A mortar anchor support connection device and a support connection method

Abstract

The present invention proposes a mortar anchor support connection device, including an upper connecting plate, a lower connecting plate, a plurality of sleeves and a straight support rod; the sleeve can be sleeved on the outside of the mortar anchor, the upper connecting plate and the lower connecting plate are arranged in parallel up and down, the plurality of sleeves are respectively arranged on both sides of the upper connecting plate and the lower connecting plate, and the straight support rod is connected between every two upper and lower adjacent sleeves; wherein, the upper connecting plate and the lower connecting plate are respectively provided with connecting parts, and the tube wall of each sleeve is respectively provided with a screw hole, and a tightening screw is assembled in the screw hole. The present invention also proposes a mortar anchor support connection method, which is implemented by using the mortar anchor support connection device described above. The present invention does not require welding during connection, is convenient for construction, and ensures the timeliness of the initial tunnel steel support.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering, and in particular relates to a mortar anchor support connection device and a support connection method. Background Art

[0002] In the field of underground engineering, especially in the construction process of underground engineering such as tunnels, steel arch support is widely used as a fast and effective support measure in the initial support. As an important part of the steel arch support process, the locking foot anchor rod directly affects the quality and strength of the steel arch fixation effect. The existing locking foot anchor rod construction mostly uses L-shaped steel bars and mortar anchor rods to connect, or directly welds the exposed section of the mortar anchor rod to the steel arch rod. Since the initial excavation support of the tunnel often has high requirements for timeliness, the welding in the tunnel is often unable to guarantee the effectiveness of the welding quality and the timeliness of the support work due to the narrow working surface, poor ventilation and complicated welding process. At the same time, due to the relatively thin connection between the locking foot anchor rod and the steel support, the rigidity is often insufficient and there is a certain initial deformation, which results in the initial support effect of the steel support not being very good. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a mortar anchor support connection device and a support connection method, so as to overcome the above problems or at least partially solve or alleviate the above problems.

[0004] The present invention proposes a mortar anchor support connection device, comprising an upper connecting plate, a lower connecting plate, a plurality of sleeves and a straight support rod, wherein the sleeve can be sleeved on the outside of the mortar anchor; the upper connecting plate and the lower connecting plate are arranged in parallel up and down, the plurality of sleeves are respectively arranged on both sides of the upper connecting plate and on both sides of the lower connecting plate, and the straight support rod is connected between every two upper and lower adjacent sleeves; wherein the upper connecting plate and the lower connecting plate are respectively provided with connecting parts, and a screw hole is respectively provided on the tube wall of each sleeve, and a tightening screw is assembled in the screw hole.

[0005] The present invention also has the following optional features.

[0006] Optionally, the upper connecting plate and the lower connecting plate are both rectangular plates, the number of the straight support rods is four, and the four straight support rods are distributed in a rectangular array.

[0007] Optionally, it further comprises an oblique brace, one end of which is connected to the sleeve on one side of the upper connecting plate, and the other end of which is connected to the sleeve on the other side of the lower connecting plate.

[0008] Optionally, the number of the diagonal bracing rods is two, and the two diagonal bracing rods are spatially cross-arranged.

[0009] Optionally, the connecting portion is a plurality of connecting holes, and the positions of the connecting holes correspond one-to-one to the bolt holes on the connecting surface of the steel support column and the bolt holes on the connecting surface of the steel arch frame.

[0010] Optionally, the shapes of the upper connecting plate and the lower connecting plate are the same as the connecting end faces of the steel support columns and the connecting end faces of the steel arch frames.

[0011] Optionally, a bell mouth is provided at the same end of each sleeve.

[0012] The present invention also provides a mortar anchor support connection method, which is implemented by using the mortar anchor support connection device described above:

[0013] First, a plurality of mortar anchor rods are embedded in the side wall of the tunnel so that each mortar anchor rod corresponds to the end position of the casing, a plurality of casings are correspondingly inserted into each mortar anchor rod, and then the clamping screws are tightened;

[0014] Then, a steel support column is erected near the side wall of the tunnel, and the connecting surface of the steel support column is connected to the connecting portion on the lower connecting plate;

[0015] Finally, a steel arch frame is erected on the top of the tunnel, and the connecting surface of the steel arch frame is connected to the connecting portion on the upper connecting plate.

[0016] The mortar anchor support connection device and support connection method of the present invention respectively set sleeves on both sides of the upper connecting plate and the lower connecting plate, and connect the upper connecting plate, the lower connecting plate and the plurality of sleeves through a plurality of straight support rods to form a rectangular frame structure, which can be pre-selected and processed, completely avoiding the unfavorable conditions of welding in the hole, and effectively ensuring the construction quality. The device cooperates with the locking foot anchor rod driven into the cofferdam at one end through the sleeve, and fixes the locking foot anchor rod through the clamping screw radially screwed into the sleeve, and is connected to the connecting end of the steel arch frame and the connecting end of the steel support column through the connecting part on the upper connecting plate and the connecting part on the lower connecting plate, respectively, without welding, and is convenient for construction, ensuring the timeliness of the initial steel support. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the forward structure of the mortar anchor support connection device of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the lateral structure;

[0019] Figure 3 yes Figure 1 Schematic diagram of the usage status of the mortar anchor support connection device.

