阅读说明：本技术 暗挖隧道转弯处格栅支护的安装定位方法 (mounting and positioning method for grid support at turning position of underground excavation tunnel ) 是由 侯海林 张景武 杨金鑫 张成龙 张伟 范志坚 何增株 于 2019-10-11 设计创作，主要内容包括：本发明提供了一种暗挖隧道转弯处格栅支护的安装定位方法,通过以穿洞线和同步里程点为基准,通过“第一实际距离、第二实际距离、第三实际距离和第四实际距离”对实际隧道中的格栅支护的进行快速安装定位。本发明解决了隧道转弯段的钢格栅初支结构的快速安装的问题。(The invention provides an installation and positioning method of a grid support at a turning position of an underground excavated tunnel. The invention solves the problem of quick installation of the steel grating primary support structure of the tunnel turning section.)

1. A mounting and positioning method for a grid support at a turning position of an underground excavated tunnel is characterized by comprising the following steps of:

Drawing a layout plan of the grid supports at the turning positions of the tunnel, and marking connecting lines on the left side and the right side of each grid support on the layout plan;

Making a perforated line between the grid supports on the left side and the right side of the tunnel in the arrangement plan, wherein the perforated line and the connecting line are intersected at a focus, and respectively calculating a first actual distance and a second actual distance from the left side and the right side of each grid support to the focus;

Setting a first synchronous mileage point on a grid support on the left side of a tunnel in the arrangement plan, setting a second synchronous mileage point on a grid support on the right side of the tunnel in the arrangement plan, and respectively calculating a third actual distance from the left side of each grid support to the first synchronous mileage point and a fourth actual distance from the right side of each grid support to the second synchronous mileage point based on the radian of the turning part;

In an actual tunnel, positioning and paying off the perforated line and positioning and marking the first synchronous mileage point and the second synchronous mileage point in the actual tunnel based on the layout plan;

And determining the actual installation angle of each roof truss by taking the perforated line, the first synchronous mileage point and the second synchronous mileage point which are positioned and released in the actual tunnel as reference based on the first actual distance, the second actual distance, the third actual distance and the fourth actual distance of each roof truss.

2. the method of claim 1, wherein the through-hole line is positioned and deployed in the actual tunnel using a total station based on the deployment plan.

3. The method for installing and positioning the grid supports at the turns of the underground tunnel according to claim 1, wherein the step of determining the actual installation angle of each grid support comprises:

placing the left side and the right side of the first truss of the grid support at a first synchronous mileage point and a second synchronous mileage point in the actual tunnel;

Adjusting an angle between a connecting line of the left side and the right side of the first-truss grid support and the positioning and releasing perforation line, so that the distance from the left side and the right side of the first-truss grid support to an actual focus point where the connecting line intersects with the positioning and releasing perforation line is respectively equal to a first actual distance and a second actual distance of the first-truss grid support;

Pouring a section of arc primary support structure by taking the first truss after the angle is adjusted as a framework;

Respectively extending a third actual distance and a fourth actual distance of a rear grate support forwards along a structural surface of a previous section of the arc primary support structure by taking a first synchronous mileage point and a second synchronous mileage point in the actual tunnel as starting points, and placing the left side and the right side of the rear grate support at the third actual distance and the fourth actual distance;

and adjusting the angle between a connecting line of the left side and the right side of the rear-roof-truss support and the positioning-released perforation line, so that the distance from the left side and the right side of the rear-roof-truss support to an actual focus point where the connecting line and the positioning-released perforation line intersect is respectively equal to a first actual distance and a second actual distance of the rear-roof-truss support.

Technical Field

The invention relates to the technical field of tunnel construction, in particular to a mounting and positioning method for a grid support at a turning position of an underground excavated tunnel.

Background

In recent years, the construction of urban underground space engineering is rapidly developed, in order to meet the requirement of convenient and rapid station transfer by bus for people, transfer channels are usually arranged between new and old subway stations for personnel to transfer, and due to the position relation of the new and old subway stations, part of the transfer channels need to adopt an extremely small turning radius during the design so as to meet the effective connection transfer between the new and old subway stations.

