Prefabricated assembly type secondary bottom plate and cable pipe-jacking tunnel working well applying same

Abstract

The utility model relates to a prefabricated assembly type secondary bottom plate and a cable pipe-jacking tunnel working well using the prefabricated assembly type secondary bottom plate. The cable pipe-jacking tunnel working well comprises the prefabricated assembly type secondary bottom plate. The prefabricated assembly type secondary bottom plate comprises a plurality of prefabricated buttresses, a plurality of prefabricated main beams and a plurality of prefabricated panel beams which are divided into a plurality of groups, and each group of prefabricated buttresses are arranged in the row direction and arranged on an inner bottom plate of the cable pipe-jacking tunnel working well. The prefabricated main beams correspond to the prefabricated buttresses in a one-to-one mode, the prefabricated main beams extend in the row direction to be arranged on the prefabricated buttresses in the corresponding sets, the prefabricated panel beams extend in the column direction to be arranged on the prefabricated main beams, and each prefabricated panel beam comprises at least one short beam with the length smaller than the width of the cable working well in the column direction. And a sump capable of accommodating a drainage facility is formed outside the end part of the short beam. The utility model can meet the functional requirements, simplify the process flow, reduce the construction difficulty and improve the engineering quality.

Description

Technical Field

[0001] This utility model relates to the field of power engineering or municipal engineering technology, specifically to a prefabricated assembled secondary base plate and a cable jacking tunnel manhole using the same. Background Technology

[0002] Pipe jacking is widely used in the construction of urban underground pipelines and utility tunnels. According to the requirements of pipe jacking construction technology, a working shaft (including a launching shaft and a receiving shaft) needs to be installed at regular intervals or at bends in the tunnel. Simultaneously, the launching or receiving shafts are generally located at local low points in the tunnel, serving as collection points for leaking groundwater, which is then centrally discharged. When pipe jacking is used in cable tunnel projects, it must meet the requirements for cable operation, and its drainage standards must be appropriately increased.

[0003] In existing cable jacking shafts, a sump is installed on the bottom slab during the starting or receiving phases, or a layer of plain concrete is poured on top of the bottom slab, with sump wells of varying sizes installed on this concrete layer to meet the needs of collecting and draining leaking water from the tunnel. For jacking pipelines, after the jacking construction is completed, a leveling concrete layer needs to be laid at the bottom of the jacking pipe to allow personnel to pass through. Therefore, there is a certain height difference between the leveling layer and the bottom slab of the working shaft. This height difference is usually achieved by setting up several steps to connect the passageway inside the shaft and the jacking pipe.

[0004] On the one hand, existing cable jacking projects need to meet the requirements of secondary waterproofing. When the groundwater level is high, setting up a sump under the base slab requires not only deepening the excavation depth locally, but also secondary pouring of the sump and base slab, and the sump becoming a leakage point. On the other hand, when no plain concrete layer is added above the base slab, there is a height difference between the jacking pipe and the top of the slab. In addition, if problems such as pump failure occur, water accumulation and siltation at the bottom of the sump can easily lead to maintenance difficulties. While setting up a plain concrete layer of more than 800mm at the bottom of the cable jacking pipe and setting up sumps in some parts of the concrete layer can avoid the height difference between the sump and the jacking pipe, the leakage problems and construction difficulties caused by the sump construction under the base slab, there are still problems such as large concrete consumption (often exceeding several hundred cubic meters), long construction period, and large carbon emissions. Summary of the Invention

[0005] The technical problem solved by this utility model is to provide a prefabricated secondary bottom plate suitable for cable jacking tunnel shafts, which solves the drainage problem, solves the height difference problem between the jacking pipe and the shaft bottom plate, and reduces the construction difficulty.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A prefabricated assembled secondary base slab is installed inside a cable jacking tunnel shaft. Cable jacking pipe sections pass laterally through the lower part of the shaft wall. The prefabricated assembled secondary base slab includes multiple prefabricated supports, multiple prefabricated main beams, and multiple prefabricated panel beams, divided into multiple groups. Each group of prefabricated supports is arranged along a row direction and installed on the inner base slab of the cable jacking tunnel shaft. Each prefabricated main beam corresponds one-to-one with each group of prefabricated supports and extends along the row direction onto the corresponding group of prefabricated supports. Each prefabricated panel beam extends along a column direction onto each of the prefabricated main beams. Each prefabricated panel beam includes at least one short beam whose length is shorter than the width of the cable jacking tunnel shaft in the column direction. A sump for accommodating drainage facilities is formed at the end of the short beam.

[0008] Preferably, the precast supports in each group are evenly distributed.

[0009] In a preferred embodiment of this utility model, the width of the support surface on the precast pier for supporting the precast main beam in the column direction is greater than the width of the precast main beam in the column direction.

