CN210003293U - A protection device that encorbelments for protecting open hole stability on curved wall - Google Patents
A protection device that encorbelments for protecting open hole stability on curved wall Download PDFInfo
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- CN210003293U CN210003293U CN201920777954.1U CN201920777954U CN210003293U CN 210003293 U CN210003293 U CN 210003293U CN 201920777954 U CN201920777954 U CN 201920777954U CN 210003293 U CN210003293 U CN 210003293U
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Abstract
The application belongs to the field of tunnel engineering, and provides overhanging protection devices for protecting stability of holes in curved walls, which comprise expansion shell type hollow anchor rods, fixing devices and overhanging support steel plates, wherein the fixing devices are arranged in horizontal holes of tunnels above the hole-opening areas of the curved walls, the overhanging support steel plates penetrate through the fixing devices and are pushed into soil layers, the expansion shell type hollow anchor rods penetrate through the fixing devices and the overhanging support steel plates and are respectively anchored into primary tunnel lining and secondary tunnel lining of tunnel structures, and force transfer devices are formed among the fixing devices, the overhanging support steel plates and the tunnel structures.
Description
Technical Field
The utility model belongs to the tunnel engineering field, concretely relates to protection devices of encorbelmenting that are used for protecting to open hole stability on the curved wall.
Background
With the rapid development of urban subway construction, the tunnel construction is usually performed under the condition that another tunnels are constructed in the existing tunnel by digging a hole, the risk of the tunnel structure is smaller in the process of digging the hole under the condition that the side of the tunnel is a straight wall, the risk of the tunnel structure is smaller in the condition that the side of the tunnel is a curved wall, the curved wall is in an arc shape, the soil body above the curved wall has the supporting function of , the soil body above the curved wall is inevitably collapsed downwards under the action of gravity in the process of digging the hole, on the aspect of , collapsed soil needs to be cleaned to ensure the continuous operation of the digging construction, on the aspect of , the rigidity of the tunnel structure is weakened in the process of digging the hole, and the safety risk of the tunnel structure is greatly increased under the gravity of the soil body above the curved wall, therefore, overhanging protection devices for protecting the stability of the dug hole on the curved wall are designed, and have practical value for solving the engineering.
Disclosure of Invention
The purpose of this application is, overcome prior art's not enough, provides kinds of protection device that encorbelments for protecting the stability of the last hole of curved wall.
In order to achieve the purpose, the following technical scheme is adopted in the application:
overhanging protection devices for protecting the stability of holes in curved walls, which comprise shell-expanding hollow anchor rods, fixing devices and overhanging support steel plates;
the fixing device is arranged in a horizontal hole of a tunnel above a curved wall opening area, the cantilever support steel plate penetrates through the fixing device to be jacked into a soil layer, and the expansion shell type hollow anchor rod penetrates through the fixing device and the cantilever support steel plate to be respectively anchored into a primary tunnel lining and a secondary tunnel lining of a tunnel structure, so that force transmission devices are formed among the fixing device, the cantilever support steel plate and the tunnel structure.
Step , the fixing device comprises locking block bodies, protruding block bodies and enclosure plates, wherein the two locking block bodies are opposite left and right, the two enclosure plates are opposite front and back, and the four enclosure plates are connected end to form frames which are communicated up and down;
the cantilever support steel plate comprises a steel plate; the left side and the right side of the steel plate are respectively provided with a steel plate groove which is longitudinally communicated and is matched with the convex block in the fixing device, and the steel plate is also provided with a steel plate hole corresponding to the hole position of the apron plate;
the fixing device is arranged in a horizontal hole of the tunnel above a curved wall opening area, the cantilever support steel plate penetrates through the fixing device and is pushed into a soil layer, a steel plate groove of the cantilever support steel plate is matched and nested with a convex block in the fixing device, and a hole of a containment plate on the fixing device corresponds to a hole of a steel plate hole on the cantilever support steel plate;
the shell expansion type hollow anchor rod penetrates through the hole of the containment plate and the hole of the steel plate and is respectively anchored into the primary tunnel lining and the secondary tunnel lining of the tunnel structure, so that force transfer devices are formed among the fixing device, the cantilever support steel plate and the tunnel structure.
In the present application, the expanding hollow anchor rod is the one known in the art. And after the expansion shell type hollow anchor rod is installed, the interior of the vertical hole is subjected to pressure grouting through the grouting pipe so as to prevent the anchor rod from losing efficacy due to corrosion of the rod body of the anchor rod body.
In this application, fixing device provides the support for encorbelmenting the support steel sheet through protrusion block, steel sheet recess.
