Construction method for in-well reinforcement of pipe jacking construction portal
By setting up a support system and pouring foam concrete in the pipe-pipe well, the problem of no working space outside the pipe-pipe well is solved, efficient reinforcement of the hole door is achieved, the safety of the pipe-pipe well is ensured, and construction efficiency is improved and costs are reduced.
Patent Information
- Application Number
- CN202411852095.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-03-21
AI Technical Summary
The existing pipe-pipe wells are difficult to effectively reinforce due to the lack of external construction space when reinforcing the hole door, which leads to the risk of earth collapse and water leakage when the hole door is chiseled, affecting the safety of pipe-pipe.
A support system is set up in the well, including the main support and steel support, and aerated concrete bricks are built between them, followed by pouring foam concrete, and the support system is removed layer by layer to achieve efficient reinforcement of the hole door.
By reinforcing in the raft well, the problem of insufficient external space is solved, efficient and quick reinforcement of the hole door is achieved, the safety of the raft hole door is ensured, and the conditions are created for the smooth rafting of the raft pipe, and the construction speed is fast and the cost is low.
Smart Images
Figure CN119664394A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of reinforcing a launching tunnel door in a jacking pipe project, and in particular to a construction method for reinforcing a launching tunnel door in a jacking pipe. Background Art
[0002] Existing pipe jacking wells are often constructed with caisson type or underground continuous wall support. In order to ensure the safety of the starting well tunnel when it is chiseled out and prevent the soil outside the tunnel from gushing out, collapsing or leaking water, the traditional method is to vertically grout (high-pressure rotary jet piles, etc.) reinforce or drive steel sheet piles for retaining soil on the outside of the well wall in the jacking direction of the starting well. However, in reality, there is no construction space outside the well wall for vertical grouting and driving steel sheet piles, or the grouting reinforcement effect outside the well wall is poor. Grouting from the well wall horizontally to the outside of the well, the grouting range is affected by the supporting well wall, and large-scale construction cannot be carried out. In addition, the reinforcement depth of horizontal grouting is limited by the process. As a result, when the pipe jacking tunnel door of the starting well is chiseled out, there are major risks of earth collapse, water leakage, etc., which directly affect the safety of pipe jacking. Summary of the invention
[0003] In view of this, the present invention proposes a construction method for reinforcing the inner side of a tunnel for jacking pipe, comprising:
[0004] The tunnel is determined. On the supporting wall in the jacking direction of the jacking well, the position of the tunnel is located and chiseled out to form the tunnel;
[0005] The construction tunnel door is provided with a support system, firstly, a plurality of main rib supports are provided on the construction tunnel door, and then a steel brace is provided, one end of which is supported on the main rib support and the other end is supported on the pipe jacking machine;
[0006] Aerated concrete brick masonry: between the tunnel door and the pipe jacking machine, aerated concrete bricks are laid along the height of the tunnel door to form a closed trough-shaped space with an upper opening;
[0007] For pouring foam concrete, remove the bottom support system, and then pour foam concrete in the closed trough space at the corresponding position. After the foam concrete reaches the required strength, continue to remove the support system layer by layer, and pour foam concrete in the closed trough space layer by layer.
[0008] The pipe jacking machine is used to push forward, rotate the cutter head, break the foam concrete, and enable the pipe jacking machine to push forward.
[0009] Furthermore, when the tunnel is chiseled out, the steel mesh layer and the ultra-thin steel protective layer on the outside of the supporting wall are retained.
[0010] Furthermore, the main rib support is a horizontal steel beam, both ends of which are temporarily fixed to the side walls in the width direction of the tunnel door.
[0011] Furthermore, the length of the horizontal steel beam is consistent with the width of the firing tunnel.
[0012] Furthermore, the steel brace is an adjusting screw rod, one end of which is connected to the main rib support and the other end of which is connected to the cutter disc at the front of the pipe jacking machine.
[0013] Furthermore, when the support system is dismantled, the steel mesh layer is correspondingly dismantled layer by layer, and the ultra-thin steel protection layer is retained.
[0014] Furthermore, the ultra-thin steel bar protective layer is the outermost protective layer of the supporting wall with a thickness of 5 to 10 cm.
[0015] Furthermore, a plurality of main rib supports are sequentially arranged along the firing hole from bottom to top.