[0010] In a preferred embodiment of this utility model, the precast support pier and the precast main beam, as well as the precast main beam and the precast panel beam, are all connected by welding with pre-embedded steel plates.

[0011] Furthermore, the precast panel beam also includes multiple long beams that are longer than the short beams, and the ends of the long beams form an installation gap with the inner wall of the tunnel shaft.

[0012] Preferably, an assembly gap is formed between adjacent prefabricated panel beams.

[0013] Typically, the upper surface of the precast panel beam is lower than the upper surface of the leveling concrete layer inside the cable jacking pipe section.

[0014] Preferably, the cross-section of the precast support is rectangular, and the longitudinal sections of the precast main beam and the precast panel beam are both rectangular.

[0015] Preferably, the row direction is parallel to the axial direction of the cable jacking pipe section.

[0016] In another aspect, this utility model provides a cable jacking tunnel manhole, which includes the aforementioned prefabricated assembled secondary base plate.

[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: this utility model can meet functional requirements, simplify the process flow, reduce construction difficulty, and improve project quality. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the cable jacking tunnel manhole of this utility model.

[0019] Appendix Figure 2 This is a schematic diagram showing the arrangement of prefabricated supports for the prefabricated secondary bottom slab in the cable jacking tunnel shaft of this utility model.

[0020] Appendix Figure 3 This is a schematic diagram showing the arrangement of the precast main beams of the precast assembled secondary bottom slab in the cable jacking tunnel shaft of this utility model.

[0021] Appendix Figure 4 This is a schematic diagram showing the arrangement of precast panel beams in the precast assembled secondary bottom slab of the cable jacking tunnel shaft according to this utility model.

[0022] In the attached diagrams: 1. Well wall; 2. Cable jacking pipe section; 4. Leveling concrete layer; 5. Precast support; 6. Precast main beam; 7. Precast panel beam; 9. Sump. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0024] Example 1: As shown in the attached document Figure 1 To be continued Figure 4 As shown, a cable jacking tunnel manhole includes a longitudinally arranged manhole wall 1 and a manhole bottom plate disposed at the bottom of the manhole wall 1. The cable jacking pipe section 2 passes through the manhole wall 1 laterally at the lower part of the manhole wall 1, and the bottom of the cable jacking pipe section 2 has a leveling concrete layer 4.

[0025] The cable jacking tunnel shaft also includes a precast secondary base slab installed on the shaft floor. This precast secondary base slab comprises multiple precast supports 5, multiple precast main beams 6, and multiple precast panel beams 7. Therefore, from bottom to top, it consists of a bottom layer composed of precast supports 5, a middle layer composed of precast main beams 6, and a top layer composed of precast panel beams 7. The heights of the precast supports 5, precast main beams 6, and precast panel beams 7 can be customized based on the height of the leveling concrete layer 4 at the bottom of the cable jacking pipe section 2 from the shaft floor slab (typically 0.8m to 1.2m). Typically, the heights of the precast supports 5 are 0.25m for the precast panel beams 7, 0.35m for the precast main beams 6, and the remaining 0.2m to 0.6m. Typically, the upper surface of the precast panel beams 7 is slightly lower than, equal to, and higher than, the upper surface of the leveling concrete layer 4 inside the cable jacking pipe section 2. If necessary, the precast panel beams 7 can be higher than the leveling concrete layer 4 of the jacking pipe.

[0026] Multiple precast supports 5 are divided into multiple groups, and the number of groups of precast supports 5 is the same as the number of precast main beams 6. Therefore, each precast main beam 6 corresponds one-to-one with each group of precast supports 5. Each group of precast supports 5 includes multiple precast supports 5. Each precast support 5 is erected longitudinally on the bottom slab of the well, and each group of precast supports 5 is arranged along the row direction and evenly distributed. Here, the row direction is parallel to the axis of the cable jacking pipe section. In this embodiment, a total of 12 precast supports 5 are set, divided into four groups, each group including 3 precast supports 5 arranged along the row direction. The cross-section of the precast supports 5 is rectangular. In this embodiment, a 0.6m × 0.6m positive cross-section precast supports 5 can be used.

[0027] Each precast main beam 6 is mounted on a corresponding set of precast supports 5, and the precast main beam 6 extends along the row direction. The width of the support surface on the precast support 5 for supporting the precast main beam 6 in the column direction is greater than the width of the precast main beam 6 in the column direction. Typically, the difference between these two widths can be 0.20m to meet the positioning and fixing requirements of the precast main beam 6. The longitudinal section of the precast main beam 6 is rectangular.

