KR20020063032A - Precast invert of sewerage manhole capable of controlling connection angle and length - Google Patents

Abstract

PURPOSE: A sewer manhole precast invert is provided to improve construction efficiency and to reduce the time and manpower required for construction. CONSTITUTION: The sewer manhole precast invert whose connection angle and length are adjustable according to field conditions, as a precast invert for setting up newly or settling a precast invert(6) to the existing manhole to construct the optimum invert to a sewer manhole, is made with rubber or resins to adapt to a construction field to set to the connecting form of an inflow pipe(2) and an outflow pipe(3) and contains an elastic horizontal iron core to prevent sectional transformation by horizontal pressure, a plastic vertical iron core attached longitudinally to keep a control angle when fixing a precast invert, a protective film attached into the invert to prevent a rise of the illumination factor by pollution of the invert when placing concrete around the precast invert(6), and a fixed pin(13) to attach invert concrete and the precast invert(6).

Description

Precast invert of sewerage manhole capable of controlling connection angle and length}

The present invention is that when the sewage flowed into the sewer manhole through the upstream sewage pipe is introduced into the sewer manhole, and the solids in the sewage are deposited inside the manhole due to the decrease in the flow rate due to the enlargement of the cross section inside the sewage manhole, It is related to the installation method of the invert (Invert) installed in the sewage manhole to prevent this, because the worker is very uncomfortable when the work for maintenance and sewage does not flow smoothly, the precipitated solids cause odor.

The inverts have the same diameter and inclination of the downstream conduits, and the footsteps of the inverts have a cross slope of 10 to 20%. The width of the invert extends the width of the downstream side to the same upstream, and the level of the upstream pipe and the bottom of the invert is secured to about 3 to 10 cm.

As illustrated in FIGS. 1 and 2, a typical manhole consists of a main body 1, an inlet pipe 2, and an outlet pipe 3, where a sewer manhole is downstream of an upstream inlet pipe 2. The inverter 4 is installed in order to keep the flow rate of the sewage between the side outlet pipes 3 to be the same to prevent solid decay and odor due to precipitation of the solids.

A typical invert installation method is to form a mold in the shape of a half-section of the tube to form an invert (4) from the bare concrete (5) and then install it with a mortar finish (4). However, this technique is excessively expensive and time-consuming to form a circular formwork, and the mortar finish (4) is not integral with the sphere, so it is easily peeled off and consequently increases the roughness coefficient, thereby damaging the original function of the invert. give.

In addition, it is very difficult to manufacture semi-circular formwork, and it is difficult to control quality in the field because wooden formwork is weak in buoyancy and requires a lot of manpower and time to finish mortar, and it causes air delay and increase of manhole construction cost. Has been.

The present invention is to produce a semi-circular formwork and the construction complexity and the construction cost and air requirements, the difficulty of quality control, the semi-tubular formwork in the factory according to the specifications of the inverted body in the factory, 1 and 2 After forming the manhole body 1 and the outflow pipes 2 and 3 in the figure, the invert body 6 is mounted, and then the remaining portion 5 is formed by the rootless concrete to complete.

The outflow pipes of sewage pipe manholes are not always straight as in the top and bottom views of Figs. 1 and 2, but they form various angles depending on the site. When using rigid materials such as concrete or metal, which are not plastic or elastic, Since it is difficult to provide a ready-made product, the inverted pipe can be freely given the angle of outflow pipe in a range that does not change the shape of the cross-sectional area in the field by using rubber or resin system as the material of the inverted body. Provide construction methods.

Invert construction method by formwork has to remove formwork after curing concrete, and it is cumbersome to finish mortar finish in order to have roughness coefficient equal to or higher than that of outflow pipes (2, 3). By providing a precast invert to be mounted, eliminating the mold installation and removal process and the mortar finishing process in the existing manhole installation process, the construction quality is improved, and the sewerage can greatly reduce the time and manpower requirements in the construction process. Provides manhole invert construction method.

1 is a plan view of the invert installation of the existing manhole

2 is a cross-sectional view of the invert installation of the existing manhole

Figure 3 shows a precast invert installation section of the new manhole

4 is a precast invert of the present invention

Figure 5 is a precast inverted connection angle adjustment function of the present invention

Figure 6 is a cross-sectional structure of the outer surface of the precast inverted in accordance with the present invention and the invert fixing pin installation

Figure 7 is an elastic transverse core installation to prevent the cross-sectional deformation caused by the transverse pressure with the precast inverted in the present invention

Figure 8 is a plastic longitudinal core installation for free connection angle control with a precast invert to the present invention

9 is a protective film mounting that can maintain the roughness coefficient of the inner surface of the invert well by removing after construction as a precast invert in the present invention

Figure 10 is a new manhole installation diagram of the precast invert to the present invention

Figure 11 is a conventional manhole installation of the precast invert in the present invention

** Description of symbols for the main parts of the drawing **

1: manhole body

2: inlet pipe

3: outflow pipe

4: Invert mortar finish

5: inverted plain concrete

6: precast invert

7: External waveform cross section of precast invert

8: high elastic transverse core

9: invert inner protective film

10: Firing bell core

11: inverter height adjustment foot

12: Sewage and sludge in the existing manhole

13: inverting retaining pin

In order to achieve the above object, the precast invert is an invert 6 having a very good cross section with a roughness coefficient through which the sewage flows smoothly, as shown in FIGS. 3 and 4, and the invert body 6 has an angle. If the adjustment of the need to adjust the angle according to the site as shown in Figure 5, the material can be cut in the field as well as the angle can be adjusted in the field.

