Middle partition wall temporary supporting structure for tunnel construction

Abstract

The utility model discloses a middle partition wall temporary supporting structure for tunnel construction, and relates to the technical field of tunnel supporting. The temporary supporting structure comprises vertical temporary supports, a grating steel frame and steel frame connectors, the vertical temporary supports comprise the first vertical temporary support, the second vertical temporary support, the third vertical temporary support and the fourth vertical temporary support, the grating steel frame is arranged at the tunnel vault, the first vertical temporary support is connected through the first steel frame connector, and the second vertical temporary support is connected through the second steel frame connector. The first vertical temporary support and the second vertical temporary support are connected through a second steel frame connector, the second vertical temporary support and the third vertical temporary support are connected through a third steel frame connector, and the two ends of the fourth vertical temporary support are fixedly connected through a fourth steel frame connector. The heights of the first vertical temporary support and the second vertical temporary support are equal to the height of an arch step, the heights of the third vertical temporary support and the fourth vertical temporary support are equal to the height of the step during excavation, and the strength and stability of the vertical temporary supports can be improved through the structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to tunnel support technical field especially provide a tunnel construction with temporary support structure of mid partition wall. BACKGROUND

[0002] In prior art, the method of partition wall excavation is usually used in subway tunnel, and the temporary vertical support of mid partition wall is mostly reinforced concrete structure composed of section steel and concrete. Taking the tunnel constructed by double-layer primary support arch cover method as an example, when the arch part of the tunnel is initially supported by grid steel frame concrete, the temporary support of mid partition wall is composed of vertical supports of multiple I-beams. After the second layer of primary support construction of the tunnel arch part is completed, the vertical support of mid partition wall can be removed section by section. Due to the complex stress at the horsehead door part, in order to ensure the safety of construction, the vertical support of mid partition wall within a certain length needs to be reserved at the intersection parts of the vertical shaft and the horizontal passage, the horizontal passage and the main body of the station, and gradually extends downward along with the excavation of the lower rock mass of the tunnel until the tunnel floor. The height of the subway station and the horizontal passage is large, and along with the extension of the temporary vertical support, the height-width ratio gradually increases, and the stability of the structure decreases, sometimes the lateral support needs to be used to increase the stability. SUMMARY

[0003] In order to increase the strength and stability of the vertical temporary support of the tunnel, the utility model provides a temporary support structure of mid partition wall for tunnel construction, and the specific technical scheme is as follows.

[0004] A temporary support structure of mid partition wall for tunnel construction, comprising vertical temporary supports, a grid steel frame and steel frame joints, the vertical temporary supports comprising first vertical temporary supports, second vertical temporary supports, third vertical temporary supports and fourth vertical temporary supports, the grid steel frame being arranged at the tunnel vault, the steel frame joints comprising first steel frame joints, second steel frame joints, third steel frame joints and fourth steel frame joints, the upper connecting plate and the lower connecting plate of the steel frame joint being fixedly connected through bolts, and I-beam insertion grooves being arranged on the upper connecting plate and the lower connecting plate respectively; the first vertical temporary supports are connected through the first steel frame joints, the first vertical temporary supports and the second vertical temporary supports are connected through the second steel frame joints, the second vertical temporary supports and the third vertical temporary supports are connected through the third steel frame joints, and the two ends of the fourth vertical temporary supports are connected and fixed through the fourth steel frame joints.

[0005] Preferably, the first vertical temporary supports and the second vertical temporary supports use I-beams of the same type, and the third vertical temporary supports and the fourth vertical temporary supports use I-beams of the same type.

[0006] Preferably, the first vertical temporary supports and the second vertical temporary supports use 25b type I-beams, and the third vertical temporary supports and the fourth vertical temporary supports use 40b type I-beams.

[0007] Preferably, the upper connecting plate of the third steel frame joint is smaller in size than the lower connecting plate, the I-beam slot of the upper connecting plate of the third steel frame joint is matched with the second vertical temporary support I-beam, and the I-beam slot of the lower connecting plate of the third steel frame joint is matched with the third vertical temporary support I-beam.

[0008] Preferably, the adjacent I-beams are fixedly connected by welding steel bars.

[0009] Preferably, the I-beam slots are arranged in the middle of the upper connecting plate and the lower connecting plate, and a plurality of bolt holes are uniformly arranged on both sides of the I-beam slots.

[0010] Preferably, the spacing between the grid steel frames in the tunnel is equal to the spacing between the temporary support structures.

