curtain grouting needs to be completed in the grouting tunnel. In order to prevent leakage around the dam, the curtain grouting and the grouting tunnel need to be extended to a certain length toward the mountain. The overall direction of the grouting tunnel is perpendicular to the river.

[0003] If the diversion tunnel parallel to the river and the grouting tunnel perpendicular to the river have the same or similar elevation, a plane intersection of the two tunnels is formed. When the diversion tunnel parallel to the river and the grouting tunnel perpendicular to the river intersect in parallel, the construction of the two tunnels will affect each other, greatly extending the construction period and slowing down the construction progress. How to properly handle the plane intersection of the diversion tunnel and the grouting tunnel is a difficult problem that needs to be solved urgently. SUMMARY OF THE INVENTION

[0004] The purpose of the present invention is to provide a method and structure for the plane intersection of a diversion tunnel and a grouting tunnel, so as to solve the problems existing in the above-mentioned prior art and improve the construction progress when the plane intersection of the diversion tunnel and the grouting tunnel occurs.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The present invention provides a planar intersection structure of a diversion tunnel and a grouting tunnel, comprising an upper grouting tunnel, a lower grouting tunnel, a diversion tunnel and a traffic tunnel, wherein the lower grouting tunnel is provided with an underpass section located below the diversion tunnel, the traffic tunnel passes through the diversion tunnel and the two ends of the traffic tunnel are respectively connected with the two ends of the underpass section, and the part of the traffic tunnel located in the diversion tunnel is a traffic corridor; the upper grouting tunnel is located above the diversion tunnel, and the elevation of the lower grouting tunnel is the same as that of the diversion tunnel.

[0007] Preferably, the upper grouting hole is provided with a first grouting curtain and a first drainage hole, the lower grouting hole is provided with a second grouting curtain, a third grouting curtain and a second drainage hole, and the third grouting curtain is horizontal.

[0008] Preferably, the underpass section is communicated with the traffic corridor through a third drainage hole, the third drainage hole is vertical, and the third drainage hole is communicated with the second drainage hole through a drain pipe.

[0009] Preferably, an annular grouting curtain is arranged around the diversion tunnel, and the first grouting curtain overlaps with the annular grouting curtain; the third grouting curtain horizontally overlaps with the bottom of the annular grouting curtain.

[0010] Preferably, the overlapping length of the first grouting curtain and the annular grouting curtain and the overlapping length of the third grouting curtain horizontally and the bottom of the annular grouting curtain are both ≥ 5m.

[0011] Preferably, the underpass section includes a first slope section, a horizontal section and a second slope section connected in sequence, and one ends of the first slope section and the second slope section far from the horizontal section are respectively communicated with the lower grouting tunnel.

[0012] Preferably, the distances between one ends of the first slope section and the second slope section far from the horizontal section and the diversion tunnel are both greater than or equal to the width of the diversion tunnel, and the slopes of the first slope section and the second slope section are both ≤ 45°.

[0013] The present invention also provides a method for the planar intersection of a diversion tunnel and a grouting tunnel based on the above-mentioned planar intersection structure of the diversion tunnel and the grouting tunnel, including the following steps:

[0014] (1) After the diversion tunnel is built, let the diversion tunnel pass water; the upper grouting tunnel is constructed to pass horizontally from above the diversion tunnel, and the lower grouting tunnel is constructed to pass through from below the diversion tunnel in an underpass manner;

[0015] (2) A first grouting curtain and a first drainage hole are arranged in the upper grouting tunnel, and a second grouting curtain, a third grouting curtain and a second drainage hole are arranged in the underpass grouting tunnel;

[0016] (3) During the plugging period of the diversion tunnel, a horizontal traffic tunnel is added to the underpass section of the lower grouting tunnel, the elevation of the traffic tunnel is the same as that of the lower grouting tunnel, and sections identical to the horizontal traffic tunnel of the grouting tunnel are cut on both side walls of the diversion tunnel to make the horizontal traffic tunnel pass through the diversion tunnel;