The construction of the transfer passage generally adopts a structure form of a subsurface tunnel, the primary support structure is a steel grating, the positions of all gratings in the small-radius turning section are changed relative to the central axis of the tunnel, the distances from all gratings to the central line of the tunnel are inconsistent, the mounting and positioning of the gratings in the turning section cannot be carried out in a non-turning laser direction instrument mode, difficulty coefficients are increased for mounting and positioning the gratings in the small-radius turning tunnel, if a total station is adopted for mounting and positioning in the whole tunnel grating erection process, a large amount of manpower, material resources and time are wasted, great difficulty is increased for construction, and the construction efficiency is greatly reduced.

Disclosure of Invention

In order to overcome the defects in the prior art, the method for installing and positioning the grid support at the turning part of the underground excavated tunnel is provided so as to solve the problem of quick installation of the primary support structure of the steel grid at the turning part of the tunnel.

in order to realize the aim, the method for installing and positioning the grid support at the turning part of the underground excavated tunnel comprises the following steps:

Drawing a layout plan of the grid supports at the turning positions of the tunnel, and marking connecting lines on the left side and the right side of each grid support on the layout plan;

Making a perforated line between the grid supports on the left side and the right side of the tunnel in the arrangement plan, wherein the perforated line and the connecting line are intersected at a focus, and respectively calculating a first actual distance and a second actual distance from the left side and the right side of each grid support to the focus;

Setting a first synchronous mileage point on a grid support on the left side of a tunnel in the arrangement plan, setting a second synchronous mileage point on a grid support on the right side of the tunnel in the arrangement plan, and respectively calculating a third actual distance from the left side of each grid support to the first synchronous mileage point and a fourth actual distance from the right side of each grid support to the second synchronous mileage point based on the radian of the turning part;

In an actual tunnel, positioning and paying off the perforated line and positioning and marking the first synchronous mileage point and the second synchronous mileage point in the actual tunnel based on the layout plan;

And determining the actual installation angle of each roof truss by taking the perforated line, the first synchronous mileage point and the second synchronous mileage point which are positioned and released in the actual tunnel as reference based on the first actual distance, the second actual distance, the third actual distance and the fourth actual distance of each roof truss.

Further, based on the layout plan, positioning and paying out the perforated line in the actual tunnel by using a total station.

Further, the step of determining an actual installation angle of each of the grid supports comprises:

placing the left side and the right side of the first truss of the grid support at a first synchronous mileage point and a second synchronous mileage point in the actual tunnel;

Adjusting an angle between a connecting line of the left side and the right side of the first-truss grid support and the positioning and releasing perforation line, so that the distance from the left side and the right side of the first-truss grid support to an actual focus point where the connecting line intersects with the positioning and releasing perforation line is respectively equal to a first actual distance and a second actual distance of the first-truss grid support;

Pouring a section of arc primary support structure by taking the first truss after the angle is adjusted as a framework;

Respectively extending a third actual distance and a fourth actual distance of a rear grate support forwards along a structural surface of a previous section of the arc primary support structure by taking a first synchronous mileage point and a second synchronous mileage point in the actual tunnel as starting points, and placing the left side and the right side of the rear grate support at the third actual distance and the fourth actual distance;

and adjusting the angle between a connecting line of the left side and the right side of the rear-roof-truss support and the positioning-released perforation line, so that the distance from the left side and the right side of the rear-roof-truss support to an actual focus point where the connecting line and the positioning-released perforation line intersect is respectively equal to a first actual distance and a second actual distance of the rear-roof-truss support.

The method for installing and positioning the grid supports at the turning positions of the underground tunnel has the advantages that a 'coordinate system' for quickly positioning each grid support is established by taking a perforation line and a synchronous mileage point as references, so that each grid support has unique coordinates in the 'coordinate system', namely a first actual distance, a second actual distance, a third actual distance and a fourth actual distance, the grid supports in the actual tunnel are quickly installed and positioned by the 'first actual distance, the second actual distance, the third actual distance and the fourth actual distance', the operation is simple and convenient, the installation and positioning are accurate, a total station is not needed each time, the time consumption is short, the time consumption for installation and positioning is short, and the installation and positioning process can be completed by 1 person.

