Arc arch intersection point structure for comprehensive mechanical construction and construction method

Abstract

The invention relates to the technical field of underground coal mine intersection point construction, in particular to an arc arch intersection point structure for comprehensive mechanical construction and a construction method. Comprising a main roadway; the transverse section intersects with the panel main roadway, and a transition section is arranged at the intersection; the transition section comprises a lower trumpet-shaped roadway, and the width of the lower trumpet-shaped roadway is gradually increased from the transverse section to the main roadway. The width of the upper arch-shaped roadway top is gradually increased from the transverse section to the main roadway, and the upper arch-shaped roadway top is arranged above the lower horn-shaped roadway; and the connecting roadway top is arranged between the main roadway and the upper arched roadway top.

Description

Technical Field

[0001] The invention relates to the technical field of intersection construction in underground coal mines, and in particular to a circular arc arch intersection structure and a construction method of a comprehensive mechanized construction. Background Art

[0002] In order to improve the tunneling efficiency, the underground coal mine mainly adopts comprehensive mechanized tunneling. The cross section of the main tunnel in the panel area can be semicircular arch, circular arch, rectangular, etc.

[0003] When the coal body is unstable, the semi-circular arch and circular arch are poorly formed in the coal body, and the arch should be arranged in the rock layer. In order to balance the excavation efficiency (amount of gangue cut) and the roof stability (the arch section has better roof stability than the rectangular section), the main tunnel in the pan area should adopt a circular arch shape, and the construction of the intersection of the circular arch in the main tunnel in the pan area is inevitable.

[0004] In various national and industry specifications and standards, arch intersections are mostly designed with a "bull nose" design, mainly blasting and manual construction. Rectangular cross-section intersections are mostly constructed with pre-locking support and mechanized construction of corners. There are no reference standards and related information for the comprehensive mechanized construction of circular arc arch intersections.

[0005] When the prior art tunnel boring machine turns a horizontal river, the intersection area is adjusted to a rectangular cross-section because the arc arch intersection cannot be constructed on site. However, the intersection is a stress concentration area, and the use of a rectangular cross-section is not conducive to roof control. Summary of the invention

[0006] In order to solve the problem that the arc arch cross section is adjusted to a rectangular cross section in the intersection area by adopting a comprehensive mechanized process, which is not conducive to top plate control, the present invention provides a circular arc arch intersection structure and a construction method for comprehensive mechanized construction.

[0007] The present invention adopts the following technical scheme: a circular arc arch intersection structure with comprehensive mechanized construction, comprising: Main lane; Hengchuan, Hengchuan intersects with the main lane of the panel area, and a transition section is set at the intersection; The transition section comprises: A lower trumpet-shaped laneway, wherein the width of the lower trumpet-shaped laneway gradually increases from the horizontal river to the main laneway; An upper arched roadway roof, wherein the width of the upper arched roadway roof gradually increases from the horizontal river to the main roadway, and the upper arched roadway roof is arranged above the lower trumpet-shaped roadway; A connecting tunnel roof is arranged between the main tunnel and the upper arched tunnel roof.

[0008] In some embodiments, the top of the connecting tunnel takes the intersection of the center line of the panel area main tunnel and the center line of the horizontal river as the starting point, and takes the highest points of the two intersection lines of the main tunnel and the lower trumpet-shaped tunnel as the two end points. The starting point and the two end points form two intersecting lines along the upper arch of the main tunnel, and an arc-shaped connecting tunnel top is formed between the two intersecting lines.

[0009] In some embodiments, the width of the main tunnel at the junction with the transition section is 9.5 meters.

[0010] A construction method of a circular arc arch intersection structure with comprehensive mechanized construction, comprising: S1: Determine the maximum height of the main tunnel, cross section and transition section; S2: Adjust the cutting thickness and the roadway height according to the determined maximum height; S3: Carry out the construction of the connecting roadway top on the main roadway. During the construction process, gradually adjust the thickness of the gangue and the roadway height of the connecting roadway top and its lower construction, and complete the construction of the area to be cut in place at one time; S4: Construction transition section, gradually transitioning from a width of 9.5 meters to a normal section width.

[0011] In step S1, the maximum height is wall height + 9.5 / rise-span ratio, in meters.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a design and construction method for a circular arc-shaped intersection of comprehensive mechanized construction. On the basis of using comprehensive mechanized construction, the stress structure of the circular arc-shaped tunnel at the intersection is improved, which is more conducive to the management of the tunnel roof.