[0017] (4) Vertically drill a third drainage hole upward in the underpass section, the third drainage hole extends into the traffic tunnel, and connect the second drainage hole and the third drainage hole with a drain pipe;

[0018] (5) An annular grouting curtain is made around the diversion tunnel. The top curtain depth of the annular grouting curtain is 10-15m and extends into the first grouting curtain. The overlap length between the first grouting curtain and the annular grouting curtain is not less than 5m. The curtain depths of the side walls on both sides of the annular grouting curtain are 10-15m; the bottom curtain depth of the annular grouting curtain extends into the third grouting curtain. The overlap length between the annular grouting curtain and the third grouting curtain is not less than 5m;

[0019] (6) sealing the underpass grouting hole with concrete;

[0020] (7) The diversion tunnel is sealed with concrete; a traffic corridor is reserved in the sealing section of the diversion tunnel, the axis of the traffic corridor is consistent with the axis of the traffic tunnel, and the cross-section of the traffic corridor is the same as the cross-section of the horizontal traffic tunnel.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The plane intersection method and structure of the diversion tunnel and the grouting tunnel of the present invention improves the construction progress when the diversion tunnel and the grouting tunnel intersect in plane. During the operation of the diversion tunnel, the grouting tunnel is passed through below, which does not affect the construction progress of the grouting project. During the blocking period of the diversion tunnel, the intersection is remodeled and a traffic tunnel is added to horizontally pass through the diversion tunnel, which is beneficial to the drainage and traffic of the grouting tunnel during the operation period of the project. An annular curtain is set in the diversion tunnel to form a closed anti-seepage system. Brief Description of the Figures

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the plane intersection of the diversion tunnel and the grouting tunnel;

[0025] Figure 2 It is a structural schematic diagram of the planar intersection structure of the diversion tunnel and the grouting tunnel of the present invention;

[0026] Figure 3 For Figure 2 AA section view of ;

[0027] Figure 4 For Figure 2 BB section of ;

[0028] Figure 5 For​​Figure 4 Local enlarged view of point C in the middle;

[0029] Among them: 1- diversion tunnel, 101- diversion tunnel plugging, 2- grouting tunnel, 201- upper grouting tunnel, 202- lower grouting tunnel, 3- water flow, 4- first slope section, 5- horizontal section, 6- second slope section, 7- traffic tunnel, 8- traffic corridor, 9- end face, 10- first grouting curtain, 11- second grouting curtain, 12- third grouting curtain, 13- first drainage hole, 14- second drainage hole, 15- annular grouting curtain, 16- underpass section, 17- third drainage hole, 18- drainage pipe. Specific implementation method

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The purpose of the present invention is to provide a method and structure for the plane intersection of a diversion tunnel and a grouting tunnel, so as to solve the problems existing in the above-mentioned prior art and improve the construction progress when the plane intersection of the diversion tunnel and the grouting tunnel occurs.

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] If Figures 1 to 5 As shown: the plane intersection structure of the diversion tunnel and the grouting tunnel in this embodiment includes a grouting tunnel 2, a diversion tunnel 1 and a traffic tunnel 7. The grouting tunnel 2 includes an upper grouting tunnel 201 and a lower grouting tunnel 202. The lower grouting tunnel 202 is provided with an underpass section 16 located below the diversion tunnel 1. The traffic tunnel 7 passes through the diversion tunnel 1 and the two ends of the traffic tunnel 7 are respectively connected to the two ends of the underpass section 16. The part of the traffic tunnel 7 located in the diversion tunnel 1 is a traffic corridor 8; the upper grouting tunnel 201 is located above the diversion tunnel 1, and the elevation of the lower grouting tunnel 202 is the same as that of the diversion tunnel 1. The direction of the water flow 3 in the diversion tunnel 1 can be seen in Figure 1 .

[0034] The first grouting curtain 10 and the first drainage hole 13 are arranged in the upper grouting hole 201, and the second grouting curtain 11, the third grouting curtain 12 and the second drainage hole 14 are arranged in the lower grouting hole 2, and the third grouting curtain 12 is horizontal.