Drawings

fig. 1 is a plan view showing the arrangement of a grid support at a turning of an underground tunnel according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a first actual distance and a second actual distance according to an embodiment of the present invention.

fig. 3 is a schematic diagram of a third actual distance and a fourth actual distance according to an embodiment of the present invention.

fig. 4 is a sectional view of an actual tunnel according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

fig. 1 is a plan view of arrangement of a grid support at a turning of an underground tunnel according to an embodiment of the present invention, fig. 2 is a schematic view of a first actual distance and a second actual distance according to the embodiment of the present invention, fig. 3 is a schematic view of a third actual distance and a fourth actual distance according to the embodiment of the present invention, and fig. 4 is a sectional view of an actual tunnel according to the embodiment of the present invention.

referring to fig. 1 to 4, the invention provides a mounting and positioning method for a grid support at a turning position of an underground excavation tunnel, which comprises the following steps:

S1: drawing a layout plan of the grid supports at the turning positions of the tunnel, and marking connecting lines 20 on the left side and the right side of each grid support 2 on the layout plan.

Referring to fig. 1, a plan view of the arrangement of the grid supports is drawn by the grid supports at the tunnel turning points in a top view. A connecting line 20 is formed by connecting the left and right sides of each grid support (the left side of the grid support is the inner side of the turn, and the right side of the grid support is the outer side of the turn) in the layout plan view.

s2: and (3) making a perforated line 3 between the grid supports 2 on the left side and the right side of the tunnel in the arrangement plan view, wherein the perforated line 3 and each connecting line 20 are intersected at a focus, and respectively calculating a first actual distance A and a second actual distance B from the left side and the right side of each grid support 2 to the focus.

A perforated line 3 is made between the grating supports 2 on the left and right sides of the tunnel in the layout plan view. The perforated line 3 and a connecting line 20 of each grid support intersect at a focus, and a first actual distance A and a second actual distance B from the left side and the right side of each grid support 2 to the focus are calculated respectively.

S3: and setting a first synchronous mileage point a on the grid support 2 on the left side of the tunnel in the arrangement plan view, setting a second synchronous mileage point b on the grid support 2 on the right side of the tunnel in the arrangement plan view, and respectively calculating a third actual distance C from the left side of each grid support 2 to the first synchronous mileage point a and a fourth actual distance D from the right side of each grid support 2 to the second synchronous mileage point b on the basis of the radian of a turning point.

A first synchronized mileage point a is provided on a grid support 2 on the left side (inner side) of a tunnel turn in the layout plan view, and a second synchronized mileage point b is provided on a grid support 2 on the right side (outer side) of the tunnel in the layout plan view. Referring to fig. 2, a connection line between the first and second synchronized mileage points is a synchronized mileage line E.

And respectively calculating a third actual distance C from the left side of each grid support 2 to the first synchronous mileage point a and a fourth actual distance D from the right side of each grid support 2 to the second synchronous mileage point b according to the designed radian of the turning part.

In this embodiment, the third actual distance C is the length of the inner side of the tunnel turn, and the third actual distance C is the length of the inner side arc of the tunnel turn, the fourth actual distance D is the length of the outer side of the tunnel turn, and the fourth actual distance D is the length of the outer side arc of the tunnel turn.

s4: in an actual tunnel, positioning and paying off a perforated line 3 based on a layout plan, and positioning and marking a first synchronous mileage point a and a second synchronous mileage point b in the actual tunnel.

Based on the layout plan, the perforated line 3 is positioned and paid out in the actual tunnel 4 using a total station. The perforation line can be projected on the vault and then led out downwards through a plurality of line plummets 6. The multiple line pendants (line pendants) are arranged along the length of the perforation line projected on the top, so that the cones at the bottoms of the multiple line pendants coincide with the perforation line 3' positioned and paid out in the actual tunnel.

and positioning and marking the first synchronous mileage point a and the second synchronous mileage point b on a side wall at the actual tunnel turning position.

s5: and determining the actual installation angle of each grid support 2 based on the first actual distance A, the second actual distance B, the third actual distance C and the fourth actual distance D of each grid support 2 by taking the perforated line 3' discharged at the position in the actual tunnel, the first synchronous mileage point a and the second synchronous mileage point B as references.

specifically, step S5 includes:

And S51, placing the left side and the right side of the first grid support at a first synchronous mileage point and a second synchronous mileage point in the actual tunnel.

