Space arrangement method of small curve segment shallow-buried excavation channel large pipe shed

Abstract

The application discloses a small curve segment shallow-buried excavation channel large pipe shed space arrangement method, relates to a circular arc channel with limited operation space at one end, and specifically comprises the following steps: S1, a guide frame is constructed at one end away from the arc channel to be excavated with limited operation space, and a casing pipe is pre-buried on the guide frame; S2, the guide frame and the casing pipe are fixed, and concrete is injected into the guide frame; S3, a down-the-hole drill is extended into the casing pipe and used for pipe following operation along the arrangement direction of each casing pipe; and S4, a reinforcing bar is installed into the pipe, a grouting joint is installed at the casing pipe end, a single-liquid slurry grouting machine is used, and the casing pipes are sequentially grouted to complete the large pipe shed construction; in the application, the limited site conditions are fully utilized, the small curve segment shallow-buried excavation channel large pipe shed is fully covered, the construction process is reduced, the construction efficiency is greatly improved, the cost investment is reduced, the construction period is reduced, and the shallow-buried excavation construction safety is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe roof construction, in particular to a large pipe roof space arrangement method for a shallow-buried excavation channel with a small curve section. BACKGROUND

[0002] Due to the large traffic flow of the urban main road, the construction site limitation, the complex pipeline and the necessity of adopting the excavation method for the metro wind pavilion channel section, the excavation section of the channel is a 1 / 4 circular ring type, and the overburden is about 4.5 m. Due to the influence of the curve on the channel, the previous construction experience adopts the arrangement method of the large pipe roof on both sides. The arrangement method of the large pipe roof on both sides has the disadvantages of complicated construction procedures, extremely low construction efficiency, high investment cost, serious lag in construction period and the like, and the channel is opposite to the existing metro operation line, so the large pipe roof construction cannot be implemented, which leads to the great safety risk of the excavation. SUMMARY

[0003] The main purpose of the present application is to provide a large pipe roof space arrangement method for a shallow-buried excavation channel with a small curve section, and to solve the existing technical problems.

[0004] In order to achieve the above-mentioned purpose, the present application provides a large pipe roof space arrangement method for a shallow-buried excavation channel with a small curve section, which relates to an arc-shaped channel with limited operation space at one end, and specifically includes the following steps,

[0005] S1: a guide frame is constructed away from the arc-shaped channel to be excavated at one end of the operation space limited, and a sleeve pipe is pre-buried on the guide frame in an equidistant distribution;

[0006] S2: the guide frame and the sleeve pipe are fixed, and the guide frame is injected with concrete;

[0007] S3: a down-the-hole drill is inserted into the sleeve pipe and follows the pipe along the arrangement direction of each sleeve pipe to perform the pipe following construction operation;

[0008] S4: a reinforcing bar is installed into the pipe following, a grouting joint is installed at the end of the sleeve pipe, a single-liquid slurry grouting machine is used to sequentially perform the grouting construction on the sleeve pipe, and the large pipe roof construction is completed.

[0009] Further, in S1, the equidistantly distributed sleeve pipes are composed of a horizontal section and an arc-shaped section, one end of the straight line where the end of the horizontal section sleeve pipe is located is connected with the upper end of the arc line where the end of the arc-shaped section sleeve pipe is located, the length of the straight line where the end of the horizontal section sleeve pipe is located is greater than one half of the width of the end face of the arc-shaped channel, the horizontal section sleeve pipe is distributed in a divergent direction from the insertion end to the extension end, the pipe following in the horizontal section sleeve pipe is arranged above the arc-shaped channel and is arranged in a line with the horizontal tangent line at the top of the arc, and the arc-shaped section sleeve pipe is longitudinally distributed along the end face of the arc-shaped channel. The equidistant distribution distances of the horizontal section sleeve pipe and the arc-shaped section sleeve pipe are different.