[0035] The underpass section 16 is connected to the traffic corridor 8 through the third drainage hole 17 . The third drainage hole 17 is vertical and is connected to the second drainage hole 14 through the drainage pipe 18 .​

[0036] A circular grouting curtain 15 is arranged around the diversion tunnel 1, the first grouting curtain 10 overlaps with the circular grouting curtain 15; the third grouting curtain 12 horizontally overlaps with the bottom of the circular grouting curtain 15.

[0037] The overlap length of the first grouting curtain 10 and the annular grouting curtain 15, and the overlap length of the third grouting curtain 12 and the bottom of the annular grouting curtain 15 are both ≥5m.

[0038] The underpass section 16 includes a first slope section 4, a horizontal section 5, and a second slope section 6 connected in sequence. The ends of the first slope section 4 and the second slope section 6 away from the horizontal section 5 are respectively connected to the lower grouting hole 202.

[0039] The distance between the end of the first slope section 4 and the second slope section 6 away from the horizontal section 5 and the diversion tunnel 1 is greater than or equal to the width of the diversion tunnel 1, and the slope of the first slope section 4 and the second slope section 6 is ≤45°.

[0040] The present invention also provides a planar intersection method of a diversion hole and a grouting hole based on the planar intersection structure of the diversion hole and the grouting hole, comprising the following steps:

[0041] (1) After the diversion tunnel 1 is built, water is passed through the diversion tunnel 1; the upper grouting hole 201 is constructed to pass horizontally from the upper part of the diversion tunnel 1, and the lower grouting hole 202 is constructed to pass from the lower part of the diversion tunnel 1 by means of a downward pass;

[0042] (2) A first grouting curtain 10 and a first drainage hole 13 are arranged in the upper grouting hole 201, and a second grouting curtain 11, a third grouting curtain 12 and a second drainage hole 14 are arranged in the lower grouting hole 2;

[0043] (3) Setting up diversion tunnel plugging 101. During the plugging period of diversion tunnel 1, a horizontal traffic tunnel 7 is added to the underpass section 16 of the lower grouting tunnel 202. The elevation of the traffic tunnel 7 is consistent with that of the lower grouting tunnel 202. The same section of the horizontal traffic tunnel 7 as that of the grouting tunnel 2 is excavated on both side walls of diversion tunnel 1, so that the horizontal traffic tunnel 7 passes through diversion tunnel 1;

[0044] (4) Drill a third drainage hole 17 vertically upward in the lower through section 16, the third drainage hole 17 extends into the traffic tunnel 7, and the second drainage hole 14 and the third drainage hole 17 are connected by a drainage pipe 18;

[0045] ​​(5) A circular grouting curtain 15 is constructed around the diversion tunnel 1. The depth of the top curtain of the circular grouting curtain 15 is 10 - 15 m and extends into the first grouting curtain 10. The overlapping length between the first grouting curtain 10 and the circular grouting curtain 15 is not less than 5 m. The depth of the curtain on both side walls of the circular grouting curtain 15 is 10 - 15 m. The depth of the bottom curtain of the circular grouting curtain 15 extends into the third grouting curtain 12, and the overlapping length between the circular grouting curtain 15 and the third grouting curtain 12 is not less than 5 m.

[0046] (6) Seal the grouting tunnel 2 passing through with concrete.

[0047] (7) Seal the diversion tunnel 1 with concrete. In the sealed section of the diversion tunnel 1, a traffic corridor 8 is reserved. The axis of the traffic corridor 8 is the same as that of the traffic tunnel 7, and the end face 9 of the traffic corridor 8 is the same as the cross-section of the horizontal traffic tunnel 7.