[0013] 2. During the main tunnel excavation process, the thickness of the cut gangue and the tunnel height are adjusted in advance, and the top area to be cut is constructed in place at one time. This avoids the second top selection, simplifies the construction process, reduces the number of processes, reduces the construction difficulty, improves the excavation efficiency, enhances the safety guarantee capability, reduces material waste, and at the same time, the roof support is more regular and beautiful, which is convenient for the construction of the lock anchor cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The 3D model 1 of the arc arch intersection of the present invention; Figure 2 This is the 3D model 2 of the arc arch intersection of the present invention; Figure 3 This is the third 3D model of the arc arch intersection of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] In order to better understand the structure, construction method and advantages of the present invention, the comprehensive mechanized construction method of a circular arc arch intersection of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0017] like Figures 1 to 3 As shown, a 3D model was drawn by CAD to simulate the intersection of the arc arch of the main tunnel in the panel area: assuming that the turning opening section is selected to be 9.5 meters (to meet the turning excavation needs of the EBZ160 unit), three different intersection models were drawn using CAD.

[0018] Model 1: The opening side of the panel area's main tunnel opening transitions to a rectangle, while the other side remains an arc arch. During the turning process, the middle of the horizontal river is a flat section, while both sides are arc arches, gradually transitioning to a normal section.

[0019] Model 2: The main tunnel in the panel area intersects with the circular arch of the normal section of the horizontal river, and the corners are constructed as a rectangle.

[0020] Model 3: During the Yokogawa turning process, the size of the circular arch changes with the width of the tunnel, and the circular arch with an open section intersects with the main tunnel in the panel area.

[0021] Analysis of the model of the intersection of the main lane of the panel area and the circular arch of Hengchuan: Compared with the original rectangular intersection of the main lane of the panel area and Hengchuan, the cross section of Model 1 has been greatly adjusted, and the construction of the Hengchuan opening is also relatively simple, but the top of the middle of the intersection is still a flat section, which is still not conducive to the management of the roof. Model 2 has a triangular flat section at the corner of the opening, which is umbrella-shaped, and is also not conducive to the management of the roof. At the same time, the two circular arches intersect, and the construction difficulty of the Hengchuan opening increases. Model 3 also has two circular arches intersecting, and the construction difficulty of the Hengchuan opening increases, but the stability of the top plate at the intersection is better.

[0022] Analogy analysis table of the intersection model of the arc arch at the turn of the main lane in the panel area After comparative analysis, model three was selected as the optimal solution.

[0023] like Figure 3 As shown, a circular arch intersection structure with comprehensive mechanized construction includes: Main Lane 1; Hengchuan 2, Hengchuan 2 intersects with the main tunnel 1 in the panel area, and a transition section 3 is set at the intersection; The transition section 3 comprises: A lower trumpet-shaped lane 3.1, wherein the width of the lower trumpet-shaped lane 3.1 gradually increases from the horizontal river 2 to the main lane 1; An upper arched roadway roof 3.2, wherein the width of the upper arched roadway roof 3.2 gradually increases from the horizontal river 2 to the main roadway 1, and the upper arched roadway roof 3.2 is arranged above the lower trumpet-shaped roadway 3.1; A connecting tunnel roof 4 is arranged between the main tunnel 1 and the upper arched tunnel roof 3.2.

[0024] The connecting tunnel top 4 takes the intersection of the center line of the panel area main tunnel 1 and the center line of the horizontal river 2 as the starting point 5, and takes the highest points of the two intersection lines of the main tunnel 1 and the lower trumpet-shaped tunnel 3.1 as the two end points 6. The starting point 5 and the two end points 6 form two intersecting lines 7 along the upper arch of the main tunnel 1, and the two intersecting lines 7 form an arc-shaped connecting tunnel top 4.

[0025] The width of the connection between the main tunnel 1 and the transition section 3 is 9.5 meters.

[0026] Definition: If the main tunnel of the panel area turns into a horizontal river, the main tunnel of the panel area is called the main tunnel, and the horizontal river is called the tunnel to be turned. The arc arch of the opening section extends to the main tunnel, and there is an extra area to be cut at the top of the opening side of the main tunnel, so as to ensure that the comprehensive excavation unit can smoothly turn from the main tunnel to the tunnel to be turned.

[0027] A construction method of a circular arc arch intersection structure with comprehensive mechanized construction, comprising: S1: Determine the maximum height of the main tunnel 1, the horizontal section 2 and the transition section 3; The width of the turning opening is selected as 9.5 meters (to meet the needs of turning and excavation of the EBZ160 unit), the width of the turning corner section is gradually transitioned from 9.5 meters to 5 meters (or 5.5 meters, 5.8 meters) of the normal section, the arch height of the transition section is selected as 1 / 4 of the width (cutting thickness, the cutting thickness can be adjusted when the coal body is stable), and the wall height is selected as the wall height of the tunnel after the turn.