In the present embodiment, since the synchronized mileage line is located at the No. 8 grid support, the No. 8 grid support is the first grid support.

Specifically, the left side of the first-frame grid support is placed at a first synchronous mileage point a in the actual tunnel, and the right side of the first-frame grid support is placed at a second synchronous mileage point b in the actual tunnel.

and S52, adjusting the angle between the connecting line of the left side and the right side of the first-pin grid support and the positioning and releasing perforation line, so that the distance from the left side and the right side of the first-pin grid support to the actual focus point of the intersection of the connecting line and the positioning and releasing perforation line is respectively equal to the first actual distance and the second actual distance of the first-pin grid support.

After the left side and the right side of the first-truss grid support are placed at a first synchronous mileage point and a second synchronous mileage point, adjusting the orientation angle (the angle formed by the grid support and the central axis of the tunnel) of the first-truss grid support to enable the distance from the left side of the first-truss grid support to the actual focus of the intersection of a connecting line (the connecting line between the left side and the right side of the first-truss grid support) and the perforation line 3' to be equal to the first actual distance of the first-truss grid support; and enabling the distance from the right side of the first-truss grating support to the actual focus to be equal to the second actual distance of the first-truss grating support.

and S53, pouring a section of arc primary support structure by taking the first-truss grid support with the angle adjusted as a framework.

and pouring a section of arc primary support structure by taking the first truss grid support with the well-adjusted orientation angle as a framework.

And S54, respectively extending a third actual distance and a fourth actual distance of the next grate support forward along the structural surface of the previous section of the arc primary support structure by taking the first synchronous mileage point and the second synchronous mileage point in the actual tunnel as starting points, and placing the left side and the right side of the next grate support at the third actual distance and the fourth actual distance.

Specifically, a first synchronous mileage point in the actual tunnel is taken as a starting point, a third actual distance of the next grate support is extended forwards along the arc-shaped structural surface on the left side of the previous arc-shaped primary support structure, and the left side of the next grate support is placed at the third actual distance; and taking a second synchronous mileage point in the actual tunnel as a starting point, extending a fourth actual distance of the next grate support forwards along the arc-shaped structure surface on the right side of the previous arc-shaped primary support structure, and placing the right side of the next grate support at the fourth actual distance.

And the third actual distance and the fourth actual distance of the later grid support are marked.

And S55, adjusting the angle between the connecting line of the left side and the right side of the rear grate support and the positioning and releasing perforation line, so that the distance from the left side and the right side of the rear grate support to the actual focus point of the intersection of the connecting line and the positioning and releasing perforation line is respectively equal to the first actual distance and the second actual distance of the rear grate support.

The principle of this step is the same as that of step S52, and the distances from the left and right sides of the latter one to the actual focal points where the connecting line intersects with the positioning-released perforated line 3' are made equal to the first and second actual distances of the latter one by adjusting the orientation angle of the latter one.

In this embodiment, a plurality of line weights are irradiated by a laser level, actual perforated lines 3' which are positioned and discharged are formed by pituitary bodies of the line weights, and the distance between the main bar of each grid support in the main bar connecting direction and the perforated line is measured by the connecting line 20 connecting the main bars on the same surface on the left and right sides of the grid support, thereby determining the left and right positions of the grid support when the grid support is installed. And measuring the distance between the grid support and the first synchronous mileage point and the distance between the grid support and the second synchronous mileage point through a meter ruler, and determining the orientation angle of the grid support, thereby completing the installation and positioning of the grid support.

According to the method for installing and positioning the grid supports at the turning positions of the underground tunnel, a 'coordinate system' for quickly positioning each grid support is established by taking the perforation lines and the synchronous mileage points as references, so that each grid support has unique coordinates in the 'coordinate system', namely a first actual distance, a second actual distance, a third actual distance and a fourth actual distance, and the grid supports in the actual tunnel are quickly installed and positioned through the 'first actual distance, the second actual distance, the third actual distance and the fourth actual distance', the method is simple and convenient to operate and accurate in installation and positioning, a total station is not required to be adopted each time, the consumed time is short, the consumed time for installation and positioning is short, and the installation and positioning process can be finished by 1 person.

it should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the invention is to be defined by the scope of the appended claims.