Foundation pit supporting structure of pipe jacking originating well

Abstract

The utility model relates to the technical field of underground engineering construction, in particular to a supporting structure for a foundation pit of a pipe jacking originating well. Comprising a plurality of precast piles, a plurality of precast slabs, a crown beam and an inner supporting part, the precast piles are inserted into the bottom of a foundation pit along the boundary of the foundation pit, the precast slabs are arranged in the depth direction of the foundation pit, each precast slab is installed between two precast piles on the foundation pit wall on the starting side of a jacking pipe, the crown beam is arranged at the tops of the precast piles, and the inner supporting part is arranged on the top beam. The precast pile pieces in the foundation pit are connected through the inner supporting part; the prefabricated slab is provided with a reserved hole, and the grouting anchor rod is inserted into a foundation pit soil body through the reserved hole. The prefabricated plate comprises a first prefabricated plate and a second prefabricated plate which are close to the jacking pipe, jacking pipe outer contours are reserved on the first prefabricated plate and the second prefabricated plate, and a glass fiber anchor rod is inserted into a soil body in the jacking pipe outer contours. According to the utility model, the risk that the soil body is disturbed and even the foundation pit collapses when the precast pile piece is broken is avoided, the construction safety is ensured, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of underground engineering construction, in particular to a foundation pit supporting structure for a jacking pipe launching well. Background Art

[0002] At present, trenchless pipe jacking construction projects are often used as an important part of urban pipeline laying. The support of the starting pit foundation pit is related to the stability of the foundation pit and the safety of on-site construction. Precast piles are usually used as an important support structure for the starting pit foundation pit. However, after the foundation pit construction is completed and before the jacking starts, the precast piles on the side close to the jacking pipe will be broken. The breaking construction process will not only destroy the foundation pit support structure, but also disturb the soil, increasing the risk of foundation pit instability. In addition, the breaking construction of precast piles will increase construction costs and extend the construction period. Utility Model Content

[0003] The utility model aims to provide a foundation pit support structure for a jacking starting well, so as to alleviate the problems that, after the existing foundation pit construction is completed, the prefabricated piles adjacent to one side of the jacking pipe before the jacking pipe is started are broken, causing damage to the foundation pit support structure, disturbing the soil, increasing construction costs, and prolonging the construction period.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0005] A foundation pit support structure for a jacking start shaft, comprising: a plurality of prefabricated piles, a plurality of prefabricated panels, a crown beam and an inner support portion, wherein the plurality of prefabricated piles are inserted along the foundation pit boundary to the bottom of the foundation pit, the plurality of prefabricated panels are arranged along the depth direction of the foundation pit, and each of the prefabricated panels is installed between two prefabricated piles on the foundation pit wall on the jacking start side, the crown beam is arranged on the top of the plurality of prefabricated piles, and the prefabricated piles inside the foundation pit are connected via the inner support portion;

[0006] The prefabricated plate is provided with a reserved hole, and the grouting anchor rod is inserted into the foundation pit soil through the reserved hole;

[0007] The prefabricated panels include a first prefabricated panel and a second prefabricated panel close to the top pipe, the first prefabricated panel and the second prefabricated panel are pre-reserved with the outer contour of the top pipe, and the soil within the outer contour of the top pipe is inserted with glass fiber anchor rods.

[0008] Furthermore, the width of the prefabricated panel is greater than the diameter of the top pipe, and the height of the prefabricated panel is the depth of each excavation of the foundation pit.

[0009] Furthermore, a steel block is provided on one side where the prefabricated pile is connected to the prefabricated plate, and the steel block is used for welding a fixing groove.

[0010] Furthermore, the fixing groove is composed of two vertical steel plates and a horizontal steel plate located between the two vertical steel plates, and the fixing groove is used to fix the prefabricated panel.

[0011] Furthermore, the diameter of the reserved hole is larger than the diameter of the grouting anchor rod.

[0012] Furthermore, there is a gap between the grouting anchor rod and the reserved hole, and the gap is blocked by a rubber plug or an anchoring agent.

[0013] Furthermore, a gasket and a nut are provided on the side of the grouting anchor rod close to the foundation pit, the gasket is attached to the outer side of the prefabricated panel, and the nut is attached to the outer side of the gasket.

[0014] Furthermore, the grouting anchor rods are inserted into the undisturbed foundation pit soil and grouting treatment is performed.