[0010] Further, in the S3, the end of each casing where the follow-up pipe construction is performed is arranged along the outer arc surface of the circular arc channel and the end surface with limited operation space, and at least three follow-up pipes in a diverging manner are arranged above the end surface with limited operation space of the circular arc channel, and the divergence angle between adjacent follow-up pipes is 2-3°.

[0011] Further, the casing is arranged at a pre-tilted angle, and the tilting angle is 1°, and the rear section of the front casing is arranged below the front section of the rear casing and partially overlaps.

[0012] Further, in the S4, a small leading pipe is arranged inside the guide frame along the outer side of the circular arc channel, the small leading pipe passes through the steel grating web arranged in advance, the rear end is supported on the steel grating arranged in advance and is welded firmly, the front end is embedded in the stratum in an inclined manner, the horizontal support overlap length of the front and rear rows of small leading pipes is greater than 1m, and grouting is sequentially injected into the small leading pipes of the same end face during the overlap process, the grouting is performed from bottom to top and symmetrically at intervals, and adjacent hole positions are staggered and crossed.

[0013] Further, the end of each small leading pipe arranged on the same end face in the circular arc channel is distributed towards the follow-up pipe arranged in the upper layer, the small leading pipe arranged near the inner arc surface in the circular arc channel is distributed in correspondence with the follow-up pipe arranged in a diverging manner in the upper layer, and the follow-up pipe is arranged in a diverging manner from the inner arc surface of the circular arc channel from top to bottom and from inside to outside.

[0014] Further, in the S4, the casing is grouted in a skip-hole manner, wherein the skip-hole interval of the grouting construction in the circular arc section casing is a single-hole interval, and the skip-hole interval of the grouting construction in the horizontal section casing is a double-hole interval.

[0015] Further, in the S4, during the subsequent circular arc channel excavation process, the stratum below the horizontal section casing which is distributed towards and in a diverging manner is pre-supported when the inner wall of the channel is constructed, the anchor bolt hole is reserved in advance on the inner wall and is covered and protected after the local channel inner wall shape is constructed, then the corresponding side of the circular arc channel inner wall is sprayed with concrete, and at least twice of the concrete pre-reinforcement operation is sequentially performed on each excavation surface.

[0016] Further, in the S4, the follow-up pipe left in the casing is a welded steel pipe or a seamless steel pipe, and cement mortar or a steel reinforcement cage is poured or placed in the follow-up pipe.

[0017] The beneficial effects of the present application are as follows:

[0018] The present application makes full use of the limited site conditions, solves the problems of difficult construction, complicated construction procedures, extremely low construction efficiency, high cost investment, serious lag in construction period and the like of the prior art of large pipe shed with curve section by using two end head construction, and solves the problem of the difficulty of implementing large pipe shed construction for the existing subway operation line on the opposite side of the passage; the design arrangement is simple and easy to implement, and makes full use of the limited space; the large pipe shed section adopts a horizontal + circular arc type design concept, a divergent arrangement is adopted on the plane, and a pre-inclination measure is adopted in the vertical direction; the design application ensures full coverage of the large pipe shed of the small curve section, reduces the construction procedures, greatly improves the construction efficiency, reduces the cost investment, reduces the construction period, and ensures the safety of the shallow-buried excavation construction. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the prior art of large pipe shed construction with curve section excavation;

[0020] Figure 2 It is a schematic diagram of the plane arrangement of the large pipe shed of the present application;

[0021] Figure 3 It is a schematic diagram of the section arrangement of the large pipe shed of the present application;

[0022] Figure 4 It is a schematic diagram of the longitudinal section of the large pipe shed of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] It should be noted that if the present application involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition and the like between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0025] The meaning of "and / or" appearing in the whole text includes three parallel schemes, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B scheme. In addition, "multiple" means more than two. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary technical personnel in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist.