[0011] Preferably, the sum of the heights of the first vertical temporary support and the second vertical temporary support is equal to the step height of the arch, and the sum of the heights of the third vertical temporary support and the fourth vertical temporary support is equal to the excavated step height.

[0012] Further preferably, the plurality of vertical temporary supports are connected in sequence, and the sizes of the vertical temporary supports increase in sequence from top to bottom.

[0013] The tunnel construction mid-partition temporary support structure has the advantages that the temporary support structure overcomes the shortcomings of the prior support structure, utilizes the variable cross-section vertical support, replaces the large-size section steel as the reinforced concrete framework when the rock mass at the lower part of the tunnel is excavated, is connected with the upper vertical support section steel, forms the variable cross-section reinforced concrete structure, and can increase the strength and stability of the vertical temporary support. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a tunnel construction partition temporary support structure construction structure diagram;

[0015] Figure 2 is a side view of the first steel frame joint;

[0016] Figure 3 is a sectional view of the first steel frame joint;

[0017] Figure 4 is a side view of the second steel frame joint;

[0018] Figure 5 is a sectional view of the second steel frame joint;

[0019] Figure 6 is a side view of the third steel frame joint;

[0020] Figure 7 is a sectional view of the third steel frame joint;

[0021] Figure 8 is a side view of the fourth steel frame joint;

[0022] Figure 9 is a sectional view of the fourth steel frame joint;

[0023] In the drawing: 1 - vertical temporary support, 2 - grid steel frame, 3 - steel frame joint;

[0024] 11 - first vertical temporary support, 12 - second vertical temporary support, 13 - third vertical temporary support, 14 - fourth vertical temporary support, 15 - I-beam;

[0025] 31 - first steel frame joint, 32 - second steel frame joint, 33 - third steel frame joint, 34 - fourth steel frame joint, 35 - upper connecting plate, 36 - lower connecting plate, 37 - I-beam slot, 38 - bolt hole. DETAILED DESCRIPTION

[0026] In combination Figures 1 to 9 The specific embodiments of the utility model provide a kind of mid-partition temporary support structure for tunnel construction as shown in the description.

[0027] A kind of mid-partition temporary support structure for tunnel construction, it includes vertical temporary support 1, grid steel frame 2 and steel frame joint 3, vertical temporary support structure is divided into multiple levels of support and is supported in the height direction of tunnel section structure, grid steel frame is supported as a whole to tunnel arch, steel frame joint adapts to the I-beam model change of vertical temporary support structure, realizes the connection and fixation of I-beam structure.Vertical temporary support 1 includes first vertical temporary support 11, second vertical temporary support 12, third vertical temporary support 13, fourth vertical temporary support 14, first vertical temporary support 11, second vertical temporary support 12, third vertical temporary support 13, fourth vertical temporary support 14 are sequentially connected from top to bottom, grid steel frame 2 is arranged at tunnel vault, and arch top is supported.Steel frame joint 3 includes first steel frame joint 31, second steel frame joint 32, third steel frame joint 33, fourth steel frame joint 34, and the upper connecting plate 35 and the lower connecting plate 36 of steel frame joint 3 are fixedly connected by bolt, and the upper connecting plate 35 and the lower connecting plate 36 are respectively provided with I-beam slot 37, and the size of I-beam slot is determined according to the size of I-beam of vertical temporary support.First vertical temporary support 11 is connected by first steel frame joint 31, first vertical temporary support 11 and second vertical temporary support 12 are connected by second steel frame joint 32, second vertical temporary support 12 and third vertical temporary support 13 are connected by third steel frame joint, and the both ends of fourth vertical temporary support 14 are connected and fixed by fourth steel frame joint, and the both ends of fourth vertical temporary support 14 are respectively connected third vertical temporary support and bottom plate.

[0028] The first vertical temporary support 11 and the second vertical temporary support 12 use the same type of I-beam 15, and the third vertical temporary support 13 and the fourth vertical temporary support 14 use the same type of I-beam 15. In the double-layer primary support arch cover method, the first vertical temporary support and the second vertical temporary support use the 25b type of I-beam, and the third vertical temporary support 13 and the fourth vertical temporary support 14 use the 40b type of I-beam.

[0029] The upper connecting plate of the third steel frame joint 33 is smaller in size than the lower connecting plate, the I-beam slot 35 of the upper connecting plate of the third steel frame joint 33 is matched with the I-beam of the second vertical temporary support, and the I-beam slot of the lower connecting plate of the third steel frame joint 33 is matched with the I-beam of the third vertical temporary support 13.

