Movable temporary supporting steel arch

Abstract

The utility model discloses a movable temporary supporting steel arch, and belongs to the technical field of tunnel construction. The temporary supporting steel arch frame comprises a front support and a rear support, the front support and the rear support are of the same structure and each comprise a steel arch frame body, the bottoms of the two ends of each steel arch frame body are connected with height adjusting assemblies, and the bottom of each height adjusting assembly is provided with a moving wheel; each height adjusting assembly comprises an adjusting screw rod mounted at the top of the corresponding moving wheel, a nut is in threaded connection with the adjusting screw rod, a sleeve is arranged above the nut, the adjusting screw rod is movably sleeved with the sleeve, and the sleeve is connected with the end of the steel arch frame body. The front support and the rear support are detachably connected through the fixing rings and the connecting ribs. Overall movement can be achieved through the moving wheels, meanwhile, the height of the steel arch frame body can be adjusted through the height adjusting assembly so that the steel arch frame body can be completely attached to a vault, and tunnel collapse can be avoided when the deformed steel arch frame is dismantled.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a movable temporary support steel arch. Background Art

[0002] When a collapse occurs at the heading face of a small-section tunnel, the steel arches near the heading face will gradually deform. After analysis, the material composition of the fault fracture zone revealed by the excavation is mainly carbonaceous shale, grayish-black, locally containing coal seams, soiling hands, being soft rock, easily softened when encountering water, with many mirrors and scratches distributed in the rock mass, and groundwater flowing out in a gush from the excavation face. The surrounding rock stability is extremely poor, and local block falling or overall collapse is likely to occur at the crown and side walls. The softened carbonaceous shale forms a sludge-like substance under the impact of water and spreads in the excavated tunnel section. Based on on-site investigation and analysis and preliminary exploration data, it is speculated that a large-scale fault zone will be encountered in front of the heading face. In view of the above phenomena, it is necessary to handle the collapse and strengthen the support for this section.

[0003] When strengthening the support, it is necessary to remove the deformed steel arches of the primary support one by one. When removing the deformed steel arches, it is necessary to set up temporary supports at the planned removal positions first and then the removal can be carried out to avoid tunnel collapse during the removal of the deformed steel arches. However, the existing tunnel support spacings are generally 0.6, 0.8, 1, and 1.2 meters. After a collapse occurs, the construction party generally re-drills temporary supports at the gaps of 0.6, 0.8, 1, and 1.2 meters. This kind of temporary support is constructed on-site, which takes a long time and there are certain safety risks during the construction process; moreover, this kind of temporary support cannot be moved and its height is not convenient to adjust arbitrarily, so it cannot be quickly adjusted according to the actual situation of the construction site during the construction process. Summary of the Invention

[0004] Aiming at the above problems, the utility model aims to provide a movable temporary support steel arch. The movable temporary support steel arch can be moved through moving wheels. At the same time, the height of the steel arch body can be adjusted through a height adjustment component, so that it can be completely attached to the crown, avoiding tunnel collapse during the removal of the deformed steel arch.

[0005] In order to achieve the above purpose, the technical solutions adopted by the utility model are as follows:

[0006] A movable temporary support steel arch includes a movable front support and a rear support. The front support and the rear support have the same structure, and the front support and the rear support are detachably connected.

[0007] Furthermore, the front support includes a steel arch body. Both ends of the bottom of the steel arch body are connected with height adjustment components, and moving wheels are arranged at the bottom of each height adjustment component.

[0008] Furthermore, the height adjustment assembly includes an adjustment screw installed on the top of the moving wheel. A nut is threadedly connected to the adjustment screw. A sleeve is provided above the nut. The sleeve is movably sleeved outside the adjustment screw, and the sleeve is connected to the end of the steel arch frame body.

[0009] Furthermore, fixing rings are provided on the rear side of the sleeve corresponding to the front support and on the front side of the sleeve corresponding to the rear support. Connecting ribs are provided between the two mutually corresponding fixing rings.

[0010] Furthermore, a scale ruler is provided on the adjustment screw.

[0011] The beneficial effects of the present utility model are as follows: Compared with the prior art, the improvements of the present utility model are as follows.

[0012] 1. In the present utility model, height adjustment assemblies are provided at both bottom ends of the steel arch frame body. By the mutual cooperation of the adjustment screw and the nut, the height of the nut can be adjusted, thereby lifting the corresponding sleeve upward, playing a role in adjusting the height of the steel arch frame body, enabling the steel arch frame body to be closely attached to the arch top, and improving the support effect.