[0026] Please refer to Figures 2-4 The small curve segment shallow excavation channel large pipe shed space arrangement method of the application relates to an arc-shaped channel with limited operation space at one end, and specifically comprises the following steps,

[0027] S1: a guide frame is constructed away from the end of the arc-shaped channel to be excavated with limited operation space, and a sleeve pipe is pre-buried on the guide frame;

[0028] S2: the guide frame and the sleeve pipe are fixed, and concrete is injected into the guide frame;

[0029] S3: a down-the-hole drill is inserted into the sleeve pipe and follows the pipe along the arrangement direction of each sleeve pipe to perform pipe-laying operation;

[0030] S4: steel bars are installed into the pipe-laying, a grouting joint is installed at the end of the sleeve pipe, a single-liquid slurry grouting machine is used to sequentially perform grouting construction on the sleeve pipe, and large pipe shed construction is completed.

[0031] Please refer to Figure 1 , fully utilizing the limited site conditions, the problems of large pipe shed construction of the previous curve segment excavation, such as large construction difficulty, many construction procedures, extremely low construction efficiency, high cost investment, serious lag in construction period, etc. are solved, and the difficult problem of large pipe shed construction cannot be implemented on the opposite side of the channel which is an existing subway operation line. The design arrangement method is simple and easy to implement, fully utilizes the limited space, and adopts a pre-inclination measure in the vertical direction. The small curve excavation segment large pipe shed is fully covered, the construction procedure is reduced, the construction efficiency is greatly improved, the cost investment is reduced, the construction period is reduced, and the safety of shallow excavation construction is ensured.

[0032] In an embodiment, in S1, the equidistantly distributed sleeve pipes are composed of a horizontal segment and a circular arc segment, one end of a straight line where the end of the horizontal segment sleeve pipe is located is connected with the upper end of an arc line where the end of the circular arc segment sleeve pipe is located, the length of the straight line where the end of the horizontal segment sleeve pipe is located is greater than one half of the width of the end face of the arc-shaped channel, the horizontal segment sleeve pipe is distributed in a diverging direction from the insertion end to the extension end, the pipe-laying in the horizontal segment sleeve pipe is located above the arc-shaped channel and is arranged in line with the horizontal tangent at the top of the arc, and the circular arc segment sleeve pipe is distributed longitudinally along the end face of the arc-shaped channel. In addition, the equidistant distribution distances of the horizontal segment sleeve pipe and the circular arc segment sleeve pipe are different.

[0033] In this way, the large pipe shed section is designed in a horizontal + circular arc type, and is arranged in a divergent manner, so that the pipe shed can be built from one end of the circular arc channel, that is, the pipe shed can be built from one end of the circular arc channel through the one-side divergent sleeve arrangement, so as to cover the whole circular arc channel, without punching the sleeve from both ends of the circular arc channel, so as to make full use of the limited site conditions, and solve the problems of the previous curved section of the large pipe shed, such as difficult construction, complex construction process, low construction efficiency, high cost, and serious delay of construction period.

[0034] In an embodiment, in the S3, the end of each sleeve for the pipe following construction is arranged along the outer arc surface of the circular arc channel and the end surface of the limited operation space, and at least three pipe following devices are arranged in a divergent manner above the end surface of the limited operation space of the circular arc channel, and the divergence angle between adjacent pipe following devices is 2-3°. In this way, the non-operation surface of the circular arc channel can be effectively pre-supported, so that the divergent sleeve can completely cover the whole circular arc channel, and when the two ends of the circular arc channel are penetrated, the non-operation surface of the circular arc channel will not collapse, and the safety of the construction is ensured.

[0035] In an embodiment, the sleeve is arranged at a pre-tilted angle, the tilting angle is 1°, and the rear section of the front sleeve is arranged below and partially overlaps the front section of the rear sleeve. In this way, the problem that the sleeve will sink into the interior of the circular arc channel during construction can be avoided, and a reasonable sinking distance is reserved in advance for the sleeve, so as to ensure the normal construction of the subsequent construction, and the construction efficiency is improved.