In this application, the shell-expanding type hollow anchor rod is anchored into the tunnel structure through the apron plate hole and the steel plate hole, and the soil pressure portion born by the fixing device and the overhanging support steel plate is transmitted to the tunnel lining structure above.
In this application, the size and quantity of the expanding-shell type hollow anchor rod, the fixing device and the cantilever support steel plate can be adjusted according to the size of a hole opening area, the geometric shape of a tunnel, the size of borne soil pressure and the like.
Compared with the prior art, the cantilever protection device for the curved wall opening has the advantages that the problem that the tunnel overlying soil body is short of support in the opening process is solved, an existing tunnel structure is used as a support point to provide a support effect for a cantilever support steel plate, and the cantilever support device is convenient to install and operate.
The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clear and clear, and to implement the technical solutions according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.
Drawings
Fig. 1 is a schematic installation diagram of an overhanging protection device for protecting the stability of a hole formed in a curved wall according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an expanding-shell type hollow anchor rod provided by the embodiment of the application;
FIG. 3 is a schematic structural diagram of a fixing device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural view of an overhanging support steel plate provided in the embodiment of the present application;
fig. 5 is a schematic view of a tunnel opening hole provided in an embodiment of the present application.
The reference numerals include: the method comprises the following steps of 1, tunnel center line 2, tunnel primary lining 3, tunnel secondary lining 3, curved wall opening area 4, tunnel hole 5, shell expansion type hollow anchor rod 6, fixing device 7 and cantilever support steel plate 8;
5-1 horizontal holes, 5-2 vertical holes and 5-3 secondary tunnel lining chiseling parts;
6-1 anchor head, 6-2 anchor rod body, 6-3 grout stop plug, 6-4 backing plate, 6-5 grouting pipe and 6-6 nut;
7-1 locking block, 7-2 projecting block, 7-3 enclosure plate and 7-4 enclosure plate holes;
8-1 steel plate holes, 8-2 steel plates and 8-3 steel plate grooves.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application , rather than all embodiments.
Referring to fig. 1-4, the present application provides technical solutions:
as shown in figure 1, overhanging protection devices for protecting the stability of a hole formed in a curved wall comprise an expanding shell type hollow anchor rod 6, a fixing device 7 and an overhanging support steel plate 8.
In the embodiment, expanding shell type hollow anchor rods disclosed in CN1544798A can be adopted as the expanding shell type hollow anchor rod 6, as shown in fig. 2, the expanding shell type hollow anchor rod 6 comprises an anchor head 6-1, an anchor rod body 6-2, a grout stop plug 6-3, a backing plate 6-4, a grouting pipe 6-5 and a nut 6-6, wherein the front end of the anchor rod body 6-2 is connected with the tail end of the anchor head 6-1 through a thread, a communication port communicated with the inner cavity of the anchor rod body 6-2 is formed in the anchor head 6-1, circular holes are formed in the grout stop plug 6-3, the backing plate 6-4 and the nut 6-6 so that the anchor rod body 6-2 can conveniently pass through, the backing plate 6-4 is provided with a small hole capable of being inserted into the grouting pipe 6-5, the grouting pipe 6-5 passes through the small hole in the backing plate 6-4 and is connected with the backing plate 6-4 through a welding mode, and the expanding shell type hollow anchor rod 6 is used for providing an anchoring effect and transferring part of pressure borne on the fixing device 7 and the cantilever steel.
As shown in FIG. 3, the fixing device 7 comprises locking block bodies 7-1, protruding block bodies 7-2 and enclosure plates 7-3, wherein the locking block bodies 7-1 and the protruding block bodies 7-2 are made of steel plates, the locking block bodies 7-1 are thick steel plates, the two locking block bodies 7-1 are arranged left and right oppositely, the two enclosure plates 7-3 are arranged front and back oppositely, the four are connected end to form rectangular frames which are communicated up and down, the sides opposite to the two locking block bodies 7-1 are respectively and vertically connected with protruding block bodies 7-2, the protruding block bodies 7-2 are parallel to the enclosure plates 7-3, the middle positions of the upper parts of the enclosure plates 7-3 are respectively provided with left and right enclosure plate holes 7-4, and the enclosure plate holes 7-4 on the two enclosure plates 7-3 are respectively corresponding to the hole positions.
As shown in fig. 4, the cantilever support steel plate 8 includes a steel plate 8-2; the left side and the right side of the steel plate 8-2 are respectively provided with a steel plate groove 8-3 which is longitudinally communicated and matched with the convex block 7-2 in the fixing device 7, and the middle position of the upper part of the steel plate 8-2 is provided with a left steel plate hole 8-1 and a right steel plate hole 8-1.