[0013] 2. The temporary support steel arch frame in the present utility model is convenient to move through the moving wheels, and the front support and the rear support are connected by the connecting ribs, so that the entire temporary support steel arch frame can be moved as a whole; meanwhile, the connecting ribs can play a role in supporting and limiting in the horizontal direction between the front support and the rear support. When the tunnel settles, it will press down the steel arch frame body and the sleeve. Due to the large downward acting force during the settlement process, when the nut is subjected to a force greater than the connecting force between it and the adjustment screw, the nut will be pressed to move downward. The connecting ribs tightly connect the mutually corresponding sleeves of the front support and the rear support in the horizontal direction, which can play a role in horizontal direction limiting. Unless the two mutually corresponding sleeves on the front support and the rear support move downward simultaneously, it is very difficult for a single sleeve on a single front support or a single rear support to move downward alone, thereby playing a role in strengthening the support effect.

[0014] 3. The present utility model is provided with a scale ruler on the adjustment screw. By observing the scale ruler corresponding to the nut, the settlement situation of the tunnel arch top can be monitored in real time, avoiding the collapse of the tunnel during the removal of the deformed steel arch frame; if the settlement is too large during the normal support period, different types of steel can also be considered for re-support to avoid collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view of the structure of the temporary support steel arch frame of the present utility model.

[0016] Figure 2 It is a front view of the structure of the front support of the present utility model.

[0017] Figure 3 This is the top view of the corresponding positions of the front support and the rear support sleeves of the present utility model.

[0018] Wherein: 1 - steel arch frame body, 2 - moving wheels, 3 - adjusting screw, 301 - scale ruler, 4 - nut, 5 - sleeve, 6 - fixing ring, 7 - connecting rib, 100 - front support, 200 - rear support. Specific embodiments

[0019] In order to enable ordinary technicians in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Refer to the attached Figures 1-3 A movable temporary support steel arch frame shown, including a movable front support 100 and a rear support 200. The front support 100 and the rear support 200 have the same structure, and the front support 100 and the rear support 200 are detachably connected.

[0021] Specifically, taking the front support 100 as an example, the front support 100 includes a steel arch frame body 1. The steel arch frame body 1 adopts an I-beam structure. Height adjustment components for adjusting the height of the steel arch frame body 1 are connected to both bottom ends of the steel arch frame body 1. A moving wheel 2 is provided at the bottom of each height adjustment component. The entire front support 100 can be moved through the two moving wheels 2. The moving wheel 2 is a universal wheel with a brake and can be locked after moving to the required position.

[0022] More specifically, the height adjustment component includes an adjusting screw 3 installed on the top of the moving wheel 2. A nut 4 is threadedly connected to the adjusting screw 3. The nut 4 can rotate up and down on the adjusting screw 3. A sleeve 5 is provided above the nut 4. The sleeve 5 is movably sleeved outside the adjusting screw 3, and the top of the sleeve 5 is welded and fixed to the end of the steel arch frame body 1. In the present utility model, the adjusting screw 3 can adopt a spiral ribbed steel bar structure, and its outer sidewall can be threadedly engaged with the nut 4. The sleeve 5 uses a hollow steel pipe structure, and the inner diameter of the sleeve 5 is slightly larger than the outer diameter of the adjusting screw 3, so that the sleeve 5 can move up and down outside the adjusting screw 3. The nut 4 and the bottom of the sleeve 5 are not connected, and only through mutual contact can the nut 4 support the sleeve 5. When the nut 4 is rotated upward, the sleeve 5 will be correspondingly lifted upward, thereby adjusting the height between the sleeve 5 and the steel arch frame body 1.

[0023] It should be noted that when adjusting the height of the steel arch frame body 1 in the present utility model, the nuts 4 corresponding to the bottoms of both ends of the steel arch frame body 1 need to be adjusted simultaneously to avoid tilting of the steel arch frame body 1 during single-sided adjustment and jamming of the other side sleeve 5.