[0016] Furthermore, a plurality of the steel braces are arranged in sequence along the length direction of the main rib support at the same preset distance.
[0017] Furthermore, the horizontal steel beam is arranged close to the steel mesh layer.
[0018] The invention provides a construction method for reinforcing the shaft of a launching tunnel for jacking pipe, which has the following advantages: in the launching shaft for the launching tunnel, when the supporting wall of the tunnel is removed, the steel bars and protective layer on the outer side of the supporting wall are retained as a temporary supporting surface for the heading face of the launching tunnel; by erecting beams and steel braces on the temporary supporting surface, the steel bars on the outer side of the supporting wall are cut layer by layer, the beams and steel braces are removed, and low-strength foam concrete is poured in layers to fill the gap space between the heading face and the jacking machine head; this solves the problem of reinforcement without working space outside the launching shaft or poor reinforcement, realizes efficient and fast reinforcement of the launching shaft tunnel, ensures the safety of the launching tunnel for jacking pipe, and creates decisive conditions for the smooth advancement of the jacking pipe; in addition, this method has a fast construction speed, is not affected by external geology and working environment, and has low construction cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0020] Figure 1 A construction method step diagram for reinforcing a tunnel well for a jacking pipe provided by an embodiment of the present invention;
[0021] Figure 2 A schematic diagram of a structure in which only the outer steel mesh layer and the ultra-thin steel protection layer of the supporting wall remain after the top pipe tunnel door provided by the embodiment of the present invention is chiseled out;
[0022] Figure 3 A schematic diagram of a temporary reinforcement structure of a horizontal beam and steel braces for a tunnel door provided in an embodiment of the present invention;
[0023] Figure 4 A schematic diagram of the cross-sectional structure of the temporary reinforcement of the tunnel door with horizontal beams and steel braces provided in an embodiment of the present invention;
[0024] Figure 5 A schematic diagram of the structure of laying aerated concrete bricks between the tunnel door and the pipe jacking machine provided in an embodiment of the present invention;
[0025] Figure 6 A schematic diagram of the structure of removing the first layer of the bottom support system between the tunnel door and the pipe jacking machine provided in an embodiment of the present invention;
[0026] Figure 7 A schematic diagram of the structure after pouring the first layer of foam concrete between the tunnel door and the pipe jacking machine provided in an embodiment of the present invention;
[0027] Figure 8 A schematic diagram of the structure after the second layer of support system between the tunnel door and the pipe jacking machine provided in an embodiment of the present invention is removed;
[0028] Fig. 9 A schematic diagram of the structure after all foam concrete walls are poured between the tunnel door and the pipe jacking machine provided in an embodiment of the present invention;
[0029] Fig.10 A schematic diagram of the cross-sectional structure after all the foam concrete is poured between the tunnel door and the pipe jacking machine provided in an embodiment of the present invention;
[0030] In the figure, 1. launching well, 2. pipe jacking machine, 3. cutter head, 4. supporting wall, 5. steel mesh layer, 6. ultra-thin steel protective layer, 7. main rib support (i.e. horizontal steel beam), 8. steel brace (i.e. adjusting screw rod), 9. aerated concrete brick, 10. foam concrete, 11. launching tunnel gate. DETAILED DESCRIPTION
[0031] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0032] See also Figure 1As shown, it is a construction method for reinforcing the tunnel portal of a jacking pipe provided by an embodiment of the present invention, including the following operating steps:.
[0033] SO1, the launching tunnel is determined. On the supporting wall in the jacking direction of the jacking well, the position of the jacking tunnel is located and chiseled out to form the tunnel;
[0034] SO2, a support system is set up for the tunnel portal. First, multiple main rib supports are set up on the tunnel portal. Then, a steel brace is set up, one end of which is supported on the main rib support and the other end is supported on the pipe jacking machine.
[0035] SO3, aerated concrete brick masonry, between the construction tunnel door and the pipe jacking machine, aerated concrete bricks are laid along the height of the construction tunnel door to form a closed trough-shaped space with an upper opening;
[0036] SO4, pouring of foamed concrete, dismantling the bottom layer of the support system, and then pouring foamed concrete in the closed trough space at the corresponding position. After the foamed concrete reaches the strength, continue to dismantle the support system layer by layer upwards, and pour foamed concrete in the closed trough space layer by layer;
[0037] SO5, the pipe jacking machine is used to push forward, the cutter head is rotated to break the foam concrete and enable the pipe jacking machine to push forward.