[0020] In the above figure: 1 upper connecting plate; 2 lower connecting plate; 3 casing; 4 straight support rod; 5 clamping screw; 6 diagonal support rod; 7 mortar anchor rod; 8 steel support column; 9 steel arch frame.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0022] Example 1

[0023] refer to Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention proposes a mortar anchor support connection device, comprising an upper connecting plate 1, a lower connecting plate 2, a plurality of sleeves 3 and a straight support rod 4; the sleeve 3 can be sleeved on the outside of the mortar anchor 7, the upper connecting plate 1 and the lower connecting plate 2 are arranged in parallel up and down, the plurality of sleeves 3 are respectively arranged on both sides of the upper connecting plate 1 and the lower connecting plate 2, and the straight support rod 4 is connected between every two adjacent sleeves 3 up and down; wherein, the upper connecting plate 1 and the lower connecting plate 2 are respectively provided with connecting parts, and the tube wall of each sleeve 3 is respectively provided with a screw hole, and a tightening screw 5 is assembled in the screw hole.

[0024] A plurality of groups of mortar anchor rods 7 are vertically buried in the wall of the engineering tunnel in advance, and the number and distribution position of each group of mortar anchor rods 7 correspond to the plurality of sleeves 3 on each supporting device. After the plurality of sleeves 3 in the supporting device are correspondingly sleeved on each group of mortar anchor rods 7 one by one, the mortar anchor rods 7 are fixed to the supporting device by tightening the clamping screws 5; after the steel support column 8 is erected near the wall of the engineering tunnel, the connecting surface of the steel support column 8 is aligned with the lower connecting plate 2 of the supporting device, and the connecting part of the lower connecting plate 2 is fixedly connected to the connecting surface of the steel support column 8, and when the steel arch frame 9 is erected at the top of the engineering tunnel, the connecting surface of the steel arch frame 9 is fixedly connected to the connecting part of the upper connecting plate 1 of the supporting device.

[0025] Example 2

[0026] refer to Figure 1 , Figure 2 and Figure 3 On the basis of Example 1, the upper connecting plate 1 and the lower connecting plate 2 are both rectangular plates, the number of the straight support rods 4 is four, and the four straight support rods 4 are distributed in a rectangular array.

[0027] Each straight support rod 4 is respectively connected between the ends of a pair of upper and lower adjacent sleeves 3, so that the four sleeves 3 remain parallel to each other, thereby keeping the upper connecting plate 1 and the lower connecting plate 2 parallel. The four straight support rods 4 are distributed in a rectangular array to support the two ends of each sleeve 3, so that the supporting force is evenly distributed on the upper connecting plate 1 and the lower connecting plate 2.

[0028] Example 3

[0029] refer to Figure 2and Figure 3 On the basis of Example 1, it also includes a diagonal brace 6, one end of the diagonal brace 6 is connected to the sleeve 3 on one side of the upper connecting plate 1, and the other end is connected to the sleeve 3 on the other side of the lower connecting plate 2.

[0030] The diagonal braces 6 between the sleeves 3 on different sides of the upper connecting plate 1 and the lower connecting plate 2 can improve the supporting effect of the upper connecting plate 1 and the lower connecting plate 2 on the transverse shear force.

[0031] Example 4

[0032] refer to Figure 2 and Figure 3 On the basis of Embodiment 3, the number of the diagonal braces 6 is two, and the two diagonal braces 6 are spatially cross-arranged.

[0033] The upper end of the first diagonal brace 6 is connected to the sleeve 3 on the left side of the upper connecting plate 1, and the lower end is connected to the sleeve 3 on the right side of the lower connecting plate 2. The upper end of the second diagonal brace 6 is connected to the sleeve 3 on the right side of the upper connecting plate 1, and the lower end is connected to the sleeve 3 on the left side of the lower connecting plate 2.

[0034] Example 5

[0035] refer to Figure 2 and Figure 3 On the basis of Example 1, the connection portion is a plurality of connection holes, and the connection holes correspond one to one with the bolt holes on the connection surface of the steel support column 8 and the bolt holes on the connection surface of the steel arch frame 9.

[0036] There are four connecting holes, which are distributed in a rectangular array on the upper connecting plate 1 and the lower connecting plate 2, respectively, and are aligned with the bolt holes on the connecting surface of the steel support column 8. The steel arch frame 9 and the upper connecting plate 1 are connected together after bolts are passed through the connecting holes on the upper connecting plate 1 and the corresponding bolt holes on the connecting surface of the steel arch frame 9; the steel support column 8 and the lower connecting plate 2 are connected together after bolts are passed through the connecting holes on the lower connecting plate 2 and the corresponding bolt holes on the connecting surface of the steel support column 8.

[0037] Example 6

[0038] On the basis of Example 5, the shapes of the upper connecting plate 1 and the lower connecting plate 2 are the same as the connecting end faces of the steel support column 8 and the connecting end faces of the steel arch frame 9 .