[0015] Furthermore, the fiberglass anchor rod is inserted into the soil within the range of the jacking pipe and grouting is performed.

[0016] Furthermore, the inner support portion includes a parallel inner support that is attached to the prefabricated pile and an inclined support that connects the parallel inner supports.

[0017] The utility model brings at least the following beneficial effects:

[0018] The utility model provides a foundation pit support structure for a jacking starting shaft, comprising: a plurality of precast piles, a plurality of precast panels, a crown beam and an inner support portion, wherein the plurality of precast piles are inserted along the foundation pit boundary to the bottom of the foundation pit, the plurality of precast panels are arranged along the depth direction of the foundation pit, and each of the precast panels is installed between two precast piles on the foundation pit wall on the jacking starting side, the crown beam is arranged at the top of the plurality of precast piles, and the precast piles inside the foundation pit are connected through the inner support portion; the precast panels are provided with reserved holes, and grouting anchor rods are inserted into the foundation pit soil through the reserved holes; the precast panels include a first precast panel and a second precast panel close to the jacking pipe, the first precast panel and the second precast panel are reserved with a jacking pipe outer contour, and a glass fiber anchor rod is inserted into the soil within the jacking pipe outer contour.

[0019] The foundation pit wall on one side of the jacking pipe adopts multiple prefabricated piles, multiple prefabricated panels, crown beams and internal supports, as well as corresponding grouting anchors and glass fiber anchors, which together form the foundation pit support structure of the jacking pipe starting well, which can avoid the destruction of the foundation pit support structure before the jacking pipe starts, and avoid the disturbance of the soil caused by the destruction construction. On the one hand, the grouting anchors and glass fiber anchors can improve the strength of the soil, and on the other hand, they connect the prefabricated panels and the undisturbed soil to form an overall support structure, which enhances the stability of the foundation pit support and ensures the construction safety of the foundation pit of the jacking pipe starting well. In addition, the operability of the present application is strong, and the convenience of the foundation pit support construction is improved by the support of prefabricated panels, the construction period is shortened, the construction efficiency is improved, and the construction cost is reduced.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A front view of a foundation pit support structure for a jacking launch well provided by an embodiment of the utility model;

[0023] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0024] Figure 3 A top view of the foundation pit support structure for the jacking starting well provided by an embodiment of the utility model;

[0025] Figure 4 A schematic diagram of the connection between a grouting anchor rod, a prefabricated plate component and a prefabricated pile component provided in an embodiment of the utility model.

[0026] icon:

[0027] 100-precast piles; 110-steel blocks; 120-vertical steel plates; 130-horizontal steel plates; 200-crown beams; 300-inner support parts; 310-parallel inner support; 320-diagonal braces; 400-precast panels; 410-first precast panel; 420-second precast panel; 430-outer contour of top pipe; 500-grouting anchor rods; 510-gaskets; 520-nuts; 600-fiberglass anchor rods. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the basic units of the International System of Units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] Embodiment 1

[0035] Precast piles are usually used as an important supporting structure for the foundation pit of the starting well. However, after the foundation pit construction is completed and before the jacking pipe is launched, the precast piles near the jacking pipe side will be broken. The breaking construction process will not only damage the foundation pit supporting structure, but also disturb the soil, increasing the risk of foundation pit instability. In addition, the breaking construction of precast piles will increase the construction cost and extend the construction period.

[0036] In view of this, the embodiment of the utility model provides a foundation pit support structure for a jacking starting well, comprising: a plurality of prefabricated piles 100, a plurality of prefabricated panels 400, a crown beam 200 and an inner support portion 300, wherein the plurality of prefabricated piles 100 are inserted to the bottom of the foundation pit along the foundation pit boundary, the plurality of prefabricated panels 400 are arranged along the depth direction of the foundation pit, and each prefabricated panel 400 is installed between two prefabricated piles 100 on the foundation pit wall on the starting side of the jacking pipe, and the crown beam 200 is arranged at the plurality of The top of the precast pile 100 and the precast pile 100 inside the foundation pit are connected through the inner support part 300; the precast panel 400 is provided with reserved holes, and the grouting anchor rod 500 is inserted into the foundation pit soil through the reserved holes; the precast panel 400 includes a first precast panel 410 and a second precast panel 420 close to the top pipe, and the first precast panel 410 and the second precast panel 420 are reserved with a top pipe outer contour 430, and the soil inside the top pipe outer contour 430 is inserted with a glass fiber anchor rod 600.