[0036] In an embodiment, after the S4, a small guide pipe is arranged on the outside of the circular arc channel along the inside of the guide frame and the arch contour line, the small guide pipe passes through the abdomen of the steel grid erected in advance, the rear end is supported on the steel grid erected, and is welded firmly, the front end is embedded in the stratum in an inclined manner, the horizontal support overlap length of the front and rear rows of small guide pipes is greater than 1m, and the small guide pipes are sequentially grouted into the small guide pipes of the same end face during the erection process, the grouting is performed from bottom to top and symmetrically, and the adjacent holes are staggered and crossed. In this way, the front section of the circular arc channel can be reinforced and supported, the upper stratum of the front circular arc channel to be constructed can be prevented from collapsing due to the distance between the support point of the sleeve and the inner surface of the channel, and the supporting effect of the large pipe shed is further improved.

[0037] In an embodiment, each of the leading small ducts at the end of the same end face in the circular-arc-shaped channel is arranged towards the follow-up ducts arranged in the upper layer, the leading small ducts arranged in the circular-arc-shaped channel near the inner-arc face are arranged in spaced correspondence with the follow-up ducts arranged in a diverging manner in the upper layer, and the follow-up ducts arranged in a diverging manner from the inner-arc face in the circular-arc-shaped channel are arranged from top to bottom and from inside to outside. In this way, through the corresponding arrangement of the leading small ducts, the front end of the circular-arc-shaped channel under construction can be pre-supported, and the follow-up ducts arranged in a diverging manner in the upper layer are arranged in spaced correspondence, thereby uniformly and multi-point pre-supporting the upper stratum where the circular-arc-shaped channel to be constructed on the front side is located, further improving the safety of subsequent construction, and guaranteeing the quality of construction.

[0038] In an embodiment, in the S4, the casing is subjected to grouting construction in a skip-hole manner, wherein the skip-hole interval of the grouting construction in the circular-arc-shaped section casing is a single-hole interval, and the skip-hole interval of the grouting construction in the horizontal section casing is a double-hole interval. The skip-hole grouting principle in sequence can effectively realize step-by-step constrained grouting, so that the slurry gradually reaches extrusion compaction, promotes the continuity of the grouting curtain, and through step-by-step increase of the grouting pressure, is conducive to the diffusion of the slurry and the denseness of the slurry stone body. At the same time, the grouting of the subsequent holes is also an inspection and evaluation of the grouting effect of the previous holes. Therefore, in principle, all grouting projects should adopt the skip-hole grouting principle.

[0039] In an embodiment, in the S4, during the excavation of the subsequent circular-arc-shaped channel, after each excavation, the stratum below the horizontal section casing arranged towards and in a diverging manner is pre-supported when the inner wall of the channel is constructed, the anchor bolt hole is reserved in advance on the inner wall and is covered and protected before the anchor rod is punched after the local shape of the inner wall at the construction site is constructed, then the concrete is sprayed to the inner wall of the corresponding side of the circular-arc-shaped channel, and at least twice of the concrete pre-reinforcement operation is sequentially performed on each excavation face. In this way, the support strength of the stratum below the horizontal section casing arranged in a diverging manner can be further improved, so as to avoid that the stratum between the casing arranged in a diverging manner and the circular-arc-shaped channel below cannot be effectively supported due to the diverging arrangement of the casing on this side, and if the stratum has a problem of low strength, local collapse of the stratum may occur when the circular-arc-shaped channel is constructed to this position, thereby affecting the construction progress.

[0040] In an embodiment, in the S4, the follow-up ducts left in the casing are welded steel pipes or seamless steel pipes, and cement mortar or steel reinforcement cages are poured or placed in the follow-up ducts. In this way, the structural strength of the casing as a whole can be improved, thereby improving the bearing capacity of the whole pipe shed and safety.