[0038] The most preferred embodiment of the construction method for reinforcing the tunnel entrance of the jacking pipe is as follows:
[0039] (I) On the supporting wall 4 in the jacking direction of the jacking well 1, locate the position of the jacking hole 11, and chisel out the hole 11 formed on the supporting wall 4. During the chiseling process, retain the outer side of the supporting wall 4, that is, the side of the supporting wall 4 close to the earthwork, retain the steel mesh 5 and the ultra-thin steel protective layer 6. The ultra-thin steel protective layer is the outermost protective layer of the supporting wall with a thickness of 5 to 10 cm. Figure 2-3 As shown;
[0040] (ii) According to the cross-sectional dimensions of the jacking tunnel 11, a number of horizontal steel beams 7 are reasonably arranged. The width of the horizontal steel beams 7 is the same as the width of the tunnel 11. The horizontal steel beams 7 are close to the outer steel mesh 5 of the supporting wall. The two ends of the horizontal steel beams 7 are temporarily fixed to the side walls in the width direction of the tunnel 11 to ensure that the horizontal steel beams can serve as the main support of the outer steel mesh 5 of the supporting wall. Figure 3-4 As shown;
[0041] (III) An adjusting screw rod is used as a steel brace 8, one end of which is supported on a horizontal steel beam 7, and the other end is supported on a cutter head 3 at the front of a pipe jacking machine 2 in the launch well 1. The steel brace 8 is evenly arranged along the length of the horizontal steel beam 7 to form a stable support system. That is, the external soil pressure is transmitted in the following order: steel protection layer 6 + steel mesh layer 5 → horizontal steel beam 7 → steel brace 8 → pipe jacking machine 2, that is, the soil pressure outside the launch tunnel 11 and the internal support force system are kept stable, thereby ensuring the safety of the launch tunnel 11. Figure 2-4 As shown;
[0042] (IV) Between the tunnel door 11 and the pipe jacking machine 2, aerated concrete bricks 9 are laid along the height of the tunnel door 11 to form a closed groove-shaped space with an upper opening, referring to Figure 5-9 As shown;
[0043] (V) Remove the support system of the first layer of horizontal steel beams 7 and steel braces 8 at the bottom, and remove the steel mesh layer 5, leaving the steel protection layer 6 unremoved, and then immediately fill the first layer of space after the removal with low-strength foam concrete 10 from bottom to top; remove the support system layer by layer from bottom to top, and pour low-strength foam concrete 10 layer by layer, referring to Figure 6-9 As shown;
[0044] (VI) After the low-strength foam concrete 10 on the first layer of space at the bottom reaches the required strength, the horizontal steel beam 7, steel brace 8 and steel mesh layer 5 are removed layer by layer from bottom to top, leaving the steel protection layer 6 intact, and at the same time, each layer of space after removal is filled with low-strength foam concrete 10 layer by layer, and finally the pouring of all foam concrete is completed, that is, the entire space between the construction tunnel door 11 and the pipe jacking machine 2 is filled with foam concrete, thereby completing the force system conversion, that is, the force transmission system in the direction of steel protection layer 6 + steel mesh 5 → horizontal steel beam 7 → steel brace 8 → pipe jacking machine 2 is converted into the force transmission system in the direction of steel protection layer 6 → low-strength foam concrete 10 → pipe jacking machine 2. At the same time, the transfer of the construction working surface of the pipe jacking machine is transferred from the construction tunnel door 11 to the low-strength foam concrete 10. Figure 6-10 As shown;
[0045] Specifically, through the above operation, without completely drilling through the tunnel door 11, the jacking operation surface is safely and smoothly moved back to the low-strength foam concrete 10, thereby ensuring the safety of the tunnel door and creating absolutely safe conditions for the jacking machine to operate;
[0046] (VII) The pipe jacking machine 2 is used to push forward, and the cutter head 3 is rotated to break the low-strength foam concrete 10 and the ultra-thin steel bar protective layer 6, and the pipe jacking machine is smoothly pushed forward. Fig.10 shown.