[0037] The foundation pit wall on one side of the jacking pipe adopts multiple prefabricated piles 100, multiple prefabricated panels 400, crown beams 200 and internal support parts 300, as well as corresponding grouting anchors 500 and glass fiber anchors 600, which together form the foundation pit support structure of the jacking pipe starting well, which can avoid the destruction of the foundation pit support structure before the jacking pipe starts, and avoid the disturbance of the soil caused by the destruction construction. On the one hand, the grouting anchors 500 and the glass fiber anchors 600 can improve the strength of the soil, and on the other hand, the prefabricated panels 400 and the undisturbed soil are connected to form an overall support structure, which enhances the stability of the foundation pit support and ensures the construction safety of the foundation pit of the jacking pipe starting well. In addition, the operability of the present application is strong, and the convenience of the foundation pit support construction is improved by the support of the prefabricated panels 400, which shortens the construction period, improves the construction efficiency, and reduces the construction cost.

[0038] In an optional manner of this embodiment, the width of the prefabricated panel 400 is greater than the diameter of the top pipe, and the height of the prefabricated panel 400 is the depth of each excavation of the foundation pit.

[0039] See also Figure 3 , Figure 3 The part extending upward is the top pipe, and the width of the prefabricated panel 400 is greater than the diameter of the top pipe, so that a foundation pit support structure is formed around the top pipe. Figure 1 Since the foundation pit needs to be excavated multiple times, the height of the prefabricated panel 400 is the depth of each excavation of the foundation pit.

[0040] In an optional manner of this embodiment, a steel block 110 is provided on one side where the prefabricated pile member 100 is connected to the prefabricated panel member 400, and the steel block 110 is used for welding the fixing groove.

[0041] Furthermore, the fixing groove is composed of two vertical steel plates 120 and a horizontal steel plate 130 located between the two vertical steel plates 120 , and the fixing groove is used to fix the prefabricated panel 400 .

[0042] See also Figure 2 The two vertical steel plates 120 and the one horizontal steel plate 130 together form a fixing groove, which can fix the prefabricated panel 400, so that the prefabricated panel 400 and the prefabricated pile 100 are effectively connected and fixed, thereby enhancing the stability of the foundation pit support structure of the jacking starting shaft.

[0043] In an optional manner of this embodiment, the diameter of the reserved hole is larger than the diameter of the grouting anchor rod 500 .

[0044] Furthermore, there is a gap between the grouting anchor rod 500 and the reserved hole, and the gap is blocked by a rubber plug or an anchoring agent.

[0045] See also Figure 4 There is a margin between the reserved hole and the grouting anchor rod 500, and there is a gap between the two. The gap can be blocked by a rubber plug or an anchoring agent, so that the grouting anchor rod 500 can be stably inserted into the foundation pit soil through the reserved hole.

[0046] In an optional manner of this embodiment, a gasket 510 and a nut 520 are provided on the side of the grouting anchor 500 close to the foundation pit. The gasket 510 is attached to the outer side of the prefabricated panel 400 , and the nut 520 is attached to the outer side of the gasket 510 .

[0047] See also Figure 4 In order to strengthen the connection effect between the grouting anchor rod 500 and the prefabricated panel 400, a gasket 510 and a nut 520 are arranged on the side of the grouting anchor rod 500 close to the foundation pit, so that the connection between the grouting anchor rod 500 and the prefabricated panel 400 is more stable, fastened and reliable.

[0048] In an optional manner of this embodiment, the grouting anchor rod 500 is inserted into the undisturbed foundation pit soil and subjected to grouting treatment, and the fiberglass anchor rod 600 is inserted into the soil within the range of the jacking pipe and subjected to grouting treatment.

[0049] See also Figure 1 and Figure 4 The grouting anchor rod 500 and the glass fiber anchor rod 600 are both inserted into the corresponding foundation pit soil and need to be grouting treated to ensure the stability of the foundation pit support structure.

[0050] In an optional manner of this embodiment, the inner support portion 300 includes a parallel inner support 310 attached to the prefabricated pile member 100 and a diagonal support 320 connecting the parallel inner support 310 .

[0051] See also Figure 3 The parallel inner supports 310 are arranged close to the prefabricated pile members 100 in the circumferential direction, and the diagonal supports 320 are connected between the parallel inner supports 310 on adjacent sides. The arrangement of the parallel inner supports 310 and the diagonal supports 320 strengthens the supporting effect of the inner support part 300 and strengthens the supporting stability of the foundation pit support structure of the jacking starting shaft.