[0028] In step S1, the maximum height is wall height + 9.5 / rise-span ratio, in meters.

[0029] The main lane turns to the horizontal river, the wall height is 2.5 meters + the maximum span is 9.5 meters / 4 (arch height: 1 / 4 span ratio) = 4.875 meters; At the belt lane at Yokogawa, the wall height is 2.5 meters + the maximum span is 9.5 meters / 4=4.875 meters; Hengchuan turns back to the wind lane, the wall height is 3.1 meters + the maximum span is 9.5 meters / 4=5.475 meters; At Hengchuan turn into Fuyun Lane, the wall height is 3.28 meters + maximum span is 9.5 meters / 4=5.655 meters.

[0030] S2: Adjust the cutting thickness and the roadway height according to the determined maximum height; The width of the opening section is 9.5 meters, and the corresponding arch height (cutting thickness, the cutting thickness can be adjusted when the coal body is stable) is larger than the main tunnel. In order to ensure the stability of the opening arch, the main tunnel needs to be adjusted to ensure the cutting thickness.

[0031] S3: Carry out construction of the main tunnel 1 connecting the tunnel top 4. During the construction process, gradually adjust the thickness of the gangue connected to the tunnel top 4 and the tunnel height below it, and complete the construction of the area to be cut in place at one time; S4: Construction of transition section 3, gradually transitioning from a width of 9.5 meters to a normal section width.

[0032] The waiting lane will gradually transition to a normal section during the process of turning and rounding: When the main lane is completed, the waiting lane will gradually transition from an open section of 9.5 meters wide to a normal section of 5.0 meters (or 5.5 meters, 5.8 meters) wide. During the process of turning and rounding, the arch height will decrease synchronously with the decrease in width, and finally reach a normal section.

[0033] According to the construction site, the rock properties and stability of the tunnel roof, adjust the height of the arc arch at the intersection (the thickness of the cut gangue), appropriately reduce the rise-span ratio, reduce the amount of cut gangue, and improve the excavation efficiency.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circular arc arch intersection structure with comprehensive mechanized construction, characterized in that: include; Main lane (1); A horizontal stream (2), the horizontal stream (2) intersects with the panel area main tunnel (1), and a transition section (3) is provided at the intersection; The transition section (3) comprises: A lower trumpet-shaped laneway (3.1), wherein the width of the lower trumpet-shaped laneway (3.1) gradually increases from the horizontal river (2) to the main laneway (1); An upper arched roadway roof (3.2), wherein the width of the upper arched roadway roof (3.2) gradually increases from the horizontal river (2) to the main roadway (1), and the upper arched roadway roof (3.2) is arranged above the lower trumpet-shaped roadway (3.1); A connecting tunnel roof (4), wherein the connecting tunnel roof (4) is arranged between the main tunnel (1) and the upper arched tunnel roof (3.2).

2. The arc-arch intersection structure of comprehensive mechanized construction according to claim 1 is characterized in that: The connecting tunnel top (4) has the intersection of the center line of the panel area main tunnel (1) and the center line of the horizontal river (2) as the starting point (5), and the highest points of the two intersection lines of the main tunnel (1) and the lower trumpet-shaped tunnel (3.1) as the two end points (6). The starting point (5) and the two end points (6) form two intersecting lines (7) along the upper arch of the main tunnel (1), and the two intersecting lines (7) form an arc-shaped connecting tunnel top (4).

3. The arc-arch intersection structure of comprehensive mechanized construction according to claim 2 is characterized in that: The width of the connection between the main tunnel (1) and the transition section (3) is 9.5 meters.

4. A construction method of a circular arc arch intersection structure with comprehensive mechanized construction as claimed in claim 3, characterized in that: include: S1: Determine the maximum height of the main tunnel (1), the cross section (2) and the transition section (3); S2: Adjust the cutting thickness and the roadway height according to the determined maximum height; S3: Construction is performed on the main tunnel (1) to connect the tunnel top (4). During the construction process, the thickness of the cut gangue and the tunnel height of the tunnel top (4) and its lower part are gradually adjusted, and the area to be cut is constructed in place at one time; S4: Construction of transition section (3), gradually transitioning from 9.5m width to normal section width.

5. The arc-arch intersection structure of comprehensive mechanized construction according to claim 4 is characterized in that: In step S1, the maximum height is wall height + 9.5 / rise-span ratio, in meters.

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