[0047] In summary, the embodiment of the present invention provides a construction method for reinforcing the inside of a tunnel for jacking, which has the following beneficial technical effects: in the launching shaft of the tunnel, when the supporting wall of the tunnel is removed, a steel bar king layer and an ultra-thin steel bar protective layer are retained on the outside of the supporting wall to serve as a temporary support surface for the heading position of the launching tunnel; horizontal beams and steel braces are set up on the temporary support surface, one side of which supports the newly added horizontal beam at the heading, and the other side supports the jacking machine head; a method is adopted in which the steel mesh layer on the outside of the supporting wall is cut in layers, the horizontal beams and steel braces are removed, and low-strength foam concrete is poured in layers to fill the gap space between the heading and the jacking machine head; this solves the problem of reinforcement or poor reinforcement without working space outside the launching shaft, and achieves efficient and fast construction of the launching shaft tunnel. The reinforcement ensures the safety of the tunnel for jacking pipe launching, creates decisive conditions for the smooth advancement of jacking pipe, and this method has a fast construction speed, is not affected by the external geology and working environment, and has low construction costs. This method of in-well reinforcement of the tunnel for jacking pipe launching has a clear construction idea and simple operation. It does not require the purchase of special materials and equipment, and can be completed with common materials on the construction site. It does not affect the construction period and occupy the external space of the jacking pipe well. It is green, safe and fast construction. There is no problem of reinforcement or poor reinforcement of the working space outside the launching well, which realizes the efficient and fast reinforcement of the launching well tunnel, ensures the safety of the tunnel for jacking pipe launching, and creates decisive conditions for the smooth advancement of jacking pipe, and this method has a fast construction speed, is not affected by the external geology and working environment, and has low construction costs.
[0048] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.
[0049] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A construction method for reinforcing a tunnel for a jacking pipe, characterized in that: include: The tunnel is determined. On the supporting wall in the jacking direction of the jacking well, the position of the tunnel is located and chiseled out to form the tunnel; The construction tunnel door is provided with a support system, firstly, a plurality of main rib supports are provided on the construction tunnel door, and then a steel brace is provided, one end of which is supported on the main rib support and the other end is supported on the pipe jacking machine; Aerated concrete brick masonry: between the tunnel door and the pipe jacking machine, aerated concrete bricks are laid along the height of the tunnel door to form a closed trough-shaped space with an upper opening; For pouring foam concrete, the support system of the bottom layer is removed, and then the foam concrete is poured in the closed trough space at the corresponding position. After the foam concrete reaches the required strength, the support system is removed layer by layer upwards, and the foam concrete is poured in the closed trough space layer by layer. The pipe jacking machine is used to push forward, rotate the cutter head, break the foam concrete, and enable the pipe jacking machine to push forward.
2. The construction method for reinforcing the tunnel of a jacking pipe according to claim 1 is characterized in that: When the triggering tunnel is chiseled out, the steel mesh layer and the ultra-thin steel protection layer on the outer side of the supporting wall are retained.
3. The construction method for reinforcing the tunnel of a jacking pipe according to claim 2 is characterized in that: The main rib support is a horizontal steel beam, both ends of which are temporarily fixed to the side walls in the width direction of the tunnel.
4. The construction method for reinforcing the tunnel of a jacking pipe according to claim 3 is characterized in that: The length of the horizontal steel beam is consistent with the width of the firing tunnel door.
5. The construction method for reinforcing the tunnel of a jacking pipe according to claim 1 is characterized in that: The steel brace is an adjusting screw rod, one end of which is connected to the main rib support, and the other end is connected to the cutter disc at the front of the pipe jacking machine.
6. The construction method for reinforcing the tunnel of a jacking pipe according to claim 2, characterized in that: When dismantling the support system, the steel mesh layer is correspondingly dismantled layer by layer, and the ultra-thin steel protection layer is retained.
7. The construction method for reinforcing the tunnel of a jacking pipe according to claim 2, characterized in that: The ultra-thin steel bar protective layer is the outermost protective layer of the supporting wall with a thickness of 5 to 10 cm.
8. The construction method for reinforcing the tunnel of a jacking pipe according to claim 1, characterized in that: The main rib supports are arranged in sequence from bottom to top along the discharge hole.
9. The construction method for reinforcing the tunnel of a jacking pipe according to claim 1, characterized in that: The steel braces are arranged in plurality along the length direction of the main rib support at intervals of the same preset distance.
10. The construction method for reinforcing the tunnel of a jacking pipe according to claim 2, characterized in that: The horizontal steel beam is arranged closely to the steel mesh layer.