As shown in FIG. 6, when selecting an invert for a large diameter tube or a material in which the angle is not easily adjusted, the external cross section is used as the corrugated cross section 7 to facilitate the adjustment of the angle as well as to prevent deformation in the lateral direction. There is no change in the area of induction means, and if necessary, the highly elastic transverse iron core 8 is mounted in the direction perpendicular to the longitudinal direction so that there is no change of the inverted cross section during transportation, site mounting, and concrete pouring.

As shown in FIG. 7, precast inverts made of rubber and hydraulic material and inverted concrete made of concrete may not be firmly mounted as a release material, and detachment may occur due to material separation, but may be released due to the weight and specific gravity of the precast invert itself. This is very unlikely, and inverting pins in the direction of bare concrete inside the precast invert immediately after casting the bare concrete (5) to securely mount the precast invert (6) and inverted concrete (5) in case of emergency. Pass it through (13) to fix it.

In FIG. 8, when the connection angle of the inlet and outlet pipes is not a manufactured angle at the site, it is difficult to maintain the adjustment angle after adjusting the connection angle in advance outside the manhole. In this case, the plastic material is good by mounting in the longitudinal direction of the precast invert, but the material capable of overcoming the elasticity of the invert body enables maximum angle control in the field.

In addition, in FIG. 9, the inverted inner protective film 9 is mounted on the manhole after precast inverting, so that the inner surface of the invert may be contaminated by cement or the like when concrete is poured. This protection film 9 can be removed before the water is passed after the completion of the curing or after the curing of the concrete, so that the inner surface of the invert can be best maintained.

FIG. 10 shows the method of mounting the precast invert on the new manhole. As shown in the work procedure (1), the rootless concrete (5) is unfolded inside the manhole, and then the precast invert (6) is pressed or moved. The precast invert (6) is fitted to the bottom of the upstream inlet (2) and the downstream outlet (3). After filling the remaining space with plain concrete (5), the invert fixing pin 13 is mounted and the protective film 9 is removed to finish the construction.

FIG. 11 shows a method of mounting the precast invert to the existing manhole, and when the invert is installed while the sludge and sewage are accumulated in the manhole in the existing manhole where sewage flows, as in the work procedure (1). As in step (2), the precast invert (6) is mounted on the upstream inlet pipe (2) and the downstream outlet pipe (3) with bricks, wood pieces, etc. (11), and then the work flow step (3). The sludge and sewage (12) outside the precast invert are discharged through the mounted precast invert and the downstream outlet pipe (3) and then the precast invert (6) mounted as in the work procedure (4). ) Finish the construction by filling the rootless concrete (5) on the outside and immediately after forming the manhole invert, attaching the invert fixing pin (13) and removing the protective film (9).

The sewage manhole invert construction method by the present invention precast invert has the following effects as compared to the prior art.

First, the sewage manhole invert construction method by the precast invert of the present invention does not require a circular formwork and installation and dismantling process that requires skilled woodworking technicians, thereby greatly reducing manpower and cost.

Second, unlike the conventional construction method, it does not require mortar finish after curing concrete, so manpower can be reduced. In the conventional construction method, mortar finishing can be done after curing period (28 days) after invert concrete is placed. However, the precast invert can dramatically reduce air due to the installation of the main body itself and the construction of concrete after finishing the construction.

Third, the invert construction method by the formwork is very difficult to form the formwork if the inlet and outlet pipes are not straight, and once manufactured, there is a disadvantage that must be discarded after one company, in this case as a rigid material such as concrete and metal Since the precast invert has to be made in each case form, the reality and the economics are greatly reduced. However, the precast invert of the present invention can remarkably improve the above disadvantage.

Fourth, the finish of the inner surface of the invert due to the mortar may be peeled off by the flow of sewage after passing through the water, or may be eroded by hydrogen sulfide and sulfuric acid generated in the sewage. The precast invert of the present invention does not have to be peeled off, and by selecting a rubber or resin-based material resistant to corrosion, it is possible to permanently maintain a good inner edge of the invert permanently.

Fifth, the invert construction method by formwork has a difficulty to block or turn the sewage to form an invert in the existing sewer manhole, but the precast invert of the present invention does not block or hinder the flow of sewage, Easy and simple application to existing manholes.

Claims (3)

As a precast invert for mounting a new or existing manhole with a precast invert 6 for constructing an optimal invert in the sewer manhole; The material of the precast invert is made of rubber or resin system so that the site can be adapted to the connection type of the inlet pipe (2) and the outlet pipe (3), which may appear in various places on the site, and can be cut on the site. Precast invert device that can adjust the length and angle according to the site situation The precast invert of the above paragraph 1 has a corrugated structure (7) on the outside of the invert in preparation for difficult connection angle adjustment such as medium and large diameter pipes, and facilitates angle adjustment and prevents the change of the invert cross section due to lateral pressure. Precast invert can be securely fixed to the invert rootless concrete and the precast invert by the invert fixing pin The precast inverter according to claim 1, characterized in that the high elastic transverse iron core 8 is mounted so as to be perpendicular to the longitudinal direction when it is necessary to prevent the change of the cross section by transverse pressure, such as during transportation and concrete placing; A precast invert equipped with a longitudinal iron core 10 having strong plasticity in the longitudinal direction in order to maintain an adjustment angle when the precast invert is mounted; Precast invert equipped with protective film 9 on the inner surface of the invert to prevent the roughness coefficient from being contaminated by cement etc. in the process of pouring concrete (5) outside the precast invert (6).