[0030] In addition, the adjacent I-beams 15 are fixedly connected by welding steel bars, and the connection of the I-beams can be further reinforced. The I-beam slot 37 is arranged in the middle of the upper connecting plate and the lower connecting plate, and a plurality of bolt holes are uniformly arranged on both sides of the I-beam slot 37.

[0031] The spacing between the inner grid steel frames in the tunnel is equal to the spacing between the temporary support structures, and the size of the tunnel and the arrangement of the inner grid steel frames are set.

[0032] The sum of the heights of the first vertical temporary support 11 and the second vertical temporary support 12 is equal to the step height of the arch, and the sum of the heights of the third vertical temporary support 13 and the fourth vertical temporary support 14 is equal to the excavated step height.

[0033] The plurality of vertical temporary supports are connected in sequence, and the sizes of the vertical temporary supports increase in sequence from top to bottom; in the application to multi-layer construction, a plurality of sizes of I-beams can be used, so as to adapt to more construction environments.

[0034] The temporary support structure is mainly applied to tunnel construction of subway stations, cross passages and the like, overcomes the shortcomings of the existing support structures, utilizes the variable cross-section vertical support, replaces the large-size section steel as the reinforced concrete framework when the lower rock mass of the tunnel is excavated, is connected with the upper vertical support section steel, forms a variable cross-section reinforced concrete structure, and can increase the strength and stability of the vertical temporary support.

[0035] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or replacements made by the person skilled in the art within the essential scope of the present application should also belong to the protection scope of the present application.

Claims

1. A temporary diaphragm wall support structure for tunnel construction, characterized by, The vertical temporary support includes a first vertical temporary support, a second vertical temporary support, a third vertical temporary support and a fourth vertical temporary support, the grid steel frame is arranged at a tunnel vault, the steel frame joint includes a first steel frame joint, a second steel frame joint, a third steel frame joint and a fourth steel frame joint, the upper connecting plate and the lower connecting plate of the steel frame joint are fixedly connected through bolts, and I-shaped steel slots are arranged on the upper connecting plate and the lower connecting plate respectively; the first vertical temporary support is connected through the first steel frame joint, the first vertical temporary support and the second vertical temporary support are connected through the second steel frame joint, the second vertical temporary support and the third vertical temporary support are connected through the third steel frame joint, and the two ends of the fourth vertical temporary support are connected and fixed through the fourth steel frame joint.

2. The temporary diaphragm wall support structure for tunnel construction according to claim 1, wherein The first vertical temporary support and the second vertical temporary support use the same type of I-shaped steel, and the third vertical temporary support and the fourth vertical temporary support use the same type of I-shaped steel.

3. The temporary diaphragm wall support structure for tunnel construction according to claim 1, wherein The first vertical temporary support and the second vertical temporary support use 25b type I-shaped steel, and the third vertical temporary support and the fourth vertical temporary support use 40b type I-shaped steel.

4. The temporary diaphragm wall support structure for tunnel construction according to claim 2 or 3, characterized in that, The size of the upper connecting plate of the third steel frame joint is smaller than the size of the lower connecting plate, the I-shaped steel slot of the upper connecting plate of the third steel frame joint is matched with the I-shaped steel of the second vertical temporary support, and the I-shaped steel slot of the lower connecting plate of the third steel frame joint is matched with the I-shaped steel of the third vertical temporary support.

5. The temporary diaphragm wall support structure for tunnel construction according to claim 2 or 3, wherein The adjacent I-shaped steels are fixedly connected through welding steel bars.

6. The temporary diaphragm wall support structure for tunnel construction of claim 1, wherein The I-shaped steel slot is arranged in the middle part of the upper connecting plate and the lower connecting plate, and a plurality of bolt holes are uniformly arranged on the two sides of the I-shaped steel slot.

7. The temporary diaphragm wall support structure for tunnel construction of claim 1, wherein The spacing between the grid steel frames in the tunnel is equal to the spacing between the temporary support structures.

8. The temporary diaphragm wall support structure for tunnel construction of claim 1, wherein The sum of the heights of the first vertical temporary support and the second vertical temporary support is equal to the step height of the arch part, and the sum of the heights of the third vertical temporary support and the fourth vertical temporary support is equal to the excavated step height.

9. The temporary diaphragm wall support structure for tunnel construction of claim 1, wherein A plurality of vertical temporary supports are sequentially connected, and the sizes of the vertical temporary supports increase sequentially from top to bottom.

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