[0052] The construction process of the foundation pit support structure of the jacking starting well of this embodiment is as follows:

[0053] First, locate and stake out multiple prefabricated piles 100 in the area to be constructed, insert and drive prefabricated piles 100 along the boundary of the foundation pit of the jacking starting shaft, and construct the crown beam 200 after the construction of the prefabricated piles 100 is completed. Then, excavate the soil in the foundation pit, install a prefabricated panel 400 for each excavated layer, and insert the grouting anchor rod 500 into the reserved hole after the installation of the prefabricated panel 400 is completed and grouting is performed. When the excavation reaches the middle of the foundation pit, the inner support part 300 is constructed, and when the excavation reaches the range of the jacking pipe, the first prefabricated panel 410 and the second prefabricated panel 420 are installed, and the fiberglass anchor rod 600 is inserted into the soil within the range of the jacking pipe, and finally the bottom of the foundation pit is constructed. After all the construction is completed, the prefabricated piles 100, the crown beam 200, the inner support part 300, the prefabricated panel 400, the grouting anchor rod 500 and the fiberglass anchor rod 600 form the foundation pit support structure of the jacking starting shaft.

[0054] In this embodiment, the prefabricated plate 400 replaces the prefabricated pile 100 on one side of the jacking pipe, thereby avoiding the risk of disturbing the soil or even collapse of the foundation pit caused by breaking the prefabricated pile 100 during the jacking pipe construction, ensuring construction safety and improving construction efficiency.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A foundation pit support structure for a jacking starting well, characterized in that: include: A plurality of prefabricated piles, a plurality of prefabricated panels, a crown beam and an inner support portion, wherein the plurality of prefabricated piles are inserted along the boundary of the foundation pit to the bottom of the foundation pit, the plurality of prefabricated panels are arranged along the depth direction of the foundation pit, and each of the prefabricated panels is installed between two prefabricated piles on the foundation pit wall on the starting side of the jacking pipe, the crown beam is arranged on the top of the plurality of prefabricated piles, and the prefabricated piles inside the foundation pit are connected by the inner support portion; The prefabricated plate is provided with a reserved hole, and the grouting anchor rod is inserted into the foundation pit soil through the reserved hole; The prefabricated panels include a first prefabricated panel and a second prefabricated panel close to the top pipe, the first prefabricated panel and the second prefabricated panel are pre-reserved with the outer contour of the top pipe, and the soil within the outer contour of the top pipe is inserted with glass fiber anchor rods.

2. The foundation pit support structure for the jacking starting well according to claim 1 is characterized in that: The width of the prefabricated panel is greater than the diameter of the top pipe, and the height of the prefabricated panel is the depth of each excavation of the foundation pit.

3. The foundation pit support structure for the jacking starting well according to claim 1 is characterized in that: A steel block is provided on one side where the prefabricated pile is connected to the prefabricated plate, and the steel block is used for welding a fixing groove.

4. The foundation pit support structure for the jacking starting well according to claim 3 is characterized in that: The fixing groove is composed of two vertical steel plates and a horizontal steel plate located between the two vertical steel plates, and the fixing groove is used to fix the prefabricated panel.

5. The foundation pit support structure for the jacking starting well according to claim 1 is characterized in that: The diameter of the reserved hole is larger than the diameter of the grouting anchor rod.

6. The foundation pit support structure for the jacking starting well according to claim 5 is characterized in that: There is a gap between the grouting anchor rod and the reserved hole, and the gap is blocked by a rubber plug or an anchoring agent.

7. The foundation pit support structure for the jacking starting well according to claim 1 is characterized in that: The grouting anchor rod is provided with a gasket and a nut on one side close to the foundation pit. The gasket is attached to the outer side of the prefabricated panel, and the nut is attached to the outer side of the gasket.

8. The foundation pit support structure for the jacking starting well according to claim 7 is characterized in that: The grouting anchor rod is inserted into the undisturbed foundation pit soil and grouting treatment is performed.

9. The foundation pit support structure for the jacking starting well according to claim 1, characterized in that: The glass fiber anchor rod is inserted into the soil within the range of the jacking pipe and grouting treatment is performed.

10. The foundation pit support structure for the jacking starting well according to claim 1, characterized in that: The inner support portion includes a parallel inner support that is attached to the prefabricated pile member and an inclined support that connects the parallel inner supports.

Images