[0028] Precast panel beams 7 extend along the column direction and are installed on each precast main beam 6. The number of precast panel beams 7 is relatively large, creating an effect similar to a full-coverage cable jacking tunnel manhole. The longitudinal section of the precast panel beams 7 is also rectangular. Each precast panel beam 7 includes at least one short beam, the length of which is shorter than the width of the cable jacking tunnel manhole in the column direction, thus forming a sump 9 at the end of the short beam to accommodate drainage facilities (such as submersible pumps and external drainage pipes). The precast panel beams 7 also include multiple long beams longer than the short beams, the length of which is close to the width of the cable jacking tunnel manhole in the column direction, thus forming a narrow installation gap between the end of the long beam and the inner wall of the tunnel manhole. Simultaneously, a small assembly gap is formed between parallel adjacent precast panel beams 7. The width of a single precast panel beam 7 can be 0.4m, and the gap between beams can be 0.10m to meet the error requirements during full-coverage construction.

[0029] In the above scheme, the nodes between the precast support 5 and the precast main beam 6, and between the precast main beam 6 and the precast panel beam 7, are all connected by pre-embedded steel plates and then welded on site. The precast assembled base plate structure is an integral structure, and the on-site welds are connected by welding.

[0030] The present invention has the following advantages:

[0031] 1. The well bottom plate and its sump 9 of the power pipe jacking project adopt a prefabricated assembly structure, which makes full use of the advantages of the prefabricated assembly structure such as high standardization and short on-site operation time.

[0032] 2. A secondary base plate is constructed above the foundation slab of the manhole as the inner bottom layer to meet the functional requirements of personnel passage and water collection pit 9, thereby avoiding the construction of a groove-shaped water collection pit 9 on the cast-in-place base slab, simplifying the process, reducing construction difficulty, and improving the quality of the project.

[0033] 3. The prefabricated assembled components are connected by welding, which ensures the overall rigidity of the base plate structure;

[0034] 4. The structural system of precast piers 5, precast main beams 6, and precast panel beams 7 greatly increases the water storage capacity of the bottom slab, avoids repeated starting of the submersible sewage pump, and extends the service life of the submersible sewage pump.

[0035] 5. The prefabricated structure facilitates later maintenance and adjustment.

[0036] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A prefabricated secondary floor arranged in a cable conduit tunnel shaft, a cable conduit pipe section transversely passing through a shaft wall of the cable conduit tunnel shaft below a lower part of the shaft wall, characterized in that: The prefabricated assembly type secondary floor comprises a plurality of prefabricated support piers, a plurality of prefabricated main beams and a plurality of prefabricated panel beams, each group of the prefabricated support piers is arranged along a row direction and is arranged on an inner bottom plate of a cable pipe jacking tunnel shaft, the prefabricated main beams correspond to each group of the prefabricated support piers one by one, and the prefabricated main beams are arranged on the corresponding group of the prefabricated support piers along the row direction, the prefabricated panel beams are arranged on each of the prefabricated main beams along a column direction, the prefabricated panel beams comprise at least one short beam with a length shorter than a width of the cable pipe jacking tunnel shaft in the column direction, and a sump capable of accommodating drainage facilities is formed outside end portions of the short beam.

2. The prefabricated assembly secondary floor according to claim 1, characterized in that: The plurality of prefabricated support piers in each group of the prefabricated support piers are uniformly distributed.

3. The prefabricated assembly secondary floor according to claim 1, characterized in that: A supporting surface of the prefabricated support pier for supporting the prefabricated main beam has a width greater than a width of the prefabricated main beam in the column direction.

4. The prefabricated assembly secondary floor according to claim 1, characterized in that: The prefabricated support piers and the prefabricated main beams, and the prefabricated main beams and the prefabricated panel beams are connected by embedded steel plates.

5. The prefabricated assembly secondary floor according to claim 1, characterized in that: The prefabricated panel beams further comprise a plurality of long beams with a length longer than the short beam, and an installation gap is formed between end portions of the long beams and inner walls of the tunnel shaft.

6. The prefabricated assembly secondary floor according to claim 1, characterized in that: An assembly gap is formed between adjacent prefabricated panel beams.

7. The prefabricated assembly secondary floor according to claim 1, characterized in that: An upper surface of the prefabricated panel beam is lower than an upper surface of a leveling concrete layer in the cable pipe joint.

8. The prefabricated assembly secondary floor according to claim 1, characterized in that: Cross sections of the prefabricated support piers are rectangular, and longitudinal sections of the prefabricated main beams and the prefabricated panel beams are rectangular.

9. The prefabricated assembly secondary floor according to claim 1, characterized in that: The row direction is parallel to an axial direction of the cable pipe joint.

10. An electrical cable ducting tunnel shaft characterised in that: The cable pipe jacking tunnel shaft comprises the prefabricated assembly type secondary floor according to any one of claims 1 to 9.

Images