[0039] When the upper connecting plate 1 and the steel arch frame 9 as well as the lower connecting plate 2 and the steel support column 8 are connected together by bolts, the connecting end faces of the upper connecting plate 1 and the steel arch frame 9 are just aligned, and the connecting end faces of the lower connecting plate 2 and the steel support column 8 are just aligned. Since the upper connecting plate 1 and the lower connecting plate 2 are aligned up and down, the connecting end faces of the steel arch frame 9 and the connecting end faces of the steel support column 8 are aligned, which is beneficial to the stable support between the entire steel arch frame 9 and the steel support column 8.

[0040] Example 7

[0041] Based on any of the above embodiments, a bell mouth (not shown in the figure) is provided at the same end of each sleeve 3 .

[0042] The end of the casing 3 has a bell mouth, which facilitates the insertion of the mortar anchor rod 7 into the casing 3 .

[0043] Example 8

[0044] An embodiment of the present invention proposes a mortar anchor support connection method, which adopts the mortar anchor support connection device described above, mainly pre-embedding multiple mortar anchors 7 on the side wall of the tunnel, so that each mortar anchor 10 corresponds to the end position of the casing 3, and multiple casings 3 are correspondingly inserted into each mortar anchor 3, and then the clamping screws 5 are tightened; then a steel support column 8 is erected near the side wall of the tunnel, and the connecting surface of the steel support column 8 is connected to the connecting part on the lower connecting plate 2; finally, a steel arch frame 9 is erected on the top of the tunnel, and the connecting surface of the steel arch frame 9 is connected to the connecting part on the upper connecting plate 1.

[0045] In actual construction, according to the requirements of tunnel excavation support and the position of steel support segment nodes, first, mortar anchor rods 3 are symmetrically applied at the support connection position, and mortar anchor rod support connection devices of corresponding sizes are made according to the specific models of steel support columns 8 and steel arch frames 9. The row spacing between each mortar anchor rod 7 is between 15cm and 30cm. Note that the mortar anchor rod 7 is exposed 10~20cm as required. After the mortar anchor rod 7 is formed, each sleeve 3 in the mortar anchor rod support connection device is half-covered on the exposed section of each mortar anchor rod 10. The inner diameter of the sleeve 3 is generally larger than the diameter of the mortar anchor rod 7 by 6~10mm, and the tightening screw 5 is used for pre-tightening and fine-tuning.

[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims

1. A mortar anchor support connection device, characterized in that: The invention comprises an upper connecting plate (1), a lower connecting plate (2), a plurality of sleeves (3) and a straight support rod (4); the sleeve (3) can be sleeved outside the mortar anchor rod (7); the upper connecting plate (1) and the lower connecting plate (2) are arranged in parallel vertically; the plurality of sleeves (3) are respectively arranged on both sides of the upper connecting plate (1) and on both sides of the lower connecting plate (2); the straight support rod (4) is connected between every two sleeves (3) adjacent to each other vertically; wherein the upper connecting plate (1) and the lower connecting plate (2) are respectively provided with a connecting portion; a screw hole is respectively provided on the tube wall of each sleeve (3); a clamping screw (5) is assembled in the screw hole; The upper connecting plate (1) and the lower connecting plate (2) are both rectangular plates; It also comprises an oblique brace (6), one end of the oblique brace (6) being connected to the sleeve (3) on one side of the upper connecting plate (1), and the other end of the oblique brace (6) being connected to the sleeve (3) on the other side of the lower connecting plate (2); The number of the straight support rods (4) is four, and the four straight support rods (4) are distributed in a rectangular array.

2. The mortar anchor support connection device according to claim 1, characterized in that: The number of the diagonal bracing rods (6) is two; the two diagonal bracing rods (6) are spatially cross-arranged.

3. The mortar anchor support connection device according to claim 1, characterized in that: The connection portion is a plurality of connection holes, and the connection holes correspond one-to-one with the positions of the bolt holes on the connection surface of the steel support column (8) and the bolt holes on the connection surface of the steel arch frame (9).

4. The mortar anchor support connection device according to claim 3, characterized in that: The shapes of the upper connecting plate (1) and the lower connecting plate (2) are the same as the connecting end faces of the steel support columns (8) and the connecting end faces of the steel arch frames (9).

5. The mortar anchor support connection device according to claim 1, characterized in that: The same end of each sleeve (3) is provided with a bell mouth.

6. A mortar anchor support connection method, using the mortar anchor support connection device according to any one of claims 1 to 5, characterized in that: Pre-embedding a plurality of the mortar anchor rods (7) on the side wall of the tunnel so that each mortar anchor rod (7) corresponds to the end position of the casing (3), inserting a plurality of the casings (3) into each mortar anchor rod (7) accordingly, and then tightening the clamping screw (5); Erecting a steel support column (8) near the side wall of the tunnel, and connecting the connection surface of the steel support column (8) to the connection portion on the lower connecting plate (2); A steel arch frame (9) is erected on the top of the tunnel, and the connecting surface of the steel arch frame (9) is connected to the connecting portion on the upper connecting plate (1).

Images