[0041] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for spatial arrangement of a small curve segment shallow tunneling passage large pipe shed, relates to a circular arc passage with limited operation space at one end, characterized in that: Specifically comprising the following steps, S1: constructing a guide frame at one end of the to-be-excavated arc-shaped passage away from the limited operation space, and pre-burying equidistantly distributed sleeves on the guide frame; S2: fixing the guide frame and the sleeves, and injecting concrete into the guide frame; S3: extending a down-the-hole drill into the sleeve and performing pipe-following construction along the arrangement direction of each sleeve; S4: installing reinforcing bars into the pipe-following construction, installing a grouting joint at the end of the sleeve, and using a single-liquid grouting machine to sequentially perform grouting construction on the sleeve to complete the large-pipe-shed construction. In the S1, the equidistantly distributed sleeves are composed of a horizontal section and a circular arc section, one end of the straight line where the end of the horizontal section sleeve is located is connected with the upper end of the arc line where the end of the circular arc section sleeve is located, and the length of the straight line where the end of the horizontal section sleeve is located is greater than one half of the width of the end face of the arc-shaped passage, the horizontal section sleeve is distributed in a diverging direction from the insertion end to the extension end, and the pipe-following construction in the horizontal section sleeve is arranged above the arc-shaped passage and collinear with the horizontal tangent at the top of the arc, and the circular arc section sleeve is longitudinally distributed along the end face of the arc-shaped passage, wherein the equidistant distribution distances of the horizontal section sleeve and the circular arc section sleeve are different.

2. The method according to claim 1, wherein: In the S3, the end of each sleeve where the pipe-following construction is performed is sequentially arranged along the outer arc face of the arc-shaped passage and the end face of the limited operation space, and at least three pipe-following constructions in a diverging manner are arranged above the end face of the arc-shaped passage of the limited operation space, and the diverging angle between adjacent pipe-following constructions is 2-3°.

3. The method according to claim 1, wherein the method is characterized in that: The sleeves are arranged at a pre-raised angle, the raising angle is 1°, and the rear section of the front sleeve is arranged below the front section of the rear sleeve and partially overlaps.

4. The method according to claim 1, wherein the method is characterized in that: After the S4, a leading small guide pipe is arranged outside the arch contour line of the arc-shaped passage on the inner side of the guide frame, the leading small guide pipe passes through the abdominal part of the steel grating erected in advance, the rear end is supported on the steel grating already erected and is firmly welded, the front end is embedded in the stratum in an inclined manner, the horizontal support overlap length of the front and rear rows of leading small guide pipes is greater than 1m, and grouting is sequentially injected into the leading small guide pipes on the same end face during the erection process, the grouting is performed from bottom to top and symmetrically at intervals, and adjacent hole positions are staggered and crossed.

5. The small-curve-segment shallow-buried tunnel large pipe roof space arrangement method according to claim 4, characterized in that: Each end of the leading small guide pipe arranged on the same end face in the arc-shaped passage is distributed towards the pipe-following construction arranged above, the leading small guide pipe arranged near the inner arc face in the arc-shaped passage is distributed in a diverging manner with the pipe-following construction arranged above, and the distribution is from top to bottom and from inside to outside along the inner arc face of the arc-shaped passage.

6. The method according to claim 1, wherein: In the S4, the sleeves are grouted by the hole skipping method, wherein the hole skipping interval for the grouting construction in the circular arc section sleeve is a single-hole interval, and the hole skipping interval for the grouting construction in the horizontal section sleeve is a double-hole interval.

7. The method according to claim 1, wherein the method is characterized by: In the S4, during the subsequent excavation of the arc-shaped passage, after each excavation, the stratum below the horizontally section sleeve distributed in a diverging manner towards the arc-shaped passage is pre-supported when the inner wall of the passage is constructed, after the local inner wall shape of the passage is constructed, anchor bolt holes are reserved on the inner wall in advance before the anchor rods are driven, and the anchor bolt holes are then covered and protected, and then concrete is sprayed on the inner wall of the arc-shaped passage on the corresponding side, and at least twice of the concrete pre-reinforcement operation is sequentially performed on each excavation face.

8. The method according to claim 1, wherein the method is characterized in that: In the S4, the casing pipe is welded steel pipe or seamless steel pipe, and the cement mortar or steel reinforcement cage is filled in the pipe.

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