In the application, the steel plate groove 8-3 of the cantilever support steel plate 8 is matched with the convex block 7-2 in the fixing device 7 to form force-bearing force-transmission mechanisms, so that the fixing device 7 can provide support for the cantilever support steel plate 8, part of soil pressure borne on the steel plate 8-2 is transmitted to the fixing device 7, and then the part of soil pressure is transmitted to the tunnel structure below the fixing device 7 through the locking block 7-1 in the fixing device 7 and the apron plate 7-3.
As shown in fig. 5, the tunnel structure includes a primary tunnel lining 2 and a secondary tunnel lining 3, a curved wall opening area 4 is arranged on the side of the tunnel structure , before the cantilever protection device is installed, a hole needs to be formed above the curved wall opening area 4 to form a tunnel hole 5, and the tunnel hole 5 includes a horizontal hole 5-1, a vertical hole 5-2, a horizontal hole 5-1, and a secondary tunnel lining cutting part 5-3 below the vertical hole 5-2.
The application provides a protection device that encorbelments for protecting open hole stability on curved wall, the installation as follows:
(1) firstly, a drilling machine is used for forming a horizontal hole 5-1 above a curved wall opening area 4 along the horizontal direction, then a tunnel secondary lining part below the horizontal hole 5-1 is removed by chiseling, and finally a vertical hole 5-2 is drilled along the vertical direction.
(2) The fixing device 7 is placed in the horizontal hole 5-1 of the tunnel, and if necessary, the auxiliary installation can be carried out through a jacking device.
(3) The stress is applied through a jack or a hydraulic device, the overhanging supporting steel plate 8 is jacked into a soil layer above the curved wall opening area 4 through the horizontal hole 5-1 and is inserted into the fixing device 7, so that the steel plate groove 8-3 of the overhanging supporting steel plate 8 is matched and nested with the convex block 7-2 in the fixing device 7, and the hole 7-4 of the apron board reserved on the fixing device 7 corresponds to the hole of the steel plate hole 8-1 reserved on the overhanging supporting steel plate 8.
(4) An expansion shell type hollow anchor rod 6 is installed through a fixing device 7, a containment plate hole 7-4 reserved on an overhanging support steel plate 8 and a steel plate hole 8-1;
firstly, inserting an anchor rod body 6-2 provided with an anchor head 6-1 from the bottom of a vertical hole 5-2, sequentially penetrating through a hole 7-4 of a containment plate and a hole 8-1 of a steel plate, enabling the top end of the anchor head 6-1 to be attached to the inner top of the vertical hole 5-2, and enabling the anchor head 6-1 to be fully expanded;
and then sequentially sleeving a grout stop plug 6-3, a backing plate 6-4 with a grouting pipe 6-5 and a nut 6-6 into the lower part of the anchor rod body 6-2 from the lower parts of a fixing device 7 and a cantilever support steel plate 8, and connecting the nut 6-6 with a conventional tensioning tool, such as a torque wrench and an anchor rod tension meter, so as to carry out prestress tensioning to a specified value.
(5) After the expanding-shell type hollow anchor rod 6 is installed, a grouting machine is started to perform pressure grouting into the vertical hole 5-2 through a grouting pipe 6-5 installed on a backing plate 6-4, slurry gradually overflows the vertical hole 5-2 and flows upwards, the slurry enters the cavity of the hollow anchor rod body 6-2 from a communication port in the tail end of the anchor head 6-1 until the slurry flows out of the tail end of the anchor rod body 6-2 and the grouting pressure reaches a designed value, and grouting is stopped to complete anchor rod installation.
The purpose of grouting is to make the slurry wrap the prestressed anchor rod body, so as to effectively prevent the rod body from being corroded to cause the failure of the anchor rod.
The expanding shell type hollow anchor rod 6 is anchored into the primary tunnel lining 2 and the secondary tunnel lining 3 through the hole 7-4 of the enclosure plate and the hole 8-1 of the steel plate, so that force transfer devices can be formed among the fixing device 7, the overhanging support steel plate 8 and the tunnel structure.
At the moment, soil mass below the overhanging protection device collapses downwards along with the process of opening the hole and is excavated out in the process of opening the hole, gravity of the soil mass above the overhanging protection device is borne by the overhanging protection device, part of soil pressure is transmitted to the tunnel lining structure below the fixing device 7 through the fixing device 7, part of soil pressure is transmitted to the tunnel lining structure above the fixing device 7 through the expanding type hollow anchor rod 6, and finally the soil pressure is borne by the tunnel structure.