[0024] Optionally, in order to realize the connection between the front support 100 and the rear support 200, fixing rings 6 are welded and fixed on the rear side of the sleeve 5 corresponding to the front support 100 and the front side of the sleeve 5 corresponding to the rear support 200. The fixing rings 6 adopt a steel bar ring structure, and two mutually corresponding fixing rings 6 are connected by a connecting rib 7. Both ends of the connecting rib 7 adopt a bent structure and can be inserted into the fixing rings 6. By connecting the front support 100 and the rear support 200 through the connecting rib 7, the front support 100 and the rear support 200 can be regarded as a whole, and one person can move the front support 100 and the rear support 200 simultaneously at one time; at the same time, when the tunnel subsides, it will press down on the steel arch frame body 1 and the sleeve 5. Since the downward acting force during the subsidence process is relatively large, when the nut 4 is subjected to a force greater than the connection force between it and the adjusting screw 3, the nut 4 will be pressed to move downward. The connecting rib 7 tightly connects the mutually corresponding sleeves 5 of the front support 100 and the rear support 200 in the horizontal direction, which can play a role in horizontal direction limiting. Unless the two mutually corresponding sleeves 5 on the front support 100 and the rear support 200 move downward simultaneously, otherwise, it is very difficult for a single sleeve 5 on a single front support 100 or a single rear support 200 to move downward alone, thus playing a role in strengthening the support effect.

[0025] Preferably, the distance between the front support 100 and the rear support 200 is 50 cm. During actual construction, the distance between the front support 100 and the rear support 200 can be adjusted according to the lithological characteristics of the construction site and the tunnel cavity conditions.

[0026] Preferably, a scale ruler 301 is provided on the adjusting screw 3. By observing the scale ruler 301 corresponding to the nut 4, the settlement situation of the tunnel vault can be monitored in real time. Although the connecting rib 7 can play a role in strengthening the support effect, there may still be a phenomenon of small-scale settlement of the tunnel vault. At this time, the settlement situation can be judged by observing the scale ruler 301 corresponding to the nut 4.

[0027] The temporary support steel arch frame of the present utility model is used as a temporary support when there is a collapse at the heading face during tunnel construction, the steel arch frame near the heading face is deformed, and the deformed steel arch frame is removed. The specific operation process includes the following steps:

[0028] Step 1: A connecting rib 7 is arranged between the sleeves 5 corresponding to the front support 100 and the rear support 200, and both ends of the connecting rib 7 are inserted into the corresponding fixing rings 6;

[0029] Step 2: Move the front support 100 and the rear support 200 to the front of the deformed steel arch frame to be demolished through the moving wheel 2, and remove the connecting bar 7;

[0030] Step 3: Move the front support 100 and the rear support 200 separately to the position where temporary support is required. Rotate the nut 4 to lift the sleeve 5 and the steel arch frame body 1 upward, and adjust the height of the steel arch frame body 1 to be closely attached to the vault;

[0031] Step 4: Finally, connect the connecting bar 7 between the sleeves 5 corresponding to the front support 100 and the rear support 200 to enhance the support effect;

[0032] Step 5: If the settlement of the tunnel vault occurs during the construction process, observe the scale ruler 301 corresponding to the nut 4 to monitor the settlement of the tunnel vault in real time.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A movable temporary support steel arch frame, characterized in that: It comprises a movable front support (100) and a rear support (200); the front support (100) and the rear support (200) have the same structure, and the front support (100) and the rear support (200) are detachably connected.

2. The movable temporary support steel arch according to claim 1 is characterized in that: The front support (100) comprises a steel arch frame body (1), the bottoms of both ends of the steel arch frame body (1) are connected to height adjustment components, and the bottom of each height adjustment component is provided with a moving wheel (2).

3. The movable temporary supporting steel arch frame according to claim 2 is characterized in that: The height adjustment assembly comprises an adjustment screw (3) mounted on the top of the moving wheel (2), a nut (4) being threadedly connected to the adjustment screw (3), a sleeve (5) being provided above the nut (4), the sleeve (5) being movably sleeved outside the adjustment screw (3), and the sleeve (5) being connected to the end of the steel arch frame body (1).

4. The movable temporary supporting steel arch frame according to claim 3 is characterized in that: A fixing ring (6) is provided on the rear side of the sleeve (5) corresponding to the front support (100) and the front side of the sleeve (5) corresponding to the rear support (200), and a connecting rib (7) is provided between the two corresponding fixing rings (6).

5. The movable temporary supporting steel arch frame according to claim 3 is characterized in that: The adjusting screw (3) is provided with a scale (301).

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