[0048] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "top", "bottom", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0049] In this specification, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. At the same time, for those of ordinary skill in the art, based on the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A planar intersection structure of a diversion hole and a grouting hole, characterized in that: It includes an upper grouting hole, a lower grouting hole, a diversion hole and a traffic hole. The lower grouting hole is provided with an underpass section below the diversion hole. The traffic hole passes through the diversion hole and the two ends of the traffic hole are respectively connected with the two ends of the underpass section. The part of the traffic hole located in the diversion hole is a traffic corridor. The upper grouting hole is located above the diversion hole, and the elevation of the lower grouting hole is the same as that of the diversion hole.

2. The planar intersection structure of the diversion hole and the grouting hole according to claim 1 is characterized in that: The upper grouting hole is provided with a first grouting curtain and a first drainage hole, the lower grouting hole is provided with a second grouting curtain, a third grouting curtain and a second drainage hole, and the third grouting curtain is horizontal.

3. The planar intersection structure of the diversion hole and the grouting hole according to claim 2 is characterized in that: The underpass section is connected to the traffic corridor through a third drainage hole, the third drainage hole is vertical, and the third drainage hole is connected to the second drainage hole through a drainage pipe.

4. The planar intersection structure of the diversion hole and the grouting hole according to claim 2 is characterized in that: An annular grouting curtain is arranged around the diversion hole, the first grouting curtain overlaps with the annular grouting curtain; the third grouting curtain overlaps with the bottom of the annular grouting curtain horizontally.

5. The planar intersection structure of the diversion hole and the grouting hole according to claim 4 is characterized in that: The overlapping length of the first grouting curtain and the annular grouting curtain, and the overlapping length of the third grouting curtain and the bottom of the annular grouting curtain are both ≥5m.

6. The planar intersection structure of the diversion hole and the grouting hole according to claim 1 is characterized in that: The underpass section includes a first slope section, a horizontal section, and a second slope section which are connected in sequence. One end of the first slope section and the second slope section away from the horizontal section are respectively connected to the lower grouting hole.

7. The planar intersection structure of the diversion hole and the grouting hole according to claim 6 is characterized in that: The distances between the ends of the first slope section and the second slope section away from the horizontal section and the diversion tunnel are both greater than or equal to the width of the diversion tunnel, and the slopes of the first slope section and the second slope section are both ≤45°.

8. A method for plane intersection of a diversion hole and a grouting hole based on the plane intersection structure of a diversion hole and a grouting hole according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) After the diversion tunnel is built, water is passed through the diversion tunnel; the upper grouting tunnel is constructed horizontally from the upper part of the diversion tunnel, and the lower grouting tunnel is constructed by passing through the lower part of the diversion tunnel; (2) a first grouting curtain and a first drainage hole are arranged in the upper grouting hole, and a second grouting curtain, a third grouting curtain and a second drainage hole are arranged in the lower grouting hole; (3) During the blocking period of the diversion tunnel, a horizontal traffic tunnel is added to the underpass section of the lower grouting tunnel. The elevation of the traffic tunnel is consistent with that of the lower grouting tunnel. The same cross-section as the horizontal traffic tunnel of the grouting tunnel is excavated on both side walls of the diversion tunnel so that the horizontal traffic tunnel passes through the diversion tunnel; (4) drilling a third drainage hole vertically upward in the down-through section, the third drainage hole extending into the traffic tunnel, and connecting the second drainage hole and the third drainage hole with a drainage pipe; (5) An annular grouting curtain is made around the diversion tunnel, the top of the annular grouting curtain has a curtain depth of 10-15m and extends into the first grouting curtain, the overlap length between the first grouting curtain and the annular grouting curtain is not less than 5m, and the curtain depths of the side walls on both sides of the annular grouting curtain are 10-15m; The bottom curtain of the annular grouting curtain extends into the third grouting curtain, and the overlapping length of the annular grouting curtain and the third grouting curtain is not less than 5m; (6) sealing the lower grouting hole with concrete; (7) The diversion tunnel is sealed with concrete; a traffic corridor is reserved in the sealed section of the diversion tunnel, the axis of the traffic corridor is consistent with the axis of the traffic tunnel, and the cross-section of the traffic corridor is the same as the cross-section of the horizontal traffic tunnel.

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