It should be noted that only cantilever support steel plates 8 are adopted in the above embodiment, so the cantilever protection device is single span, in the actual engineering, the distribution distance and number of the expanding shell type hollow anchor rods 6, the size and number of the fixing devices 7 and the cantilever support steel plates 8, and the like can be determined according to the difference of the size of the curved wall opening area 4, the tunnel geometry, the soil pressure born by the cantilever support steel plates 8, and the like, that is, in the actual engineering, the form of a multi-span cantilever protection device can be adopted, that is, a plurality of cantilever support steel plates 8 are continuously arranged along the direction of the small horizontal hole 5 of the tunnel, and the corresponding expanding shell type hollow anchor rods 6 and the fixing devices 7 are also continuously distributed along with the cantilever support steel plates 8.
The foregoing is a preferred embodiment of the present application, and those skilled in the art will appreciate that various changes, modifications, substitutions and alterations can be made in the embodiment without departing from the spirit and scope of the application.
Claims (3)
1, overhanging protection devices for protecting the stability of a hole formed in a curved wall, which are characterized by comprising an expansion shell type hollow anchor rod (6), a fixing device (7) and an overhanging support steel plate (8);
fixing device (7) are installed in the tunnel horizontal hole of bent wall open hole region top, and during cantilever support steel sheet (8) passed fixing device (7) and pushed into the soil layer, the shell-expanding type hollow stock passed fixing device (7) and cantilever support steel sheet (8) and anchored respectively in tunnel primary lining and tunnel secondary lining of tunnel structure for constitute force transfer devices between fixing device (7), cantilever support steel sheet (8) and the tunnel structure.
2. The overhanging protection device for protecting the stability of the opening in the curved wall according to claim 1, wherein the fixing device (7) comprises locking block bodies (7-1), protruding block bodies (7-2) and enclosure plates (7-3), the two locking block bodies (7-1) are opposite left and right, the two enclosure plates (7-3) are opposite front and back, the four enclosure plates are connected end to form frames which are communicated up and down, the opposite sides of the two locking block bodies (7-1) are respectively and vertically connected with protruding block bodies (7-2), the protruding block bodies (7-2) are parallel to the enclosure plates (7-3), and enclosure plate holes (7-4) with opposite hole positions are respectively formed in the two enclosure plates (7-3);
the cantilever support steel plate (8) comprises a steel plate (8-2); the left side and the right side of the steel plate (8-2) are respectively provided with a steel plate groove (8-3) which is longitudinally communicated and is matched with the convex block (7-2) in the fixing device (7), and meanwhile, the steel plate (8-2) is also provided with a steel plate hole (8-1) corresponding to the hole position of the apron plate hole (7-4);
the fixing device (7) is arranged in a horizontal hole of the tunnel above a bent wall opening area, the cantilever support steel plate (8) penetrates through the fixing device (7) to be pushed into a soil layer, a steel plate groove (8-3) of the cantilever support steel plate (8) is matched and nested with a convex block (7-2) in the fixing device (7), and a containment plate hole (7-4) on the fixing device (7) corresponds to a hole position of a steel plate hole (8-1) on the cantilever support steel plate (8);
the expansion shell type hollow anchor rod (6) penetrates through the apron plate hole (7-4) and the steel plate hole (8-1) and is respectively anchored into the primary tunnel lining (2) and the secondary tunnel lining (3) of the tunnel structure, so that force transfer devices are formed among the fixing device (7), the cantilever support steel plate (8) and the tunnel structure.
3. The overhang protection device for protecting the stability of the cut on the curved wall according to claim 2, wherein after the expanding hollow anchor rod (6) is installed, the interior of the vertical hole (5-2) is pressure-grouted through the grouting pipe (6-5) to prevent the anchor rod from being failed due to corrosion of the anchor rod body (6-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920777954.1U CN210003293U (en) | 2019-05-28 | 2019-05-28 | A protection device that encorbelments for protecting open hole stability on curved wall |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920777954.1U CN210003293U (en) | 2019-05-28 | 2019-05-28 | A protection device that encorbelments for protecting open hole stability on curved wall |
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| CN210003293U true CN210003293U (en) | 2020-01-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412492A (en) * | 2020-11-30 | 2021-02-26 | 华侨大学 | Deformation control supporting structure for tunnel with ultra-large section |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412492A (en) * | 2020-11-30 | 2021-02-26 | 华侨大学 | Deformation control supporting structure for tunnel with ultra-large section |
| CN112412492B (en) * | 2020-11-30 | 2022-07-29 | 华侨大学 | Deformation control supporting structure for tunnel with ultra-large section |
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